Use custom dependency resolution

- Use Apache Ivy to resolve artifact URLs
- Update build model with full artifact IDs
- Generate Maven module metadata to support dynamic version constraints
- Resolve snapshot versions and generate snapshot metadata
- Add test fixtures and rewrite Gradle plugin tests
- Update dependencies

app/build.gradle.kts

@@ -6,9 +6,6 @@ plugins {
     application
 }
 
-group = "org.nixos"
-version = "1.0.0-SNAPSHOT"
-
 dependencies {
     implementation(project(":model"))
     implementation(kotlin("stdlib-jdk8"))

app/gradle/dependency-locks/compileClasspath.lockfile

@@ -1,16 +1,16 @@
 # This is a Gradle generated file for dependency locking.
 # Manual edits can break the build and are not advised.
 # This file is expected to be part of source control.
-com.github.ajalt:clikt:2.2.0
+com.github.ajalt:clikt:2.3.0
-com.squareup.moshi:moshi-adapters:1.9.1
+com.squareup.moshi:moshi-adapters:1.9.2
-com.squareup.moshi:moshi-kotlin:1.9.1
+com.squareup.moshi:moshi-kotlin:1.9.2
-com.squareup.moshi:moshi:1.9.1
+com.squareup.moshi:moshi:1.9.2
-com.squareup.okio:okio:2.4.1
+com.squareup.okio:okio:2.4.3
-org.gradle:gradle-tooling-api:5.6.3
+org.gradle:gradle-tooling-api:6.1
-org.jetbrains.kotlin:kotlin-reflect:1.3.50
+org.jetbrains.kotlin:kotlin-reflect:1.3.61
-org.jetbrains.kotlin:kotlin-stdlib-common:1.3.50
+org.jetbrains.kotlin:kotlin-stdlib-common:1.3.61
-org.jetbrains.kotlin:kotlin-stdlib-jdk7:1.3.41
+org.jetbrains.kotlin:kotlin-stdlib-jdk7:1.3.61
-org.jetbrains.kotlin:kotlin-stdlib-jdk8:1.3.41
+org.jetbrains.kotlin:kotlin-stdlib-jdk8:1.3.61
-org.jetbrains.kotlin:kotlin-stdlib:1.3.50
+org.jetbrains.kotlin:kotlin-stdlib:1.3.61
 org.jetbrains:annotations:13.0
 org.slf4j:slf4j-api:2.0.0-alpha1

app/gradle/dependency-locks/runtimeClasspath.lockfile

@@ -1,17 +1,18 @@
 # This is a Gradle generated file for dependency locking.
 # Manual edits can break the build and are not advised.
 # This file is expected to be part of source control.
-com.github.ajalt:clikt:2.2.0
+com.github.ajalt:clikt:2.3.0
-com.squareup.moshi:moshi-adapters:1.9.1
+com.squareup.moshi:moshi-adapters:1.9.2
-com.squareup.moshi:moshi-kotlin:1.9.1
+com.squareup.moshi:moshi-kotlin:1.9.2
-com.squareup.moshi:moshi:1.9.1
+com.squareup.moshi:moshi:1.9.2
-com.squareup.okio:okio:2.4.1
+com.squareup.okio:okio:2.4.3
-org.gradle:gradle-tooling-api:5.6.3
+net.swiftzer.semver:semver:1.1.1
-org.jetbrains.kotlin:kotlin-reflect:1.3.50
+org.gradle:gradle-tooling-api:6.1
-org.jetbrains.kotlin:kotlin-stdlib-common:1.3.50
+org.jetbrains.kotlin:kotlin-reflect:1.3.61
-org.jetbrains.kotlin:kotlin-stdlib-jdk7:1.3.41
+org.jetbrains.kotlin:kotlin-stdlib-common:1.3.61
-org.jetbrains.kotlin:kotlin-stdlib-jdk8:1.3.41
+org.jetbrains.kotlin:kotlin-stdlib-jdk7:1.3.61
-org.jetbrains.kotlin:kotlin-stdlib:1.3.50
+org.jetbrains.kotlin:kotlin-stdlib-jdk8:1.3.61
+org.jetbrains.kotlin:kotlin-stdlib:1.3.61
 org.jetbrains:annotations:13.0
 org.slf4j:slf4j-api:2.0.0-alpha1
 org.slf4j:slf4j-simple:2.0.0-alpha1

app/gradle/dependency-locks/testCompileClasspath.lockfile

@@ -1,16 +1,16 @@
 # This is a Gradle generated file for dependency locking.
 # Manual edits can break the build and are not advised.
 # This file is expected to be part of source control.
-com.github.ajalt:clikt:2.2.0
+com.github.ajalt:clikt:2.3.0
-com.squareup.moshi:moshi-adapters:1.9.1
+com.squareup.moshi:moshi-adapters:1.9.2
-com.squareup.moshi:moshi-kotlin:1.9.1
+com.squareup.moshi:moshi-kotlin:1.9.2
-com.squareup.moshi:moshi:1.9.1
+com.squareup.moshi:moshi:1.9.2
-com.squareup.okio:okio:2.4.1
+com.squareup.okio:okio:2.4.3
-org.gradle:gradle-tooling-api:5.6.3
+org.gradle:gradle-tooling-api:6.1
-org.jetbrains.kotlin:kotlin-reflect:1.3.50
+org.jetbrains.kotlin:kotlin-reflect:1.3.61
-org.jetbrains.kotlin:kotlin-stdlib-common:1.3.50
+org.jetbrains.kotlin:kotlin-stdlib-common:1.3.61
-org.jetbrains.kotlin:kotlin-stdlib-jdk7:1.3.41
+org.jetbrains.kotlin:kotlin-stdlib-jdk7:1.3.61
-org.jetbrains.kotlin:kotlin-stdlib-jdk8:1.3.41
+org.jetbrains.kotlin:kotlin-stdlib-jdk8:1.3.61
-org.jetbrains.kotlin:kotlin-stdlib:1.3.50
+org.jetbrains.kotlin:kotlin-stdlib:1.3.61
 org.jetbrains:annotations:13.0
 org.slf4j:slf4j-api:2.0.0-alpha1

app/gradle/dependency-locks/testRuntimeClasspath.lockfile

@@ -1,17 +1,18 @@
 # This is a Gradle generated file for dependency locking.
 # Manual edits can break the build and are not advised.
 # This file is expected to be part of source control.
-com.github.ajalt:clikt:2.2.0
+com.github.ajalt:clikt:2.3.0
-com.squareup.moshi:moshi-adapters:1.9.1
+com.squareup.moshi:moshi-adapters:1.9.2
-com.squareup.moshi:moshi-kotlin:1.9.1
+com.squareup.moshi:moshi-kotlin:1.9.2
-com.squareup.moshi:moshi:1.9.1
+com.squareup.moshi:moshi:1.9.2
-com.squareup.okio:okio:2.4.1
+com.squareup.okio:okio:2.4.3
-org.gradle:gradle-tooling-api:5.6.3
+net.swiftzer.semver:semver:1.1.1
-org.jetbrains.kotlin:kotlin-reflect:1.3.50
+org.gradle:gradle-tooling-api:6.1
-org.jetbrains.kotlin:kotlin-stdlib-common:1.3.50
+org.jetbrains.kotlin:kotlin-reflect:1.3.61
-org.jetbrains.kotlin:kotlin-stdlib-jdk7:1.3.41
+org.jetbrains.kotlin:kotlin-stdlib-common:1.3.61
-org.jetbrains.kotlin:kotlin-stdlib-jdk8:1.3.41
+org.jetbrains.kotlin:kotlin-stdlib-jdk7:1.3.61
-org.jetbrains.kotlin:kotlin-stdlib:1.3.50
+org.jetbrains.kotlin:kotlin-stdlib-jdk8:1.3.61
+org.jetbrains.kotlin:kotlin-stdlib:1.3.61
 org.jetbrains:annotations:13.0
 org.slf4j:slf4j-api:2.0.0-alpha1
 org.slf4j:slf4j-simple:2.0.0-alpha1

app/src/dist/share/gradle-env.nix

@@ -19,7 +19,7 @@
 #         '';
 #       }
 
-{ stdenv, lib, buildEnv, fetchurl, gradleGen, writeText }:
+{ stdenv, buildEnv, fetchurl, gradleGen, writeText, writeTextDir }:
 
 { envSpec
 , pname ? null
@@ -27,9 +27,18 @@
 , enableParallelBuilding ? true
 , gradleFlags ? [ "build" ]
 , gradlePackage ? null
+, enableDebug ? false
 , ... } @ args:
 
 let
+  inherit (builtins)
+    filter sort replaceStrings attrValues match fromJSON
+    concatStringsSep;
+
+  inherit (stdenv.lib)
+    versionOlder unique mapAttrs last concatMapStringsSep removeSuffix
+    optionalString groupBy' readFile hasSuffix;
+
   mkDep = depSpec: stdenv.mkDerivation {
     inherit (depSpec) name;
 
@@ -41,40 +50,171 @@ let
 
     installPhase = ''
       mkdir -p $out/${depSpec.path}
-      ln -s $src $out/${depSpec.path}/${depSpec.filename}
+      ln -s $src $out/${depSpec.path}/${depSpec.name}
     '';
   };
 
+  mkModuleMetadata = deps:
+    let
+      ids = filter
+        (id: id.type == "pom")
+        (map (dep: dep.id) deps);
+
+      modules = groupBy'
+        (meta: id:
+          let
+            isNewer = versionOlder meta.latest id.version;
+            isNewerRelease =
+              !(hasSuffix "-SNAPSHOT" id.version) &&
+              versionOlder meta.release id.version;
+          in {
+            groupId = id.group;
+            artifactId = id.name;
+            latest = if isNewer then id.version else meta.latest;
+            release = if isNewerRelease then id.version else meta.release;
+            versions = meta.versions ++ [id.version];
+          }
+        )
+        {
+          latest = "";
+          release = "";
+          versions = [];
+        }
+        (id: "${replaceStrings ["."] ["/"] id.group}/${id.name}/maven-metadata.xml")
+        ids;
+
+    in
+      attrValues (mapAttrs (path: meta:
+        let
+          versions' = sort versionOlder (unique meta.versions);
+        in
+          with meta; writeTextDir path ''
+            <?xml version="1.0" encoding="UTF-8"?>
+            <metadata modelVersion="1.1">
+              <groupId>${groupId}</groupId>
+              <artifactId>${artifactId}</artifactId>
+              <versioning>
+                ${optionalString (latest != "") "<latest>${latest}</latest>"}
+                ${optionalString (release != "") "<release>${release}</release>"}
+                <versions>
+                  ${concatMapStringsSep "\n    " (v: "<version>${v}</version>") versions'}
+                </versions>
+              </versioning>
+            </metadata>
+          ''
+      ) modules);
+
+  mkSnapshotMetadata = deps:
+    let
+      snapshotDeps = filter (dep: dep ? build && dep ? timestamp) deps;
+
+      modules = groupBy'
+        (meta: dep:
+          let
+            id = dep.id;
+            isNewer = dep.build > meta.buildNumber;
+            # Timestamp values can be bogus, e.g. jitpack.io
+            updated = if (match "[0-9]{8}\.[0-9]{6}" dep.timestamp) != null
+                      then replaceStrings ["."] [""] dep.timestamp
+                      else "";
+          in {
+            groupId = id.group;
+            artifactId = id.name;
+            version = id.version;
+            timestamp = if isNewer then dep.timestamp else meta.timestamp;
+            buildNumber = if isNewer then dep.build else meta.buildNumber;
+            lastUpdated = if isNewer then updated else meta.lastUpdated;
+            versions = meta.versions or [] ++ [{
+              classifier = id.classifier or "";
+              extension = id.extension;
+              value = "${removeSuffix "-SNAPSHOT" id.version}-${dep.timestamp}-${toString dep.build}";
+              updated = updated;
+            }];
+          }
+        )
+        {
+          timestamp = "";
+          buildNumber = -1;
+          lastUpdated = "";
+        }
+        (dep: "${replaceStrings ["."] ["/"] dep.id.group}/${dep.id.name}/${dep.id.version}/maven-metadata.xml")
+        snapshotDeps;
+
+      mkSnapshotVersion = version: ''
+        <snapshotVersion>
+          ${optionalString (version.classifier != "") "<classifier>${version.classifier}</classifier>"}
+          <extension>${version.extension}</extension>
+          <value>${version.value}</value>
+          ${optionalString (version.updated != "") "<updated>${version.updated}</updated>"}
+        </snapshotVersion>
+      '';
+
+    in
+      attrValues (mapAttrs (path: meta:
+        with meta; writeTextDir path ''
+          <?xml version="1.0" encoding="UTF-8"?>
+          <metadata modelVersion="1.1">
+            <groupId>${groupId}</groupId>
+            <artifactId>${artifactId}</artifactId>
+            <version>${version}</version>
+            <versioning>
+              <snapshot>
+                ${optionalString (timestamp != "") "<timestamp>${timestamp}</timestamp>"}
+                ${optionalString (buildNumber != -1) "<buildNumber>${toString buildNumber}</buildNumber>"}
+              </snapshot>
+              ${optionalString (lastUpdated != "") "<lastUpdated>${lastUpdated}</lastUpdated>"}
+              <snapshotVersions>
+                ${concatMapStringsSep "\n    " mkSnapshotVersion versions}
+              </snapshotVersions>
+            </versioning>
+          </metadata>
+        ''
+      ) modules);
+
   mkRepo = project: type: deps: buildEnv {
     name = "${project}-gradle-${type}-env";
-    paths = map mkDep deps;
+    paths = map mkDep deps ++ mkModuleMetadata deps ++ mkSnapshotMetadata deps;
   };
 
   mkInitScript = projectSpec:
     let
-      repos = builtins.mapAttrs (mkRepo projectSpec.name) projectSpec.dependencies;
+      repos = mapAttrs (mkRepo projectSpec.name) projectSpec.dependencies;
     in
       writeText "init.gradle" ''
+        static def offlineRepo(RepositoryHandler repositories, String env, String path) {
+            repositories.clear()
+            repositories.maven {
+                name "Nix''${env.capitalize()}MavenOffline"
+                url path
+                metadataSources {
+                    it.gradleMetadata()
+                    it.mavenPom()
+                    it.artifact()
+                }
+            }
+            repositories.ivy {
+                name "Nix''${env.capitalize()}IvyOffline"
+                url path
+                layout "maven"
+                metadataSources {
+                    it.gradleMetadata()
+                    it.ivyDescriptor()
+                    it.artifact()
+                }
+            }
+        }
+
         gradle.settingsEvaluated {
-          it.pluginManagement.repositories {
+            offlineRepo(it.pluginManagement.repositories, "plugin", "${repos.plugin}")
-            clear()
-            maven { url = uri("${repos.plugin}") }
-          }
         }
 
         gradle.projectsLoaded {
-          allprojects {
+            allprojects {
-            buildscript {
+                buildscript {
-              repositories {
+                    offlineRepo(repositories, "buildscript", "${repos.buildscript}")
-                clear()
+                }
-                maven { url = uri("${repos.buildscript}") }
+                offlineRepo(repositories, "project", "${repos.project}")
-              }
             }
-            repositories {
-              clear()
-              maven { url = uri("${repos.project}") }
-            }
-          }
         }
       '';
 
@@ -95,9 +235,9 @@ let
     gradle = args.gradlePackage or mkGradle projectSpec.gradle;
   };
 
-  gradleEnv = builtins.mapAttrs
+  gradleEnv = mapAttrs
     (_: p: mkProjectEnv p)
-    (builtins.fromJSON (builtins.readFile envSpec));
+    (fromJSON (readFile envSpec));
 
   projectEnv = gradleEnv."";
   pname = args.pname or projectEnv.name;
@@ -118,9 +258,10 @@ in stdenv.mkDerivation (args // {
       "GRADLE_USER_HOME=$(mktemp -d)" \
       gradle --offline --no-daemon --no-build-cache \
         --info --full-stacktrace --warning-mode=all \
-        ${lib.optionalString enableParallelBuilding "--parallel"} \
+        ${optionalString enableParallelBuilding "--parallel"} \
+        ${optionalString enableDebug "-Dorg.gradle.debug=true"} \
         --init-script ${projectEnv.initScript} \
-        ${builtins.concatStringsSep " " gradleFlags}
+        ${concatStringsSep " " gradleFlags}
     )
 
     runHook postBuild

app/src/main/kotlin/org/nixos/gradle2nix/Env.kt

@@ -8,16 +8,7 @@ data class NixGradleEnv(
     val version: String,
     val path: String,
     val gradle: DefaultGradle,
-    val dependencies: Map<String, List<Dependency>>
+    val dependencies: Map<String, List<DefaultArtifact>>
-)
-
-@JsonClass(generateAdapter = true)
-data class Dependency(
-    val name: String,
-    val filename: String,
-    val path: String,
-    val urls: List<String>,
-    val sha256: String
 )
 
 fun buildEnv(builds: Map<String, DefaultBuild>): Map<String, NixGradleEnv> =
@@ -28,58 +19,31 @@ fun buildEnv(builds: Map<String, DefaultBuild>): Map<String, NixGradleEnv> =
             path = path,
             gradle = build.gradle,
             dependencies = mapOf(
-                "plugin" to buildRepo(build.pluginDependencies).values.toList(),
+                "plugin" to build.pluginDependencies,
-                "buildscript" to build.rootProject.collectDependencies(DefaultProject::buildscriptDependencies)
+                "buildscript" to build.rootProject.collectDependencies(DefaultProject::buildscriptDependencies),
-                    .values.toList(),
                 "project" to build.rootProject.collectDependencies(DefaultProject::projectDependencies)
-                    .values.toList()
             )
         )
     }
 
-private fun DefaultProject.collectDependencies(chooser: DefaultProject.() -> DefaultDependencies): Map<DefaultArtifact, Dependency> {
+private fun DefaultProject.collectDependencies(
-    val result = mutableMapOf<DefaultArtifact, Dependency>()
+    chooser: DefaultProject.() -> List<DefaultArtifact>
-    mergeRepo(result, buildRepo(chooser()))
+): List<DefaultArtifact> {
+    val result = mutableMapOf<ArtifactIdentifier, DefaultArtifact>()
+    mergeRepo(result, chooser())
     for (child in children) {
         mergeRepo(result, child.collectDependencies(chooser))
     }
-    return result
+    return result.values.toList()
 }
 
-private fun buildRepo(deps: DefaultDependencies): Map<DefaultArtifact, Dependency> =
+private fun mergeRepo(
-    deps.artifacts.associate { artifact ->
+    base: MutableMap<ArtifactIdentifier, DefaultArtifact>,
-        val name = with(artifact) {
+    extra: List<DefaultArtifact>
-            buildString {
+) {
-                append("$groupId-$artifactId-$version")
+    extra.forEach { artifact ->
-                if (classifier.isNotEmpty()) append("-$classifier")
+        base.merge(artifact.id, artifact) { old, new ->
-                append("-$extension")
+            old.copy(urls = old.urls.union(new.urls).toList())
-                replace(Regex("[^A-Za-z0-9+\\-._?=]"), "_")
-            }
-        }
-        val filename = with(artifact) {
-            buildString {
-                append("$artifactId-$version")
-                if (classifier.isNotEmpty()) append("-$classifier")
-                append(".$extension")
-            }
-        }
-        val path = with(artifact) { "${groupId.replace(".", "/")}/$artifactId/$version" }
-        val dep = Dependency(
-            name = name,
-            filename = filename,
-            path = path,
-            urls = deps.repositories.maven.flatMap { repo ->
-                repo.urls.map { "${it.removeSuffix("/")}/$path/$filename"  }
-            },
-            sha256 = artifact.sha256
-        )
-        artifact to dep
-    }
-
-private fun mergeRepo(base: MutableMap<DefaultArtifact, Dependency>, extra: Map<DefaultArtifact, Dependency>) {
-    extra.forEach { (artifact, dep) ->
-        base.merge(artifact, dep) { old, new ->
-            old.copy(urls = old.urls + (new.urls - old.urls))
         }
     }
 }

app/src/main/kotlin/org/nixos/gradle2nix/GradleRunner.kt

@@ -21,8 +21,10 @@ fun ProjectConnection.getBuildModel(config: Config, path: String): DefaultBuild
             "-Porg.nixos.gradle2nix.configurations=${config.configurations.joinToString(",")}",
             "-Porg.nixos.gradle2nix.subprojects=${config.subprojects.joinToString(",")}"
         )
+        if (config.gradleArgs != null) addArguments(config.gradleArgs)
         if (path.isNotEmpty()) addArguments("--project-dir=$path")
         if (!config.quiet) {
+            setColorOutput(true)
             setStandardOutput(System.err)
             setStandardError(System.err)
         }

app/src/main/kotlin/org/nixos/gradle2nix/Logger.kt

@@ -4,7 +4,8 @@ import java.io.PrintStream
 
 class Logger(
     val out: PrintStream = System.err,
-    val verbose: Boolean) {
+    val verbose: Boolean
+) {
 
     val log: (String) -> Unit = { if (verbose) out.println(it) }
     val warn: (String) -> Unit = { out.println("Warning: $it")}

app/src/main/kotlin/org/nixos/gradle2nix/Main.kt

@@ -8,7 +8,12 @@ import com.github.ajalt.clikt.parameters.arguments.ProcessedArgument
 import com.github.ajalt.clikt.parameters.arguments.argument
 import com.github.ajalt.clikt.parameters.arguments.convert
 import com.github.ajalt.clikt.parameters.arguments.default
-import com.github.ajalt.clikt.parameters.options.*
+import com.github.ajalt.clikt.parameters.options.default
+import com.github.ajalt.clikt.parameters.options.flag
+import com.github.ajalt.clikt.parameters.options.multiple
+import com.github.ajalt.clikt.parameters.options.option
+import com.github.ajalt.clikt.parameters.options.split
+import com.github.ajalt.clikt.parameters.options.validate
 import com.github.ajalt.clikt.parameters.types.file
 import com.squareup.moshi.Moshi
 import com.squareup.moshi.Types
@@ -20,6 +25,7 @@ val shareDir: String = System.getProperty("org.nixos.gradle2nix.share")
 
 data class Config(
     val gradleVersion: String?,
+    val gradleArgs: String?,
     val configurations: List<String>,
     val projectDir: File,
     val includes: List<File>,
@@ -37,6 +43,10 @@ class Main : CliktCommand(
         metavar = "VERSION",
         help = "Use a specific Gradle version")
 
+    private val gradleArgs: String? by option("--gradle-args", "-a",
+        metavar = "ARGS",
+        help = "Extra arguments to pass to Gradle")
+
     private val configurations: List<String> by option("--configuration", "-c",
         metavar = "NAME",
         help = "Add a configuration to resolve (default: all configurations)")
@@ -96,7 +106,16 @@ class Main : CliktCommand(
     }
 
     override fun run() {
-        val config = Config(gradleVersion, configurations, projectDir, includes, subprojects, buildSrc, quiet)
+        val config = Config(
+            gradleVersion,
+            gradleArgs,
+            configurations,
+            projectDir,
+            includes,
+            subprojects,
+            buildSrc,
+            quiet
+        )
         val (log, _, _) = Logger(verbose = !config.quiet)
 
         val paths = resolveProjects(config).map { p ->

build.gradle.kts

@@ -3,15 +3,20 @@ plugins {
     idea
     kotlin("jvm") version embeddedKotlinVersion apply false
     kotlin("kapt") version embeddedKotlinVersion apply false
-    id("com.github.johnrengelman.shadow") version "5.1.0" apply false
+    id("com.github.johnrengelman.shadow") version "5.2.0" apply false
-    id("org.ajoberstar.stutter") version "0.5.0" apply false
+    id("org.ajoberstar.stutter") version "0.5.1" apply false
 }
 
+group = "org.nixos.gradle2nix"
+version = property("VERSION") ?: "unspecified"
+
 subprojects {
     repositories {
         jcenter()
         maven { url = uri("https://repo.gradle.org/gradle/libs-releases") }
     }
+    group = rootProject.group
+    version = rootProject.version
 }
 
 allprojects {
@@ -45,7 +50,7 @@ allprojects {
 
 tasks {
     wrapper {
-        gradleVersion = "5.6.3"
+        gradleVersion = "6.1"
         distributionType = Wrapper.DistributionType.ALL
     }
 }

fixtures/basic/basic-java-project/groovy/build.gradle

@@ -0,0 +1,13 @@
+plugins {
+    id 'java'
+}
+
+repositories {
+    jcenter()
+    mavenCentral()
+}
+
+dependencies {
+    implementation 'com.squareup.okio:okio:2.2.2'
+    implementation 'com.squareup.moshi:moshi:1.8.0'
+}

fixtures/basic/basic-java-project/kotlin/build.gradle.kts

@@ -0,0 +1,13 @@
+plugins {
+    java
+}
+
+repositories {
+    jcenter()
+    mavenCentral()
+}
+
+dependencies {
+    implementation("com.squareup.okio:okio:2.2.2")
+    implementation("com.squareup.moshi:moshi:1.8.0")
+}

fixtures/dependency/classifier/groovy/build.gradle

@@ -0,0 +1,11 @@
+plugins {
+    id 'java'
+}
+
+repositories {
+    mavenCentral()
+}
+
+dependencies {
+    implementation 'com.badlogicgames.gdx:gdx-platform:1.9.9:natives-desktop'
+}

fixtures/dependency/classifier/kotlin/build.gradle.kts

@@ -0,0 +1,11 @@
+plugins {
+    java
+}
+
+repositories {
+    mavenCentral()
+}
+
+dependencies {
+    implementation("com.badlogicgames.gdx:gdx-platform:1.9.9:natives-desktop")
+}

fixtures/dependency/dynamic-snapshot/groovy/build.gradle

@@ -0,0 +1,12 @@
+plugins {
+    id 'java'
+}
+
+repositories {
+    jcenter()
+    maven { url 'https://jitpack.io' }
+}
+
+dependencies {
+    implementation 'com.github.anuken:packr:-SNAPSHOT'
+}

fixtures/dependency/snapshot/groovy/build.gradle

@@ -0,0 +1,12 @@
+plugins {
+    id "java"
+}
+
+repositories {
+    mavenCentral()
+    maven { url "https://oss.sonatype.org/content/repositories/snapshots/" }
+}
+
+dependencies {
+    implementation "com.squareup.okio:okio:2.5.0-SNAPSHOT"
+}

fixtures/dependency/snapshot/kotlin/build.gradle.kts

@@ -0,0 +1,12 @@
+plugins {
+    java
+}
+
+repositories {
+    mavenCentral()
+    maven { url = uri("https://oss.sonatype.org/content/repositories/snapshots/") }
+}
+
+dependencies {
+    "implementation"("com.squareup.okio:okio:2.5.0-SNAPSHOT")
+}

fixtures/ivy/basic/kotlin/build.gradle.kts

@@ -0,0 +1,20 @@
+plugins {
+    java
+}
+
+repositories {
+    ivy {
+        url = uri("https://asset.opendof.org")
+        layout("pattern") {
+            this as IvyPatternRepositoryLayout
+            ivy("ivy2/[organisation]/[module]/[revision]/ivy(.[platform]).xml")
+            artifact("artifact/[organisation]/[module]/[revision](/[platform])(/[type]s)/[artifact]-[revision](-[classifier]).[ext]")
+        }
+    }
+}
+
+dependencies {
+    dependencies {
+        implementation("org.opendof.core-java:dof-cipher-sms4:1.0")
+    }
+}

fixtures/plugin/resolves-from-default-repo/groovy/build.gradle

@@ -0,0 +1,7 @@
+plugins {
+    id "org.jetbrains.kotlin.jvm" version "1.3.50"
+}
+
+repositories {
+    jcenter()
+}

fixtures/plugin/resolves-from-default-repo/kotlin/build.gradle.kts

@@ -0,0 +1,7 @@
+plugins {
+    kotlin("jvm") version "1.3.50"
+}
+
+repositories {
+    jcenter()
+}

fixtures/subprojects/dependent-subprojects/groovy/build.gradle

@@ -0,0 +1,15 @@
+subprojects {
+    apply plugin: 'java'
+}
+
+project(':child-a') {
+    dependencies {
+        implementation project(':child-b')
+    }
+}
+
+project(':child-b') {
+    dependencies {
+        implementation project(':child-c')
+    }
+}

fixtures/subprojects/dependent-subprojects/groovy/settings.gradle

@@ -0,0 +1 @@
+include ':child-a', ':child-b', ':child-c', ':child-d'

fixtures/subprojects/multi-module/groovy/build.gradle

@@ -0,0 +1,13 @@
+plugins {
+    id 'java'
+}
+
+allprojects {
+    repositories {
+        jcenter()
+    }
+}
+
+dependencies {
+    testImplementation 'junit:junit:4.12'
+}

fixtures/subprojects/multi-module/groovy/child-a/build.gradle

@@ -0,0 +1,7 @@
+plugins {
+    id 'java'
+}
+
+dependencies {
+    implementation 'com.squareup.okio:okio:2.2.2'
+}

fixtures/subprojects/multi-module/groovy/child-b/build.gradle

@@ -0,0 +1,8 @@
+plugins {
+    id 'java'
+}
+
+dependencies {
+    implementation project(':child-a')
+    implementation 'com.squareup.moshi:moshi:1.8.0'
+}

fixtures/subprojects/multi-module/groovy/settings.gradle

@@ -0,0 +1 @@
+include ':child-a', ':child-b'

fixtures/subprojects/multi-module/kotlin/build.gradle.kts

@@ -0,0 +1,13 @@
+plugins {
+    java
+}
+
+allprojects {
+    repositories {
+        jcenter()
+    }
+}
+
+dependencies {
+    testImplementation("junit:junit:4.12")
+}

fixtures/subprojects/multi-module/kotlin/child-a/build.gradle.kts

@@ -0,0 +1,7 @@
+plugins {
+    java
+}
+
+dependencies {
+    implementation("com.squareup.okio:okio:2.2.2")
+}

fixtures/subprojects/multi-module/kotlin/child-b/build.gradle.kts

@@ -0,0 +1,8 @@
+plugins {
+    java
+}
+
+dependencies {
+    implementation(project(":child-a"))
+    implementation("com.squareup.moshi:moshi:1.8.0")
+}

fixtures/subprojects/multi-module/kotlin/settings.gradle.kts

@@ -0,0 +1 @@
+include(":child-a", ":child-b")

gradle-env.nix

@@ -19,7 +19,7 @@
 #         '';
 #       }
 
-{ stdenv, lib, buildEnv, fetchurl, gradleGen, writeText }:
+{ stdenv, buildEnv, fetchurl, gradleGen, writeText, writeTextDir }:
 
 { envSpec
 , pname ? null
@@ -27,9 +27,18 @@
 , enableParallelBuilding ? true
 , gradleFlags ? [ "build" ]
 , gradlePackage ? null
+, enableDebug ? false
 , ... } @ args:
 
 let
+  inherit (builtins)
+    filter sort replaceStrings attrValues match fromJSON
+    concatStringsSep;
+
+  inherit (stdenv.lib)
+    versionOlder unique mapAttrs last concatMapStringsSep removeSuffix
+    optionalString groupBy' readFile hasSuffix;
+
   mkDep = depSpec: stdenv.mkDerivation {
     inherit (depSpec) name;
 
@@ -41,40 +50,171 @@ let
 
     installPhase = ''
       mkdir -p $out/${depSpec.path}
-      ln -s $src $out/${depSpec.path}/${depSpec.filename}
+      ln -s $src $out/${depSpec.path}/${depSpec.name}
     '';
   };
 
+  mkModuleMetadata = deps:
+    let
+      ids = filter
+        (id: id.type == "pom")
+        (map (dep: dep.id) deps);
+
+      modules = groupBy'
+        (meta: id:
+          let
+            isNewer = versionOlder meta.latest id.version;
+            isNewerRelease =
+              !(hasSuffix "-SNAPSHOT" id.version) &&
+              versionOlder meta.release id.version;
+          in {
+            groupId = id.group;
+            artifactId = id.name;
+            latest = if isNewer then id.version else meta.latest;
+            release = if isNewerRelease then id.version else meta.release;
+            versions = meta.versions ++ [id.version];
+          }
+        )
+        {
+          latest = "";
+          release = "";
+          versions = [];
+        }
+        (id: "${replaceStrings ["."] ["/"] id.group}/${id.name}/maven-metadata.xml")
+        ids;
+
+    in
+      attrValues (mapAttrs (path: meta:
+        let
+          versions' = sort versionOlder (unique meta.versions);
+        in
+          with meta; writeTextDir path ''
+            <?xml version="1.0" encoding="UTF-8"?>
+            <metadata modelVersion="1.1">
+              <groupId>${groupId}</groupId>
+              <artifactId>${artifactId}</artifactId>
+              <versioning>
+                ${optionalString (latest != "") "<latest>${latest}</latest>"}
+                ${optionalString (release != "") "<release>${release}</release>"}
+                <versions>
+                  ${concatMapStringsSep "\n    " (v: "<version>${v}</version>") versions'}
+                </versions>
+              </versioning>
+            </metadata>
+          ''
+      ) modules);
+
+  mkSnapshotMetadata = deps:
+    let
+      snapshotDeps = filter (dep: dep ? build && dep ? timestamp) deps;
+
+      modules = groupBy'
+        (meta: dep:
+          let
+            id = dep.id;
+            isNewer = dep.build > meta.buildNumber;
+            # Timestamp values can be bogus, e.g. jitpack.io
+            updated = if (match "[0-9]{8}\.[0-9]{6}" dep.timestamp) != null
+                      then replaceStrings ["."] [""] dep.timestamp
+                      else "";
+          in {
+            groupId = id.group;
+            artifactId = id.name;
+            version = id.version;
+            timestamp = if isNewer then dep.timestamp else meta.timestamp;
+            buildNumber = if isNewer then dep.build else meta.buildNumber;
+            lastUpdated = if isNewer then updated else meta.lastUpdated;
+            versions = meta.versions or [] ++ [{
+              classifier = id.classifier or "";
+              extension = id.extension;
+              value = "${removeSuffix "-SNAPSHOT" id.version}-${dep.timestamp}-${toString dep.build}";
+              updated = updated;
+            }];
+          }
+        )
+        {
+          timestamp = "";
+          buildNumber = -1;
+          lastUpdated = "";
+        }
+        (dep: "${replaceStrings ["."] ["/"] dep.id.group}/${dep.id.name}/${dep.id.version}/maven-metadata.xml")
+        snapshotDeps;
+
+      mkSnapshotVersion = version: ''
+        <snapshotVersion>
+          ${optionalString (version.classifier != "") "<classifier>${version.classifier}</classifier>"}
+          <extension>${version.extension}</extension>
+          <value>${version.value}</value>
+          ${optionalString (version.updated != "") "<updated>${version.updated}</updated>"}
+        </snapshotVersion>
+      '';
+
+    in
+      attrValues (mapAttrs (path: meta:
+        with meta; writeTextDir path ''
+          <?xml version="1.0" encoding="UTF-8"?>
+          <metadata modelVersion="1.1">
+            <groupId>${groupId}</groupId>
+            <artifactId>${artifactId}</artifactId>
+            <version>${version}</version>
+            <versioning>
+              <snapshot>
+                ${optionalString (timestamp != "") "<timestamp>${timestamp}</timestamp>"}
+                ${optionalString (buildNumber != -1) "<buildNumber>${toString buildNumber}</buildNumber>"}
+              </snapshot>
+              ${optionalString (lastUpdated != "") "<lastUpdated>${lastUpdated}</lastUpdated>"}
+              <snapshotVersions>
+                ${concatMapStringsSep "\n    " mkSnapshotVersion versions}
+              </snapshotVersions>
+            </versioning>
+          </metadata>
+        ''
+      ) modules);
+
   mkRepo = project: type: deps: buildEnv {
     name = "${project}-gradle-${type}-env";
-    paths = map mkDep deps;
+    paths = map mkDep deps ++ mkModuleMetadata deps ++ mkSnapshotMetadata deps;
   };
 
   mkInitScript = projectSpec:
     let
-      repos = builtins.mapAttrs (mkRepo projectSpec.name) projectSpec.dependencies;
+      repos = mapAttrs (mkRepo projectSpec.name) projectSpec.dependencies;
     in
       writeText "init.gradle" ''
+        static def offlineRepo(RepositoryHandler repositories, String env, String path) {
+            repositories.clear()
+            repositories.maven {
+                name "Nix''${env.capitalize()}MavenOffline"
+                url path
+                metadataSources {
+                    it.gradleMetadata()
+                    it.mavenPom()
+                    it.artifact()
+                }
+            }
+            repositories.ivy {
+                name "Nix''${env.capitalize()}IvyOffline"
+                url path
+                layout "maven"
+                metadataSources {
+                    it.gradleMetadata()
+                    it.ivyDescriptor()
+                    it.artifact()
+                }
+            }
+        }
+
         gradle.settingsEvaluated {
-          it.pluginManagement.repositories {
+            offlineRepo(it.pluginManagement.repositories, "plugin", "${repos.plugin}")
-            clear()
-            maven { url = uri("${repos.plugin}") }
-          }
         }
 
         gradle.projectsLoaded {
-          allprojects {
+            allprojects {
-            buildscript {
+                buildscript {
-              repositories {
+                    offlineRepo(repositories, "buildscript", "${repos.buildscript}")
-                clear()
+                }
-                maven { url = uri("${repos.buildscript}") }
+                offlineRepo(repositories, "project", "${repos.project}")
-              }
             }
-            repositories {
-              clear()
-              maven { url = uri("${repos.project}") }
-            }
-          }
         }
       '';
 
@@ -95,9 +235,9 @@ let
     gradle = args.gradlePackage or mkGradle projectSpec.gradle;
   };
 
-  gradleEnv = builtins.mapAttrs
+  gradleEnv = mapAttrs
     (_: p: mkProjectEnv p)
-    (builtins.fromJSON (builtins.readFile envSpec));
+    (fromJSON (readFile envSpec));
 
   projectEnv = gradleEnv."";
   pname = args.pname or projectEnv.name;
@@ -118,9 +258,10 @@ in stdenv.mkDerivation (args // {
       "GRADLE_USER_HOME=$(mktemp -d)" \
       gradle --offline --no-daemon --no-build-cache \
         --info --full-stacktrace --warning-mode=all \
-        ${lib.optionalString enableParallelBuilding "--parallel"} \
+        ${optionalString enableParallelBuilding "--parallel"} \
+        ${optionalString enableDebug "-Dorg.gradle.debug=true"} \
         --init-script ${projectEnv.initScript} \
-        ${builtins.concatStringsSep " " gradleFlags}
+        ${concatStringsSep " " gradleFlags}
     )
 
     runHook postBuild

gradle.properties

@@ -0,0 +1,3 @@
+org.gradle.jvmargs='-Dfile.encoding=UTF-8'
+
+VERSION=1.0.0-rc1

gradle/wrapper/gradle-wrapper.properties

@@ -1,5 +1,5 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-5.6.3-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-6.1-all.zip
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists

gradlew

@@ -154,19 +154,19 @@ if [ "$cygwin" = "true" -o "$msys" = "true" ] ; then
         else
             eval `echo args$i`="\"$arg\""
         fi
-        i=$((i+1))
+        i=`expr $i + 1`
     done
     case $i in
-        (0) set -- ;;
+        0) set -- ;;
-        (1) set -- "$args0" ;;
+        1) set -- "$args0" ;;
-        (2) set -- "$args0" "$args1" ;;
+        2) set -- "$args0" "$args1" ;;
-        (3) set -- "$args0" "$args1" "$args2" ;;
+        3) set -- "$args0" "$args1" "$args2" ;;
-        (4) set -- "$args0" "$args1" "$args2" "$args3" ;;
+        4) set -- "$args0" "$args1" "$args2" "$args3" ;;
-        (5) set -- "$args0" "$args1" "$args2" "$args3" "$args4" ;;
+        5) set -- "$args0" "$args1" "$args2" "$args3" "$args4" ;;
-        (6) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" ;;
+        6) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" ;;
-        (7) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" ;;
+        7) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" ;;
-        (8) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" ;;
+        8) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" ;;
-        (9) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" "$args8" ;;
+        9) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" "$args8" ;;
     esac
 fi
 
@@ -175,14 +175,9 @@ save () {
     for i do printf %s\\n "$i" | sed "s/'/'\\\\''/g;1s/^/'/;\$s/\$/' \\\\/" ; done
     echo " "
 }
-APP_ARGS=$(save "$@")
+APP_ARGS=`save "$@"`
 
 # Collect all arguments for the java command, following the shell quoting and substitution rules
 eval set -- $DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS "\"-Dorg.gradle.appname=$APP_BASE_NAME\"" -classpath "\"$CLASSPATH\"" org.gradle.wrapper.GradleWrapperMain "$APP_ARGS"
 
-# by default we should be in the correct project dir, but when run from Finder on Mac, the cwd is wrong
-if [ "$(uname)" = "Darwin" ] && [ "$HOME" = "$PWD" ]; then
-  cd "$(dirname "$0")"
-fi
-
 exec "$JAVACMD" "$@"

model/build.gradle.kts

@@ -4,7 +4,7 @@ plugins {
 }
 
 dependencies {
-    api("com.squareup.moshi:moshi:+")
+    api("com.squareup.moshi:moshi:latest.release")
-    api("com.squareup.okio:okio:+")
+    kapt("com.squareup.moshi:moshi-kotlin-codegen:latest.release")
-    kapt("com.squareup.moshi:moshi-kotlin-codegen:+")
+    implementation("net.swiftzer.semver:semver:latest.release")
 }

model/gradle/dependency-locks/compileClasspath.lockfile

@@ -1,11 +1,12 @@
 # This is a Gradle generated file for dependency locking.
 # Manual edits can break the build and are not advised.
 # This file is expected to be part of source control.
-com.squareup.moshi:moshi:1.9.1
+com.squareup.moshi:moshi:1.9.2
-com.squareup.okio:okio:2.4.1
+com.squareup.okio:okio:1.16.0
-org.jetbrains.kotlin:kotlin-reflect:1.3.41
+net.swiftzer.semver:semver:1.1.1
-org.jetbrains.kotlin:kotlin-stdlib-common:1.3.50
+org.jetbrains.kotlin:kotlin-reflect:1.3.61
-org.jetbrains.kotlin:kotlin-stdlib-jdk7:1.3.41
+org.jetbrains.kotlin:kotlin-stdlib-common:1.3.61
-org.jetbrains.kotlin:kotlin-stdlib-jdk8:1.3.41
+org.jetbrains.kotlin:kotlin-stdlib-jdk7:1.3.61
-org.jetbrains.kotlin:kotlin-stdlib:1.3.50
+org.jetbrains.kotlin:kotlin-stdlib-jdk8:1.3.61
+org.jetbrains.kotlin:kotlin-stdlib:1.3.61
 org.jetbrains:annotations:13.0

model/gradle/dependency-locks/runtimeClasspath.lockfile

@@ -1,8 +1,6 @@
 # This is a Gradle generated file for dependency locking.
 # Manual edits can break the build and are not advised.
 # This file is expected to be part of source control.
-com.squareup.moshi:moshi:1.9.1
+com.squareup.moshi:moshi:1.9.2
-com.squareup.okio:okio:2.4.1
+com.squareup.okio:okio:1.16.0
-org.jetbrains.kotlin:kotlin-stdlib-common:1.3.50
+net.swiftzer.semver:semver:1.1.1
-org.jetbrains.kotlin:kotlin-stdlib:1.3.50
-org.jetbrains:annotations:13.0

model/gradle/dependency-locks/testCompileClasspath.lockfile

@@ -1,11 +1,12 @@
 # This is a Gradle generated file for dependency locking.
 # Manual edits can break the build and are not advised.
 # This file is expected to be part of source control.
-com.squareup.moshi:moshi:1.9.1
+com.squareup.moshi:moshi:1.9.2
-com.squareup.okio:okio:2.4.1
+com.squareup.okio:okio:1.16.0
-org.jetbrains.kotlin:kotlin-reflect:1.3.41
+net.swiftzer.semver:semver:1.1.1
-org.jetbrains.kotlin:kotlin-stdlib-common:1.3.50
+org.jetbrains.kotlin:kotlin-reflect:1.3.61
-org.jetbrains.kotlin:kotlin-stdlib-jdk7:1.3.41
+org.jetbrains.kotlin:kotlin-stdlib-common:1.3.61
-org.jetbrains.kotlin:kotlin-stdlib-jdk8:1.3.41
+org.jetbrains.kotlin:kotlin-stdlib-jdk7:1.3.61
-org.jetbrains.kotlin:kotlin-stdlib:1.3.50
+org.jetbrains.kotlin:kotlin-stdlib-jdk8:1.3.61
+org.jetbrains.kotlin:kotlin-stdlib:1.3.61
 org.jetbrains:annotations:13.0

model/gradle/dependency-locks/testRuntimeClasspath.lockfile

@@ -1,11 +1,12 @@
 # This is a Gradle generated file for dependency locking.
 # Manual edits can break the build and are not advised.
 # This file is expected to be part of source control.
-com.squareup.moshi:moshi:1.9.1
+com.squareup.moshi:moshi:1.9.2
-com.squareup.okio:okio:2.4.1
+com.squareup.okio:okio:1.16.0
-org.jetbrains.kotlin:kotlin-reflect:1.3.41
+net.swiftzer.semver:semver:1.1.1
-org.jetbrains.kotlin:kotlin-stdlib-common:1.3.50
+org.jetbrains.kotlin:kotlin-reflect:1.3.61
-org.jetbrains.kotlin:kotlin-stdlib-jdk7:1.3.41
+org.jetbrains.kotlin:kotlin-stdlib-common:1.3.61
-org.jetbrains.kotlin:kotlin-stdlib-jdk8:1.3.41
+org.jetbrains.kotlin:kotlin-stdlib-jdk7:1.3.61
-org.jetbrains.kotlin:kotlin-stdlib:1.3.50
+org.jetbrains.kotlin:kotlin-stdlib-jdk8:1.3.61
+org.jetbrains.kotlin:kotlin-stdlib:1.3.61
 org.jetbrains:annotations:13.0

model/src/main/kotlin/org/nixos/gradle2nix/Impl.kt

@@ -1,20 +1,22 @@
 package org.nixos.gradle2nix
 
 import com.squareup.moshi.JsonClass
+import net.swiftzer.semver.SemVer
 import java.io.Serializable
+import java.lang.IllegalArgumentException
 
 @JsonClass(generateAdapter = true)
 data class DefaultBuild(
     override val gradle: DefaultGradle,
-    override val pluginDependencies: DefaultDependencies,
+    override val pluginDependencies: List<DefaultArtifact>,
     override val rootProject: DefaultProject,
     override val includedBuilds: List<DefaultIncludedBuild>
 ) : Build, Serializable {
     constructor(model: Build) : this(
         DefaultGradle(model.gradle),
-        DefaultDependencies(model.pluginDependencies),
+        model.pluginDependencies.map(::DefaultArtifact),
         DefaultProject(model.rootProject),
-        model.includedBuilds.map { DefaultIncludedBuild(it) }
+        model.includedBuilds.map(::DefaultIncludedBuild)
     )
 }
 
@@ -52,8 +54,8 @@ data class DefaultProject(
     override val version: String,
     override val path: String,
     override val projectDir: String,
-    override val buildscriptDependencies: DefaultDependencies,
+    override val buildscriptDependencies: List<DefaultArtifact>,
-    override val projectDependencies: DefaultDependencies,
+    override val projectDependencies: List<DefaultArtifact>,
     override val children: List<DefaultProject>
 ) : Project, Serializable {
     constructor(model: Project) : this(
@@ -61,59 +63,75 @@ data class DefaultProject(
         model.version,
         model.path,
         model.projectDir,
-        DefaultDependencies(model.buildscriptDependencies),
+        model.buildscriptDependencies.map(::DefaultArtifact),
-        DefaultDependencies(model.projectDependencies),
+        model.projectDependencies.map(::DefaultArtifact),
         model.children.map { DefaultProject(it) }
     )
 }
 
-@JsonClass(generateAdapter = true)
-data class DefaultDependencies(
-    override val repositories: DefaultRepositories,
-    override val artifacts: List<DefaultArtifact>
-) : Dependencies, Serializable {
-    constructor(model: Dependencies) : this(
-        DefaultRepositories(model.repositories),
-        model.artifacts.map { DefaultArtifact(it) }
-    )
-}
-
-@JsonClass(generateAdapter = true)
-data class DefaultRepositories(
-    override val maven: List<DefaultMaven>
-) : Repositories, Serializable {
-    constructor(model: Repositories) : this(
-        model.maven.map { DefaultMaven(it) }
-    )
-}
-
-@JsonClass(generateAdapter = true)
-data class DefaultMaven(
-    override val urls: List<String>
-) : Maven, Serializable {
-    constructor(model: Maven) : this(
-        model.urls.toList()
-    )
-}
-
 @JsonClass(generateAdapter = true)
 data class DefaultArtifact(
-    override val groupId: String,
+    override val id: DefaultArtifactIdentifier,
-    override val artifactId: String,
+    override val name: String,
-    override val version: String,
+    override val path: String,
-    override val classifier: String,
+    override val timestamp: String? = null,
-    override val extension: String,
+    override val build: Int? = null,
+    override val urls: List<String>,
     override val sha256: String
 ) : Artifact, Comparable<DefaultArtifact>, Serializable {
     constructor(model: Artifact) : this(
-        model.groupId,
+        DefaultArtifactIdentifier(model.id),
-        model.artifactId,
+        model.name,
-        model.version,
+        model.path,
-        model.classifier,
+        model.timestamp,
-        model.extension,
+        model.build,
+        model.urls,
         model.sha256
     )
 
-    override fun toString() = "$groupId:$artifactId:$version:$classifier:$extension"
+    override fun toString() = id.toString()
-    override fun compareTo(other: DefaultArtifact): Int = toString().compareTo(other.toString())
+    override fun compareTo(other: DefaultArtifact): Int = id.compareTo(other.id)
+}
+
+@JsonClass(generateAdapter = true)
+data class DefaultArtifactIdentifier(
+    override val group: String,
+    override val name: String,
+    override val version: String,
+    override val type: String,
+    override val extension: String = type,
+    override val classifier: String? = null
+) : ArtifactIdentifier, Comparable<DefaultArtifactIdentifier>, Serializable {
+    constructor(model: ArtifactIdentifier) : this(
+        model.group,
+        model.name,
+        model.version,
+        model.type,
+        model.extension,
+        model.classifier
+    )
+
+    @delegate:Transient
+    private val semver: SemVer? by lazy {
+        try {
+            SemVer.parse(version)
+        } catch (_: IllegalArgumentException) {
+            null
+        }
+    }
+
+    override fun compareTo(other: DefaultArtifactIdentifier): Int {
+        return group.compareTo(other.group).takeUnless { it == 0 }
+            ?: name.compareTo(other.name).takeUnless { it == 0 }
+            ?: other.semver?.let { semver?.compareTo(it) }?.takeUnless { it == 0 }
+            ?: type.compareTo(other.type).takeUnless { it == 0 }
+            ?: other.classifier?.let { classifier?.compareTo(it) }?.takeUnless { it == 0 }
+            ?: 0
+    }
+
+    override fun toString(): String = buildString {
+        append("$group:$name:$version")
+        if (classifier != null) append(":$classifier")
+        append("@$type")
+    }
 }

model/src/main/kotlin/org/nixos/gradle2nix/Model.kt

@@ -2,7 +2,7 @@ package org.nixos.gradle2nix
 
 interface Build {
     val gradle: Gradle
-    val pluginDependencies: Dependencies
+    val pluginDependencies: List<Artifact>
     val rootProject: Project
     val includedBuilds: List<IncludedBuild>
 }
@@ -25,29 +25,26 @@ interface Project {
     val version: String
     val path: String
     val projectDir: String
-    val buildscriptDependencies: Dependencies
+    val buildscriptDependencies: List<Artifact>
-    val projectDependencies: Dependencies
+    val projectDependencies: List<Artifact>
     val children: List<Project>
 }
 
-interface Dependencies {
-    val repositories: Repositories
-    val artifacts: List<Artifact>
-}
-
-interface Repositories {
-    val maven: List<Maven>
-}
-
-interface Maven {
-    val urls: List<String>
-}
-
 interface Artifact {
-    val groupId: String
+    val id: ArtifactIdentifier
-    val artifactId: String
+    val name: String
-    val version: String
+    val path: String
-    val classifier: String
+    val timestamp: String?
-    val extension: String
+    val build: Int?
+    val urls: List<String>
     val sha256: String
 }
+
+interface ArtifactIdentifier {
+    val group: String
+    val name: String
+    val version: String
+    val type: String
+    val extension: String
+    val classifier: String?
+}

plugin/.stutter/java11.lock

@@ -5,4 +5,6 @@
 5.3.1
 5.4.1
 5.5.1
-5.6.3
+5.6.4
+6.0.1
+6.1

plugin/.stutter/java8.lock

@@ -12,4 +12,6 @@
 5.3.1
 5.4.1
 5.5.1
-5.6.3
+5.6.4
+6.0.1
+6.1

plugin/build.gradle.kts

@@ -9,12 +9,14 @@ plugins {
     id("com.github.johnrengelman.shadow")
     id("org.ajoberstar.stutter")
 }
-apply {
-    plugin("kotlin")
-}
 
-group = "org.nixos"
+sourceSets {
-version = "1.0.0-SNAPSHOT"
+    compatTest {
+        resources {
+            srcDir("$rootDir/fixtures")
+        }
+    }
+}
 
 dependencyLocking {
     lockAllConfigurations()
@@ -30,17 +32,21 @@ dependencies {
     implementation(project(":model"))
     shadow(gradleApi())
     compileOnly("org.gradle:gradle-tooling-api:${gradle.gradleVersion}")
-    implementation("org.apache.maven:maven-model:latest.release")
+    implementation("org.apache.ivy:ivy:latest.release")
-    implementation("org.apache.maven:maven-model-builder:latest.release")
+    implementation("org.apache.maven:maven-repository-metadata:latest.release")
 
     compatTestImplementation(embeddedKotlin("stdlib-jdk8"))
     compatTestImplementation(embeddedKotlin("test-junit5"))
     compatTestImplementation(embeddedKotlin("reflect"))
-    compatTestImplementation("org.junit.jupiter:junit-jupiter-api:5.4+")
+    compatTestImplementation("org.junit.jupiter:junit-jupiter-api:latest.release")
-    compatTestRuntimeOnly("org.junit.jupiter:junit-jupiter-engine:5.4+")
+    compatTestRuntimeOnly("org.junit.jupiter:junit-jupiter-engine:latest.release")
+    compatTestImplementation("org.junit.jupiter:junit-jupiter-params:latest.release")
+    compatTestRuntimeOnly("org.junit.platform:junit-platform-launcher:latest.release")
+    compatTestImplementation("dev.minutest:minutest:latest.release")
     compatTestImplementation(gradleTestKit())
     compatTestImplementation(project(":model"))
     compatTestImplementation("io.strikt:strikt-core:latest.release")
+    compatTestImplementation("com.squareup.okio:okio:latest.release")
 }
 
 gradlePlugin {

plugin/gradle/dependency-locks/buildscript-classpath.lockfile

@@ -7,28 +7,31 @@ commons-logging:commons-logging:1.2
 de.undercouch:gradle-download-task:3.4.3
 org.apache.httpcomponents:httpclient:4.5.3
 org.apache.httpcomponents:httpcore:4.4.6
-org.gradle.kotlin.kotlin-dsl:org.gradle.kotlin.kotlin-dsl.gradle.plugin:1.2.9
+org.gradle.kotlin.kotlin-dsl:org.gradle.kotlin.kotlin-dsl.gradle.plugin:1.3.3
-org.gradle.kotlin:plugins:1.2.9
+org.gradle.kotlin:plugins:1.3.3
 org.jetbrains.intellij.deps:trove4j:1.0.20181211
-org.jetbrains.kotlin:kotlin-android-extensions:1.3.41
+org.jetbrains.kotlin:kotlin-android-extensions:1.3.61
-org.jetbrains.kotlin:kotlin-annotation-processing-gradle:1.3.41
+org.jetbrains.kotlin:kotlin-annotation-processing-gradle:1.3.61
-org.jetbrains.kotlin:kotlin-build-common:1.3.41
+org.jetbrains.kotlin:kotlin-build-common:1.3.61
-org.jetbrains.kotlin:kotlin-compiler-embeddable:1.3.41
+org.jetbrains.kotlin:kotlin-compiler-embeddable:1.3.61
-org.jetbrains.kotlin:kotlin-compiler-runner:1.3.41
+org.jetbrains.kotlin:kotlin-compiler-runner:1.3.61
-org.jetbrains.kotlin:kotlin-daemon-client:1.3.41
+org.jetbrains.kotlin:kotlin-daemon-client:1.3.61
-org.jetbrains.kotlin:kotlin-gradle-plugin-api:1.3.41
+org.jetbrains.kotlin:kotlin-daemon-embeddable:1.3.61
-org.jetbrains.kotlin:kotlin-gradle-plugin-model:1.3.41
+org.jetbrains.kotlin:kotlin-gradle-plugin-api:1.3.61
-org.jetbrains.kotlin:kotlin-gradle-plugin:1.3.41
+org.jetbrains.kotlin:kotlin-gradle-plugin-model:1.3.61
-org.jetbrains.kotlin:kotlin-reflect:1.3.41
+org.jetbrains.kotlin:kotlin-gradle-plugin:1.3.61
-org.jetbrains.kotlin:kotlin-sam-with-receiver:1.3.41
+org.jetbrains.kotlin:kotlin-native-utils:1.3.61
-org.jetbrains.kotlin:kotlin-script-runtime:1.3.41
+org.jetbrains.kotlin:kotlin-reflect:1.3.61
-org.jetbrains.kotlin:kotlin-scripting-common:1.3.41
+org.jetbrains.kotlin:kotlin-sam-with-receiver:1.3.61
-org.jetbrains.kotlin:kotlin-scripting-compiler-embeddable:1.3.41
+org.jetbrains.kotlin:kotlin-script-runtime:1.3.61
-org.jetbrains.kotlin:kotlin-scripting-compiler-impl-embeddable:1.3.41
+org.jetbrains.kotlin:kotlin-scripting-common:1.3.61
-org.jetbrains.kotlin:kotlin-scripting-jvm:1.3.41
+org.jetbrains.kotlin:kotlin-scripting-compiler-embeddable:1.3.61
-org.jetbrains.kotlin:kotlin-stdlib-common:1.3.41
+org.jetbrains.kotlin:kotlin-scripting-compiler-impl-embeddable:1.3.61
-org.jetbrains.kotlin:kotlin-stdlib-jdk7:1.3.41
+org.jetbrains.kotlin:kotlin-scripting-jvm:1.3.61
-org.jetbrains.kotlin:kotlin-stdlib-jdk8:1.3.41
+org.jetbrains.kotlin:kotlin-stdlib-common:1.3.61
-org.jetbrains.kotlin:kotlin-stdlib:1.3.41
+org.jetbrains.kotlin:kotlin-stdlib-jdk7:1.3.61
-org.jetbrains.kotlinx:kotlinx-coroutines-core:1.1.1
+org.jetbrains.kotlin:kotlin-stdlib-jdk8:1.3.61
+org.jetbrains.kotlin:kotlin-stdlib:1.3.61
+org.jetbrains.kotlin:kotlin-util-io:1.3.61
+org.jetbrains.kotlinx:kotlinx-coroutines-core:1.2.1
 org.jetbrains:annotations:13.0

plugin/gradle/dependency-locks/compatTestCompileClasspath.lockfile

@@ -1,20 +1,23 @@
 # This is a Gradle generated file for dependency locking.
 # Manual edits can break the build and are not advised.
 # This file is expected to be part of source control.
-com.squareup.moshi:moshi:1.9.1
+com.squareup.moshi:moshi:1.9.2
-com.squareup.okio:okio:2.4.1
+com.squareup.okio:okio:2.4.3
-io.strikt:strikt-core:0.22.2
+dev.minutest:minutest:1.10.0
-org.apiguardian:apiguardian-api:1.0.0
+io.strikt:strikt-core:0.23.4
-org.jetbrains.kotlin:kotlin-reflect:1.3.41
+org.apiguardian:apiguardian-api:1.1.0
-org.jetbrains.kotlin:kotlin-stdlib-common:1.3.50
+org.jetbrains.kotlin:kotlin-reflect:1.3.61
-org.jetbrains.kotlin:kotlin-stdlib-jdk7:1.3.50
+org.jetbrains.kotlin:kotlin-stdlib-common:1.3.61
-org.jetbrains.kotlin:kotlin-stdlib-jdk8:1.3.50
+org.jetbrains.kotlin:kotlin-stdlib-jdk7:1.3.61
-org.jetbrains.kotlin:kotlin-stdlib:1.3.50
+org.jetbrains.kotlin:kotlin-stdlib-jdk8:1.3.61
-org.jetbrains.kotlin:kotlin-test-annotations-common:1.3.41
+org.jetbrains.kotlin:kotlin-stdlib:1.3.61
-org.jetbrains.kotlin:kotlin-test-common:1.3.41
+org.jetbrains.kotlin:kotlin-test-annotations-common:1.3.61
-org.jetbrains.kotlin:kotlin-test-junit5:1.3.41
+org.jetbrains.kotlin:kotlin-test-common:1.3.61
-org.jetbrains.kotlin:kotlin-test:1.3.41
+org.jetbrains.kotlin:kotlin-test-junit5:1.3.61
+org.jetbrains.kotlin:kotlin-test:1.3.61
 org.jetbrains:annotations:13.0
-org.junit.jupiter:junit-jupiter-api:5.4.2
+org.junit.jupiter:junit-jupiter-api:5.6.0
-org.junit.platform:junit-platform-commons:1.4.2
+org.junit.jupiter:junit-jupiter-params:5.6.0
+org.junit.platform:junit-platform-commons:1.6.0
+org.junit:junit-bom:5.6.0
 org.opentest4j:opentest4j:1.2.0

plugin/gradle/dependency-locks/compatTestRuntimeClasspath.lockfile

@@ -2,23 +2,29 @@
 # Manual edits can break the build and are not advised.
 # This file is expected to be part of source control.
 com.christophsturm:filepeek:0.1.1
-com.squareup.moshi:moshi:1.9.1
+com.squareup.moshi:moshi:1.9.2
-com.squareup.okio:okio:2.4.1
+com.squareup.okio:okio:2.4.3
-io.strikt:strikt-core:0.22.2
+dev.minutest:minutest:1.10.0
-org.apiguardian:apiguardian-api:1.0.0
+io.github.classgraph:classgraph:4.8.28
-org.jetbrains.kotlin:kotlin-reflect:1.3.50
+io.strikt:strikt-core:0.23.4
-org.jetbrains.kotlin:kotlin-stdlib-common:1.3.50
+net.swiftzer.semver:semver:1.1.1
-org.jetbrains.kotlin:kotlin-stdlib-jdk7:1.3.50
+org.apiguardian:apiguardian-api:1.1.0
-org.jetbrains.kotlin:kotlin-stdlib-jdk8:1.3.50
+org.jetbrains.kotlin:kotlin-reflect:1.3.61
-org.jetbrains.kotlin:kotlin-stdlib:1.3.50
+org.jetbrains.kotlin:kotlin-stdlib-common:1.3.61
-org.jetbrains.kotlin:kotlin-test-annotations-common:1.3.41
+org.jetbrains.kotlin:kotlin-stdlib-jdk7:1.3.61
-org.jetbrains.kotlin:kotlin-test-common:1.3.41
+org.jetbrains.kotlin:kotlin-stdlib-jdk8:1.3.61
-org.jetbrains.kotlin:kotlin-test-junit5:1.3.41
+org.jetbrains.kotlin:kotlin-stdlib:1.3.61
-org.jetbrains.kotlin:kotlin-test:1.3.41
+org.jetbrains.kotlin:kotlin-test-annotations-common:1.3.61
-org.jetbrains.kotlinx:kotlinx-coroutines-core:1.3.1
+org.jetbrains.kotlin:kotlin-test-common:1.3.61
+org.jetbrains.kotlin:kotlin-test-junit5:1.3.61
+org.jetbrains.kotlin:kotlin-test:1.3.61
+org.jetbrains.kotlinx:kotlinx-coroutines-core:1.3.3
 org.jetbrains:annotations:13.0
-org.junit.jupiter:junit-jupiter-api:5.4.2
+org.junit.jupiter:junit-jupiter-api:5.6.0
-org.junit.jupiter:junit-jupiter-engine:5.4.2
+org.junit.jupiter:junit-jupiter-engine:5.6.0
-org.junit.platform:junit-platform-commons:1.4.2
+org.junit.jupiter:junit-jupiter-params:5.6.0
-org.junit.platform:junit-platform-engine:1.4.2
+org.junit.platform:junit-platform-commons:1.6.0
+org.junit.platform:junit-platform-engine:1.6.0
+org.junit.platform:junit-platform-launcher:1.6.0
+org.junit:junit-bom:5.6.0
 org.opentest4j:opentest4j:1.2.0

plugin/gradle/dependency-locks/compileClasspath.lockfile

@@ -1,21 +1,15 @@
 # This is a Gradle generated file for dependency locking.
 # Manual edits can break the build and are not advised.
 # This file is expected to be part of source control.
-com.squareup.moshi:moshi:1.9.1
+com.squareup.moshi:moshi:1.9.2
-com.squareup.okio:okio:2.4.1
+com.squareup.okio:okio:1.16.0
-javax.inject:javax.inject:1
+org.apache.ivy:ivy:2.5.0
-org.apache.commons:commons-lang3:3.8.1
+org.apache.maven:maven-repository-metadata:3.6.3
-org.apache.maven:maven-artifact:3.6.2
-org.apache.maven:maven-builder-support:3.6.2
-org.apache.maven:maven-model-builder:3.6.2
-org.apache.maven:maven-model:3.6.2
-org.codehaus.plexus:plexus-interpolation:1.25
 org.codehaus.plexus:plexus-utils:3.2.1
-org.eclipse.sisu:org.eclipse.sisu.inject:0.3.3
+org.gradle:gradle-tooling-api:6.1
-org.gradle:gradle-tooling-api:5.6.3
+org.jetbrains.kotlin:kotlin-reflect:1.3.61
-org.jetbrains.kotlin:kotlin-reflect:1.3.41
+org.jetbrains.kotlin:kotlin-stdlib-common:1.3.61
-org.jetbrains.kotlin:kotlin-stdlib-common:1.3.50
+org.jetbrains.kotlin:kotlin-stdlib-jdk7:1.3.61
-org.jetbrains.kotlin:kotlin-stdlib-jdk7:1.3.41
+org.jetbrains.kotlin:kotlin-stdlib-jdk8:1.3.61
-org.jetbrains.kotlin:kotlin-stdlib-jdk8:1.3.41
+org.jetbrains.kotlin:kotlin-stdlib:1.3.61
-org.jetbrains.kotlin:kotlin-stdlib:1.3.50
 org.jetbrains:annotations:13.0

plugin/gradle/dependency-locks/runtimeClasspath.lockfile

@@ -1,17 +1,9 @@
 # This is a Gradle generated file for dependency locking.
 # Manual edits can break the build and are not advised.
 # This file is expected to be part of source control.
-com.squareup.moshi:moshi:1.9.1
+com.squareup.moshi:moshi:1.9.2
-com.squareup.okio:okio:2.4.1
+com.squareup.okio:okio:1.16.0
-javax.inject:javax.inject:1
+net.swiftzer.semver:semver:1.1.1
-org.apache.commons:commons-lang3:3.8.1
+org.apache.ivy:ivy:2.5.0
-org.apache.maven:maven-artifact:3.6.2
+org.apache.maven:maven-repository-metadata:3.6.3
-org.apache.maven:maven-builder-support:3.6.2
-org.apache.maven:maven-model-builder:3.6.2
-org.apache.maven:maven-model:3.6.2
-org.codehaus.plexus:plexus-interpolation:1.25
 org.codehaus.plexus:plexus-utils:3.2.1
-org.eclipse.sisu:org.eclipse.sisu.inject:0.3.3
-org.jetbrains.kotlin:kotlin-stdlib-common:1.3.50
-org.jetbrains.kotlin:kotlin-stdlib:1.3.50
-org.jetbrains:annotations:13.0

plugin/gradle/dependency-locks/testCompileClasspath.lockfile

@@ -1,20 +1,14 @@
 # This is a Gradle generated file for dependency locking.
 # Manual edits can break the build and are not advised.
 # This file is expected to be part of source control.
-com.squareup.moshi:moshi:1.9.1
+com.squareup.moshi:moshi:1.9.2
-com.squareup.okio:okio:2.4.1
+com.squareup.okio:okio:1.16.0
-javax.inject:javax.inject:1
+org.apache.ivy:ivy:2.5.0
-org.apache.commons:commons-lang3:3.8.1
+org.apache.maven:maven-repository-metadata:3.6.3
-org.apache.maven:maven-artifact:3.6.2
-org.apache.maven:maven-builder-support:3.6.2
-org.apache.maven:maven-model-builder:3.6.2
-org.apache.maven:maven-model:3.6.2
-org.codehaus.plexus:plexus-interpolation:1.25
 org.codehaus.plexus:plexus-utils:3.2.1
-org.eclipse.sisu:org.eclipse.sisu.inject:0.3.3
+org.jetbrains.kotlin:kotlin-reflect:1.3.61
-org.jetbrains.kotlin:kotlin-reflect:1.3.41
+org.jetbrains.kotlin:kotlin-stdlib-common:1.3.61
-org.jetbrains.kotlin:kotlin-stdlib-common:1.3.50
+org.jetbrains.kotlin:kotlin-stdlib-jdk7:1.3.61
-org.jetbrains.kotlin:kotlin-stdlib-jdk7:1.3.41
+org.jetbrains.kotlin:kotlin-stdlib-jdk8:1.3.61
-org.jetbrains.kotlin:kotlin-stdlib-jdk8:1.3.41
+org.jetbrains.kotlin:kotlin-stdlib:1.3.61
-org.jetbrains.kotlin:kotlin-stdlib:1.3.50
 org.jetbrains:annotations:13.0

plugin/gradle/dependency-locks/testRuntimeClasspath.lockfile

@@ -1,20 +1,15 @@
 # This is a Gradle generated file for dependency locking.
 # Manual edits can break the build and are not advised.
 # This file is expected to be part of source control.
-com.squareup.moshi:moshi:1.9.1
+com.squareup.moshi:moshi:1.9.2
-com.squareup.okio:okio:2.4.1
+com.squareup.okio:okio:1.16.0
-javax.inject:javax.inject:1
+net.swiftzer.semver:semver:1.1.1
-org.apache.commons:commons-lang3:3.8.1
+org.apache.ivy:ivy:2.5.0
-org.apache.maven:maven-artifact:3.6.2
+org.apache.maven:maven-repository-metadata:3.6.3
-org.apache.maven:maven-builder-support:3.6.2
-org.apache.maven:maven-model-builder:3.6.2
-org.apache.maven:maven-model:3.6.2
-org.codehaus.plexus:plexus-interpolation:1.25
 org.codehaus.plexus:plexus-utils:3.2.1
-org.eclipse.sisu:org.eclipse.sisu.inject:0.3.3
+org.jetbrains.kotlin:kotlin-reflect:1.3.61
-org.jetbrains.kotlin:kotlin-reflect:1.3.41
+org.jetbrains.kotlin:kotlin-stdlib-common:1.3.61
-org.jetbrains.kotlin:kotlin-stdlib-common:1.3.50
+org.jetbrains.kotlin:kotlin-stdlib-jdk7:1.3.61
-org.jetbrains.kotlin:kotlin-stdlib-jdk7:1.3.41
+org.jetbrains.kotlin:kotlin-stdlib-jdk8:1.3.61
-org.jetbrains.kotlin:kotlin-stdlib-jdk8:1.3.41
+org.jetbrains.kotlin:kotlin-stdlib:1.3.61
-org.jetbrains.kotlin:kotlin-stdlib:1.3.50
 org.jetbrains:annotations:13.0

plugin/src/compatTest/kotlin/org/nixos/gradle2nix/BasicTest.kt

@@ -1,97 +1,51 @@
 package org.nixos.gradle2nix
 
-import org.junit.jupiter.api.Test
+import dev.minutest.Tests
-import org.junit.jupiter.api.io.TempDir
+import dev.minutest.junit.JUnit5Minutests
-import java.io.File
+import dev.minutest.rootContext
-import kotlin.test.assertEquals
+import org.gradle.api.internal.artifacts.dsl.DefaultRepositoryHandler.BINTRAY_JCENTER_URL
+import org.gradle.api.internal.artifacts.dsl.DefaultRepositoryHandler.MAVEN_CENTRAL_URL
+import strikt.api.expectThat
+import strikt.assertions.all
+import strikt.assertions.containsExactly
+import strikt.assertions.get
+import strikt.assertions.hasSize
+import strikt.assertions.isEqualTo
+import strikt.assertions.map
+import strikt.assertions.startsWith
 
+class BasicTest : JUnit5Minutests {
+    @Tests
+    fun tests() = rootContext<Fixture>("basic tests") {
+        withFixture("basic/basic-java-project") {
+            test("builds basic java project") {
+                expectThat(build()) {
+                    get("gradle version") { gradle.version }.isEqualTo(System.getProperty("compat.gradle.version"))
 
-class BasicTest {
+                    get("root project dependencies") { rootProject.projectDependencies }.and {
-    @TempDir lateinit var projectDir: File
+                        ids.containsExactly(
+                            "com.squareup.moshi:moshi:1.8.0@jar",
+                            "com.squareup.moshi:moshi:1.8.0@pom",
+                            "com.squareup.moshi:moshi-parent:1.8.0@pom",
+                            "com.squareup.okio:okio:2.2.2@jar",
+                            "com.squareup.okio:okio:2.2.2@pom",
+                            "org.jetbrains:annotations:13.0@jar",
+                            "org.jetbrains:annotations:13.0@pom",
+                            "org.jetbrains.kotlin:kotlin-stdlib:1.2.60@jar",
+                            "org.jetbrains.kotlin:kotlin-stdlib:1.2.60@pom",
+                            "org.jetbrains.kotlin:kotlin-stdlib-common:1.2.60@jar",
+                            "org.jetbrains.kotlin:kotlin-stdlib-common:1.2.60@pom",
+                            "org.sonatype.oss:oss-parent:7@pom"
+                        )
 
-    @Test
+                        map { it.urls }.all {
-    fun `builds basic project with kotlin dsl`() {
+                            hasSize(2)
-        val model = projectDir.buildKotlin("""
+                            get(0).startsWith(BINTRAY_JCENTER_URL)
-            plugins {
+                            get(1).startsWith(MAVEN_CENTRAL_URL)
-                java
+                        }
+                    }
+                }
             }
-
-            repositories {
-                jcenter()
-            }
-
-            dependencies {
-                implementation("com.squareup.okio:okio:2.2.2")
-                implementation("com.squareup.moshi:moshi:1.8.0")
-            }
-        """.trimIndent())
-
-        assertEquals(model.gradle.version, System.getProperty("compat.gradle.version"))
-
-        with(model.rootProject.projectDependencies) {
-            with(repositories) {
-                assertEquals(1, maven.size)
-                assertEquals(maven[0].urls[0], "https://jcenter.bintray.com/")
-            }
-
-            assertArtifacts(
-                pom("com.squareup.moshi:moshi-parent:1.8.0"),
-                jar("com.squareup.moshi:moshi:1.8.0"),
-                pom("com.squareup.moshi:moshi:1.8.0"),
-                jar("com.squareup.okio:okio:2.2.2"),
-                pom("com.squareup.okio:okio:2.2.2"),
-                jar("org.jetbrains.kotlin:kotlin-stdlib-common:1.2.60"),
-                pom("org.jetbrains.kotlin:kotlin-stdlib-common:1.2.60"),
-                jar("org.jetbrains.kotlin:kotlin-stdlib:1.2.60"),
-                pom("org.jetbrains.kotlin:kotlin-stdlib:1.2.60"),
-                jar("org.jetbrains:annotations:13.0"),
-                pom("org.jetbrains:annotations:13.0"),
-                pom("org.sonatype.oss:oss-parent:7"),
-                actual = artifacts
-            )
-        }
-    }
-
-    @Test
-    fun `builds basic project with groovy dsl`() {
-        val model = projectDir.buildGroovy("""
-            plugins {
-                id("java")
-            }
-
-            repositories {
-                jcenter()
-            }
-
-            dependencies {
-                implementation 'com.squareup.okio:okio:2.2.2'
-                implementation 'com.squareup.moshi:moshi:1.8.0'
-            }
-        """.trimIndent())
-
-        assertEquals(model.gradle.version, System.getProperty("compat.gradle.version"))
-
-        with(model.rootProject.projectDependencies) {
-            with(repositories) {
-                assertEquals(1, maven.size)
-                assertEquals(maven[0].urls[0], "https://jcenter.bintray.com/")
-            }
-
-            assertArtifacts(
-                pom("com.squareup.moshi:moshi-parent:1.8.0"),
-                jar("com.squareup.moshi:moshi:1.8.0"),
-                pom("com.squareup.moshi:moshi:1.8.0"),
-                jar("com.squareup.okio:okio:2.2.2"),
-                pom("com.squareup.okio:okio:2.2.2"),
-                jar("org.jetbrains.kotlin:kotlin-stdlib-common:1.2.60"),
-                pom("org.jetbrains.kotlin:kotlin-stdlib-common:1.2.60"),
-                jar("org.jetbrains.kotlin:kotlin-stdlib:1.2.60"),
-                pom("org.jetbrains.kotlin:kotlin-stdlib:1.2.60"),
-                jar("org.jetbrains:annotations:13.0"),
-                pom("org.jetbrains:annotations:13.0"),
-                pom("org.sonatype.oss:oss-parent:7"),
-                actual = artifacts
-            )
         }
     }
 }

plugin/src/compatTest/kotlin/org/nixos/gradle2nix/DependencyTest.kt

@@ -0,0 +1,69 @@
+package org.nixos.gradle2nix
+
+import dev.minutest.Tests
+import dev.minutest.junit.JUnit5Minutests
+import dev.minutest.rootContext
+import strikt.api.expectThat
+import strikt.assertions.all
+import strikt.assertions.contains
+import strikt.assertions.containsExactly
+import strikt.assertions.filter
+import strikt.assertions.isEqualTo
+import strikt.assertions.isNotEqualTo
+import strikt.assertions.isNotNull
+import strikt.assertions.single
+import strikt.assertions.startsWith
+
+class DependencyTest : JUnit5Minutests {
+    @Tests
+    fun tests() = rootContext<Fixture>("dependency tests") {
+
+        withFixture("dependency/classifier") {
+            test("resolves dependency with classifier") {
+                expectThat(build()) {
+                    get("root project dependencies") { rootProject.projectDependencies }.ids.containsExactly(
+                        "com.badlogicgames.gdx:gdx-parent:1.9.9@pom",
+                        "com.badlogicgames.gdx:gdx-platform:1.9.9:natives-desktop@jar",
+                        "com.badlogicgames.gdx:gdx-platform:1.9.9@pom",
+                        "org.sonatype.oss:oss-parent:5@pom"
+                    )
+                }
+            }
+        }
+
+        withFixture("dependency/dynamic-snapshot") {
+            test("resolves snapshot dependency with dynamic version") {
+                expectThat(build()) {
+                    get("root project dependencies") { rootProject.projectDependencies }
+                        .filter { it.id.name == "packr" }
+                        .all {
+                            get("id.version") { id.version }.isEqualTo("-SNAPSHOT")
+                            get("timestamp") { timestamp }.isNotNull()
+                            get("build") { build }.isNotNull()
+                        }
+                }
+            }
+        }
+
+        withFixture("dependency/snapshot") {
+            test("resolves snapshot dependency") {
+                expectThat(build()) {
+                    get("root project dependencies") { rootProject.projectDependencies }
+                        .filter { it.id.name == "okio" }
+                        .and {
+                            ids.containsExactly(
+                                "com.squareup.okio:okio:2.5.0-SNAPSHOT@jar",
+                                "com.squareup.okio:okio:2.5.0-SNAPSHOT@module",
+                                "com.squareup.okio:okio:2.5.0-SNAPSHOT@pom"
+                            )
+                            all {
+                                get("timestamp") { timestamp }.isNotNull()
+                                get("build") { build }.isNotNull()
+                                get("urls") { urls }.single().startsWith(SONATYPE_OSS_URL)
+                            }
+                        }
+                }
+            }
+        }
+    }
+}

plugin/src/compatTest/kotlin/org/nixos/gradle2nix/IvyTest.kt

@@ -0,0 +1,33 @@
+package org.nixos.gradle2nix
+
+import dev.minutest.Tests
+import dev.minutest.junit.JUnit5Minutests
+import dev.minutest.rootContext
+import strikt.api.expectThat
+import strikt.assertions.all
+import strikt.assertions.containsExactly
+import strikt.assertions.map
+import strikt.assertions.single
+import strikt.assertions.startsWith
+
+class IvyTest : JUnit5Minutests {
+    @Tests
+    fun tests() = rootContext<Fixture>("ivy tests") {
+        withFixture("ivy/basic") {
+            test("resolves ivy dependencies") {
+                expectThat(build()) {
+                    get("root project dependencies") { rootProject.projectDependencies }.and {
+                        ids.containsExactly(
+                            "org.opendof.core-java:dof-cipher-sms4:1.0@jar",
+                            "org.opendof.core-java:dof-oal:7.0.2@jar"
+                        )
+
+                        map { it.urls }.all {
+                            single().startsWith("https://asset.opendof.org/artifact")
+                        }
+                    }
+                }
+            }
+        }
+    }
+}

plugin/src/compatTest/kotlin/org/nixos/gradle2nix/PluginTest.kt

@@ -0,0 +1,21 @@
+package org.nixos.gradle2nix
+
+import dev.minutest.Tests
+import dev.minutest.junit.JUnit5Minutests
+import dev.minutest.rootContext
+import strikt.api.expectThat
+import strikt.assertions.contains
+
+class PluginTest : JUnit5Minutests {
+    @Tests
+    fun tests() = rootContext<Fixture>("plugin tests") {
+        withFixture("plugin/resolves-from-default-repo") {
+            test("resolves plugin from default repo") {
+                expectThat(build()) {
+                    get("plugin dependencies") { pluginDependencies }.ids
+                        .contains("org.jetbrains.kotlin.jvm:org.jetbrains.kotlin.jvm.gradle.plugin:1.3.50@pom")
+                }
+            }
+        }
+    }
+}

plugin/src/compatTest/kotlin/org/nixos/gradle2nix/SubprojectsTest.kt

@@ -1,461 +1,151 @@
 package org.nixos.gradle2nix
 
-import org.junit.jupiter.api.Test
+import dev.minutest.Tests
-import org.junit.jupiter.api.io.TempDir
+import dev.minutest.junit.JUnit5Minutests
+import dev.minutest.rootContext
+import org.gradle.api.internal.artifacts.dsl.DefaultRepositoryHandler.BINTRAY_JCENTER_URL
 import strikt.api.expectThat
+import strikt.assertions.all
+import strikt.assertions.containsExactly
 import strikt.assertions.containsExactlyInAnyOrder
+import strikt.assertions.get
+import strikt.assertions.hasSize
+import strikt.assertions.isEqualTo
 import strikt.assertions.map
-import java.io.File
+import strikt.assertions.single
-import kotlin.test.assertEquals
+import strikt.assertions.startsWith
 
-class SubprojectsTest {
+class SubprojectsTest : JUnit5Minutests {
-    @TempDir
+    @Tests
-    lateinit var root: File
+    fun tests() = rootContext<Fixture>("subproject tests") {
+        withFixture("subprojects/multi-module") {
+            test("builds multi-module project") {
+                expectThat(build().rootProject) {
+                    get("root project dependencies") { projectDependencies }.and {
+                        ids.containsExactly(
+                            "junit:junit:4.12@jar",
+                            "junit:junit:4.12@pom",
+                            "org.hamcrest:hamcrest-core:1.3@jar",
+                            "org.hamcrest:hamcrest-core:1.3@pom",
+                            "org.hamcrest:hamcrest-parent:1.3@pom"
+                        )
+                        all {
+                            get("urls") { urls }.single().startsWith(BINTRAY_JCENTER_URL)
+                        }
+                    }
 
-    @Test
+                    get("children") { children }.and {
-    fun `builds multi-module project with kotlin dsl`() {
+                        hasSize(2)
-        root.resolve("child-a").also { it.mkdirs() }
-            .resolve("build.gradle.kts").writeText("""
-                plugins {
-                    java
-                }
 
-                dependencies {
+                        get(0).and {
-                    implementation("com.squareup.okio:okio:2.2.2")
+                            get("name") { name }.isEqualTo("child-a")
-                }
+                            get("projectDir") { projectDir }.isEqualTo("child-a")
-            """.trimIndent())
 
-        root.resolve("child-b").also { it.mkdirs() }
+                            get("child-a project dependencies") { projectDependencies }.and {
-            .resolve("build.gradle.kts").writeText("""
+                                ids.containsExactly(
-                plugins {
+                                    "com.squareup.okio:okio:2.2.2@jar",
-                    java
+                                    "com.squareup.okio:okio:2.2.2@pom",
-                }
+                                    "org.jetbrains:annotations:13.0@jar",
+                                    "org.jetbrains:annotations:13.0@pom",
+                                    "org.jetbrains.kotlin:kotlin-stdlib:1.2.60@jar",
+                                    "org.jetbrains.kotlin:kotlin-stdlib:1.2.60@pom",
+                                    "org.jetbrains.kotlin:kotlin-stdlib-common:1.2.60@jar",
+                                    "org.jetbrains.kotlin:kotlin-stdlib-common:1.2.60@pom"
+                                )
 
-                dependencies {
+                                all {
-                    implementation(project(":child-a"))
+                                    get("urls") { urls }.single().startsWith(BINTRAY_JCENTER_URL)
-                    implementation("com.squareup.moshi:moshi:1.8.0")
+                                }
-                }
+                            }
-            """.trimIndent())
+                        }
 
-        root.resolve("settings.gradle.kts").writeText("""
+                        get(1).and {
-            include(":child-a", ":child-b")
+                            get("name") { name }.isEqualTo("child-b")
-        """.trimIndent())
+                            get("projectDir") { projectDir }.isEqualTo("child-b")
 
-        val model = root.buildKotlin("""
+                            get("child-b project dependencies") { projectDependencies }.and {
-            plugins {
+                                ids.containsExactly(
-                java
+                                    "com.squareup.moshi:moshi:1.8.0@jar",
-            }
+                                    "com.squareup.moshi:moshi:1.8.0@pom",
+                                    "com.squareup.moshi:moshi-parent:1.8.0@pom",
+                                    "com.squareup.okio:okio:1.16.0@jar",        // compileClasspath
+                                    "com.squareup.okio:okio:1.16.0@pom",        // compileClasspath
+                                    "com.squareup.okio:okio:2.2.2@jar",         // runtimeClasspath
+                                    "com.squareup.okio:okio:2.2.2@pom",         // runtimeClasspath
+                                    "com.squareup.okio:okio-parent:1.16.0@pom", // compileClasspath
+                                    "org.jetbrains:annotations:13.0@jar",
+                                    "org.jetbrains:annotations:13.0@pom",
+                                    "org.jetbrains.kotlin:kotlin-stdlib:1.2.60@jar",
+                                    "org.jetbrains.kotlin:kotlin-stdlib:1.2.60@pom",
+                                    "org.jetbrains.kotlin:kotlin-stdlib-common:1.2.60@jar",
+                                    "org.jetbrains.kotlin:kotlin-stdlib-common:1.2.60@pom",
+                                    "org.sonatype.oss:oss-parent:7@pom"
+                                )
 
-            allprojects {
+                                all {
-                repositories {
+                                    get("urls") { urls }.single().startsWith(BINTRAY_JCENTER_URL)
-                    jcenter()
+                                }
+                            }
+                        }
+                    }
                 }
             }
 
-            dependencies {
+            test("builds single subproject") {
-                testImplementation("junit:junit:4.12")
+                expectThat(build(subprojects = listOf(":child-a")).rootProject) {
-            }
+                    get("root project dependencies") { projectDependencies }.and {
-        """.trimIndent())
+                        ids.containsExactly(
+                            "junit:junit:4.12@jar",
+                            "junit:junit:4.12@pom",
+                            "org.hamcrest:hamcrest-core:1.3@jar",
+                            "org.hamcrest:hamcrest-core:1.3@pom",
+                            "org.hamcrest:hamcrest-parent:1.3@pom"
+                        )
 
-        with(model.rootProject) {
+                        all {
-            with(projectDependencies) {
+                            get("urls") { urls }.single().startsWith(BINTRAY_JCENTER_URL)
-                assertEquals(listOf(DefaultMaven(urls = listOf("https://jcenter.bintray.com/"))),
+                        }
-                    repositories.maven)
+                    }
 
-                assertArtifacts(
+                    get("children") { children }.single().and {
-                    jar("junit:junit:4.12"),
+                        get("name") { name }.isEqualTo("child-a")
-                    pom("junit:junit:4.12"),
+                        get("projectDir") { projectDir }.isEqualTo("child-a")
-                    jar("org.hamcrest:hamcrest-core:1.3"),
-                    pom("org.hamcrest:hamcrest-core:1.3"),
-                    pom("org.hamcrest:hamcrest-parent:1.3"),
-                    actual = artifacts)
-            }
 
-            assertEquals(2, children.size)
+                        get("child-a project dependencies") { projectDependencies }.and {
+                            ids.containsExactly(
+                                "com.squareup.okio:okio:2.2.2@jar",
+                                "com.squareup.okio:okio:2.2.2@pom",
+                                "org.jetbrains:annotations:13.0@jar",
+                                "org.jetbrains:annotations:13.0@pom",
+                                "org.jetbrains.kotlin:kotlin-stdlib:1.2.60@jar",
+                                "org.jetbrains.kotlin:kotlin-stdlib:1.2.60@pom",
+                                "org.jetbrains.kotlin:kotlin-stdlib-common:1.2.60@jar",
+                                "org.jetbrains.kotlin:kotlin-stdlib-common:1.2.60@pom"
+                            )
 
-            with(children[0]) {
+                            all {
-                assertEquals("child-a", name)
+                                get("urls") { urls }.single().startsWith(BINTRAY_JCENTER_URL)
-                assertEquals(root.resolve("child-a").toRelativeString(root), projectDir)
+                            }
-
+                        }
-                with(projectDependencies) {
+                    }
-                    assertEquals(
-                        listOf(DefaultMaven(urls = listOf("https://jcenter.bintray.com/"))),
-                        repositories.maven
-                    )
-
-                    assertArtifacts(
-                        jar("com.squareup.okio:okio:2.2.2"),
-                        pom("com.squareup.okio:okio:2.2.2"),
-                        jar("org.jetbrains.kotlin:kotlin-stdlib-common:1.2.60"),
-                        pom("org.jetbrains.kotlin:kotlin-stdlib-common:1.2.60"),
-                        jar("org.jetbrains.kotlin:kotlin-stdlib:1.2.60"),
-                        pom("org.jetbrains.kotlin:kotlin-stdlib:1.2.60"),
-                        jar("org.jetbrains:annotations:13.0"),
-                        pom("org.jetbrains:annotations:13.0"),
-                        actual = artifacts
-                    )
-                }
-            }
-
-            with(children[1]) {
-                assertEquals("child-b", name)
-                assertEquals(root.resolve("child-b").toRelativeString(root), projectDir)
-
-                with(projectDependencies) {
-                    assertEquals(
-                        listOf(DefaultMaven(urls = listOf("https://jcenter.bintray.com/"))),
-                        repositories.maven
-                    )
-
-                    assertArtifacts(
-                        pom("com.squareup.moshi:moshi-parent:1.8.0"),
-                        jar("com.squareup.moshi:moshi:1.8.0"),
-                        pom("com.squareup.moshi:moshi:1.8.0"),
-                        pom("com.squareup.okio:okio-parent:1.16.0"),
-                        jar("com.squareup.okio:okio:1.16.0"),
-                        pom("com.squareup.okio:okio:1.16.0"),
-                        jar("com.squareup.okio:okio:2.2.2"),
-                        pom("com.squareup.okio:okio:2.2.2"),
-                        jar("org.jetbrains.kotlin:kotlin-stdlib-common:1.2.60"),
-                        pom("org.jetbrains.kotlin:kotlin-stdlib-common:1.2.60"),
-                        jar("org.jetbrains.kotlin:kotlin-stdlib:1.2.60"),
-                        pom("org.jetbrains.kotlin:kotlin-stdlib:1.2.60"),
-                        jar("org.jetbrains:annotations:13.0"),
-                        pom("org.jetbrains:annotations:13.0"),
-                        pom("org.sonatype.oss:oss-parent:7"),
-                        actual = artifacts
-                    )
                 }
             }
         }
-    }
 
-    @Test
+        withFixture("subprojects/dependent-subprojects") {
-    fun `builds multi-module project with groovy dsl`() {
+            test("includes dependent subprojects") {
-        root.resolve("child-a").also { it.mkdirs() }
+                expectThat(build(subprojects = listOf(":child-a"))) {
-            .resolve("build.gradle").writeText("""
+                    get("children") { rootProject.children }
-                plugins {
+                        .map { it.path }
-                    id 'java'
+                        .containsExactlyInAnyOrder(":child-a", ":child-b", ":child-c")
                 }
 
-                dependencies {
+                expectThat(build(subprojects = listOf(":child-b"))) {
-                    implementation 'com.squareup.okio:okio:2.2.2'
+                    get("children") { rootProject.children }
-                }
+                        .map { it.path }
-            """.trimIndent())
+                        .containsExactlyInAnyOrder(":child-b", ":child-c")
-
-        root.resolve("child-b").also { it.mkdirs() }
-            .resolve("build.gradle").writeText("""
-                plugins {
-                    id 'java'
-                }
-
-                dependencies {
-                    implementation project(':child-a')
-                    implementation 'com.squareup.moshi:moshi:1.8.0'
-                }
-            """.trimIndent())
-
-        root.resolve("settings.gradle").writeText("""
-            include ':child-a', ':child-b'
-        """.trimIndent())
-
-        val model = root.buildGroovy("""
-            plugins {
-                id 'java'
-            }
-
-            allprojects {
-                repositories {
-                    jcenter()
                 }
             }
-
-            dependencies {
-                testImplementation 'junit:junit:4.12'
-            }
-        """.trimIndent())
-
-        with(model.rootProject) {
-            with(projectDependencies) {
-                assertEquals(listOf(DefaultMaven(urls = listOf("https://jcenter.bintray.com/"))),
-                    repositories.maven)
-
-                assertArtifacts(
-                    jar("junit:junit:4.12"),
-                    pom("junit:junit:4.12"),
-                    jar("org.hamcrest:hamcrest-core:1.3"),
-                    pom("org.hamcrest:hamcrest-core:1.3"),
-                    pom("org.hamcrest:hamcrest-parent:1.3"),
-                    actual = artifacts)
-            }
-
-            assertEquals(2, children.size)
-
-            with(children[0]) {
-                assertEquals("child-a", name)
-                assertEquals(root.resolve("child-a").toRelativeString(root), projectDir)
-
-                with(projectDependencies) {
-                    assertEquals(
-                        listOf(DefaultMaven(urls = listOf("https://jcenter.bintray.com/"))),
-                        repositories.maven
-                    )
-
-                    assertArtifacts(
-                        jar("com.squareup.okio:okio:2.2.2"),
-                        pom("com.squareup.okio:okio:2.2.2"),
-                        jar("org.jetbrains.kotlin:kotlin-stdlib-common:1.2.60"),
-                        pom("org.jetbrains.kotlin:kotlin-stdlib-common:1.2.60"),
-                        jar("org.jetbrains.kotlin:kotlin-stdlib:1.2.60"),
-                        pom("org.jetbrains.kotlin:kotlin-stdlib:1.2.60"),
-                        jar("org.jetbrains:annotations:13.0"),
-                        pom("org.jetbrains:annotations:13.0"),
-                        actual = artifacts
-                    )
-                }
-            }
-
-            with(children[1]) {
-                assertEquals("child-b", name)
-                assertEquals(root.resolve("child-b").toRelativeString(root), projectDir)
-
-                with(projectDependencies) {
-                    assertEquals(listOf(DefaultMaven(urls = listOf("https://jcenter.bintray.com/"))),
-                        repositories.maven)
-
-                    assertArtifacts(
-                        pom("com.squareup.moshi:moshi-parent:1.8.0"),
-                        jar("com.squareup.moshi:moshi:1.8.0"),
-                        pom("com.squareup.moshi:moshi:1.8.0"),
-                        pom("com.squareup.okio:okio-parent:1.16.0"),
-                        jar("com.squareup.okio:okio:1.16.0"),
-                        pom("com.squareup.okio:okio:1.16.0"),
-                        jar("com.squareup.okio:okio:2.2.2"),
-                        pom("com.squareup.okio:okio:2.2.2"),
-                        jar("org.jetbrains.kotlin:kotlin-stdlib-common:1.2.60"),
-                        pom("org.jetbrains.kotlin:kotlin-stdlib-common:1.2.60"),
-                        jar("org.jetbrains.kotlin:kotlin-stdlib:1.2.60"),
-                        pom("org.jetbrains.kotlin:kotlin-stdlib:1.2.60"),
-                        jar("org.jetbrains:annotations:13.0"),
-                        pom("org.jetbrains:annotations:13.0"),
-                        pom("org.sonatype.oss:oss-parent:7"),
-                        actual = artifacts)
-                }
-            }
-        }
-    }
-
-    @Test
-    fun `builds single subproject in multi-module project with kotlin dsl`() {
-        root.resolve("child-a").also { it.mkdirs() }
-            .resolve("build.gradle.kts").writeText("""
-                plugins {
-                    java
-                }
-
-                dependencies {
-                    implementation("com.squareup.okio:okio:2.2.2")
-                }
-            """.trimIndent())
-
-        root.resolve("child-b").also { it.mkdirs() }
-            .resolve("build.gradle.kts").writeText("""
-                plugins {
-                    java
-                }
-
-                dependencies {
-                    implementation("com.squareup.moshi:moshi:1.8.0")
-                }
-            """.trimIndent())
-
-        root.resolve("settings.gradle.kts").writeText("""
-            include(":child-a", ":child-b")
-        """.trimIndent())
-
-        val model = root.buildKotlin("""
-            plugins {
-                java
-            }
-
-            allprojects {
-                repositories {
-                    jcenter()
-                }
-            }
-
-            dependencies {
-                testImplementation("junit:junit:4.12")
-            }
-        """.trimIndent(),
-            subprojects = listOf(":child-a"))
-
-        with(model.rootProject) {
-            with(projectDependencies) {
-                assertEquals(listOf(DefaultMaven(urls = listOf("https://jcenter.bintray.com/"))),
-                    repositories.maven)
-
-                assertArtifacts(
-                    jar("junit:junit:4.12"),
-                    pom("junit:junit:4.12"),
-                    jar("org.hamcrest:hamcrest-core:1.3"),
-                    pom("org.hamcrest:hamcrest-core:1.3"),
-                    pom("org.hamcrest:hamcrest-parent:1.3"),
-                    actual = artifacts)
-            }
-
-            assertEquals(1, children.size)
-
-            with(children[0]) {
-                assertEquals("child-a", name)
-                assertEquals(root.resolve("child-a").toRelativeString(root), projectDir)
-
-                with(projectDependencies) {
-                    assertEquals(
-                        listOf(DefaultMaven(urls = listOf("https://jcenter.bintray.com/"))),
-                        repositories.maven
-                    )
-
-                    assertArtifacts(
-                        jar("com.squareup.okio:okio:2.2.2"),
-                        pom("com.squareup.okio:okio:2.2.2"),
-                        jar("org.jetbrains.kotlin:kotlin-stdlib-common:1.2.60"),
-                        pom("org.jetbrains.kotlin:kotlin-stdlib-common:1.2.60"),
-                        jar("org.jetbrains.kotlin:kotlin-stdlib:1.2.60"),
-                        pom("org.jetbrains.kotlin:kotlin-stdlib:1.2.60"),
-                        jar("org.jetbrains:annotations:13.0"),
-                        pom("org.jetbrains:annotations:13.0"),
-                        actual = artifacts
-                    )
-                }
-            }
-        }
-    }
-
-    @Test
-    fun `builds single subproject in multi-module project with groovy dsl`() {
-        root.resolve("child-a").also { it.mkdirs() }
-            .resolve("build.gradle").writeText("""
-                plugins {
-                    id 'java'
-                }
-
-                dependencies {
-                    implementation 'com.squareup.okio:okio:2.2.2'
-                }
-            """.trimIndent())
-
-        root.resolve("child-b").also { it.mkdirs() }
-            .resolve("build.gradle").writeText("""
-                plugins {
-                    id 'java'
-                }
-
-                dependencies {
-                    implementation 'com.squareup.moshi:moshi:1.8.0'
-                }
-            """.trimIndent())
-
-        root.resolve("settings.gradle").writeText("""
-            include ':child-a', ':child-b'
-        """.trimIndent())
-
-        val model = root.buildGroovy("""
-            plugins {
-                id 'java'
-            }
-
-            allprojects {
-                repositories {
-                    jcenter()
-                }
-            }
-
-            dependencies {
-                testImplementation 'junit:junit:4.12'
-            }
-        """.trimIndent(),
-            subprojects = listOf(":child-a"))
-
-        with(model.rootProject) {
-            with(projectDependencies) {
-                assertEquals(listOf(DefaultMaven(urls = listOf("https://jcenter.bintray.com/"))),
-                    repositories.maven)
-
-                assertArtifacts(
-                    jar("junit:junit:4.12"),
-                    pom("junit:junit:4.12"),
-                    jar("org.hamcrest:hamcrest-core:1.3"),
-                    pom("org.hamcrest:hamcrest-core:1.3"),
-                    pom("org.hamcrest:hamcrest-parent:1.3"),
-                    actual = artifacts)
-            }
-
-            assertEquals(1, children.size)
-
-            with(children[0]) {
-                assertEquals("child-a", name)
-                assertEquals(root.resolve("child-a").toRelativeString(root), projectDir)
-
-                with(projectDependencies) {
-                    assertEquals(
-                        listOf(DefaultMaven(urls = listOf("https://jcenter.bintray.com/"))),
-                        repositories.maven
-                    )
-
-                    assertArtifacts(
-                        jar("com.squareup.okio:okio:2.2.2"),
-                        pom("com.squareup.okio:okio:2.2.2"),
-                        jar("org.jetbrains.kotlin:kotlin-stdlib-common:1.2.60"),
-                        pom("org.jetbrains.kotlin:kotlin-stdlib-common:1.2.60"),
-                        jar("org.jetbrains.kotlin:kotlin-stdlib:1.2.60"),
-                        pom("org.jetbrains.kotlin:kotlin-stdlib:1.2.60"),
-                        jar("org.jetbrains:annotations:13.0"),
-                        pom("org.jetbrains:annotations:13.0"),
-                        actual = artifacts
-                    )
-                }
-            }
-        }
-    }
-
-    @Test
-    fun `includes subproject dependencies`() {
-        root.resolve("child-a").also { it.mkdirs() }.resolve("build.gradle.kts").writeText("")
-        root.resolve("child-b").also { it.mkdirs() }.resolve("build.gradle.kts").writeText("")
-        root.resolve("child-c").also { it.mkdirs() }.resolve("build.gradle.kts").writeText("")
-        root.resolve("child-d").also { it.mkdirs() }.resolve("build.gradle.kts").writeText("")
-
-        root.resolve("settings.gradle.kts").writeText("""
-            include(":child-a", ":child-b", ":child-c", ":child-d")
-        """.trimIndent())
-
-        val buildscript = """
-            subprojects {
-                apply(plugin = "java")
-            }
-            
-            project(":child-a") {
-                dependencies {
-                    "implementation"(project(":child-b"))
-                }
-            }
-            
-            project(":child-b") {
-                dependencies {
-                    "implementation"(project(":child-c"))
-                }
-            }
-        """.trimIndent()
-
-        with(root.buildKotlin(buildscript, subprojects = listOf(":child-a"))) {
-            expectThat(rootProject.children).map { it.path }
-                .containsExactlyInAnyOrder(":child-a", ":child-b", ":child-c")
-        }
-
-        with(root.buildKotlin(buildscript, subprojects = listOf(":child-b"))) {
-            expectThat(rootProject.children).map { it.path }.containsExactlyInAnyOrder(":child-b", ":child-c")
         }
     }
 }
-

plugin/src/compatTest/kotlin/org/nixos/gradle2nix/TestUtil.kt

@@ -1,20 +1,33 @@
 package org.nixos.gradle2nix
 
 import com.squareup.moshi.Moshi
+import dev.minutest.ContextBuilder
+import dev.minutest.MinutestFixture
+import dev.minutest.TestContextBuilder
 import okio.buffer
 import okio.source
-import org.gradle.api.internal.artifacts.dsl.ParsedModuleStringNotation
 import org.gradle.internal.classpath.DefaultClassPath
 import org.gradle.testkit.runner.GradleRunner
-import org.gradle.testkit.runner.internal.DefaultGradleRunner
 import org.gradle.testkit.runner.internal.PluginUnderTestMetadataReading
-import org.gradle.tooling.GradleConnector
+import org.gradle.util.GradleVersion
-import org.gradle.tooling.events.ProgressListener
+import org.junit.jupiter.api.Assumptions.assumeTrue
+import strikt.api.Assertion
+import strikt.assertions.map
 import java.io.File
-import kotlin.test.assertTrue
+import java.io.StringWriter
+import java.nio.file.Files
+import java.nio.file.Path
+import java.nio.file.Paths
+import kotlin.streams.toList
+
+const val SONATYPE_OSS_URL = "https://oss.sonatype.org/content/repositories/snapshots/"
 
 private val moshi = Moshi.Builder().build()
 
+private val gradleVersion = GradleVersion.version(System.getProperty("compat.gradle.version"))
+
+val GRADLE_4_5 = GradleVersion.version("4.5")
+
 private fun File.initscript() = resolve("init.gradle").also {
     it.writer().use { out ->
         val classpath = DefaultClassPath.of(PluginUnderTestMetadataReading.readImplementationClasspath())
@@ -31,20 +44,12 @@ private fun File.initscript() = resolve("init.gradle").also {
      }
 }
 
-fun File.buildGroovy(
-    script: String,
-    configurations: List<String> = emptyList(),
-    subprojects: List<String> = emptyList()
-): DefaultBuild {
-    resolve("build.gradle").writeText(script)
-    return build(configurations, subprojects)
-}
-
 fun File.buildKotlin(
     script: String,
     configurations: List<String> = emptyList(),
     subprojects: List<String> = emptyList()
 ): DefaultBuild {
+    assumeTrue(gradleVersion >= GRADLE_4_5)
     resolve("build.gradle.kts").writeText(script)
     return build(configurations, subprojects)
 }
@@ -53,10 +58,13 @@ private fun File.build(
     configurations: List<String>,
     subprojects: List<String>
 ): DefaultBuild {
-    GradleRunner.create()
+    val log = StringWriter()
-        .withGradleVersion(System.getProperty("compat.gradle.version"))
+
+    val result = GradleRunner.create()
+        .withGradleVersion(gradleVersion.version)
         .withProjectDir(this)
-        .forwardOutput()
+        .forwardStdOutput(log)
+        .forwardStdError(log)
         .withArguments(
             "nixModel",
             "--init-script=${initscript()}",
@@ -64,8 +72,12 @@ private fun File.build(
             "-Porg.nixos.gradle2nix.configurations=${configurations.joinToString(",")}",
             "-Porg.nixos.gradle2nix.subprojects=${subprojects.joinToString(",")}"
         )
-        .build()
+        .runCatching { build() }
 
+    result.onFailure { error ->
+        System.err.print(log)
+        throw error
+    }
     return resolve("build/nix/model.json").run {
         println(readText())
         source().buffer().use { src ->
@@ -73,75 +85,48 @@ private fun File.build(
         }
     }
 }
-//
-//    return GradleConnector.newConnector()
-//        .useGradleVersion(System.getProperty("compat.gradle.version"))
-//        .forProjectDirectory(this)
-//        .connect()
-//        .model(Build::class.java).apply {
-//            addArguments("--init-script=${initscript()}", "--stacktrace")
-//            addJvmArguments(
-//                "-Dorg.gradle.debug=true",
-//                "-Dorg.nixos.gradle2nix.configurations=${configurations.joinToString(",")}",
-//                "-Dorg.nixos.gradle2nix.subprojects=${subprojects.joinToString(",")}"
-//            )
-//            setStandardOutput(System.out)
-//            setStandardError(System.out)
-//        }
-//        .get()
-//        .let { DefaultBuild(it) }
 
-fun jar(notation: String, sha256: String = ""): DefaultArtifact =
+val <T : Iterable<Artifact>> Assertion.Builder<T>.ids: Assertion.Builder<Iterable<String>>
-        artifact(notation, sha256, "jar")
+    get() = map { it.id.toString() }
 
-fun pom(notation: String, sha256: String = ""): DefaultArtifact =
+@MinutestFixture
-        artifact(notation, sha256, "pom")
+class Fixture(val testRoots: List<Path>)
 
-private fun artifact(notation: String, sha256: String, type: String): DefaultArtifact {
+@MinutestFixture
-    val parsed = ParsedModuleStringNotation(notation, type)
+class ProjectFixture(val testRoot: Path) {
-    return DefaultArtifact(
+    fun build(
-        groupId = parsed.group ?: "",
+        configurations: List<String> = emptyList(),
-        artifactId = parsed.name ?: "",
+        subprojects: List<String> = emptyList()
-        version = parsed.version ?: "",
+    ) = testRoot.toFile().build(configurations, subprojects)
-        classifier = parsed.classifier ?: "",
-        extension = type,
-        sha256 = sha256
-    )
 }
 
-private fun artifactEquals(expected: DefaultArtifact, actual: DefaultArtifact?): Boolean {
+fun ContextBuilder<Fixture>.withFixture(
-    return actual != null && with (expected) {
+    name: String,
-        groupId == actual.groupId &&
+    block: TestContextBuilder<Fixture, ProjectFixture>.() -> Unit
-                artifactId == actual.artifactId &&
+) = context(name) {
-                version == actual.version &&
+    val url = checkNotNull(Thread.currentThread().contextClassLoader.getResource(name)?.toURI()) {
-                classifier == actual.classifier &&
+        "$name: No test fixture found"
-                extension == actual.extension &&
-                (sha256.takeIf { it.isNotEmpty() }?.equals(actual.sha256) ?: true)
     }
-}
+    val fixtureRoot = Paths.get(url)
+    val dest = createTempDir("gradle2nix").toPath()
+    val src = checkNotNull(fixtureRoot.takeIf(Files::exists)) {
+        "$name: Test fixture not found: $fixtureRoot}"
+    }
+    src.toFile().copyRecursively(dest.toFile())
+    val testRoots = Files.list(dest).filter { Files.isDirectory(it) }.toList()
 
-fun assertArtifacts(vararg expected: DefaultArtifact, actual: List<DefaultArtifact>) {
+    fixture {
-    val mismatches = mutableListOf<Mismatch>()
+        Fixture(testRoots)
-    val remaining = mutableListOf<DefaultArtifact>().also { it.addAll(actual) }
+    }
-    expected.forEachIndexed { i: Int, exp: DefaultArtifact ->
+
-        val act = actual.elementAtOrNull(i)
+    afterAll {
-        if (!artifactEquals(exp, act)) {
+        dest.toFile().deleteRecursively()
-            mismatches += Mismatch(i, exp, act)
+    }
-        } else if (act != null) {
+
-            remaining -= act
+    testRoots.forEach { testRoot ->
+        derivedContext<ProjectFixture>(testRoot.fileName.toString()) {
+            deriveFixture { ProjectFixture(testRoot) }
+            block()
         }
     }
-    assertTrue(mismatches.isEmpty() && remaining.isEmpty(), """
-        Artifact mismatches:
-        ${mismatches.joinToString("\n            ", prefix = "    ")}
-
-        Missing artifacts:
-        ${remaining.joinToString("\n            ", prefix = "    ")}
-    """)
 }
-
-data class Mismatch(
-    val index: Int,
-    val expected: DefaultArtifact,
-    val actual: DefaultArtifact?
-)

plugin/src/compatTest/kotlin/org/nixos/gradle2nix/WrapperTest.kt

@@ -1,22 +1,25 @@
 package org.nixos.gradle2nix
 
-import org.junit.jupiter.api.Test
+import dev.minutest.Tests
-import org.junit.jupiter.api.io.TempDir
+import dev.minutest.junit.JUnit5Minutests
+import dev.minutest.rootContext
+import strikt.api.expectThat
+import strikt.assertions.isEqualTo
 import java.io.File
-import kotlin.test.assertEquals
 
-class WrapperTest {
+class WrapperTest : JUnit5Minutests {
-    @TempDir
+    @Tests
-    lateinit var root: File
+    fun tests() = rootContext<File>("wrapper tests") {
+        fixture { createTempDir("gradle2nix") }
 
-    @Test
+        test("resolves gradle wrapper version") {
-    fun `resolves gradle version from wrapper configuration`() {
+            expectThat(buildKotlin("""
-        val model = root.buildKotlin("""
+                tasks.withType<org.gradle.api.tasks.wrapper.Wrapper> {
-            tasks.withType<org.gradle.api.tasks.wrapper.Wrapper> {
+                    gradleVersion = "5.5.1"
-                gradleVersion = "5.5.1"
+                }
+            """.trimIndent())) {
+                get("gradle version") { gradle.version }.isEqualTo("5.5.1")
             }
-        """.trimIndent())
+        }
-
-        assertEquals(model.gradle.version, "5.5.1")
     }
 }

plugin/src/main/kotlin/org/nixos/gradle2nix/ConfigurationResolver.kt

@@ -0,0 +1,255 @@
+package org.nixos.gradle2nix
+
+import org.apache.ivy.Ivy
+import org.apache.ivy.core.settings.IvySettings
+import org.apache.ivy.plugins.parser.m2.PomReader
+import org.apache.ivy.plugins.parser.xml.XmlModuleDescriptorParser
+import org.apache.ivy.plugins.repository.url.URLResource
+import org.apache.ivy.plugins.resolver.ChainResolver
+import org.gradle.api.artifacts.Configuration
+import org.gradle.api.artifacts.ModuleIdentifier
+import org.gradle.api.artifacts.ResolvedArtifact
+import org.gradle.api.artifacts.component.ComponentArtifactIdentifier
+import org.gradle.api.artifacts.component.ModuleComponentIdentifier
+import org.gradle.api.artifacts.dsl.DependencyHandler
+import org.gradle.api.artifacts.dsl.RepositoryHandler
+import org.gradle.api.artifacts.query.ArtifactResolutionQuery
+import org.gradle.api.artifacts.result.ResolvedArtifactResult
+import org.gradle.api.internal.artifacts.repositories.ResolutionAwareRepository
+import org.gradle.ivy.IvyDescriptorArtifact
+import org.gradle.ivy.IvyModule
+import org.gradle.kotlin.dsl.getArtifacts
+import org.gradle.kotlin.dsl.withArtifacts
+import org.gradle.maven.MavenModule
+import org.gradle.maven.MavenPomArtifact
+import org.gradle.util.GradleVersion
+import java.io.File
+
+internal class ConfigurationResolverFactory(repositories: RepositoryHandler) {
+    private val ivySettings = IvySettings().apply {
+        defaultInit()
+        setDefaultRepositoryCacheBasedir(createTempDir("gradle2nix-cache").apply(File::deleteOnExit).absolutePath)
+        setDictatorResolver(ChainResolver().also { chain ->
+            chain.settings = this@apply
+            for (resolver in resolvers) chain.add(resolver)
+        })
+    }
+
+    private val resolvers = repositories.filterIsInstance<ResolutionAwareRepository>()
+        .mapNotNull { it.repositoryResolver(ivySettings) }
+
+    fun create(dependencies: DependencyHandler): ConfigurationResolver =
+        ConfigurationResolver(ivySettings, resolvers, dependencies)
+}
+
+internal class ConfigurationResolver(
+    ivySettings: IvySettings,
+    private val resolvers: List<RepositoryResolver>,
+    private val dependencies: DependencyHandler
+) {
+    private val ivy = Ivy.newInstance(ivySettings)
+
+    fun resolve(configuration: Configuration): List<DefaultArtifact> {
+        val resolved = configuration.resolvedConfiguration
+
+        val topLevelMetadata = resolved.firstLevelModuleDependencies
+            .flatMap { resolveMetadata(it.moduleGroup, it.moduleName, it.moduleVersion) }
+
+        val allArtifacts = resolved.resolvedArtifacts
+            .filter { it.id.componentIdentifier is ModuleComponentIdentifier }
+            .flatMap(::resolve)
+
+        return (topLevelMetadata + allArtifacts).filter { it.urls.isNotEmpty() }
+    }
+
+    private fun resolve(resolvedArtifact: ResolvedArtifact): List<DefaultArtifact> {
+        val componentId = resolvedArtifact.id.componentIdentifier as ModuleComponentIdentifier
+
+        val artifactId = DefaultArtifactIdentifier(
+            group = componentId.group,
+            name = componentId.module,
+            version = componentId.version,
+            type = resolvedArtifact.type,
+            extension = resolvedArtifact.extension,
+            classifier = resolvedArtifact.classifier
+        )
+
+        val sha256 = resolvedArtifact.file.sha256()
+        val artifacts = resolvers.mapNotNull { it.resolve(artifactId, sha256) }.merge()
+        return artifacts + componentId.run { resolveMetadata(group, module, version) }
+    }
+
+    private fun resolveMetadata(
+        group: String,
+        name: String,
+        version: String
+    ): List<DefaultArtifact> {
+        return resolvePoms(group, name, version) +
+            resolveDescriptors(group, name, version) +
+            resolveGradleMetadata(group, name, version)
+    }
+
+    private fun resolvePoms(
+        group: String,
+        name: String,
+        version: String
+    ): List<DefaultArtifact> {
+        return dependencies.createArtifactResolutionQuery()
+            .forModuleCompat(group, name, version)
+            .withArtifacts(MavenModule::class, MavenPomArtifact::class)
+            .execute()
+            .resolvedComponents
+            .flatMap { it.getArtifacts(MavenPomArtifact::class) }
+            .filterIsInstance<ResolvedArtifactResult>()
+            .flatMap { it.withParentPoms() }
+            .flatMap { resolvedPom ->
+                val componentId = resolvedPom.id.componentIdentifier as ModuleComponentIdentifier
+                val artifactId = DefaultArtifactIdentifier(
+                    group = componentId.group,
+                    name = componentId.module,
+                    version = componentId.version,
+                    type = "pom"
+                )
+                val sha256 = resolvedPom.file.sha256()
+                resolvers.mapNotNull { it.resolve(artifactId, sha256) }.merge()
+            }
+    }
+
+    private fun resolveDescriptors(
+        group: String,
+        name: String,
+        version: String
+    ): List<DefaultArtifact> {
+        return dependencies.createArtifactResolutionQuery()
+            .forModuleCompat(group, name, version)
+            .withArtifacts(IvyModule::class, IvyDescriptorArtifact::class)
+            .execute()
+            .resolvedComponents
+            .flatMap { it.getArtifacts(IvyDescriptorArtifact::class) }
+            .filterIsInstance<ResolvedArtifactResult>()
+            .flatMap { it.withParentDescriptors() }
+            .flatMap { resolvedDesc ->
+                val componentId = resolvedDesc.id.componentIdentifier as ModuleComponentIdentifier
+                val artifactId = DefaultArtifactIdentifier(
+                    group = componentId.group,
+                    name = componentId.module,
+                    version = componentId.version,
+                    type = "ivy",
+                    extension = "xml"
+                )
+                val sha256 = resolvedDesc.file.sha256()
+                resolvers.mapNotNull { it.resolve(artifactId, sha256) }.merge()
+            }
+    }
+
+    private fun resolveGradleMetadata(
+        group: String,
+        name: String,
+        version: String
+    ): List<DefaultArtifact> {
+        val artifactId = DefaultArtifactIdentifier(
+            group = group,
+            name = name,
+            version = version,
+            type = "module"
+        )
+        return resolvers.mapNotNull { it.resolve(artifactId) }.merge()
+    }
+
+    private fun ResolvedArtifactResult.parentPom(): ResolvedArtifactResult? {
+        val resource = URLResource(file.toURI().toURL())
+        val reader = PomReader(resource.url, resource)
+
+        return if (reader.hasParent()) {
+            dependencies.createArtifactResolutionQuery()
+                .forModuleCompat(reader.parentGroupId, reader.parentArtifactId, reader.parentVersion)
+                .withArtifacts(MavenModule::class, MavenPomArtifact::class)
+                .execute()
+                .resolvedComponents
+                .flatMap { it.getArtifacts(MavenPomArtifact::class) }
+                .filterIsInstance<ResolvedArtifactResult>()
+                .firstOrNull()
+        } else {
+            null
+        }
+    }
+
+    private fun ResolvedArtifactResult.withParentPoms(): List<ResolvedArtifactResult> =
+        generateSequence(this) { it.parentPom() }.toList()
+
+    private fun ResolvedArtifactResult.parentDescriptors(seen: Set<ComponentArtifactIdentifier>): List<ResolvedArtifactResult> {
+        val url = file.toURI().toURL()
+        val parser = XmlModuleDescriptorParser.getInstance()
+
+        val descriptor = parser.parseDescriptor(ivy.settings, url, false)
+
+        return descriptor.inheritedDescriptors.mapNotNull { desc ->
+            dependencies.createArtifactResolutionQuery()
+                .forModuleCompat(
+                    desc.parentRevisionId.organisation,
+                    desc.parentRevisionId.name,
+                    desc.parentRevisionId.revision
+                )
+                .withArtifacts(IvyModule::class, IvyDescriptorArtifact::class)
+                .execute()
+                .resolvedComponents
+                .flatMap { it.getArtifacts(IvyDescriptorArtifact::class) }
+                .filterIsInstance<ResolvedArtifactResult>()
+                .firstOrNull()
+        }.filter { it.id !in seen }
+    }
+
+    private fun ResolvedArtifactResult.withParentDescriptors(): List<ResolvedArtifactResult> {
+        val seen = mutableSetOf<ComponentArtifactIdentifier>()
+        return generateSequence(listOf(this)) { descs ->
+            val parents = descs.flatMap { it.parentDescriptors(seen) }
+            seen.addAll(parents.map(ResolvedArtifactResult::id))
+            parents.takeUnless { it.isEmpty() }
+        }.flatten().distinct().toList()
+    }
+}
+
+private fun ArtifactResolutionQuery.forModuleCompat(
+    group: String,
+    name: String,
+    version: String
+): ArtifactResolutionQuery {
+    return if (GradleVersion.current() >= GradleVersion.version("4.5")) {
+        forModule(group, name, version)
+    } else {
+        forComponents(ModuleComponentId(group, name, version))
+    }
+}
+
+private data class ModuleComponentId(
+    private val moduleId: ModuleId,
+    private val version: String
+) : ModuleComponentIdentifier {
+
+    constructor(
+        group: String,
+        name: String,
+        version: String
+    ) : this(ModuleId(group, name), version)
+
+    override fun getGroup(): String = moduleId.group
+    override fun getModule(): String = moduleId.name
+    override fun getVersion(): String = version
+    override fun getModuleIdentifier(): ModuleIdentifier = moduleId
+    override fun getDisplayName(): String =
+        arrayOf(group, module, version).joinToString(":")
+}
+
+private data class ModuleId(
+    private val group: String,
+    private val name: String
+) : ModuleIdentifier {
+    override fun getGroup(): String = group
+    override fun getName(): String = name
+}
+
+private fun List<DefaultArtifact>.merge(): List<DefaultArtifact> {
+    return groupingBy { it.id }
+        .reduce { _, dest, next -> dest.copy(urls = dest.urls + next.urls) }
+        .values.toList()
+}

plugin/src/main/kotlin/org/nixos/gradle2nix/DependencyResolver.kt

@@ -1,169 +0,0 @@
-package org.nixos.gradle2nix
-
-import org.apache.maven.model.Parent
-import org.apache.maven.model.Repository
-import org.apache.maven.model.building.DefaultModelBuilderFactory
-import org.apache.maven.model.building.DefaultModelBuildingRequest
-import org.apache.maven.model.building.ModelBuildingRequest
-import org.apache.maven.model.building.ModelSource2
-import org.apache.maven.model.resolution.ModelResolver
-import org.gradle.api.artifacts.Configuration
-import org.gradle.api.artifacts.ConfigurationContainer
-import org.gradle.api.artifacts.Dependency
-import org.gradle.api.artifacts.component.ModuleComponentIdentifier
-import org.gradle.api.artifacts.component.ProjectComponentIdentifier
-import org.gradle.api.artifacts.dsl.DependencyHandler
-import org.gradle.api.artifacts.result.ResolvedArtifactResult
-import org.gradle.api.logging.Logger
-import org.gradle.api.logging.Logging
-import org.gradle.maven.MavenModule
-import org.gradle.maven.MavenPomArtifact
-import java.io.File
-import java.io.InputStream
-import java.net.URI
-import java.security.MessageDigest
-
-internal class DependencyResolver(
-    private val configurations: ConfigurationContainer,
-    private val dependencies: DependencyHandler,
-    private val logger: Logger = Logging.getLogger(DependencyResolver::class.simpleName)
-) {
-    private val mavenPomResolver = MavenPomResolver(configurations, dependencies)
-
-    fun resolveDependencies(configuration: Configuration): Set<DefaultArtifact> {
-        if (!configuration.isCanBeResolved) {
-            logger.warn("Cannot resolve configuration ${configuration.name}; ignoring.")
-            return emptySet()
-        }
-        return configuration.resolvedConfiguration.resolvedArtifacts
-            .filterNot { it.id.componentIdentifier is ProjectComponentIdentifier }
-            .mapTo(sortedSetOf()) {
-                with (it) {
-                    DefaultArtifact(
-                        groupId = moduleVersion.id.group,
-                        artifactId = moduleVersion.id.name,
-                        version = moduleVersion.id.version,
-                        classifier = classifier ?: "",
-                        extension = extension,
-                        sha256 = sha256(file)
-                    )
-                }
-        }
-    }
-
-    fun resolveDependencies(
-        dependencies: Collection<Dependency>,
-        includeTransitive: Boolean = false
-    ): Set<DefaultArtifact> {
-        val configuration = configurations.detachedConfiguration(*(dependencies.toTypedArray()))
-        configuration.isTransitive = includeTransitive
-        return resolveDependencies(configuration)
-    }
-
-    fun resolvePoms(configuration: Configuration): Set<DefaultArtifact> {
-        return dependencies.createArtifactResolutionQuery()
-            .forComponents(configuration.incoming.resolutionResult.allComponents.map { it.id })
-            .withArtifacts(MavenModule::class.java, MavenPomArtifact::class.java)
-            .execute()
-            .resolvedComponents.asSequence()
-            .flatMap { component ->
-                val id = component.id
-                if (id !is ModuleComponentIdentifier) {
-                    emptySequence()
-                } else {
-                    component.getArtifacts(MavenPomArtifact::class.java).asSequence()
-                        .filterIsInstance<ResolvedArtifactResult>()
-                        .map { id to it }
-                }
-            }
-            .flatMapTo(sortedSetOf()) { (id, artifact) ->
-                sequenceOf(DefaultArtifact(
-                    groupId = id.group,
-                    artifactId = id.module,
-                    version = id.version,
-                    classifier = "",
-                    extension = artifact.file.extension,
-                    sha256 = sha256(artifact.file)
-                )) + mavenPomResolver.resolve(artifact.file).asSequence()
-            }
-    }
-
-    fun resolvePoms(
-        dependencies: Collection<Dependency>,
-        includeTransitive: Boolean = false
-    ): Set<DefaultArtifact> {
-        val configuration = configurations.detachedConfiguration(*(dependencies.toTypedArray()))
-        configuration.isTransitive = includeTransitive
-        return resolvePoms(configuration)
-    }
-}
-
-private class MavenPomResolver(
-    private val configurations: ConfigurationContainer,
-    private val dependencies: DependencyHandler
-) : ModelResolver {
-    private val modelBuilder = DefaultModelBuilderFactory().newInstance()
-    private val resolvedDependencies = mutableSetOf<DefaultArtifact>()
-
-    @Synchronized
-    fun resolve(pom: File): Set<DefaultArtifact> {
-        resolvedDependencies.clear()
-        modelBuilder.build(
-            DefaultModelBuildingRequest()
-                .setModelResolver(this)
-                .setPomFile(pom)
-                .setSystemProperties(System.getProperties())
-                .setValidationLevel(ModelBuildingRequest.VALIDATION_LEVEL_MINIMAL)
-        ).effectiveModel
-        return resolvedDependencies.toSet()
-    }
-
-    override fun newCopy() = this
-
-    override fun resolveModel(
-        groupId: String,
-        artifactId: String,
-        version: String
-    ): ModelSource2 {
-        val file = configurations
-            .detachedConfiguration(dependencies.create("$groupId:$artifactId:$version@pom"))
-            .singleFile
-        resolvedDependencies.add(DefaultArtifact(
-            groupId = groupId,
-            artifactId = artifactId,
-            version = version,
-            classifier = "",
-            extension = file.extension,
-            sha256 = sha256(file)
-        ))
-
-        return object : ModelSource2 {
-            override fun getLocation(): String = file.absolutePath
-            override fun getLocationURI(): URI = file.absoluteFile.toURI()
-            override fun getRelatedSource(relPath: String?): ModelSource2? = null
-            override fun getInputStream(): InputStream = file.inputStream()
-        }
-    }
-
-    override fun resolveModel(parent: Parent): ModelSource2 =
-        resolveModel(parent.groupId, parent.artifactId, parent.version)
-
-    override fun resolveModel(dependency: org.apache.maven.model.Dependency): ModelSource2 =
-        resolveModel(dependency.groupId, dependency.artifactId, dependency.version)
-
-    override fun addRepository(repository: Repository) {}
-
-    override fun addRepository(repository: Repository, replace: Boolean) {}
-}
-
-private const val HEX = "0123456789abcdef"
-
-private fun sha256(file: File): String = buildString {
-    MessageDigest.getInstance("SHA-256").digest(file.readBytes())
-        .asSequence()
-        .map { it.toInt() }
-        .forEach {
-            append(HEX[it shr 4 and 0x0f])
-            append(HEX[it and 0x0f])
-        }
-}

plugin/src/main/kotlin/org/nixos/gradle2nix/Gradle2NixPlugin.kt

@@ -1,19 +1,16 @@
 package org.nixos.gradle2nix
 
 import com.squareup.moshi.Moshi
-import okio.buffer
-import okio.sink
 import org.gradle.api.Plugin
 import org.gradle.api.Project
-import org.gradle.api.artifacts.ArtifactRepositoryContainer
+import org.gradle.api.Task
 import org.gradle.api.artifacts.Configuration
 import org.gradle.api.artifacts.ProjectDependency
-import org.gradle.api.artifacts.dsl.RepositoryHandler
-import org.gradle.api.artifacts.repositories.MavenArtifactRepository
-import org.gradle.api.internal.GradleInternal
 import org.gradle.api.invocation.Gradle
+import org.gradle.api.tasks.TaskContainer
 import org.gradle.api.tasks.wrapper.Wrapper
 import org.gradle.kotlin.dsl.getByName
+import org.gradle.kotlin.dsl.newInstance
 import org.gradle.kotlin.dsl.support.serviceOf
 import org.gradle.kotlin.dsl.withType
 import org.gradle.plugin.management.PluginRequest
@@ -33,15 +30,17 @@ open class Gradle2NixPlugin : Plugin<Gradle> {
             rootProject.serviceOf<ToolingModelBuilderRegistry>()
                 .register(NixToolingModelBuilder(modelProperties, pluginRequests))
 
-            rootProject.tasks.register("nixModel") {
+            rootProject.tasks.registerCompat("nixModel") {
                 doLast {
                     val outFile = project.mkdir(project.buildDir.resolve("nix")).resolve("model.json")
                     val model = project.buildModel(modelProperties, pluginRequests)
-                    outFile.sink().buffer().use { out ->
+                    outFile.bufferedWriter().use { out ->
-                        Moshi.Builder().build()
+                        out.write(
-                            .adapter(DefaultBuild::class.java)
+                            Moshi.Builder().build()
-                            .indent("  ")
+                                .adapter(DefaultBuild::class.java)
-                            .toJson(out, model)
+                                .indent("  ")
+                                .toJson(model)
+                        )
                         out.flush()
                     }
                 }
@@ -50,7 +49,13 @@ open class Gradle2NixPlugin : Plugin<Gradle> {
     }
 }
 
-private const val NIX_MODEL_NAME = "org.nixos.gradle2nix.Build"
+private fun TaskContainer.registerCompat(name: String, configureAction: Task.() -> Unit) {
+    if (GradleVersion.current() >= GradleVersion.version("4.9")) {
+        register(name, configureAction)
+    } else {
+        create(name, configureAction)
+    }
+}
 
 private class NixToolingModelBuilder(
     private val modelProperties: ModelProperties,
@@ -100,6 +105,7 @@ private fun Project.buildModel(
     )
 }
 
+@Suppress("UnstableApiUsage")
 private fun Project.buildGradle(): DefaultGradle =
     with(tasks.getByName<Wrapper>("wrapper")) {
         DefaultGradle(
@@ -113,18 +119,16 @@ private fun Project.buildGradle(): DefaultGradle =
                 }
                 ?: throw IllegalStateException(
                     """
-                            Failed to find native-platform jar in ${gradle.gradleHomeDir}.
+                    Failed to find native-platform jar in ${gradle.gradleHomeDir}.
-
+                    Ask Tad to fix this.
-                            Ask Tad to fix this.
+                    """.trimIndent()
-                        """.trimIndent()
                 )
         )
     }
 
-private fun Project.buildPlugins(pluginRequests: List<PluginRequest>): DefaultDependencies =
+private fun Project.buildPlugins(pluginRequests: List<PluginRequest>): List<DefaultArtifact> {
-    with(PluginResolver(gradle as GradleInternal, pluginRequests)) {
+    return objects.newInstance<PluginResolver>().resolve(pluginRequests).distinct().sorted()
-        DefaultDependencies(repositories.repositories(), artifacts())
+}
-    }
 
 private fun Project.includedBuilds(): List<DefaultIncludedBuild> =
     gradle.includedBuilds.map {
@@ -134,7 +138,7 @@ private fun Project.includedBuilds(): List<DefaultIncludedBuild> =
 private fun Project.buildProject(
     explicitConfigurations: List<String>,
     explicitSubprojects: Collection<Project>,
-    plugins: DefaultDependencies
+    pluginArtifacts: List<DefaultArtifact>
 ): DefaultProject {
     logger.lifecycle("    Subproject: $path")
     return DefaultProject(
@@ -142,34 +146,33 @@ private fun Project.buildProject(
         version = version.toString(),
         path = path,
         projectDir = projectDir.toRelativeString(rootProject.projectDir),
-        buildscriptDependencies = buildscriptDependencies(plugins),
+        buildscriptDependencies = buildscriptDependencies(pluginArtifacts),
         projectDependencies = projectDependencies(explicitConfigurations),
-        children = explicitSubprojects.map { it.buildProject(explicitConfigurations, emptyList(), plugins) }
+        children = explicitSubprojects.map {
+            it.buildProject(explicitConfigurations, emptyList(), pluginArtifacts)
+        }
     )
 }
 
-private fun Project.buildscriptDependencies(plugins: DefaultDependencies): DefaultDependencies =
+private fun Project.buildscriptDependencies(pluginArtifacts: List<DefaultArtifact>): List<DefaultArtifact> {
-    with(DependencyResolver(buildscript.configurations, buildscript.dependencies)) {
+    val resolverFactory = ConfigurationResolverFactory(buildscript.repositories)
-        DefaultDependencies(
+    val resolver = resolverFactory.create(buildscript.dependencies)
-            repositories = buildscript.repositories.repositories(),
+    val pluginIds = pluginArtifacts.map(DefaultArtifact::id)
-            artifacts = buildscript.configurations
+    return buildscript.configurations
-                .filter { it.isCanBeResolved }
+        .flatMap(resolver::resolve)
-                .flatMap { resolveDependencies(it) + resolvePoms(it) }
+        .distinct()
-                .minus(plugins.artifacts)
+        .filter { it.id !in pluginIds }
-                .distinct()
+        .sorted()
-        )
+}
-    }
 
-private fun Project.projectDependencies(explicitConfigurations: List<String>): DefaultDependencies =
+private fun Project.projectDependencies(explicitConfigurations: List<String>): List<DefaultArtifact> {
-    with(DependencyResolver(configurations, dependencies)) {
+    val resolverFactory = ConfigurationResolverFactory(repositories)
-        val toResolve = collectConfigurations(explicitConfigurations)
+    val resolver = resolverFactory.create(dependencies)
-        DefaultDependencies(
+    return collectConfigurations(explicitConfigurations)
-            repositories = repositories.repositories(),
+        .flatMap(resolver::resolve)
-            artifacts = toResolve.flatMap { resolveDependencies(it) + resolvePoms(it) }
+        .distinct()
-                .sorted()
+        .sorted()
-                .distinct()
+}
-        )
-    }
 
 private fun Project.dependentSubprojects(explicitConfigurations: List<String>): Set<Project> {
     return collectConfigurations(explicitConfigurations)
@@ -190,19 +193,6 @@ private fun Project.collectConfigurations(
     }
 }
 
-private val excludedRepoNames = setOf(
-    "Embedded Kotlin Repository",
-    ArtifactRepositoryContainer.DEFAULT_MAVEN_LOCAL_REPO_NAME
-)
-
-internal fun RepositoryHandler.repositories() = DefaultRepositories(
-    maven = filterIsInstance<MavenArtifactRepository>()
-        .filter { it.name !in excludedRepoNames }
-        .map { repo ->
-            DefaultMaven(listOf(repo.url.toString()) + repo.artifactUrls.map { it.toString() })
-        }
-)
-
 private fun fetchDistSha256(url: String): String {
     return URL("$url.sha256").openConnection().run {
         connect()
@@ -217,6 +207,9 @@ private val Wrapper.sha256: String
         return if (GradleVersion.current() < GradleVersion.version("4.5")) {
             fetchDistSha256(distributionUrl)
         } else {
+            @Suppress("UnstableApiUsage")
             distributionSha256Sum ?: fetchDistSha256(distributionUrl)
         }
     }
+
+private const val NIX_MODEL_NAME = "org.nixos.gradle2nix.Build"

plugin/src/main/kotlin/org/nixos/gradle2nix/ModelProperties.kt

@@ -1,6 +1,5 @@
 package org.nixos.gradle2nix
 
-import java.util.Properties
 import org.gradle.api.Project
 
 data class ModelProperties(

plugin/src/main/kotlin/org/nixos/gradle2nix/PluginResolver.kt

@@ -1,101 +1,27 @@
 package org.nixos.gradle2nix
 
-import org.gradle.api.artifacts.ExternalModuleDependency
+import org.gradle.api.internal.artifacts.dependencies.DefaultExternalModuleDependency
-import org.gradle.api.internal.GradleInternal
-import org.gradle.api.internal.artifacts.ivyservice.ivyresolve.strategy.VersionSelectorScheme
-import org.gradle.api.internal.plugins.PluginImplementation
-import org.gradle.kotlin.dsl.support.serviceOf
 import org.gradle.plugin.management.PluginRequest
-import org.gradle.plugin.management.internal.PluginRequestInternal
-import org.gradle.plugin.use.PluginId
 import org.gradle.plugin.use.internal.PluginDependencyResolutionServices
-import org.gradle.plugin.use.resolve.internal.ArtifactRepositoriesPluginResolver
+import javax.inject.Inject
-import org.gradle.plugin.use.resolve.internal.PluginResolution
-import org.gradle.plugin.use.resolve.internal.PluginResolutionResult
-import org.gradle.plugin.use.resolve.internal.PluginResolveContext
 
-internal class PluginResolver(
+internal open class PluginResolver @Inject constructor(
-    gradle: GradleInternal,
+    pluginDependencyResolutionServices: PluginDependencyResolutionServices
-    private val pluginRequests: Collection<PluginRequest>
 ) {
-    private val pluginDependencyResolutionServices = gradle.serviceOf<PluginDependencyResolutionServices>()
+    private val configurations = pluginDependencyResolutionServices.configurationContainer
-    private val versionSelectorScheme = gradle.serviceOf<VersionSelectorScheme>()
 
-    private val artifactRepositoriesPluginResolver = ArtifactRepositoriesPluginResolver(
+    private val resolver = ConfigurationResolverFactory(pluginDependencyResolutionServices.resolveRepositoryHandler)
-        pluginDependencyResolutionServices,
+        .create(pluginDependencyResolutionServices.dependencyHandler)
-        versionSelectorScheme
-    )
 
-    val repositories = pluginDependencyResolutionServices.resolveRepositoryHandler
+    fun resolve(pluginRequests: List<PluginRequest>): List<DefaultArtifact> {
-
+        val markerDependencies = pluginRequests.map {
-    private val resolver by lazy {
+            it.module?.let { selector ->
-        DependencyResolver(
+                DefaultExternalModuleDependency(selector.group, selector.name, selector.version)
-            pluginDependencyResolutionServices.configurationContainer,
+            } ?: it.id.run {
-            pluginDependencyResolutionServices.dependencyHandler
+                DefaultExternalModuleDependency(id, "$id.gradle.plugin", it.version)
-        )
-    }
-
-    private val pluginResult by lazy {
-        PluginResult().apply {
-            for (request in pluginRequests.filterIsInstance<PluginRequestInternal>()) {
-                artifactRepositoriesPluginResolver.resolve(request, this)
-            }
-        }
-    }
-
-    private val pluginContext by lazy {
-        PluginContext().apply {
-            for (result in pluginResult.found) result.execute(this)
-        }
-    }
-
-    fun artifacts(): List<DefaultArtifact> {
-        return (resolver.resolveDependencies(pluginContext.dependencies, true) +
-            resolver.resolvePoms(pluginContext.dependencies, true))
-            .sorted()
-            .distinct()
-    }
-
-    private class PluginResult : PluginResolutionResult {
-        val found = mutableSetOf<PluginResolution>()
-
-        override fun notFound(sourceDescription: String?, notFoundMessage: String?) {}
-
-        override fun notFound(
-            sourceDescription: String?,
-            notFoundMessage: String?,
-            notFoundDetail: String?
-        ) {
-        }
-
-        override fun isFound(): Boolean = true
-
-        override fun found(sourceDescription: String, pluginResolution: PluginResolution) {
-            found.add(pluginResolution)
-        }
-    }
-
-    private class PluginContext : PluginResolveContext {
-        val dependencies = mutableSetOf<ExternalModuleDependency>()
-        val repositories = mutableSetOf<String>()
-
-        override fun add(plugin: PluginImplementation<*>) {
-            println("add: $plugin")
-        }
-
-        override fun addFromDifferentLoader(plugin: PluginImplementation<*>) {
-            println("addFromDifferentLoader: $plugin")
-        }
-
-        override fun addLegacy(pluginId: PluginId, m2RepoUrl: String, dependencyNotation: Any) {
-            repositories.add(m2RepoUrl)
-        }
-
-        override fun addLegacy(pluginId: PluginId, dependencyNotation: Any) {
-            if (dependencyNotation is ExternalModuleDependency) {
-                dependencies.add(dependencyNotation)
             }
         }
+        return resolver.resolve(configurations.detachedConfiguration(*markerDependencies.toTypedArray()))
     }
 }
 

plugin/src/main/kotlin/org/nixos/gradle2nix/RepositoryResolver.kt

@@ -0,0 +1,212 @@
+package org.nixos.gradle2nix
+
+import org.apache.ivy.core.LogOptions
+import org.apache.ivy.core.cache.ArtifactOrigin
+import org.apache.ivy.core.cache.CacheResourceOptions
+import org.apache.ivy.core.cache.DefaultRepositoryCacheManager
+import org.apache.ivy.core.cache.RepositoryCacheManager
+import org.apache.ivy.core.module.id.ArtifactRevisionId
+import org.apache.ivy.core.module.id.ModuleRevisionId
+import org.apache.ivy.core.resolve.DownloadOptions
+import org.apache.ivy.core.settings.IvySettings
+import org.apache.ivy.plugins.repository.url.URLResource
+import org.apache.ivy.plugins.resolver.IBiblioResolver
+import org.apache.ivy.plugins.resolver.URLResolver
+import org.apache.maven.artifact.repository.metadata.io.xpp3.MetadataXpp3Reader
+import org.codehaus.plexus.util.ReaderFactory
+import org.codehaus.plexus.util.xml.pull.XmlPullParserException
+import org.gradle.api.artifacts.repositories.ArtifactRepository
+import org.gradle.api.artifacts.repositories.IvyArtifactRepository
+import org.gradle.api.artifacts.repositories.MavenArtifactRepository
+import org.gradle.api.internal.artifacts.repositories.ResolutionAwareRepository
+import org.gradle.api.internal.artifacts.repositories.resolver.IvyResolver
+import org.gradle.api.logging.Logger
+import org.gradle.api.logging.Logging
+import java.io.IOException
+import org.apache.ivy.core.module.descriptor.Artifact as IvyArtifact
+import org.apache.ivy.core.module.descriptor.DefaultArtifact as IvyDefaultArtifact
+import org.apache.ivy.plugins.resolver.RepositoryResolver as IvyRepositoryResolver
+
+internal fun ResolutionAwareRepository.repositoryResolver(ivySettings: IvySettings): RepositoryResolver? =
+    when(this) {
+        is MavenArtifactRepository -> MavenResolver(ivySettings, this)
+        is IvyArtifactRepository -> IvyResolver(ivySettings, this)
+        else -> null
+    }
+
+internal sealed class RepositoryResolver {
+    companion object {
+        @JvmStatic
+        protected val log: Logger = Logging.getLogger("gradle2nix")
+    }
+
+    abstract val ivyResolver: IvyRepositoryResolver
+
+    abstract fun resolve(
+        artifactId: DefaultArtifactIdentifier,
+        sha256: String? = null
+    ): DefaultArtifact?
+}
+
+internal class MavenResolver(
+    ivySettings: IvySettings,
+    repository: MavenArtifactRepository
+) : RepositoryResolver() {
+
+    override val ivyResolver: IBiblioResolver = IBiblioResolver().apply {
+        name = repository.name
+        root = repository.url.toString()
+        isM2compatible = true
+        settings = ivySettings
+        setCache(cacheManager(ivySettings, repository).name)
+    }
+
+    override fun resolve(artifactId: DefaultArtifactIdentifier, sha256: String?): DefaultArtifact? {
+        val ivyArtifact: IvyArtifact = artifactId.toArtifact()
+        val origin = ivyResolver.locate(ivyArtifact)?.takeIf(ArtifactOrigin::isExists) ?: return null
+        val hash = sha256 ?: ivyResolver.download(origin, downloadOptions).localFile?.sha256() ?: return null
+        val snapshotVersion: SnapshotVersion? = artifactId.version.snapshotVersion()?.let {
+            findSnapshotVersion(artifactId, it)
+        }
+        return DefaultArtifact(
+            id = artifactId,
+            name = artifactId.filename(snapshotVersion),
+            path = artifactId.repoPath(),
+            timestamp = snapshotVersion?.timestamp,
+            build = snapshotVersion?.build,
+            urls = listOf(origin.location),
+            sha256 = hash
+        )
+    }
+
+    private fun findSnapshotVersion(
+        artifactId: ArtifactIdentifier,
+        snapshotVersion: SnapshotVersion
+    ): SnapshotVersion {
+        if (snapshotVersion.timestamp != null) return snapshotVersion
+        val metadataLocation = "${ivyResolver.root}${artifactId.repoPath()}/maven-metadata.xml".toUrl()
+        val metadataFile = ivyResolver.repositoryCacheManager.downloadRepositoryResource(
+            URLResource(metadataLocation, ivyResolver.timeoutConstraint),
+            "maven-metadata",
+            "maven-metadata",
+            "xml",
+            CacheResourceOptions(),
+            ivyResolver.repository
+        ).localFile
+
+        if (metadataFile == null) {
+            log.warn("maven-metadata.xml not found for snapshot dependency: $artifactId")
+            return snapshotVersion
+        }
+
+        fun parseError(e: Throwable): Pair<String?, Int?> {
+            log.error("Failed to parse maven-metadata.xml for artifact: $artifactId")
+            log.error("Error was: ${e.message}", e)
+            return null to null
+        }
+
+        val (timestamp: String?, build: Int?) = try {
+            MetadataXpp3Reader()
+                .read(ReaderFactory.newXmlReader(metadataFile))
+                .versioning?.snapshot?.run { timestamp to buildNumber }
+                ?: null to null
+        } catch (e: IOException) {
+            parseError(e)
+        } catch (e: XmlPullParserException) {
+            parseError(e)
+        }
+
+        return snapshotVersion.copy(timestamp = timestamp, build = build)
+    }
+}
+
+internal class IvyResolver(
+    ivySettings: IvySettings,
+    repository: IvyArtifactRepository
+) : RepositoryResolver() {
+
+    override val ivyResolver: URLResolver = URLResolver().apply {
+        name = repository.name
+        val ivyResolver = (repository as ResolutionAwareRepository).createResolver() as IvyResolver
+        isM2compatible = ivyResolver.isM2compatible
+        for (p in ivyResolver.ivyPatterns) addIvyPattern(p)
+        for (p in ivyResolver.artifactPatterns) addArtifactPattern(p)
+        settings = ivySettings
+        setCache(cacheManager(ivySettings, repository).name)
+    }
+
+    override fun resolve(artifactId: DefaultArtifactIdentifier, sha256: String?): DefaultArtifact? {
+        val ivyArtifact: IvyArtifact = artifactId.toArtifact()
+        val origin = ivyResolver.locate(ivyArtifact)?.takeIf(ArtifactOrigin::isExists) ?: return null
+        val hash = sha256 ?: ivyResolver.download(origin, downloadOptions).localFile?.sha256() ?: return null
+        return DefaultArtifact(
+            id = DefaultArtifactIdentifier(artifactId),
+            name = artifactId.filename(null),
+            path = artifactId.repoPath(),
+            urls = listOf(origin.location),
+            sha256 = hash
+        )
+    }
+}
+
+private fun cacheManager(ivySettings: IvySettings, repository: ArtifactRepository): RepositoryCacheManager {
+    return DefaultRepositoryCacheManager(
+        "${repository.name}-cache",
+        ivySettings,
+        createTempDir("gradle2nix-${repository.name}-cache")
+    ).also {
+        ivySettings.addRepositoryCacheManager(it)
+    }
+}
+
+private val metadataTypes = setOf("pom", "ivy")
+
+private fun ArtifactIdentifier.toArtifact(): IvyArtifact {
+    val moduleRevisionId = ModuleRevisionId.newInstance(group, name, version)
+    val artifactRevisionId = ArtifactRevisionId.newInstance(
+        moduleRevisionId,
+        name,
+        type,
+        extension,
+        classifier?.let { mapOf("classifier" to it) }
+    )
+    return IvyDefaultArtifact(artifactRevisionId, null, null, type in metadataTypes)
+}
+
+private data class SnapshotVersion(
+    val base: String,
+    val timestamp: String?,
+    val build: Int?
+) {
+    override fun toString(): String {
+        return if (timestamp != null && build != null) {
+            "$base-$timestamp-$build"
+        } else {
+            "$base-SNAPSHOT"
+        }
+    }
+}
+
+private val SNAPSHOT_REGEX = Regex("^(.*)-SNAPSHOT$")
+private val SNAPSHOT_TIMESTAMPED_REGEX = Regex("^(.*)-([0-9]{8}.[0-9]{6})-([0-9]+)$")
+
+private fun String.snapshotVersion(): SnapshotVersion? {
+    return SNAPSHOT_REGEX.find(this)?.destructured?.let { (base) ->
+        SnapshotVersion(base, null, null)
+    } ?: SNAPSHOT_TIMESTAMPED_REGEX.find(this)?.destructured?.let { (base, timestamp, build) ->
+        SnapshotVersion(base, timestamp, build.toInt())
+    }
+}
+
+private fun ArtifactIdentifier.repoPath(): String =
+    "${group.replace('.', '/')}/$name/$version"
+
+private fun ArtifactIdentifier.filename(
+    snapshotVersion: SnapshotVersion?
+): String = buildString {
+    append(name, "-", snapshotVersion ?: version)
+    if (classifier != null) append("-", classifier)
+    append(".", extension)
+}
+
+private val downloadOptions = DownloadOptions().apply { log = LogOptions.LOG_QUIET }

plugin/src/main/kotlin/org/nixos/gradle2nix/Util.kt

@@ -0,0 +1,21 @@
+package org.nixos.gradle2nix
+
+import java.io.File
+import java.net.URL
+import java.security.MessageDigest
+
+private const val HEX = "0123456789abcdef"
+
+internal fun File.sha256(): String = readBytes().sha256()
+
+private fun ByteArray.sha256() = buildString {
+    MessageDigest.getInstance("SHA-256").digest(this@sha256)
+        .asSequence()
+        .map(Byte::toInt)
+        .forEach {
+            append(HEX[it shr 4 and 0x0f])
+            append(HEX[it and 0x0f])
+        }
+}
+
+internal fun String.toUrl(): URL = URL(this)