nix-unstable-static: ship with complementary user script

images/nix-unstable-static/README.md

@@ -6,3 +6,11 @@ into /bin.
 
 The main use-case is to be able to run nix in the container, but share the
 `/nix/store` with the host.
+
+## Using the container with the host store
+
+This folder ships with a complementary script that you can use to run the
+image as the current user and the host /nix/store.
+
+Usage: `docker-nix-user.sh [<command> ...<args>]`
+

images/nix-unstable-static/docker-nix-user.sh

@@ -0,0 +1,28 @@
+#!/usr/bin/env bash
+#
+# Run nixpkgs/nix-unstable-static as the current user and the host /nix/store.
+#
+# Usage: docker-nix-user.sh [<command> ...<args>]
+#
+set -euo pipefail
+
+image=nixpkgs/nix-unstable-static
+
+options=(
+  -ti
+  # Remove the container on exit
+  --rm
+  -e NIX_PATH="nixpkgs=channel:nixos-22.05"
+  # Used by /run_as_user.sh
+  -e user_id="$(id -u)"
+  -e user_name="$(id -nu)"
+  -e group_id="$(id -g)"
+  -e group_name="$(id -ng)"
+  # Use the host store
+  -v /nix:/nix
+  # Mount the code into the container
+  -v "$PWD:/workspace"
+  -w /workspace
+  --entrypoint /run_as_user.sh
+)
+exec docker run "${options[@]}" "$image" "$@"