nixpkgs/pkgs/build-support/build-fhs-userenv/default.nix

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{ callPackage, runCommandLocal, writeScript, stdenv, coreutils }:
let buildFHSEnv = callPackage ./env.nix { }; in
args@{ name, runScript ? "bash", extraInstallCommands ? "", meta ? {}, passthru ? {}, ... }:
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let
env = buildFHSEnv (removeAttrs args [ "runScript" "extraInstallCommands" "meta" "passthru" ]);
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chrootenv = callPackage ./chrootenv {};
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init = run: writeScript "${name}-init" ''
#! ${stdenv.shell}
for i in ${env}/* /host/*; do
path="/''${i##*/}"
[ -e "$path" ] || ${coreutils}/bin/ln -s "$i" "$path"
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done
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[ -d "$1" ] && [ -r "$1" ] && cd "$1"
shift
source /etc/profile
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exec ${run} "$@"
'';
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in runCommandLocal name {
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inherit meta;
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passthru = passthru // {
env = runCommandLocal "${name}-shell-env" {
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shellHook = ''
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exec ${chrootenv}/bin/chrootenv ${init runScript} "$(pwd)"
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'';
} ''
echo >&2 ""
echo >&2 "*** User chroot 'env' attributes are intended for interactive nix-shell sessions, not for building! ***"
echo >&2 ""
exit 1
'';
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};
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} ''
mkdir -p $out/bin
cat <<EOF >$out/bin/${name}
#! ${stdenv.shell}
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exec ${chrootenv}/bin/chrootenv ${init runScript} "\$(pwd)" "\$@"
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EOF
chmod +x $out/bin/${name}
${extraInstallCommands}
''