core/pkgs/build-support/build-fhsenv-chroot/default.nix
2024-05-13 22:24:10 +01:00

62 lines
1.4 KiB
Nix

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