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https://github.com/lucannez64/darling-lol.git
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David GhegheaandClaude Opus 5.5
8c25542b31
The prefix holds the installed clients and game (about 40 GB). The Nix
launcher always exported DPREFIX=${DPREFIX:-~/.darling}, so the prefix saved
in build/config.json was never used and the only way to move it was an
environment variable in every launch context.
- The launcher uses DPREFIX if set, then the saved prefix, then ~/.darling.
- darling-lol --set-prefix PATH runs scripts/nix-prefix.py in the namespace,
whose root owns the prefix files, so cp -a keeps their owners and xattrs.
It renames the prefix when possible; across filesystems it copies to
PATH.partial and removes the old prefix and its overlay work directory
only after the copy completes. A PATH that already holds a Darling prefix
is used as it is. It refuses non-empty directories that are not prefixes,
nested paths and paths with commas or colons (overlayfs separators), then
saves the path with configure.py --prefix.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
96 lines
4.0 KiB
Bash
96 lines
4.0 KiB
Bash
#!/usr/bin/env bash
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set -euo pipefail
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WORKSPACE="${XDG_DATA_HOME:-$HOME/.local/share}/darling-lol"
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SHARE_DIR="@SHARE_DIR@"
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FHS_BIN="@FHS_BIN@"
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UNSHARE_BIN="@UNSHARE_BIN@"
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# The store package is both a compatibility identity and a closure GC root.
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export DARLING_PACKAGE_ID="$SHARE_DIR"
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export DISPLAY="${DISPLAY:-:0}"
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export EGL_PLATFORM="${EGL_PLATFORM:-x11}"
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# The guest prefix: DPREFIX if set, else the one saved by --set-prefix, else ~/.darling.
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if [ -z "${DPREFIX:-}" ] && [ -f "$WORKSPACE/build/config.json" ]; then
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DPREFIX=$(python3 -c 'import json, sys; print(json.load(open(sys.argv[1])).get("prefix", ""))' \
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"$WORKSPACE/build/config.json" 2>/dev/null) || DPREFIX=
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fi
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export DPREFIX="${DPREFIX:-$HOME/.darling}"
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if [ "${1:-}" = --set-prefix ]; then
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[ $# -eq 2 ] || { echo 'Usage: darling-lol --set-prefix PATH' >&2; exit 2; }
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# Resolve here: the namespace starts in the workspace, not in this directory.
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set -- --set-prefix "$(realpath -m -- "$2")"
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fi
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export DARLING_HOST_UID="$(id -u)"
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export DARLING_HOST_GID="$(id -g)"
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export DARLING_WORKSPACE="$WORKSPACE"
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python3 - "$WORKSPACE" <<'PY'
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import pathlib, sys
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workspace = pathlib.Path(sys.argv[1])
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for path in [workspace, *workspace.parents]:
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if path.is_symlink():
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raise SystemExit(f'Refusing symlink workspace ancestor: {path}')
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if (workspace / '.launcher.lock').is_symlink():
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raise SystemExit('Refusing symlink workspace lock')
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PY
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mkdir -p "$WORKSPACE"
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if [ "${1:-}" = --stop ]; then
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exec python3 "$SHARE_DIR/scripts/nix-stop.py" "$WORKSPACE" "$DPREFIX"
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fi
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# One mutable base runtime per workspace; do not refresh scripts mid-session.
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exec 9<>"$WORKSPACE/.launcher.lock"
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flock -n 9 || { echo 'Another darling-lol workspace session is active; use its terminal.' >&2; exit 1; }
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# Do not attempt to reconnect across separately created user namespaces. No kill,
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# sudo, or shutdown is attempted here (the PID might even be stale/reused).
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if [ -f "$DPREFIX/.init.pid" ]; then
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read -r server_pid < "$DPREFIX/.init.pid" || true
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if [[ "${server_pid:-}" =~ ^[1-9][0-9]*$ ]] && [ -d "/proc/$server_pid" ]; then
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state=$(awk '/^State:/ {print $2}' "/proc/$server_pid/status")
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if [ "$state" != Z ]; then
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echo 'Prefix has a live server marker; namespace reconnect is unsupported.' >&2
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echo 'Run darling-lol --stop to stop it, then retry. No processes were stopped.' >&2
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exit 1
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fi
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fi
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fi
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python3 "$SHARE_DIR/scripts/nix-copy.py" "$SHARE_DIR" "$WORKSPACE"
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mkdir -p "$WORKSPACE/usr-local"
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cd "$WORKSPACE"
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# Map subordinate IDs before bubblewrap sets no_new_privs. UID 0 is not host root.
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fhs_command=("$UNSHARE_BIN" --user --map-auto --map-current-user --setuid=0 --setgid=0 "$FHS_BIN")
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stop_request="$WORKSPACE/.stop-request"
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rm -f "$stop_request"
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# Ctrl+C, a closed terminal or SIGTERM must reach nix-lifecycle.py, which shuts
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# Darling down in its namespace. They would kill bubblewrap first, and
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# bubblewrap's --die-with-parent would kill the lifecycle with it. So bubblewrap
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# starts with them ignored and env restores them inside. This supervisor turns
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# them into a stop request, the same one darling-lol --stop makes.
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session() {
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(trap '' INT QUIT HUP TERM
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exec "${fhs_command[@]}" env --default-signal=INT,QUIT,HUP,TERM bash ./scripts/nix-session.sh "$@") 0<&0 &
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local pid=$! status
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trap 'touch "$stop_request"' INT HUP TERM
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while :; do
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wait "$pid" && status=0 || status=$?
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kill -0 "$pid" 2>/dev/null || break
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done
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trap - INT HUP TERM
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rm -f "$stop_request"
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return "$status"
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}
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# Keep this supervisor alive to hold the lock: bubblewrap may close extra FDs.
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# It never owns or signals game processes.
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case "${1:-}" in
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--shell) shift; "${fhs_command[@]}" bash "$@";;
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--update) shift; "${fhs_command[@]}" ./scripts/update.sh "$@";;
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# In the namespace, whose root owns the prefix files, so a copy keeps owners.
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--set-prefix) "${fhs_command[@]}" python3 ./scripts/nix-prefix.py "$2";;
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--installer) shift; session --installer "$@";;
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*)
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if [ $# -gt 0 ]; then
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"${fhs_command[@]}" "$@"
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else
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session
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fi;;
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esac
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