vibed improved gc

util/dev_flake_gc.sh

@@ -0,0 +1,101 @@
+set -o pipefail
+
+retention_days="30"
+scan_roots=(
+  /
+  /home
+  /root
+  /srv
+  /opt
+  /tmp
+  /var/tmp
+  /var/lib
+)
+
+root_seen() {
+  local candidate="$1"
+  local seen
+
+  for seen in "${seen_roots[@]}"; do
+    [ "$candidate" = "$seen" ] && return 0
+  done
+
+  return 1
+}
+
+has_recent_activity() {
+  local path="$1"
+
+  find "$path" \
+    -xdev \
+    \( -name .git -o -name .hg -o -name .svn -o -name node_modules -o -name target \) -prune \
+    -o -mindepth 1 -mtime "-$retention_days" -print -quit 2>/dev/null \
+    | grep -q .
+}
+
+is_nix_store_symlink() {
+  local link="$1"
+  local target
+
+  target="$(readlink "$link" 2>/dev/null || true)"
+  case "$target" in
+    /nix/store/*) return 0 ;;
+    *) return 1 ;;
+  esac
+}
+
+cleanup_direnv() {
+  local direnv_dir="$1"
+  local project_dir
+
+  project_dir="$(dirname "$direnv_dir")"
+
+  if [ ! -e "$project_dir/flake.nix" ] \
+    && [ ! -e "$direnv_dir/flake-profile" ] \
+    && [ ! -e "$direnv_dir/gcroots" ]; then
+    return
+  fi
+
+  if has_recent_activity "$project_dir"; then
+    return
+  fi
+
+  echo "Removing stale nix-direnv cache: $direnv_dir"
+  rm -rf --one-file-system "$direnv_dir"
+}
+
+cleanup_result_link() {
+  local link="$1"
+
+  if ! is_nix_store_symlink "$link"; then
+    return
+  fi
+
+  echo "Removing stale Nix build result symlink: $link"
+  rm -f "$link"
+}
+
+seen_roots=()
+
+for root in "${scan_roots[@]}"; do
+  [ -d "$root" ] || continue
+  root="$(readlink -f "$root")"
+  root_seen "$root" && continue
+  seen_roots+=("$root")
+
+  find "$root" \
+    -xdev \
+    \( -path /nix -o -path /proc -o -path /sys -o -path /dev -o -path /run -o -path /boot \) -prune \
+    -o -type d -name .direnv -mtime "+$retention_days" -print0 2>/dev/null \
+    | while IFS= read -r -d "" direnv_dir; do
+      cleanup_direnv "$direnv_dir"
+    done
+
+  find "$root" \
+    -xdev \
+    \( -path /nix -o -path /proc -o -path /sys -o -path /dev -o -path /run -o -path /boot \) -prune \
+    -o -type l \( -name result -o -name "result-*" \) -mtime "+$retention_days" -print0 2>/dev/null \
+    | while IFS= read -r -d "" link; do
+      cleanup_result_link "$link"
+    done
+done

util/system_notify.sh

@@ -0,0 +1,23 @@
+set -o pipefail
+
+target_user="${SYSTEM_NOTIFY_USER:-alisceon}"
+urgency="${1:-normal}"
+title="${2:-System task}"
+body="${3:-}"
+
+uid="$(id -u "$target_user" 2>/dev/null || true)"
+[ -n "$uid" ] || exit 0
+
+runtime_dir="/run/user/$uid"
+bus="$runtime_dir/bus"
+[ -S "$bus" ] || exit 0
+
+runuser -u "$target_user" -- env \
+  XDG_RUNTIME_DIR="$runtime_dir" \
+  DBUS_SESSION_BUS_ADDRESS="unix:path=$bus" \
+  notify-send \
+    --app-name="NixOS maintenance" \
+    --urgency="$urgency" \
+    "$title" \
+    "$body" \
+  || exit 0