fix: add remote tool cache gc

scripts/src/gc-remote.ts

@@ -13,6 +13,7 @@ interface RemoteGcOptions {
   buildCacheUntil: string;
   tmp: boolean;
   tmpMinAgeHours: number;
+  toolCaches: boolean;
   aptCache: boolean;
   coreDumps: boolean;
   coreDumpMinAgeHours: number;
@@ -39,6 +40,7 @@ const DEFAULT_REMOTE_OPTIONS: RemoteGcOptions = {
   buildCacheUntil: "24h",
   tmp: true,
   tmpMinAgeHours: 24,
+  toolCaches: false,
   aptCache: true,
   coreDumps: true,
   coreDumpMinAgeHours: 1,
@@ -144,6 +146,10 @@ function parseRemoteGcOptions(args: string[]): RemoteGcOptions {
       options.buildCache = false;
     } else if (arg === "--no-tmp") {
       options.tmp = false;
+    } else if (arg === "--include-tool-caches") {
+      options.toolCaches = true;
+    } else if (arg === "--no-tool-caches") {
+      options.toolCaches = false;
     } else if (arg === "--no-apt-cache") {
       options.aptCache = false;
     } else if (arg === "--no-core-dumps") {
@@ -280,6 +286,24 @@ CORE_DUMP_DIR_ALLOWLIST = set([
     "/root/unidesk",
 ])
 
+TOOL_CACHE_ALLOWLIST = [
+    {
+        "id": "npm-cacache",
+        "path": "/root/.npm/_cacache",
+        "description": "Delete npm content-addressable package cache; npm can rebuild it.",
+    },
+    {
+        "id": "npm-npx",
+        "path": "/root/.npm/_npx",
+        "description": "Delete npx package execution cache; npx can rebuild it.",
+    },
+    {
+        "id": "bun-install-cache",
+        "path": "/root/.bun/install/cache",
+        "description": "Delete Bun install package cache; bun can rebuild it.",
+    },
+]
+
 REGISTRY_REPOSITORY_ROOT = "/var/lib/hwlab/registry/docker/registry/v2/repositories"
 REGISTRY_ROOT = "/var/lib/hwlab/registry"
 REGISTRY_PROTECTED_TAGS = set([
@@ -1819,6 +1843,23 @@ def collect_candidates(observed_at):
                 "action": {"command": ["apt-get", "clean"]},
             })
 
+    if OPTIONS.get("toolCaches", False):
+        for item in TOOL_CACHE_ALLOWLIST:
+            path = item["path"]
+            size = du_size(path, 8) or 0
+            if size <= 0:
+                continue
+            candidates.append({
+                "id": "tool-cache:%s" % item["id"],
+                "kind": "tool-cache-delete",
+                "risk": "medium",
+                "description": item["description"],
+                "path": path,
+                "sizeBytes": size,
+                "estimatedReclaimBytes": size,
+                "action": {"op": "rm-recursive", "allowlist": "remote-tool-cache"},
+            })
+
     if OPTIONS.get("coreDumps", True):
         cutoff = time.time() - float(OPTIONS.get("coreDumpMinAgeHours") or 1) * 3600
         for root in sorted(CORE_DUMP_DIR_ALLOWLIST):
@@ -2037,6 +2078,14 @@ def assert_core_dump_candidate(path):
     if fuser["exitCode"] == 0:
         raise RuntimeError("refusing to remove core dump with active process reference: %s" % path)
 
+def assert_tool_cache_candidate(path):
+    resolved = os.path.abspath(path)
+    allowed = set(item["path"] for item in TOOL_CACHE_ALLOWLIST)
+    if resolved not in allowed:
+        raise RuntimeError("refusing to remove tool cache outside allowlist: %s" % path)
+    if os.path.islink(resolved):
+        raise RuntimeError("refusing to remove symlink tool cache: %s" % path)
+
 def execute(candidate):
     kind = candidate.get("kind")
     if kind == "journal-vacuum":
@@ -2065,6 +2114,15 @@ def execute(candidate):
             raise RuntimeError((result["stderr"] or "apt-get clean failed").strip())
         after = du_size("/var/cache/apt/archives") or 0
         return {"reclaimedBytes": max(0, before - after), "commandOutput": bounded(result)}
+    if kind == "tool-cache-delete":
+        path = candidate.get("path") or ""
+        assert_tool_cache_candidate(path)
+        before = du_size(path, 8) or path_size(path)
+        if os.path.isdir(path):
+            shutil.rmtree(path, ignore_errors=True)
+        elif os.path.exists(path):
+            os.unlink(path)
+        return {"reclaimedBytes": before}
     if kind == "tmp-path-delete":
         path = candidate.get("path") or ""
         assert_tmp_candidate(path)

scripts/src/help.ts

@@ -350,6 +350,7 @@ function gcHelp(): unknown {
       "--result-limit N": "number of per-candidate run results returned when --full is not set; default 50",
       "--full|--raw": "return and run against all candidates rather than the default bounded page",
       "--include-browser-cache": "also remove repo-local .state/playwright-browsers cache",
+      "--include-tool-caches": "local and remote explicit opt-in: remove rebuildable npm/npx/Bun package caches from fixed allowlisted paths",
       "--include-state-artifacts": "manual local gc only: opt in to stale UniDesk .state artifact retention for allowlisted diagnostic files and deploy artifact direct directories",
       "--state-artifact-keep-days N": "keep recent UniDesk .state artifacts for N days; default 14; must be a positive integer",
       "--include-state-stale-scratch": "manual local gc only: opt in to YAML allowlisted stale .state scratch roots; roots and keepHours come from config/unidesk-cli.yaml#gc",