{"record":{"id":"1352ff295dcd96af","repo":"mvanhorn/last30days-skill","slug":"engine-clean-tmp-cache-w","errorCode":null,"errorMessage":"engine: clean tmp cache: %w","messagePattern":"engine: clean tmp cache: %w","errorType":"exception","errorClass":null,"httpStatus":null,"severity":"error","filePath":"mcp/internal/engine/extract.go","lineNumber":77,"sourceCode":"// use Ensure with an explicit temp dir.\nfunc EnsureUserCache(src fs.FS, version string) (string, error) {\n\tif override := os.Getenv(CacheEnvOverride); override != \"\" {\n\t\treturn Ensure(src, override, version)\n\t}\n\tbase, err := os.UserCacheDir()\n\tif err != nil {\n\t\treturn \"\", fmt.Errorf(\"engine: resolve user cache dir (set %s to override): %w\", CacheEnvOverride, err)\n\t}\n\treturn Ensure(src, base, version)\n}\n\nfunc ensureLocked(src fs.FS, cacheDir, version string) error {\n\tif sentinelMatches(cacheDir, version) {\n\t\treturn nil\n\t}\n\ttmpDir := cacheDir + \".tmp\"\n\tif err := os.RemoveAll(tmpDir); err != nil {\n\t\treturn fmt.Errorf(\"engine: clean tmp cache: %w\", err)\n\t}\n\tif err := os.MkdirAll(tmpDir, 0o755); err != nil {\n\t\treturn fmt.Errorf(\"engine: create tmp cache (%s, set %s to override): %w\", tmpDir, CacheEnvOverride, err)\n\t}\n\tif err := extractAll(src, tmpDir); err != nil {\n\t\t_ = os.RemoveAll(tmpDir)\n\t\treturn err\n\t}\n\tsentinel := filepath.Join(tmpDir, SentinelFilename)\n\tif err := os.WriteFile(sentinel, []byte(version), 0o644); err != nil {\n\t\t_ = os.RemoveAll(tmpDir)\n\t\treturn fmt.Errorf(\"engine: write sentinel: %w\", err)\n\t}\n\tif err := os.RemoveAll(cacheDir); err != nil {\n\t\t_ = os.RemoveAll(tmpDir)\n\t\treturn fmt.Errorf(\"engine: clean old cache: %w\", err)\n\t}\n\tif err := os.Rename(tmpDir, cacheDir); err != nil {","sourceCodeStart":59,"sourceCodeEnd":95,"githubUrl":"https://github.com/mvanhorn/last30days-skill/blob/c7460f6114449ddfe6ea3fc2f23c3d910c0e740c/mcp/internal/engine/extract.go#L59-L95","documentation":"Error \"engine: clean tmp cache: %w\" thrown in mvanhorn/last30days-skill.","triggerScenarios":"Fires when the engine fails to remove a stale temporary cache directory before extraction, usually due to permission problems or files still held open by another process.","commonSituations":"See trigger scenarios.","solutions":["Remove the stale .tmp cache directory manually and retry.","Check permissions on the cache directory and ensure no other process holds files open inside it."],"exampleFix":null,"handlingStrategy":null,"validationCode":null,"typeGuard":null,"tryCatchPattern":null,"preventionTips":[],"tags":[],"backgroundTag":null,"analyzedSha":"c7460f6114449ddfe6ea3fc2f23c3d910c0e740c","analyzedAt":"2026-08-15T03:34:49.540Z","schemaVersion":2},"datasetVersion":"2026-08-15T17:31:12.345Z"}