{"record":{"id":"f7dd73fe7c4d808f","repo":"mvanhorn/last30days-skill","slug":"engine-create-tmp-cache-s-set-s-to-override","errorCode":null,"errorMessage":"engine: create tmp cache (%s, set %s to override): %w","messagePattern":"engine: create tmp cache \\((.+?), set (.+?) to override\\): %w","errorType":"exception","errorClass":null,"httpStatus":null,"severity":"error","filePath":"mcp/internal/engine/extract.go","lineNumber":80,"sourceCode":"\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 {\n\t\t_ = os.RemoveAll(tmpDir)\n\t\treturn fmt.Errorf(\"engine: promote tmp cache: %w\", err)\n\t}","sourceCodeStart":62,"sourceCodeEnd":98,"githubUrl":"https://github.com/mvanhorn/last30days-skill/blob/c7460f6114449ddfe6ea3fc2f23c3d910c0e740c/mcp/internal/engine/extract.go#L62-L98","documentation":"Error \"engine: create tmp cache (%s, set %s to override): %w\" thrown in mvanhorn/last30days-skill.","triggerScenarios":"Fires when the engine cannot create the temporary cache directory used to stage the embedded last30days payload, typically because the cache root is unwritable or the disk is full.","commonSituations":"See trigger scenarios.","solutions":["Ensure the parent cache directory exists and is writable by the current user.","Set LAST30DAYS_CACHE_DIR to a writable location and retry.","Free disk space if the filesystem is full."],"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":"2026-08-15T22:17:37.221Z"}