{"record":{"id":"1d49b08f0f265376","repo":"gastownhall/beads","slug":"open-log-file-q-w","errorCode":null,"errorMessage":"open log file %q: %w","messagePattern":"open log file %q: %w","errorType":"exception","errorClass":null,"httpStatus":null,"severity":"error","filePath":"internal/storage/dbproxy/proxy/endpoint.go","lineNumber":481,"sourceCode":"\tif opts.Backend == BackendExternal {\n\t\text := opts.External\n\t\tif ext.Host != \"\" {\n\t\t\targs = append(args, \"--external-host\", ext.Host)\n\t\t}\n\t\tif ext.Port != 0 {\n\t\t\targs = append(args, \"--external-port\", strconv.Itoa(ext.Port))\n\t\t}\n\t\tif ext.Socket != \"\" {\n\t\t\targs = append(args, \"--external-socket-path\", ext.Socket)\n\t\t}\n\t\tif ext.KeepAlivePeriod != 0 {\n\t\t\targs = append(args, \"--external-keep-alive\", ext.KeepAlivePeriod.String())\n\t\t}\n\t}\n\n\tlogFile, err := os.OpenFile(opts.LogFilePath, os.O_CREATE|os.O_WRONLY|os.O_APPEND, 0o600) //nolint:gosec // G304: logFilePath is caller-derived (workspace path), not user-request input\n\tif err != nil {\n\t\treturn nil, fmt.Errorf(\"open log file %q: %w\", opts.LogFilePath, err)\n\t}\n\n\tcmd := exec.Command(self, args...)\n\tcmd.Stdin = nil\n\tcmd.Stdout = logFile\n\tcmd.Stderr = logFile\n\tcmd.SysProcAttr = procAttrDetached()\n\n\tbirth, err := procid.Capture(os.Getpid())\n\tif err != nil {\n\t\t_ = logFile.Close()\n\t\treturn nil, fmt.Errorf(\"capture spawning process identity: %w\", err)\n\t}\n\tmarker := spawnMarker{\n\t\tSchema:      1,\n\t\tPID:         os.Getpid(),\n\t\tBirth:       string(birth),\n\t\tStopEpoch:   stopEpoch,","sourceCodeStart":463,"sourceCodeEnd":499,"githubUrl":"https://github.com/gastownhall/beads/blob/71377f276968b452ee607177637970a4ff888584/internal/storage/dbproxy/proxy/endpoint.go#L463-L499","documentation":"Returned by forkExecChild when the parent cannot open (create/append to) the child's log file at opts.LogFilePath with mode 0600. The child's stdout/stderr are redirected to this file, so without it the spawn cannot proceed.","triggerScenarios":"GetCreateDatabaseProxyServerEndpoint → spawnAndHandoff → forkExecChild when the log path's parent directory doesn't exist, the directory isn't writable, the path points to a read-only mount, or a file exists at that path without write permission.","commonSituations":"Workspace path on a read-only volume; misconfigured LogFilePath pointing outside the workspace; permissions changed by another tool; running under a different UID than the directory owner; disk full.","solutions":["Verify opts.LogFilePath's parent directory exists and is writable by the current user (mkdir -p, chown/chmod as needed).","Correct the LogFilePath configuration to a valid writable location inside the workspace.","Check for a read-only mount or full disk on the target path (mount, df).","Clear any non-writable file occupying the log path and retry."],"exampleFix":"// before: log path in a nonexistent dir\nopts := OpenOpts{LogFilePath: \"/nonexistent/dir/proxy.log\"}\n// after: ensure the directory exists and is writable\nos.MkdirAll(filepath.Dir(logPath), 0o755)\nopts := OpenOpts{LogFilePath: logPath}","handlingStrategy":"validation","validationCode":"if err := os.MkdirAll(filepath.Dir(opts.LogFilePath), 0o755); err != nil {\n    return fmt.Errorf(\"log dir not creatable: %w\", err)\n}\nf, err := os.OpenFile(opts.LogFilePath, os.O_CREATE|os.O_WRONLY|os.O_APPEND, 0o600)\nif err != nil { return fmt.Errorf(\"log path not writable: %w\", err) }\nf.Close()","typeGuard":null,"tryCatchPattern":"ep, err := GetCreateDatabaseProxyServerEndpoint(rootDir, opts)\nif err != nil && strings.Contains(err.Error(), \"open log file\") {\n    return fmt.Errorf(\"check LogFilePath %q: directory must exist and be writable: %w\", opts.LogFilePath, err)\n}","preventionTips":["Always create the log directory before opening the proxy","Keep LogFilePath inside the writable workspace","Watch for read-only mounts and full disks (mount, df)","Don't run the proxy under a UID that lacks write access to the log path"],"tags":["go","file-io","permissions","logging"],"backgroundTag":"log-file-open-failed","analyzedSha":"71377f276968b452ee607177637970a4ff888584","analyzedAt":"2026-08-30T18:55:39.744Z","schemaVersion":2},"datasetVersion":"2026-08-30T23:17:21.991Z"}