{"record":{"id":"20b731c00e0563ea","repo":"kubernetes/kops","slug":"error-creating-file-q-v","errorCode":null,"errorMessage":"error creating file %q: %v","messagePattern":"error creating file %q: (.+?)","errorType":"exception","errorClass":null,"httpStatus":null,"severity":"warning","filePath":"pkg/dump/dumper.go","lineNumber":572,"sourceCode":"\tfor _, line := range strings.Split(stdout.String(), \"\\n\") {\n\t\ttokens := strings.Fields(line)\n\t\tif len(tokens) == 0 || tokens[0] == \"\" {\n\t\t\tcontinue\n\t\t}\n\t\tservices = append(services, tokens[0])\n\t}\n\treturn services, nil\n}\n\n// shellToFile executes a command and copies the output to a file\nfunc (n *logDumperNode) shellToFile(ctx context.Context, command string, destPath string) error {\n\tif err := os.MkdirAll(filepath.Dir(destPath), 0o755); err != nil {\n\t\tklog.Warningf(\"unable to mkdir on %q: %v\", filepath.Dir(destPath), err)\n\t}\n\n\tf, err := os.Create(destPath)\n\tif err != nil {\n\t\treturn fmt.Errorf(\"error creating file %q: %v\", destPath, err)\n\t}\n\tdefer f.Close()\n\n\tif err := n.client.ExecPiped(ctx, command, f, f); err != nil {\n\t\treturn fmt.Errorf(\"error executing command %q: %v\", command, err)\n\t}\n\n\treturn nil\n}\n\n// sshClientImplementation is the default implementation of sshClient, binding to a *ssh.Client\ntype sshClientImplementation struct {\n\tclient    *ssh.Client\n\tforwardTo string\n}\n\nvar _ sshClient = &sshClientImplementation{}\n","sourceCodeStart":554,"sourceCodeEnd":590,"githubUrl":"https://github.com/kubernetes/kops/blob/4c8573c808a73d578c5eadc86d410646ea0b0d73/pkg/dump/dumper.go#L554-L590","documentation":"Returned by logDumperNode.shellToFile (pkg/dump/dumper.go:572) when os.Create(destPath) fails while preparing to capture a remote command's output into the local artifacts directory. The remote command is never run; the failure is purely local filesystem access at the destination path (under d.artifactsDir/<node>/). Errors here are collected by dump and logged as warnings, not fatal.","triggerScenarios":"os.Create(destPath) errors: artifacts directory read-only or owned by another user, disk full on the machine running kops, invalid path characters from a node/service name, or a destPath that resolves to a directory. Note os.MkdirAll failure is only warned about, so a failed mkdir surfaces here instead.","commonSituations":"Running `kops toolbox dump` with --artifacts-dir (or default dir) on a read-only or full disk; running as a user without write permission to the artifacts dir; race where two dumpers write the same artifacts directory concurrently.","solutions":["Check disk space (df -h) and free space on the artifacts volume.","Fix permissions on the artifacts directory: chown/chmod so the kops user can write (MkdirAll failures earlier are only warned).","Verify the artifacts dir path is valid and not a file; avoid exotic characters in node/service names affecting the path.","Ensure only one dump process writes the same artifacts directory at a time.","Re-run the dump after freeing space or fixing permissions — the capture is idempotent per file."],"exampleFix":"// before\nif err := os.MkdirAll(filepath.Dir(destPath), 0o755); err != nil {\n    klog.Warningf(\"unable to mkdir on %q: %v\", filepath.Dir(destPath), err)\n}\nf, err := os.Create(destPath)\n// after\nif err := os.MkdirAll(filepath.Dir(destPath), 0o755); err != nil {\n    return fmt.Errorf(\"creating dir for %q: %w\", destPath, err)\n}\nf, err := os.Create(destPath)","handlingStrategy":"validation","validationCode":"// pre-check artifacts dir writability before dumping\ntestFile := filepath.Join(artifactsDir, \".write-test\")\nif err := os.WriteFile(testFile, nil, 0o644); err != nil {\n    return fmt.Errorf(\"artifacts dir %s not writable: %w\", artifactsDir, err)\n}\nos.Remove(testFile)\n// also check free space\nif st, err := os.Statfs(artifactsDir); err == nil && st.Bavail*uint64(st.Bsize) < 1<<30 {\n    return fmt.Errorf(\"less than 1GB free in %s\", artifactsDir)\n}","typeGuard":null,"tryCatchPattern":"f, err := os.Create(destPath)\nif err != nil {\n    return fmt.Errorf(\"error creating file %q: %w\", destPath, err)\n}\ndefer f.Close()","preventionTips":["Verify disk space and write permissions on the artifacts directory before starting a dump.","Run the dump as a user that owns (or can write to) the artifacts dir.","Don't run two dump processes against the same artifacts directory.","Make mkdir failures fatal in shellToFile instead of only warning."],"tags":["filesystem","permissions","node-dump","go"],"backgroundTag":"file-write-permission-denied","analyzedSha":"4c8573c808a73d578c5eadc86d410646ea0b0d73","analyzedAt":"2026-09-05T04:13:19.212Z","contentChangedAt":"2026-09-05T04:13:19.212Z","schemaVersion":2},"datasetVersion":"2026-09-12T12:17:11.808Z"}