{"record":{"id":"88a4b40270f7ccd7","repo":"cloudflare/cloudflared","slug":"error-waiting-from-command-s-w","errorCode":null,"errorMessage":"error waiting from command '%s': %w","messagePattern":"error waiting from command '(.+?)': %w","errorType":"exception","errorClass":null,"httpStatus":null,"severity":"error","filePath":"diagnostic/log_collector_utils.go","lineNumber":59,"sourceCode":"\t\t\t\"error copying stdout from %s to file %s: %w\",\n\t\t\tcommand.String(),\n\t\t\toutputHandle.Name(),\n\t\t\terr,\n\t\t)\n\t}\n\n\t_, err = io.Copy(outputHandle, stderrReader)\n\tif err != nil {\n\t\treturn nil, fmt.Errorf(\n\t\t\t\"error copying stderr from %s to file %s: %w\",\n\t\t\tcommand.String(),\n\t\t\toutputHandle.Name(),\n\t\t\terr,\n\t\t)\n\t}\n\n\tif err := command.Wait(); err != nil {\n\t\treturn nil, fmt.Errorf(\n\t\t\t\"error waiting from command '%s': %w\",\n\t\t\tcommand.String(),\n\t\t\terr,\n\t\t)\n\t}\n\n\treturn NewLogInformation(outputHandle.Name(), true, false), nil\n}\n\nfunc CopyFilesFromDirectory(path string) (string, error) {\n\tconst defaultLogFilename = \"cloudflared.log\"\n\n\t// rolling logs have as suffix the current date thus\n\t// when iterating the path files they are already in\n\t// chronological order\n\tfiles, err := os.ReadDir(path)\n\tif err != nil {\n\t\treturn \"\", fmt.Errorf(\"error reading directory %s: %w\", path, err)","sourceCodeStart":41,"sourceCodeEnd":77,"githubUrl":"https://github.com/cloudflare/cloudflared/blob/2253eeeb25a44a713a4b60b8ba1e1b3f377d1a0f/diagnostic/log_collector_utils.go#L41-L77","documentation":"After piping a command's output, PipeCommandOutputToFile calls command.Wait(). This error wraps a non-zero exit or wait failure of the diagnostic command (e.g. journalctl), preserving the command string.","triggerScenarios":"command.Wait() returns error: the underlying command (journalctl, etc.) exited non-zero — bad flags, insufficient privileges to read journal, command crashed.","commonSituations":"Running 'cloudflared diagnostic' as non-root where journalctl needs privileges; journalctl flags changed across systemd versions.","solutions":["Run the diagnostic with sufficient privileges (sudo/root) to read system logs","Run the wrapped command manually to see its real error message inside the %w chain","Adjust journalctl/log tool flags for the installed version"],"exampleFix":"// before\nsudo cloudflared diagnostic collect\n// after (verify underlying cmd first)\njournalctl --no-pager -o json   # reproduce error directly, fix flags/privileges, then retry","handlingStrategy":"try-catch","validationCode":"// pre-check privileges, e.g.\nif _, err := exec.LookPath(\"journalctl\"); err != nil { return err }\n","typeGuard":null,"tryCatchPattern":"out, err := diagnostic.PipeCommandOutputToFile(ctx, fs, cmd, file)\nif err != nil && strings.Contains(err.Error(), \"error waiting from command\") {\n\tlog.Warn().Err(err).Str(\"cmd\", cmd.String()).Msg(\"diagnostic command failed; skipping logs\")\n}","preventionTips":["Run diagnostics with the privileges the log sources require","Pin/verify log tool flags for the host's tool version","Treat log-collection failure as non-fatal for the overall diagnostic"],"tags":["command","diagnostics","process"],"backgroundTag":"git-command-failed","analyzedSha":"2253eeeb25a44a713a4b60b8ba1e1b3f377d1a0f","analyzedAt":"2026-09-06T04:14:33.757Z","contentChangedAt":"2026-09-06T04:14:33.757Z","schemaVersion":2},"datasetVersion":"2026-09-14T05:17:10.506Z"}