{"record":{"id":"c7371401845629a1","repo":"GoogleContainerTools/skaffold","slug":"writing-string-to-temporary-buffer-w","errorCode":null,"errorMessage":"writing string to temporary buffer: %w","messagePattern":"writing string to temporary buffer: %w","errorType":"exception","errorClass":null,"httpStatus":null,"severity":"warning","filePath":"pkg/skaffold/event/v2/event.go","lineNumber":366,"sourceCode":"\t}\n\t// Ensure that the filepath provided has the directories available when attemping to save the file.\n\tdir := filepath.Dir(fp)\n\tif err := os.MkdirAll(dir, 0700); err != nil {\n\t\treturn fmt.Errorf(\"unable to create directory %q: %w\", dir, err)\n\t}\n\tf, err := os.OpenFile(fp, os.O_TRUNC|os.O_WRONLY|os.O_CREATE, 0600)\n\tif err != nil {\n\t\treturn fmt.Errorf(\"opening %s: %w\", fp, err)\n\t}\n\tdefer f.Close()\n\n\t// Iterate over events, grabbing contents only from SkaffoldLogEvents\n\tvar contents bytes.Buffer\n\tfor _, ev := range handler.eventLog {\n\t\tif sle := ev.GetSkaffoldLogEvent(); sle != nil {\n\t\t\t// Strip ansi color sequences as this makes it easier to deal with when pasting into github issues\n\t\t\tif _, err = contents.WriteString(stripansi.Strip(sle.Message)); err != nil {\n\t\t\t\treturn fmt.Errorf(\"writing string to temporary buffer: %w\", err)\n\t\t\t}\n\t\t}\n\t}\n\n\t// Write contents of temporary buffer to file\n\tif _, err = f.Write(contents.Bytes()); err != nil {\n\t\treturn fmt.Errorf(\"writing buffer contents to file: %w\", err)\n\t}\n\treturn nil\n}\n\nfunc lastLogFile(fp string) (string, error) {\n\tif fp != \"\" {\n\t\treturn fp, nil\n\t}\n\n\t// last log location unspecified, use ~/.skaffold/last.log\n\thome, err := homedir.Dir()","sourceCodeStart":348,"sourceCodeEnd":384,"githubUrl":"https://github.com/GoogleContainerTools/skaffold/blob/a1189de023efc32d4b8e11f395acc678aa555011/pkg/skaffold/event/v2/event.go#L348-L384","documentation":"While building the log text in memory, SaveLastLog appends each ANSI-stripped SkaffoldLogEvent message to a bytes.Buffer via contents.WriteString. This error wraps a failure of that in-memory write, which in Go only happens when the buffer cannot grow (bytes.ErrTooLarge — exceeding maxBufferCapacity or an out-of-memory allocation).","triggerScenarios":"Calling SaveLastLog after a very long skaffold run whose accumulated SkaffoldLogEvent messages exceed bytes.Buffer's maximum capacity (~large GB), or a genuine memory-allocation failure during buffer growth.","commonSituations":"Extremely long-running debug/dev sessions with verbose logging accumulating gigabytes of log events; memory-constrained environments where a single buffer growth allocation fails.","solutions":["Restart the skaffold session / clear handler.eventLog so the buffer starts small.","Reduce log verbosity or the number of retained SkaffoldLogEvents before saving.","Stream events to the file incrementally instead of buffering everything in memory first."],"exampleFix":"// before\nvar contents bytes.Buffer\nfor _, ev := range handler.eventLog { /* buffer everything */ }\nf.Write(contents.Bytes())\n// after\nfor _, ev := range handler.eventLog {\n    if sle := ev.GetSkaffoldLogEvent(); sle != nil {\n        f.WriteString(stripansi.Strip(sle.Message)) // stream directly\n    }\n}","handlingStrategy":"fallback","validationCode":"total := 0\nfor _, ev := range handler.eventLog {\n    if sle := ev.GetSkaffoldLogEvent(); sle != nil {\n        total += len(sle.Message)\n    }\n}\nif total > 1<<30 {\n    return errors.New(\"event log exceeds 1GiB; trim before saving\")\n}","typeGuard":null,"tryCatchPattern":"if err := event.SaveLastLog(fp); err != nil {\n    if strings.Contains(err.Error(), \"temporary buffer\") {\n        log.Warnf(\"log too large to buffer: %v\", err)\n        return streamEventsToFile(fp) // custom streaming writer\n    }\n    return err\n}","preventionTips":["Cap retained event-log size in long-running sessions","Lower log verbosity for long dev loops","Stream log events to disk instead of building one large buffer"],"tags":["memory","buffer","io"],"backgroundTag":"buffer-write-failed","analyzedSha":"a1189de023efc32d4b8e11f395acc678aa555011","analyzedAt":"2026-09-05T12:09:27.064Z","contentChangedAt":"2026-09-05T12:09:27.064Z","schemaVersion":2},"datasetVersion":"2026-09-12T17:17:11.597Z"}