{"record":{"id":"8bfaa67a2ea39302","repo":"Yeachan-Heo/oh-my-codex","slug":"refusing-cancellation-because-state-content-change","errorCode":null,"errorMessage":"Refusing cancellation because state content changed: ${change.entry.path}.","messagePattern":"Refusing cancellation because state content changed: (.+?)\\.","errorType":"exception","errorClass":"Error","httpStatus":null,"severity":"error","filePath":"src/cli/index.ts","lineNumber":8670,"sourceCode":"      .map((mode) => {\n        const entry = states.get(mode);\n        if (!entry) throw new Error(`Missing frozen cancellation entry for ${mode}.`);\n        return { mode, entry, nextContent: JSON.stringify(entry.state, null, 2) };\n      });\n    const opened: Array<{ mode: string; entry: (typeof states extends Map<string, infer T> ? T : never); nextContent: string; handle: Awaited<ReturnType<typeof open>> }> = [];\n    try {\n      for (const change of orderedChanges) {\n        assertRunAuthority();\n        const handle = await open(change.entry.path, fsConstants.O_RDWR | fsConstants.O_NOFOLLOW);\n        const currentStat = await handle.stat();\n        const currentContent = await handle.readFile({ encoding: \"utf-8\" });\n        if (!currentStat.isFile() || currentStat.dev !== change.entry.dev || currentStat.ino !== change.entry.ino) {\n          await handle.close();\n          throw new Error(`Refusing cancellation because state identity changed: ${change.entry.path}.`);\n        }\n        if (currentContent !== change.entry.originalContent) {\n          await handle.close();\n          throw new Error(`Refusing cancellation because state content changed: ${change.entry.path}.`);\n        }\n        opened.push({ ...change, handle });\n      }\n\n      const committed: typeof opened = [];\n      const cancellationTestWriteFailureMode = options.testFaults?.writeFailureMode;\n      const cancellationTestRollbackFailureMode = options.testFaults?.rollbackFailureMode;\n      try {\n        for (const openedEntry of opened) {\n          assertRunAuthority();\n          committed.push(openedEntry);\n          if (cancellationTestWriteFailureMode === openedEntry.mode) {\n            throw new Error(`Injected cancellation write failure for ${openedEntry.mode}.`);\n          }\n          await openedEntry.handle.truncate(0);\n          await openedEntry.handle.write(openedEntry.nextContent, 0, \"utf-8\");\n          await openedEntry.handle.sync();\n        }","sourceCodeStart":8652,"sourceCodeEnd":8688,"githubUrl":"https://github.com/Yeachan-Heo/oh-my-codex/blob/3ad79a8a6fe6e95fdbb8c00e40716fffe4011ce2/src/cli/index.ts#L8652-L8688","documentation":"During cancellation of an in-flight write, the CLI re-opens the target state file and compares its content against the originalContent snapshot recorded when the change was staged. If the bytes differ, it refuses to roll the file back, because blindly reverting would clobber concurrent modifications made by another process between the write attempt and the cancellation.","triggerScenarios":"Calling the cancellation/rollback path (cancelChanges / cancellation flow in src/cli/index.ts) for a state file whose on-disk content no longer equals change.entry.originalContent — i.e. some other writer (another CLI invocation, editor, watcher daemon) touched the file after the change was recorded but before cancellation completed.","commonSituations":"Two CLI processes operating on the same state directory concurrently; a file watcher or sync tool (Dropbox/IDE) rewriting the file mid-operation; stale change journal entries reused after an interrupted run; mtime-preserving copies that alter content.","solutions":["Ensure only one process mutates the state directory at a time (lock file or serialize invocations)","Re-read the current file content and re-stage the change instead of cancelling a stale entry","If the external modification is expected, discard the journal entry explicitly and start a fresh operation","Check for background sync/watcher tools rewriting state files and exclude the directory"],"exampleFix":"// before\nawait cancelChanges(entries); // throws: content changed\n\n// after\nif (await currentContentMatches(entry)) {\n  await cancelChanges(entries);\n} else {\n  await discardJournalEntry(entry); // restage from current content\n}","handlingStrategy":"validation","validationCode":"import { promises as fs } from \"node:fs\";\n// Before cancelling, confirm each entry still matches its snapshot\nfor (const change of pendingChanges) {\n  const current = await fs.readFile(change.entry.path, \"utf8\").catch(() => null);\n  if (current !== change.entry.originalContent) {\n    // restage from current content or abort cancellation\n    throw new Error(`Stale journal entry for ${change.entry.path}`);\n  }\n}\nawait cancelChanges(pendingChanges);","typeGuard":"function isFreshChange(change: ChangeEntry, currentContent: string | null): boolean {\n  return currentContent !== null && currentContent === change.originalContent;\n}","tryCatchPattern":"try {\n  await cancelChanges(changes);\n} catch (e) {\n  if (/Refusing cancellation because state content changed/.test(String(e))) {\n    // restage changes against current disk content instead of retrying blindly\n  } else throw e;\n}","preventionTips":["Serialize all writers to the state directory with a lockfile","Exclude state dirs from sync tools and file watchers","Never reuse journal entries across process restarts"],"tags":["cancellation","rollback","concurrent-write","state-management","file-system"],"backgroundTag":"concurrent-modification-detected","analyzedSha":"3ad79a8a6fe6e95fdbb8c00e40716fffe4011ce2","analyzedAt":"2026-08-27T22:18:39.783Z","schemaVersion":2},"datasetVersion":"2026-08-28T00:17:15.603Z"}