{"record":{"id":"19c3d43d995f4775","repo":"abhigyanpatwari/GitNexus","slug":"analyzer-build-changed-while-its-identity-was-bein","errorCode":null,"errorMessage":"Analyzer build changed while its identity was being computed: ${buildRoot}","messagePattern":"Analyzer build changed while its identity was being computed: (.+?)","errorType":"exception","errorClass":null,"httpStatus":null,"severity":"error","filePath":"gitnexus/src/core/analyzer-identity.ts","lineNumber":2760,"sourceCode":"  const dependencyInputs = collectDependencyInputs(packageRoot, options, traversalLimits);\n  const dependencySnapshotBefore = dependencySnapshot(dependencyInputs);\n  const dependency = hashDependencyRuntime(\n    dependencyInputs,\n    previousCache,\n    options,\n    runtimeVariant,\n  );\n\n  const packageVersion = dependencyInputs.packages[0]?.manifest.version;\n  if (typeof packageVersion !== 'string' || packageVersion.trim() === '') {\n    throw new Error(`GitNexus package version is unavailable in ${packageRoot}`);\n  }\n\n  const buildSnapshotAfter = buildSnapshot(\n    collectBuildEntries(buildRoot, options, traversalLimits),\n  );\n  if (!isDeepStrictEqual(build.snapshot, buildSnapshotAfter)) {\n    throw new Error(`Analyzer build changed while its identity was being computed: ${buildRoot}`);\n  }\n  const dependencySnapshotAfter = dependencySnapshot(\n    collectDependencyInputs(packageRoot, options, traversalLimits),\n  );\n  if (!isDeepStrictEqual(dependencySnapshotBefore, dependencySnapshotAfter)) {\n    throw new Error(\n      `Analyzer dependency runtime changed while its identity was being computed: ${packageRoot}`,\n    );\n  }\n\n  const nextCache: IdentityCachePayload = {\n    schemaVersion: IDENTITY_CACHE_SCHEMA_VERSION,\n    packageRoot,\n    buildRoot,\n    packageVersion,\n    buildKind: kind,\n    buildCanonicalization: BUILD_CANONICALIZATION,\n    dependencyCanonicalization: DEPENDENCY_RUNTIME_CANONICALIZATION,","sourceCodeStart":2742,"sourceCodeEnd":2778,"githubUrl":"https://github.com/abhigyanpatwari/GitNexus/blob/52924ef12c2290ceee4612526a828ec4cdf2047f/gitnexus/src/core/analyzer-identity.ts#L2742-L2778","documentation":"Analyzer identity computation is designed to be atomic against filesystem mutation: it snapshots the build tree, then re-collects build entries and deep-compares. If the two snapshots differ, the build changed underneath the computation and the resulting identity would describe a state that never existed, so it throws with the build root. This is a deliberate race detector, not a flaky failure.","triggerScenarios":"Anything that writes to buildRoot between hashBuildTree() and the post-check: a concurrent npm install/rebuild, tsc --build running in watch mode, an editor or sync client touching files, or a dev-mode watcher recompiling while analyze runs.","commonSituations":"Running `gitnexus analyze` in one terminal while `npm run dev` (tsx watch) recompiles in another; CI where a post-install step rebuilds native modules during the run; Dropbox/OneDrive sync mutating mtimes; Docker volume writes from a sibling container.","solutions":["Stop the concurrent writer (dev watcher, parallel install) and re-run analyze — identity computation is fast once stable.","In CI, sequence steps so no build/install runs concurrently with analysis.","Exclude the analyzer build tree from sync clients and editors' auto-build.","For development of GitNexus itself, complete the build before invoking analyze rather than during."],"exampleFix":"# before: two terminals\nT1: npm run dev          # tsx watch recompiles continuously\nT2: npx gitnexus analyze # Analyzer build changed while its identity was being computed\n\n# after: build first, then analyze\nT1: npm run build && npm run dev &\nT2: sleep 5 && npx gitnexus analyze","handlingStrategy":"retry","validationCode":"// Skip analysis while a build watcher holds the tree:\nimport { execSync } from 'node:child_process';\nfunction noActiveBuildWriter(): boolean {\n  try {\n    const ps = execSync('ps ax -o command=', { encoding: 'utf8' });\n    return !/\\b(tsc|tsx|esbuild|npm run (dev|build))\\b/.test(ps);\n  } catch {\n    return true;\n  }\n}","typeGuard":null,"tryCatchPattern":"try {\n  await analyze({ repo: '.' });\n} catch (err) {\n  if (err instanceof Error && /build changed while its identity was being computed/.test(err.message)) {\n    await waitForQuiescentTree(buildRoot); // poll mtimes until stable, then single retry\n    return analyze({ repo: '.' });\n  }\n  throw err;\n}","preventionTips":["Sequence CI: build fully, then analyze; never run tsc watch during analysis of the install.","Run analyze against released, immutable installs rather than actively-developed trees.","Keep sync clients and editors' auto-build away from the analyzer installation.","Retry at most once after quiescence — repeated failures mean a persistent writer, not a race."],"tags":["analyzer-identity","race-condition","filesystem","concurrent-modification"],"backgroundTag":"concurrent-modification-detected","analyzedSha":"52924ef12c2290ceee4612526a828ec4cdf2047f","analyzedAt":"2026-08-20T23:29:22.980Z","contentChangedAt":"2026-08-20T23:29:22.980Z","schemaVersion":2},"datasetVersion":"2026-09-23T08:17:48.524Z"}