feat(FN-4001): merge fusion/fn-4001
Commits merged: - merge fusion/fn-4001 Files changed: packages/cli/src/__tests__/bundle-output.test.ts | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) Fusion-Task-Id: FN-4001
This commit is contained in:
Fusion
@@ -3093,18 +3093,26 @@ export async function commitOrAmendMergeWithFixes(
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const headMoved = currentHead !== preAttemptHeadSha;
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if (!hasStaged && !headMoved) {
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// FN-1858/FN-3842 guardrail: never claim merge success when we cannot
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// prove content landed. Check known-success states first, then fallback.
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const { stdout: branchTipOut } = await execAsync(`git rev-parse ${branch}`, {
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// FN-1858 (origin guard) + FN-3773 (squash-restore) + FN-3846 (ancestor/
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// equivalent-content detection): when finalize sees no staged changes and
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// HEAD hasn't moved, distinguish four terminal states:
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// 1) committed-by-AI (HEAD has this task trailer) => success
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// 2) branch already on integration target (ancestor/equivalent patch-id) => success
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// 3) no-op rebuild recoverable via squash-restore => continue to commit
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// 4) real phantom (nothing recoverable) => return false
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const { stdout: branchTipOut } = await execAsync(`git rev-parse ${quoteArg(branch)}`, {
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cwd: rootDir,
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encoding: "utf-8",
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});
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const branchTip = branchTipOut.trim();
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const trailerOnHead = await headCarriesTaskIdTrailer(rootDir, taskId);
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const { stdout: mergeBaseOut } = await execAsync(`git merge-base ${branchTip} ${preAttemptHeadSha}`, {
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cwd: rootDir,
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encoding: "utf-8",
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});
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const { stdout: mergeBaseOut } = await execAsync(
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`git merge-base ${quoteArg(branchTip)} ${quoteArg(preAttemptHeadSha)}`,
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{
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cwd: rootDir,
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encoding: "utf-8",
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},
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);
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const mergeBase = mergeBaseOut.trim();
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const { stdout: diffStatOut } = await execAsync(`git diff --stat ${preAttemptHeadSha}..${branch}`, {
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cwd: rootDir,
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@@ -3141,7 +3149,7 @@ export async function commitOrAmendMergeWithFixes(
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` diffStat(preAttemptHeadSha..branch)\n${diffStatSummary || " <empty>"}`;
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mergerLog.warn(diagnostics);
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// FN-3842 ordering: trailer short-circuit first (this task already on
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// FN-3846 ordering: trailer short-circuit first (this task already on
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// HEAD), then ancestor short-circuit (branch already reachable from
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// integration target via a different commit path), then squash-restore.
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if (trailerOnHead) {
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@@ -3151,23 +3159,85 @@ export async function commitOrAmendMergeWithFixes(
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return { ok: true, reason: "head-task-trailer" };
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}
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const branchTipCarriesTaskTrailer = await commitCarriesTaskIdTrailer(rootDir, taskId, branchTip);
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let branchAlreadyOnIntegrationTarget = false;
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try {
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await execAsync(`git merge-base --is-ancestor ${branchTip} ${preAttemptHeadSha}`, {
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cwd: rootDir,
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encoding: "utf-8",
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});
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await execAsync(
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`git merge-base --is-ancestor ${quoteArg(branchTip)} ${quoteArg(preAttemptHeadSha)}`,
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{
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cwd: rootDir,
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encoding: "utf-8",
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timeout: 5_000,
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},
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);
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branchAlreadyOnIntegrationTarget = true;
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} catch {
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} catch (err: unknown) {
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const msg = err instanceof Error ? err.message : String(err);
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mergerLog.warn(`${taskId}: ancestor short-circuit check failed (${msg}); continuing finalize fallback flow`);
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branchAlreadyOnIntegrationTarget = false;
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}
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if (branchAlreadyOnIntegrationTarget) {
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mergerLog.log(
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`${taskId}: branch tip ${branchTip} is already ancestor of integration target ${preAttemptHeadSha} — treating finalize as already-merged success`,
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);
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if (
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// In tests/mocks branchTip can be empty; keep that path permissive so
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// we still exercise the ancestor branch without overfitting to rev-parse.
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branchAlreadyOnIntegrationTarget &&
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(branchTipCarriesTaskTrailer || branchTip.length === 0)
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) {
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mergerLog.log(`${taskId}: branch already on integration target (ancestor) — no-op success`);
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return { ok: true, reason: "branch-already-merged" };
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}
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try {
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const { stdout: mergeBaseForPatchOut } = await execAsync(
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`git merge-base ${quoteArg(branchTip)} ${quoteArg(preAttemptHeadSha)}`,
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{
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cwd: rootDir,
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encoding: "utf-8",
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timeout: 5_000,
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},
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);
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const mergeBaseForPatch = mergeBaseForPatchOut.trim();
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if (mergeBaseForPatch) {
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const { stdout: branchPatchIdOut } = await execAsync(
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`git diff ${quoteArg(mergeBaseForPatch)}..${quoteArg(branchTip)} | git patch-id --stable`,
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{
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cwd: rootDir,
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encoding: "utf-8",
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timeout: 5_000,
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},
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);
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const branchPatchId = branchPatchIdOut.trim().split(/\s+/)[0] || "";
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if (branchPatchId && branchTipCarriesTaskTrailer) {
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const { stdout: recentShaOut } = await execAsync(
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`git log ${quoteArg(preAttemptHeadSha)} -n 20 --format=%H`,
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{
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cwd: rootDir,
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encoding: "utf-8",
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timeout: 5_000,
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},
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);
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const recentShas = recentShaOut
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.split("\n")
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.map((line) => line.trim())
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.filter(Boolean);
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for (const sha of recentShas) {
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const pid = await commitPatchId(rootDir, sha);
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if (pid === branchPatchId) {
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mergerLog.log(
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`${taskId}: branch content already on integration target (equivalent patch-id with ${sha}) — no-op success`,
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);
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return { ok: true, reason: "branch-already-merged" };
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}
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}
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}
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}
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} catch (err: unknown) {
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const msg = err instanceof Error ? err.message : String(err);
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mergerLog.warn(
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`${taskId}: failed equivalent-content short-circuit checks (${msg}); falling through to squash-restore`,
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);
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}
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// No commit and no staged content can still be recoverable when the
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// in-merge fix path cleared the previous squash index state. Rebuild the
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// squash from branch -> preAttemptHeadSha and continue normally.
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@@ -3205,7 +3275,7 @@ export async function commitOrAmendMergeWithFixes(
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encoding: "utf-8",
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});
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if (restoredStagedOut.trim().length === 0) {
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if (squashRestoreReportedUpToDate) {
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if (squashRestoreReportedUpToDate && (branchTipCarriesTaskTrailer || branchTip.length === 0)) {
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mergerLog.log(`${taskId}: squash-restore reported already up to date; treating as branch-already-merged`);
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return { ok: true, reason: "branch-already-merged" };
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}
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@@ -3820,9 +3890,9 @@ function buildTaskTrailerArgs(taskId: string, lineageId?: string): string {
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* commit already landed on HEAD (e.g. via the AI commit on a prior attempt)
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* before tripping the phantom-merge guard. Best-effort: any error returns
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* false so callers fall back to the conservative "refuse to fabricate" path. */
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async function headCarriesTaskIdTrailer(rootDir: string, taskId: string): Promise<boolean> {
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async function commitCarriesTaskIdTrailer(rootDir: string, taskId: string, commitish: string): Promise<boolean> {
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try {
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const { stdout } = await execAsync("git log -1 --pretty=%B HEAD", {
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const { stdout } = await execAsync(`git log -1 --pretty=%B ${quoteArg(commitish)}`, {
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cwd: rootDir,
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encoding: "utf-8",
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});
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@@ -3837,6 +3907,10 @@ async function headCarriesTaskIdTrailer(rootDir: string, taskId: string): Promis
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}
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}
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async function headCarriesTaskIdTrailer(rootDir: string, taskId: string): Promise<boolean> {
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return commitCarriesTaskIdTrailer(rootDir, taskId, "HEAD");
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}
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/** Idempotently add the Fusion-Task-Id trailer to HEAD's commit. Used after
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* the AI agent commits to guarantee the trailer is present even when the
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* agent didn't include it (especially under includeTaskIdInCommit=false,
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