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feat(FN-4428): add contamination auto-recovery executor flow

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Fusion-Task-Id: FN-4428
Fusion-Task-Lineage: ea174f50-49ac-4105-b6cf-db3bab0984fd
This commit is contained in:
Fusion
2026-05-14 01:44:04 -07:00
committed by gsxdsm
parent d672e53970
commit 406632df7c
2 changed files with 171 additions and 49 deletions
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149
packages/engine/src/__tests__/executor-contamination-base.test.ts
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@@ -1,19 +1,12 @@
import { beforeEach, describe, expect, it, vi } from "vitest";
import "./executor-test-helpers.js";
import { TaskExecutor } from "../executor.js";
import { createMockStore, mockedExec, resetExecutorMocks } from "./executor-test-helpers.js";
import { createMockStore, mockedCreateFnAgent, mockedExec, resetExecutorMocks } from "./executor-test-helpers.js";
import * as branchConflicts from "../branch-conflicts.js";
/**
* FN-4417 regression: the contamination check must compute its own fresh
* merge-base against the integration branch, not reuse `task.baseCommitSha`.
*
* Before FN-4417, on a freshly pool-acquired worktree (branch force-reset to
* current main) the executor passed `task.baseCommitSha` to the contamination
* `git log <base>..<branch>` query. When that stored SHA was stale, every
* legitimately-merged commit on main since the stale SHA appeared as a
* "foreign task-attributed commit" and the task was paused with
* `pausedReason: "branch-cross-contamination"`. FN-4403 hit this with 157
* false-positive foreign commits across ~39 unrelated FN-* tasks.
*/
describe("resolveContaminationBaseRef (FN-4417)", () => {
beforeEach(() => {
@@ -24,31 +17,17 @@ describe("resolveContaminationBaseRef (FN-4417)", () => {
const calls: string[] = [];
mockedExec.mockImplementation(((cmd: any, _opts: any, cb: any) => {
calls.push(String(cmd));
if (String(cmd).includes("merge-base")) {
cb(null, "fresh_main_sha\n");
} else {
cb(null, "");
}
if (String(cmd).includes("merge-base")) cb(null, "fresh_main_sha\n");
else cb(null, "");
return {} as any;
}) as any);
const store = createMockStore();
const executor = new TaskExecutor(store, "/tmp/test");
const result = await (executor as any).resolveContaminationBaseRef(
"/tmp/test/.worktrees/swift-delta",
);
const executor = new TaskExecutor(createMockStore(), "/tmp/test");
const result = await (executor as any).resolveContaminationBaseRef("/tmp/test/.worktrees/swift-delta");
expect(result).toBe("fresh_main_sha");
// Must have asked for merge-base against local main first (preferred
// over origin/main, which can lag local main by hundreds of commits on
// dev machines and re-introduce the FN-4417 false positive). Must not
// fall back to HEAD~1 (which on a force-reset branch is a commit on
// main itself).
const mergeBaseCall = calls.find((c) => c.includes("merge-base"));
expect(mergeBaseCall).toBeDefined();
// Local `main` must appear before `origin/main` in the command so the
// shell `||` fallback prefers it.
const localMainIdx = mergeBaseCall!.indexOf("merge-base HEAD main");
const originMainIdx = mergeBaseCall!.indexOf("merge-base HEAD origin/main");
expect(localMainIdx).toBeGreaterThanOrEqual(0);
@@ -62,39 +41,111 @@ describe("resolveContaminationBaseRef (FN-4417)", () => {
return {} as any;
}) as any);
const store = createMockStore();
const executor = new TaskExecutor(store, "/tmp/test");
const result = await (executor as any).resolveContaminationBaseRef(
"/tmp/test/.worktrees/swift-delta",
);
// Caller (execute()) treats undefined as "skip contamination check"
// rather than crash the run on git failure.
const executor = new TaskExecutor(createMockStore(), "/tmp/test");
const result = await (executor as any).resolveContaminationBaseRef("/tmp/test/.worktrees/swift-delta");
expect(result).toBeUndefined();
});
it("does NOT fall back to task.baseCommitSha (FN-4417 false-positive guard)", async () => {
// Simulate the exact FN-4403 condition: merge-base succeeds with a fresh
// SHA. Even if a stale baseCommitSha is on the task, the contamination
// base resolver must use the fresh merge-base output.
mockedExec.mockImplementation(((cmd: any, _opts: any, cb: any) => {
cb(null, String(cmd).includes("merge-base") ? "currentMainSHA\n" : "");
return {} as any;
}) as any);
const store = createMockStore();
const executor = new TaskExecutor(store, "/tmp/test");
// resolveContaminationBaseRef takes only worktreePath — it has no API
// surface that accepts task.baseCommitSha. That is the structural
// guarantee of the fix.
const result = await (executor as any).resolveContaminationBaseRef(
"/tmp/test/.worktrees/swift-delta",
);
const executor = new TaskExecutor(createMockStore(), "/tmp/test");
const result = await (executor as any).resolveContaminationBaseRef("/tmp/test/.worktrees/swift-delta");
expect(result).toBe("currentMainSHA");
// Sanity: function arity is 1, not 2 (no baseCommitSha parameter).
expect((executor as any).resolveContaminationBaseRef.length).toBe(1);
});
});
describe("branch cross-contamination recovery (FN-4428)", () => {
beforeEach(() => {
resetExecutorMocks();
mockedExec.mockImplementation(((_cmd: any, _opts: any, cb: any) => {
cb(null, "");
return {} as any;
}) as any);
mockedCreateFnAgent.mockResolvedValue({ session: { prompt: vi.fn(), close: vi.fn(), dispose: vi.fn() }, sessionFile: null } as any);
});
function makeTask(recoveryRetryCount?: number) {
return {
id: "FN-4428",
title: "Test",
description: "Test",
column: "in-progress",
dependencies: [],
steps: [],
currentStep: 0,
log: [],
recoveryRetryCount,
createdAt: new Date().toISOString(),
updatedAt: new Date().toISOString(),
} as any;
}
it("auto-recovers when all foreign commits are already-upstream", async () => {
const store = createMockStore();
const contamination = new branchConflicts.BranchCrossContaminationError({
branchName: "fusion/fn-4428",
baseSha: "abc123",
taskId: "FN-4428",
foreignCommits: [{ sha: "1111111111111111111111111111111111111111", subject: "feat(FN-4412): upstream", foreignTaskId: "FN-4412" }],
});
mockedCreateFnAgent.mockRejectedValueOnce(contamination);
vi.spyOn(branchConflicts, "classifyForeignCommits").mockResolvedValueOnce({ alreadyUpstream: contamination.foreignCommits, unique: [] });
vi.spyOn(branchConflicts, "autoRecoverCrossContamination").mockResolvedValueOnce({
newTipSha: "2222222222222222222222222222222222222222",
droppedShas: ["1111111111111111111111111111111111111111"],
});
const executor = new TaskExecutor(store, "/tmp/test");
await executor.execute(makeTask());
expect(store.moveTask).toHaveBeenCalledWith("FN-4428", "todo", { preserveResumeState: true });
expect(store.updateTask).toHaveBeenCalledWith("FN-4428", expect.objectContaining({ paused: false, pausedReason: null, recoveryRetryCount: 1 }));
expect(store.logEntry).toHaveBeenCalledWith("FN-4428", expect.stringContaining("auto-recovered branch-cross-contamination"), undefined, expect.any(Object));
});
it("escalates to paused failure when unique foreign commits remain", async () => {
const store = createMockStore();
const contamination = new branchConflicts.BranchCrossContaminationError({
branchName: "fusion/fn-4428",
baseSha: "abc123",
taskId: "FN-4428",
foreignCommits: [{ sha: "3333333333333333333333333333333333333333", subject: "feat(FN-4410): unique", foreignTaskId: "FN-4410" }],
});
mockedCreateFnAgent.mockRejectedValueOnce(contamination);
vi.spyOn(branchConflicts, "classifyForeignCommits").mockResolvedValueOnce({ alreadyUpstream: [], unique: contamination.foreignCommits });
const executor = new TaskExecutor(store, "/tmp/test");
await executor.execute(makeTask());
expect(store.updateTask).toHaveBeenCalledWith("FN-4428", expect.objectContaining({ status: "failed", paused: true, pausedReason: "branch-cross-contamination" }));
});
it("escalates immediately when auto-recovery was already attempted", async () => {
const store = createMockStore();
const contamination = new branchConflicts.BranchCrossContaminationError({
branchName: "fusion/fn-4428",
baseSha: "abc123",
taskId: "FN-4428",
foreignCommits: [{ sha: "4444444444444444444444444444444444444444", subject: "feat(FN-4412): upstream", foreignTaskId: "FN-4412" }],
});
mockedCreateFnAgent.mockRejectedValueOnce(contamination);
vi.spyOn(branchConflicts, "classifyForeignCommits").mockResolvedValueOnce({ alreadyUpstream: contamination.foreignCommits, unique: [] });
const autoRecoverSpy = vi.spyOn(branchConflicts, "autoRecoverCrossContamination");
const executor = new TaskExecutor(store, "/tmp/test");
await executor.execute(makeTask(1));
expect(autoRecoverSpy).not.toHaveBeenCalled();
expect(store.logEntry).toHaveBeenCalledWith("FN-4428", expect.stringContaining("auto-recovery already attempted"), undefined, expect.objectContaining({ agentId: "executor" }));
expect(store.updateTask).toHaveBeenCalledWith("FN-4428", expect.objectContaining({ status: "failed", paused: true, pausedReason: "branch-cross-contamination" }));
});
});