fix(engine): harden worktree lifecycle and seed frontend UX criteria
Atomic worktree creation: on `git worktree add` failure, remove the partial directory so retries see a clean slate (executor.ts, step-session-executor.ts). Add `reapOrphanWorktrees()` sweep on engine startup to delete `.worktrees/*` dirs that have no `.git` file and are not registered with git. Force readonly workflow steps to run pre-merge so review personas reuse the coding worktree instead of allocating a fresh post-merge one. Inject a Frontend UX Criteria checklist into TRIAGE_SYSTEM_PROMPT when a task touches dashboard UI, so the first coding pass can meet UX reviewer expectations. Motivated by FN-2185 post-mortem: an incomplete `.worktrees/pale-raven` dir blocked retries, and three Step 6 revision cycles over cosmetic UX issues consumed ~13 hours. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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gsxdsm
@@ -40,6 +40,7 @@ vi.mock("node:child_process", async () => {
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vi.mock("node:fs", () => ({
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existsSync: vi.fn().mockReturnValue(true),
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lstatSync: vi.fn().mockReturnValue({ isDirectory: () => true, isSymbolicLink: () => false }),
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readdirSync: vi.fn().mockReturnValue([]),
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rmSync: vi.fn(),
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}));
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@@ -49,14 +50,16 @@ import {
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getRegisteredWorktreePaths,
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scanIdleWorktrees,
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cleanupOrphanedWorktrees,
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reapOrphanWorktrees,
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scanOrphanedBranches,
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} from "./worktree-pool.js";
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import { execSync } from "node:child_process";
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import { existsSync, readdirSync, rmSync } from "node:fs";
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import { existsSync, lstatSync, readdirSync, rmSync } from "node:fs";
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import type { Task, Column } from "@fusion/core";
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const mockedExecSync = vi.mocked(execSync);
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const mockedExistsSync = vi.mocked(existsSync);
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const mockedLstatSync = vi.mocked(lstatSync);
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const mockedReaddirSync = vi.mocked(readdirSync);
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const mockedRmSync = vi.mocked(rmSync);
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@@ -878,3 +881,203 @@ describe("scanOrphanedBranches", () => {
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expect(orphaned).toContain("fusion/fn-002");
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});
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});
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// ── reapOrphanWorktrees tests ─────────────────────────────────────────
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describe("reapOrphanWorktrees", () => {
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beforeEach(() => {
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vi.clearAllMocks();
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// Default: .worktrees/ exists, lstatSync returns a real directory (not a symlink)
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mockedExistsSync.mockReturnValue(true);
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mockedLstatSync.mockReturnValue({ isDirectory: () => true, isSymbolicLink: () => false } as any);
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mockedReaddirSync.mockReturnValue([]);
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// Default: no registered worktrees
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mockedExecSync.mockImplementation((cmd: any) => {
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if (String(cmd) === "git worktree list --porcelain") {
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return "worktree /root\nHEAD abc123\nbranch refs/heads/main\n\n" as any;
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}
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return Buffer.from("");
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});
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});
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it("returns 0 when .worktrees/ does not exist", async () => {
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mockedExistsSync.mockReturnValue(false);
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const removed = await reapOrphanWorktrees("/root");
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expect(removed).toBe(0);
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expect(mockedRmSync).not.toHaveBeenCalled();
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});
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it("returns 0 when .worktrees/ is empty", async () => {
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mockedReaddirSync.mockReturnValue([] as any);
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const removed = await reapOrphanWorktrees("/root");
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expect(removed).toBe(0);
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expect(mockedRmSync).not.toHaveBeenCalled();
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});
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it("removes a directory that has no .git file and is not registered", async () => {
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mockedReaddirSync.mockReturnValue([makeDirEntry("pale-raven")] as any);
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// .gitkeep exists but NOT a .git file — simulate with existsSync returning false for .git
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mockedExistsSync.mockImplementation((p: any) => {
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if (String(p) === "/root/.worktrees") return true;
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if (String(p).endsWith("/.git")) return false;
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return true;
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});
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const removed = await reapOrphanWorktrees("/root");
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expect(removed).toBe(1);
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expect(mockedRmSync).toHaveBeenCalledWith("/root/.worktrees/pale-raven", {
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recursive: true,
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force: true,
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});
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});
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it("does NOT remove a directory that is a registered git worktree", async () => {
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mockedReaddirSync.mockReturnValue([makeDirEntry("swift-falcon")] as any);
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mockedExecSync.mockImplementation((cmd: any) => {
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if (String(cmd) === "git worktree list --porcelain") {
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return [
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"worktree /root",
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"HEAD abc123",
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"branch refs/heads/main",
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"",
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"worktree /root/.worktrees/swift-falcon",
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"HEAD def456",
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"branch refs/heads/fusion/swift-falcon",
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"",
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].join("\n") as any;
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}
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return Buffer.from("");
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});
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const removed = await reapOrphanWorktrees("/root");
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expect(removed).toBe(0);
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expect(mockedRmSync).not.toHaveBeenCalled();
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});
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it("does NOT remove a directory that has a .git file (may be partially registered)", async () => {
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mockedReaddirSync.mockReturnValue([makeDirEntry("amber-wolf")] as any);
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mockedExistsSync.mockImplementation((p: any) => {
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if (String(p) === "/root/.worktrees") return true;
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if (String(p) === "/root/.worktrees/amber-wolf/.git") return true;
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return true;
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});
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const removed = await reapOrphanWorktrees("/root");
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expect(removed).toBe(0);
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expect(mockedRmSync).not.toHaveBeenCalled();
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});
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it("does NOT remove symlinks", async () => {
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mockedReaddirSync.mockReturnValue([
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{ name: "linked-wt", isDirectory: () => true } as any,
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] as any);
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mockedLstatSync.mockReturnValue({ isDirectory: () => true, isSymbolicLink: () => true } as any);
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const removed = await reapOrphanWorktrees("/root");
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expect(removed).toBe(0);
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expect(mockedRmSync).not.toHaveBeenCalled();
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});
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it("handles multiple orphans and multiple registered worktrees correctly", async () => {
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mockedReaddirSync.mockReturnValue([
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makeDirEntry("orphan-1"),
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makeDirEntry("orphan-2"),
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makeDirEntry("good-wt"),
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] as any);
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mockedExecSync.mockImplementation((cmd: any) => {
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if (String(cmd) === "git worktree list --porcelain") {
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return [
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"worktree /root",
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"HEAD abc123",
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"branch refs/heads/main",
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"",
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"worktree /root/.worktrees/good-wt",
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"HEAD def456",
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"branch refs/heads/fusion/good-wt",
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"",
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].join("\n") as any;
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}
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return Buffer.from("");
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});
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mockedExistsSync.mockImplementation((p: any) => {
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const ps = String(p);
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if (ps === "/root/.worktrees") return true;
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if (ps.endsWith("/.git")) return false;
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return true;
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});
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const removed = await reapOrphanWorktrees("/root");
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expect(removed).toBe(2);
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expect(mockedRmSync).toHaveBeenCalledWith("/root/.worktrees/orphan-1", {
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recursive: true,
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force: true,
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});
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expect(mockedRmSync).toHaveBeenCalledWith("/root/.worktrees/orphan-2", {
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recursive: true,
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force: true,
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});
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expect(mockedRmSync).not.toHaveBeenCalledWith(
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expect.stringContaining("good-wt"),
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expect.anything(),
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);
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});
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it("continues and logs a warning when rmSync throws for one orphan", async () => {
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mockedReaddirSync.mockReturnValue([
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makeDirEntry("bad-orphan"),
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makeDirEntry("good-orphan"),
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] as any);
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mockedExistsSync.mockImplementation((p: any) => {
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const ps = String(p);
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if (ps === "/root/.worktrees") return true;
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if (ps.endsWith("/.git")) return false;
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return true;
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});
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let callCount = 0;
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mockedRmSync.mockImplementation(() => {
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callCount++;
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if (callCount === 1) throw new Error("permission denied");
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});
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const removed = await reapOrphanWorktrees("/root");
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// Only the second one succeeds
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expect(removed).toBe(1);
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expect(warnSpy).toHaveBeenCalledWith(
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expect.stringContaining("reapOrphanWorktrees: failed to remove bad-orphan"),
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);
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});
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it("returns 0 and logs warning when git worktree list fails", async () => {
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mockedReaddirSync.mockReturnValue([makeDirEntry("some-dir")] as any);
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mockedExecSync.mockImplementation((cmd: any) => {
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if (String(cmd) === "git worktree list --porcelain") {
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throw new Error("not a git repo");
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}
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return Buffer.from("");
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});
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mockedExistsSync.mockImplementation((p: any) => {
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const ps = String(p);
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if (ps === "/root/.worktrees") return true;
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if (ps.endsWith("/.git")) return false;
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return true;
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});
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// When git list fails, getRegisteredWorktreePaths returns an empty Set,
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// so any unregistered dir without a .git file would be reaped.
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// In this test we verify behavior is safe: no crash, returns a count.
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const removed = await reapOrphanWorktrees("/root");
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// some-dir has no .git, not registered (empty set due to failure) — gets reaped
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expect(removed).toBe(1);
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// The warn from getRegisteredWorktreePaths should appear
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expect(warnSpy).toHaveBeenCalledWith(
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expect.stringContaining("Failed to list registered worktrees"),
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);
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});
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});
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