Function performPostCreationSetup

src/utils/worktree.ts:522–636

* Post-creation setup for a newly created worktree. * Propagates settings.local.json, configures git hooks, and symlinks directories.

(
  repoRoot: string,
  worktreePath: string,
)

 * Propagates settings.local.json, configures git hooks, and symlinks directories.
 */
async function performPostCreationSetup(
  repoRoot: string,
  worktreePath: string,
): Promise<void> {
  // Copy settings.local.json to the worktree's .claude directory
  // This propagates local settings (which may contain secrets) to the worktree
  const localSettingsRelativePath =
    getRelativeSettingsFilePathForSource('localSettings')
  const sourceSettingsLocal = join(repoRoot, localSettingsRelativePath)
  try {
    const destSettingsLocal = join(worktreePath, localSettingsRelativePath)
    await mkdirRecursive(dirname(destSettingsLocal))
    await copyFile(sourceSettingsLocal, destSettingsLocal)
    logForDebugging(
      `Copied settings.local.json to worktree: ${destSettingsLocal}`,
    )
  } catch (e: unknown) {
    const code = getErrnoCode(e)
    if (code !== 'ENOENT') {
      logForDebugging(
        `Failed to copy settings.local.json: ${(e as Error).message}`,
        { level: 'warn' },
      )
    }
  }

  // Configure the worktree to use hooks from the main repository
  // This solves issues with .husky and other git hooks that use relative paths
  const huskyPath = join(repoRoot, '.husky')
  const gitHooksPath = join(repoRoot, '.git', 'hooks')
  let hooksPath: string | null = null
  for (const candidatePath of [huskyPath, gitHooksPath]) {
    try {
      const s = await stat(candidatePath)
      if (s.isDirectory()) {
        hooksPath = candidatePath
        break
      }
    } catch {
      // Path doesn't exist or can't be accessed
    }
  }
  if (hooksPath) {
    // `git config` (no --worktree flag) writes to the main repo's .git/config,
    // shared by all worktrees. Once set, every subsequent worktree create is a
    // no-op — skip the subprocess (~14ms spawn) when the value already matches.
    const gitDir = await resolveGitDir(repoRoot)
    const configDir = gitDir ? ((await getCommonDir(gitDir)) ?? gitDir) : null
    const existing = configDir
      ? await parseGitConfigValue(configDir, 'core', null, 'hooksPath')
      : null
    if (existing !== hooksPath) {
      const { code: configCode, stderr: configError } =
        await execFileNoThrowWithCwd(
          gitExe(),
          ['config', 'core.hooksPath', hooksPath],
          { cwd: worktreePath },
        )