Function symlinkDirectories

src/utils/worktree.ts:102–138

* Symlinks directories from the main repository to avoid duplication. * This prevents disk bloat from duplicating node_modules and other large directories. * * @param repoRootPath - Path to the main repository root * @param worktreePath - Path to the worktree directory * @param dirsToSymlink -

(
  repoRootPath: string,
  worktreePath: string,
  dirsToSymlink: string[],
)

 * @param dirsToSymlink - Array of directory names to symlink (e.g., ['node_modules'])
 */
async function symlinkDirectories(
  repoRootPath: string,
  worktreePath: string,
  dirsToSymlink: string[],
): Promise<void> {
  for (const dir of dirsToSymlink) {
    // Validate directory doesn't escape repository boundaries
    if (containsPathTraversal(dir)) {
      logForDebugging(
        `Skipping symlink for "${dir}": path traversal detected`,
        { level: 'warn' },
      )
      continue
    }

    const sourcePath = join(repoRootPath, dir)
    const destPath = join(worktreePath, dir)

    try {
      await symlink(sourcePath, destPath, 'dir')
      logForDebugging(
        `Symlinked ${dir} from main repository to worktree to avoid disk bloat`,
      )
    } catch (error) {
      const code = getErrnoCode(error)
      // ENOENT: source doesn't exist yet (expected - skip silently)
      // EEXIST: destination already exists (expected - skip silently)
      if (code !== 'ENOENT' && code !== 'EEXIST') {
        // Unexpected error (e.g., permission denied, unsupported platform)
        logForDebugging(
          `Failed to symlink ${dir} (${code ?? 'unknown'}): ${errorMessage(error)}`,
          { level: 'warn' },
        )
      }
    }
  }
}

export type WorktreeSession = {
  originalCwd: string