+def CheckWorktreeIsAvailable(git_dir):
+ """Check if git-worktree functionality is available
+
+ Args:
+ git_dir: The repository to test in
+
+ Returns:
+ True if git-worktree commands will work, False otherwise.
+ """
+ pipe = ['git', '--git-dir', git_dir, 'worktree', 'list']
+ result = command.RunPipe([pipe], capture=True, capture_stderr=True,
+ raise_on_error=False)
+ return result.return_code == 0
+
+def AddWorktree(git_dir, output_dir, commit_hash=None):
+ """Create and checkout a new git worktree for this build
+
+ Args:
+ git_dir: The repository to checkout the worktree from
+ output_dir: Path for the new worktree
+ commit_hash: Commit hash to checkout
+ """
+ # We need to pass --detach to avoid creating a new branch
+ pipe = ['git', '--git-dir', git_dir, 'worktree', 'add', '.', '--detach']
+ if commit_hash:
+ pipe.append(commit_hash)
+ result = command.RunPipe([pipe], capture=True, cwd=output_dir,
+ capture_stderr=True)
+ if result.return_code != 0:
+ raise OSError('git worktree add: %s' % result.stderr)
+
+def PruneWorktrees(git_dir):
+ """Remove administrative files for deleted worktrees
+
+ Args:
+ git_dir: The repository whose deleted worktrees should be pruned
+ """
+ pipe = ['git', '--git-dir', git_dir, 'worktree', 'prune']
+ result = command.RunPipe([pipe], capture=True, capture_stderr=True)
+ if result.return_code != 0:
+ raise OSError('git worktree prune: %s' % result.stderr)
+
+def CreatePatches(branch, start, count, ignore_binary, series):