What causes "Couldn't find curent branch." in nodejs/node?

Check out a real branch: `git switch -c ` or `git checkout `.

nodejs/node · error · Exception

Couldn't find curent branch.

Error message

Couldn't find curent branch.

What it means

GitCurrentBranch parses `git status -s -b -uno` and looks for a line matching `^## (.+)` (the branch-tracking summary). If no such line appears, the repo is in a state without a current branch (detached HEAD, empty/unborn repo, or cwd is not a git worktree).

Source

Thrown at deps/v8/tools/release/git_recipes.py:162

  def GitChangedFiles(self, git_hash, **kwargs):
    assert git_hash
    try:
      files = self.Git(MakeArgs(["diff --name-only",
                                 git_hash,
                                 "%s^" % git_hash]), **kwargs)
      return map(str.strip, files.splitlines())
    except GitFailedException:  # pragma: no cover
      # Git fails using "^" at branch roots.
      return []


  @Strip
  def GitCurrentBranch(self, **kwargs):
    for line in self.Git("status -s -b -uno", **kwargs).strip().splitlines():
      match = re.match(r"^## (.+)", line)
      if match: return match.group(1)
    raise Exception("Couldn't find curent branch.")  # pragma: no cover

  @Strip
  def GitLog(self, n=0, format="", grep="", git_hash="", parent_hash="",
             branch="", path=None, reverse=False, **kwargs):
    assert not (git_hash and parent_hash)
    args = ["log"]
    if n > 0:
      args.append("-%d" % n)
    if format:
      args.append("--format=%s" % format)
    if grep:
      args.append("--grep=\"%s\"" % grep.replace("\"", "\\\""))
    if reverse:
      args.append("--reverse")
    if git_hash:
      args.append(git_hash)
    if parent_hash:
      args.append("%s^" % parent_hash)

View on GitHub (pinned to 1b2de5e052)

Solutions

Check out a real branch: `git switch -c <branch>` or `git checkout <branch>`.
Avoid running release scripts on a detached HEAD.
Confirm the cwd is inside the right worktree (has a .git).

Example fix

// before
# repo is in detached HEAD
v8/tools/release/push_to_candidates.py ...
// after
git checkout main
v8/tools/release/push_to_candidates.py ...

Defensive patterns

Strategy: validation

Validate before calling

import subprocess
out = subprocess.run(['git', 'status', '-s', '-b', '-uno'],
                     capture_output=True, text=True, check=True).stdout
assert any(line.startswith('## ') for line in out.splitlines()), (
    'no current branch; check out a branch (not detached HEAD)')

Prevention

Always check out a real branch before running release scripts.
In CI, avoid detached-HEAD checkouts for branch-aware tooling.
Verify cwd is inside the intended worktree.

When it happens

Trigger: Running release scripts on a detached HEAD, on a freshly-init'd repo with no commits, or outside any git worktree.

Common situations: CI checkout in detached-HEAD mode; release tooling run on a tag/SHA instead of a branch; wrong cwd; empty repo.

Related errors

AI-assisted analysis of nodejs/node@1b2de5e052 (2026-08-13). Data as JSON: /api/errors/6e7eedaeddd7f58d. Report an issue: GitHub.