Benchmark: * repo upload frameworks/base: 2.84s -> 0.50s (-82.3%, 5.6x faster) * repo upload (3,045 projects): 7.66s -> 5.24s (-31.6%, 2.42s saved) From repo's inception through v2.56, GetHead() directly read the `.git/HEAD` file in Python. In commit52bab0ba("project: Use git rev-parse to read HEAD"), this was replaced with git subprocess calls on the premise that git provides a dedicated command. However, in large multi-project workspaces (such as Android with 3,000+ projects), spawning thousands of git processes introduced severe latency regressions during `repo upload` and `repo status`. Furthermore, switching to subprocesses broke detached HEADs and unborn branches (fixed in commits7f7d70efand8c3585f3by re-adding the v2.56 file-reading logic as an error recovery fallback). This patch restores fast in-memory reading as the primary path, while adding modern defensive safeguards: * Symbolic refs (`ref: refs/heads/...`): Strips whitespace and tabs and returns the ref directly in memory. * Detached HEAD: Validates 40-char SHA-1 and 64-char SHA-256 commit hashes via git_config.IsId(), normalizing to lowercase. * Symlinks: Detects filesystem symlinks via os.path.islink() and safely falls back to git symbolic-ref. * Fallback: Catches (OSError, AssertionError) and transparently falls back to native git commands for reftables, unexpected layouts, or filesystem errors. Unifies recovery fallback parsing with the fast path (CRLF/tabs, lowercase hashes, and consistent RelPath errors). In addition, this change substantially expands test coverage in tests/test_project.py, adding comprehensive unit tests for symbolic refs, whitespace/tabs, CRLF line endings, SHA-1, SHA-256, uppercase hash normalization, symlinks, corrupted worktrees, and fallback robustness. Test: ./run_tests tests/test_project.py Change-Id: Ib5c2530117c6939e4b9293feda81aa745c003c6a Reviewed-on: https://gerrit-review.googlesource.com/c/git-repo/+/623001 Commit-Queue: James Hawkins <jhawkins@google.com> Reviewed-by: Brian Gan <brgan@google.com> Tested-by: James Hawkins <jhawkins@google.com>
repo
Repo is a tool built on top of Git. Repo helps manage many Git repositories, does the uploads to revision control systems, and automates parts of the development workflow. Repo is not meant to replace Git, only to make it easier to work with Git. The repo command is an executable Python script that you can put anywhere in your path.
- Homepage: https://gerrit.googlesource.com/git-repo/
- Mailing list: repo-discuss on Google Groups
- Bug reports: https://issues.gerritcodereview.com/issues?q=is:open%20componentid:1370071
- Source: https://gerrit.googlesource.com/git-repo/
- Overview: https://source.android.com/source/developing.html
- Docs: https://source.android.com/source/using-repo.html
- repo Manifest Format
- repo Hooks
- Contributing
- Running Repo in Microsoft Windows
- GitHub mirror: https://github.com/GerritCodeReview/git-repo
- Postsubmit tests: https://github.com/GerritCodeReview/git-repo/actions
Contact
Please use the repo-discuss mailing list or issue tracker for questions.
You can file a new bug report under the "repo" component.
Please do not e-mail individual developers for support. They do not have the bandwidth for it, and often times questions have already been asked on repo-discuss or bugs posted to the issue tracker. So please search those sites first.
Install
Many distros include repo, so you might be able to install from there.
# Debian/Ubuntu.
$ sudo apt-get install repo
# Gentoo.
$ sudo emerge dev-vcs/repo
You can install it manually as well as it's a single script.
$ mkdir -p ~/.bin
$ PATH="${HOME}/.bin:${PATH}"
$ curl https://storage.googleapis.com/git-repo-downloads/repo > ~/.bin/repo
$ chmod a+rx ~/.bin/repo
Shell Completion
Repo includes completion scripts for Bash and Zsh.
Bash
To enable completion in Bash, source completion.bash in your ~/.bashrc:
source /path/to/git-repo/completion.bash
Zsh
To enable completion in Zsh, you can either:
-
Copy or symlink
completion.zshto a file named_repoin a directory in your$fpath:mkdir -p ~/.zsh/completion # You can copy the file: cp /path/to/git-repo/completion.zsh ~/.zsh/completion/_repo # Or symlink it: ln -s /path/to/git-repo/completion.zsh ~/.zsh/completion/_repoThen add that directory to your
fpathin~/.zshrcbeforecompinit:fpath=(~/.zsh/completion $fpath) autoload -Uz compinit compinit -
Or source the file directly and call
compdefin your~/.zshrc:source /path/to/git-repo/completion.zsh compdef _repo repo