project: migrate worktree .git/ dirs to symlinks

Historically we created a .git/ subdir in each source checkout and
symlinked individual files to the .repo/projects/ paths.  This layer
of indirection isn't actually needed: the .repo/projects/ paths are
guaranteed to only ever have a 1-to-1 mapping with the actual git
checkout.  So we don't need to worry about having files in .git/ be
isolated.

To that end, change how we manage the actual project checkouts from
a dir full of symlinks (and a few files) to a symlink to the internal
.repo/projects/ dir.  This makes the code simpler & faster.

The directory structure we have today is:
.repo/
  project-objects/chromiumos/third_party/kernel.git/
    <paths omitted as not relevant to this change>
  projects/src/third_party/kernel/
    v3.8.git/
      config
      description   -> …/project-objects/…/config
      FETCH_HEAD
      HEAD
      hooks/        -> …/project-objects/…/hooks/
      info/         -> …/project-objects/…/info/
      logs/
      objects/      -> …/project-objects/…/objects/
      packed-refs
      refs/
      rr-cache/     -> …/project-objects/…/rr-cache/
src/third_party/kernel/
  v3.8/
    .git/
      config        -> …/projects/…/v3.8.git/config
      description   -> …/project-objects/…/v3.8.git/description
      HEAD
      hooks/        -> …/project-objects/…/v3.8.git/hooks/
      index
      info/         -> …/project-objects/…/v3.8.git/info/
      logs/         -> …/projects/…/v3.8.git/logs/
      objects/      -> …/project-objects/…/v3.8.git/objects/
      packed-refs   -> …/projects/…/v3.8.git/packed-refs
      refs/         -> …/projects/…/v3.8.git/refs/
      rr-cache/     -> …/project-objects/…/v3.8.git/rr-cache/

The directory structure we have after this commit:
.repo/
  <nothing changes>
src/third_party/kernel/
  v3.8/
    .git            -> …/projects/…/v3.8.git

Bug: https://crbug.com/gerrit/15273
Change-Id: I9dd8def23fbfb2f4cb209a93f8b1b2b24002a444
Reviewed-on: https://gerrit-review.googlesource.com/c/git-repo/+/323695
Reviewed-by: Mike Nichols <mikenichols@google.com>
Reviewed-by: Xin Li <delphij@google.com>
Tested-by: Mike Frysinger <vapier@google.com>
2 files changed
tree: 6e876b45921426afa477472aeb5291e9e31071f0
  1. .github/
  2. docs/
  3. hooks/
  4. man/
  5. release/
  6. subcmds/
  7. tests/
  8. .flake8
  9. .gitattributes
  10. .gitignore
  11. .gitreview
  12. .mailmap
  13. .project
  14. .pydevproject
  15. LICENSE
  16. MANIFEST.in
  17. README.md
  18. SUBMITTING_PATCHES.md
  19. color.py
  20. command.py
  21. completion.bash
  22. editor.py
  23. error.py
  24. event_log.py
  25. fetch.py
  26. git_command.py
  27. git_config.py
  28. git_refs.py
  29. git_ssh
  30. git_superproject.py
  31. git_trace2_event_log.py
  32. gitc_utils.py
  33. hooks.py
  34. main.py
  35. manifest_xml.py
  36. pager.py
  37. platform_utils.py
  38. platform_utils_win32.py
  39. progress.py
  40. project.py
  41. repo
  42. repo_trace.py
  43. requirements.json
  44. run_tests
  45. setup.py
  46. ssh.py
  47. tox.ini
  48. wrapper.py
README.md

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.

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