[path] Handle api.path.checkout_dir better

Previously, using api.path['checkout'] would work, but
api.path.checkout_dir would not. Move the extra handling from Path.get()
(which Path.__getitem__() used) into the checkout_dir property, so
updated uses of checkout directories will still work.

Also, remove checkout_dir as a base in api.path.abs_to_path().
checkout_dir should be within one of the other bases, and removing it
from abs_to_path removes the need to handle uninitialized checkout
bases in abs_to_path.

Bug: 329113288
Change-Id: I1f1e6619ae2add0cd73fbc98eabf747f513b41b5
Reviewed-on: https://chromium-review.googlesource.com/c/infra/luci/recipes-py/+/5456072
Reviewed-by: Yiwei Zhang <yiwzhang@google.com>
Auto-Submit: Rob Mohr <mohrr@google.com>
Commit-Queue: Yiwei Zhang <yiwzhang@google.com>
5 files changed
tree: 430043fe99b41f6b5e6a4c03eacaa3631ebb65dc
  1. doc/
  2. infra/
  3. misc/
  4. recipe_engine/
  5. recipe_modules/
  6. recipe_proto/
  7. recipes/
  8. unittests/
  9. .editorconfig
  10. .gitattributes
  11. .gitignore
  12. .pycharm.vpython3
  13. .style.yapf
  14. .vpython3
  15. .vscode.vpython3
  17. codereview.settings
  20. OWNERS
  21. PRESUBMIT.py
  22. pyproject.toml
  23. README.md
  24. README.recipes.md
  25. recipe.warnings
  26. recipes.py


Recipes are a domain-specific language (embedded in Python) for specifying sequences of subprocess calls in a cross-platform and testable way.

They allow writing build flows which integrate with the rest of LUCI.

Documentation for the recipe engine (including this file!). Take a look at the user guide for some hints on how to get started. See the implementation details doc for more detailed implementation information about the recipe engine.


  • Sign the Google CLA.
  • Make sure your user.email and user.name are configured in git config.

Run the following to setup the code review tool and create your first review:

# Get `depot_tools` in $PATH if you don't have it
git clone https://chromium.googlesource.com/chromium/tools/depot_tools.git $HOME/src/depot_tools
export PATH="$PATH:$HOME/src/depot_tools"

# Check out the recipe engine repo
git clone https://chromium.googlesource.com/infra/luci/recipes-py $HOME/src/recipes-py

# make your change
cd $HOME/src/recipes-py
git new-branch cool_feature
# hack hack
git commit -a -m "This is awesome"

# This will ask for your Google Account credentials.
git cl upload -s -r joe@example.com
# Wait for approval over email.
# Click "Submit to CQ" button or ask reviewer to do it for you.
# Wait for the change to be tested and landed automatically.

Use git cl help and git cl help <cmd> for more details.