Stack diff support for GitHub
Project description
ghstack
Conveniently submit stacks of diffs to GitHub as separate pull requests.
pip install ghstack
How to use
Prepare a series of commits on top of master, then run ghstack. This
tool will push and create individuals for each PR on the stack.
WARNING. You will NOT be able to merge these commits using the normal UI method, as their branch bases won't be master.
Structure of submitted pull requests
Every commit in your local commit stack gets submitted into a separate pull request and pushes commits onto three branches:
-
gh/username/1/base- think of this like "master": it's the base branch that your commit was based upon. It is never force pushed; whenever you rebase your local stack, we add merge commits on top of base from the true upstream master. -
gh/username/1/head- this branch is your change, on top of the base branch. Like base, it is never force pushed. We open a pull request on this branch, requesting to merge into base. -
gh/username/1/orig- this is the actual commit as per your local copy. GitHub pull requests never sees this commit, but if you want to get a "clean" commit all by itself, this is an easy way to get it.
Developer notes
We have tests, using a mock GitHub GraphQL server! How cool is that?
Run these tests using python test_ghstack.py
Design constraints
There are some weird aspects about GitHub's design which lead to unusual design decisions on this tool.
-
When you create a PR on GitHub, you cannot subsequently change which repository it merges into (you can change which branch merges into). This means you have a hard choice when designing a tool like this: if you want to target the topmost PR to master, you must push branches onto the origin repo; if you give up on this, you can push branches into a fork. We've decided to give up targets to master so that we can push the branches to your fork.
(Actually, this is a lie; we still push to origin lol.)
-
Branch name does not correspond to pull request number. While this would be excellent, we have no way of reserving a pull request number, so we have no idea what it's going to be until we open the pull request, but we can't open the pull request without a branch.
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