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Include wlroots checkout helper for bisecting #8347

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Include wlroots checkout helper for bisecting #8347

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26 changes: 26 additions & 0 deletions CONTRIBUTING.md
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Expand Up @@ -243,3 +243,29 @@ error_session:
return NULL;
}
```

## Bisecting

When bisecting, it is often necessary to build older commits with their
contemporary version of wlroots:

```python
#!/usr/bin/env python3
#
# Check out the wlroots commit that was the current master at the time that the current
# sway HEAD was committed. Requires pygit2. E.g.: apk add py3-pygit2

import pygit2

sway = pygit2.Repository(".")
head = sway.revparse_single("HEAD")
sway_time = head.commit_time

wlroots = pygit2.Repository("subprojects/wlroots")
master = wlroots.revparse_single("master")
for commit in wlroots.walk(master.id, pygit2.enums.SortMode.TIME):
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I'm not sure if using the time is always the right thing here, have you encountered any issue with that so far?

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I'm not sure if using the time is always the right thing here

In this context, TIME is the commit time specifically, which is the time when the commit was merged into the master branch.

The time shown by git log is the author time. Using that one does not work; it yields bogus results since some commits are authored months before being merged.

have you encountered any issue with that so far?

When wlroots version N is released, the version is immediately bumped to N+1. From that point on, meson will complain that it has wlroots N+1 but expects version N.

In my experience bisecting sway, very few commits have this issue. Usually I skip these. If you need to dive into that range, you'll can just check out the wlroots tag.

if commit.commit_time < sway_time:
break

wlroots.checkout_tree(commit)
```