On Thu, Jan 19, 2017 at 11:12:03AM -0700, Jack Bates wrote:
> I have a couple questions around grepping among open pull requests.
>
> First, "git for-each-ref --no-merged": When I run the following,
> it lists refs/pull/1112/head, even though #1112 was merged in commit
> ced4da1. I guess this is because the tip of refs/pull/1112/head is 107fc59,
> not ced4da1?
Right. Git's `--no-merged` is about commit ancestry.
> This maybe shows my lack of familiarity with Git details,
> but superficially the two commits appear identical -- [1] and [2] --
> same parent, etc. Nonetheless they have different SHA-1s.
> I'm not sure why that is -- I didn't merge the commit --
> but regardless, GitHub somehow still connects ced4da1 with #1112.
The commits differ only in the committer timestamp. Try:
diff -u <(git cat-file commit 107fc5910) \
<(git cat-file commit ced4da132)
Is it possible that somebody cherry-pick or rebased it? Looking at the
history of apache/trafficserver, I don't see any merges, which implies
to me that the project is using a rebase workflow to merge PRs.
It's much trickier to find from the git topology whether a particular
history contains rebased versions of commits. You can look at the
--cherry options to "git log", which use patch-ids to try to equate
commits. Something like:
git for-each-ref --format='%(refname)' 'refs/pull/*/head' |
while read refname; do
if test -z "$(git rev-list --right-only --cherry-pick -1 origin...$refname)
then
echo "$refname: not merged"
fi
done
That's obviously much less efficient than `--no-merged`, but it should
generally work. The exception is if the rebase changed the commit
sufficiently that its patch-id may have changed.
> So my question is, how are they doing that,
I suspect the answer is "somebody clicked the rebase button GitHub"
which simultaneously did the rebase and marked the PR as merged.
> Lastly, a question more about GitHub than Git, but: Given the way GitHub is
> setup, I hope I can get a list of unmerged pull requests from Git alone. Can
> you think of a way to list *open* pull requests,
> or is that status only available out of band?
That information isn't reflected in the git topology. It's in GitHub's
database. You can ask the API:
https://developer.github.com/v3/
There are libraries to help with that:
https://developer.github.com/libraries/
I think that's probably the best answer to your "unmerged" question,
too. Ask the API which PRs are unmerged, and then do whatever git-level
analysis you want based on that.
-Peff