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fix(dev-infra): incorrect base revision for merge script autosquash (#37138) 

As mentioned in the previous commit, the autosquash strategy has
not been used in the components repo, so we could easily regress.

After thorough manual testing of the autosquash strategy again,
now that the merge script will be moved to framework, it came
to mind that there is a bug with the base revision in the
autosquash merge strategy. The problem is that the base revision
of a given PR is relying on the amount of commits in a PR.

This is prone to error because the amount of commits could easily
change in the autosquash merge strategy, because fixup or squash
commits will be collapsed. Basically invalidating the base revision.

To fix this, we fixate the base revision by determining the actual
SHA. This one is guaranteed to not change after the autosquash rebase.

The current merge script in framework fixates the revision by creating
a separate branch, but there is no benefit in that, compared to just
using an explicit SHA that doesn't need to be cleaned up..

PR Close #37138
This commit is contained in:
Paul Gschwendtner 2020-05-15 16:19:19 +02:00 committed by Kara Erickson
parent e19930e70d
commit c2c14c2a1f
1 changed files with 10 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

14
dev-infra/pr/merge/strategies/autosquash-merge.ts
View File

@ -34,10 +34,16 @@ export class AutosquashMergeStrategy extends MergeStrategy {
return PullRequestFailure.unsatisfiedBaseSha();
}
// SHA for the first commit the pull request is based on. Usually we would able
// to just rely on the base revision provided by `getPullRequestBaseRevision`, but
// the revision would rely on the amount of commits in a pull request. This is not
// reliable as we rebase the PR with autosquash where the amount of commits could
// change. We work around this by parsing the base revision so that we have a fixated
// SHA before the autosquash rebase is performed.
const baseSha =
this.git.run(['rev-parse', this.getPullRequestBaseRevision(pullRequest)]).stdout.trim();
// Git revision range that matches the pull request commits.
const revisionRange = this.getPullRequestRevisionRange(pullRequest);
// Git revision for the first commit the pull request is based on.
const baseRevision = this.getPullRequestBaseRevision(pullRequest);
const revisionRange = `${baseSha}..${TEMP_PR_HEAD_BRANCH}`;
// We always rebase the pull request so that fixup or squash commits are automatically
// collapsed. Git's autosquash functionality does only work in interactive rebases, so
@ -49,7 +55,7 @@ export class AutosquashMergeStrategy extends MergeStrategy {
const rebaseEnv =
needsCommitMessageFixup ? undefined : {...process.env, GIT_SEQUENCE_EDITOR: 'true'};
this.git.run(
['rebase', '--interactive', '--autosquash', baseRevision, TEMP_PR_HEAD_BRANCH],
['rebase', '--interactive', '--autosquash', baseSha, TEMP_PR_HEAD_BRANCH],
{stdio: 'inherit', env: rebaseEnv});
// Update pull requests commits to reference the pull request. This matches what