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git: extract a function for abandoning unreachable commits

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This motivation for this is so we can easily skip calling the function
if the user has opted out of the propagation of abandoned commits we
usually do (#2504). However, it seems like a good piece of code to
extract regardless of that feature.
This commit is contained in:
Martin von Zweigbergk 2023-11-04 22:25:50 -07:00 committed by Martin von Zweigbergk
parent d9fbf21794
commit 7bf8906f9c
1 changed files with 13 additions and 13 deletions
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26
lib/src/git.rs
View file

@ -313,18 +313,24 @@ pub fn import_some_refs(
}
}
// Find commits that are no longer referenced in the git repo and abandon them
// in jj as well.
let abandoned_commits = abandon_unreachable_commits(mut_repo, &changed_remote_refs);
let stats = GitImportStats { abandoned_commits };
Ok(stats)
}
/// Finds commits that used to be reachable in git that no longer are reachable.
/// Those commits will be recorded as abandoned in the `MutableRepo`.
fn abandon_unreachable_commits(
mut_repo: &mut MutableRepo,
changed_remote_refs: &BTreeMap<RefName, (RemoteRef, RefTarget)>,
) -> Vec<CommitId> {
let hidable_git_heads = changed_remote_refs
.values()
.flat_map(|(old_remote_ref, _)| old_remote_ref.target.added_ids())
.cloned()
.collect_vec();
if hidable_git_heads.is_empty() {
let stats = GitImportStats {
abandoned_commits: vec![],
};
return Ok(stats);
return vec![];
}
let pinned_heads = itertools::chain!(
changed_remote_refs
@ -335,10 +341,6 @@ pub fn import_some_refs(
)
.cloned()
.collect_vec();
// We could use mut_repo.record_rewrites() here but we know we only need to care
// about abandoned commits for now. We may want to change this if we ever
// add a way of preserving change IDs across rewrites by `git` (e.g. by
// putting them in the commit message).
let abandoned_expression = RevsetExpression::commits(pinned_heads)
.range(&RevsetExpression::commits(hidable_git_heads))
.intersection(&RevsetExpression::visible_heads().ancestors());
@ -352,9 +354,7 @@ pub fn import_some_refs(
for abandoned_commit in &abandoned_commits {
mut_repo.record_abandoned_commit(abandoned_commit.clone());
}
let stats = GitImportStats { abandoned_commits };
Ok(stats)
abandoned_commits
}
/// Calculates diff of git refs to be imported.