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refs/files: sort merged worktree and common reflogs

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When iterating through reflogs in a worktree we create a merged iterator
that merges reflogs from both refdbs. The resulting refs are ordered so
that instead we first return all worktree reflogs before we return all
common refs.

This is the only remaining case where a ref iterator returns entries in
a non-lexicographic order. The result would look something like the
following (listed with a command we introduce in a subsequent commit):

```
$ git reflog list
HEAD
refs/worktree/per-worktree
refs/heads/main
refs/heads/wt
```

So we first print the per-worktree reflogs in lexicographic order, then
the common reflogs in lexicographic order. This is confusing and not
consistent with how we print per-worktree refs, which are exclusively
sorted lexicographically.

Sort reflogs lexicographically in the same way as we sort normal refs.
As this is already implemented properly by the "reftable" backend via a
separate selection function, we simply pull out that logic and reuse it
for the "files" backend. As logs are properly sorted now, mark the
merged reflog iterator as sorted.

Tests will be added in a subsequent commit.

Signed-off-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Patrick Steinhardt
2024-02-21 13:37:31 +01:00
committed by Junio C Hamano
parent e69e8ffef7
commit 6f22780017
4 changed files with 56 additions and 73 deletions
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30
refs/files-backend.c
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@ -2210,32 +2210,6 @@ static struct ref_iterator *reflog_iterator_begin(struct ref_store *ref_store,
return ref_iterator;
}
static enum iterator_selection reflog_iterator_select(
struct ref_iterator *iter_worktree,
struct ref_iterator *iter_common,
void *cb_data UNUSED)
{
if (iter_worktree) {
/*
* We're a bit loose here. We probably should ignore
* common refs if they are accidentally added as
* per-worktree refs.
*/
return ITER_SELECT_0;
} else if (iter_common) {
if (parse_worktree_ref(iter_common->refname, NULL, NULL,
NULL) == REF_WORKTREE_SHARED)
return ITER_SELECT_1;
/*
* The main ref store may contain main worktree's
* per-worktree refs, which should be ignored
*/
return ITER_SKIP_1;
} else
return ITER_DONE;
}
static struct ref_iterator *files_reflog_iterator_begin(struct ref_store *ref_store)
{
struct files_ref_store *refs =
@ -2246,9 +2220,9 @@ static struct ref_iterator *files_reflog_iterator_begin(struct ref_store *ref_st
return reflog_iterator_begin(ref_store, refs->gitcommondir);
} else {
return merge_ref_iterator_begin(
0, reflog_iterator_begin(ref_store, refs->base.gitdir),
1, reflog_iterator_begin(ref_store, refs->base.gitdir),
reflog_iterator_begin(ref_store, refs->gitcommondir),
reflog_iterator_select, refs);
ref_iterator_select, refs);
}
}