From: Johannes Schindelin <johannes.schindelin@xxxxxx>
Currently this function treats unrelated commit histories the same way
as commit histories with missing commit objects.
Typically, missing commit objects constitute a corrupt repository,
though, and should be reported as such. The next commits will make it
so, but there is one exception: In `git fetch --update-shallow` we
_expect_ commit objects to be missing, and we do want to treat the
now-incomplete commit histories as unrelated.
To allow for that, let's introduce an additional parameter that is
passed to `repo_in_merge_bases_many()` to trigger this behavior, and use
it in the two callers in `shallow.c`.
This commit changes behavior slightly: unless called from the
`shallow.c` functions that set the `ignore_missing_commits` bit, any
non-existing tip commit that is passed to `repo_in_merge_bases_many()`
will now result in an error.
Note: When encountering missing commits while traversing the commit
history in search for merge bases, with this commit there won't be a
change in behavior just yet, their children will still be interpreted as
root commits. This bug will get fixed by follow-up commits.
Signed-off-by: Johannes Schindelin <johannes.schindelin@xxxxxx>
---
commit-reach.c | 9 +++++----
commit-reach.h | 3 ++-
remote.c | 2 +-
shallow.c | 5 +++--
t/helper/test-reach.c | 2 +-
5 files changed, 12 insertions(+), 9 deletions(-)
diff --git a/commit-reach.c b/commit-reach.c
index 7ea916f9ebd..5c1b5256598 100644
--- a/commit-reach.c
+++ b/commit-reach.c
@@ -467,7 +467,7 @@ int repo_is_descendant_of(struct repository *r,
other = with_commit->item;
with_commit = with_commit->next;
- if (repo_in_merge_bases_many(r, other, 1, &commit))
+ if (repo_in_merge_bases_many(r, other, 1, &commit, 0))
return 1;
}
return 0;
@@ -478,17 +478,18 @@ int repo_is_descendant_of(struct repository *r,
* Is "commit" an ancestor of one of the "references"?
*/
int repo_in_merge_bases_many(struct repository *r, struct commit *commit,
- int nr_reference, struct commit **reference)
+ int nr_reference, struct commit **reference,
+ int ignore_missing_commits)
{
struct commit_list *bases;
int ret = 0, i;
timestamp_t generation, max_generation = GENERATION_NUMBER_ZERO;
if (repo_parse_commit(r, commit))
- return ret;
+ return ignore_missing_commits ? 0 : -1;
for (i = 0; i < nr_reference; i++) {
if (repo_parse_commit(r, reference[i]))
- return ret;
+ return ignore_missing_commits ? 0 : -1;
generation = commit_graph_generation(reference[i]);
if (generation > max_generation)
diff --git a/commit-reach.h b/commit-reach.h
index 35c4da49481..68f81549a44 100644
--- a/commit-reach.h
+++ b/commit-reach.h
@@ -30,7 +30,8 @@ int repo_in_merge_bases(struct repository *r,
struct commit *reference);
int repo_in_merge_bases_many(struct repository *r,
struct commit *commit,
- int nr_reference, struct commit **reference);
+ int nr_reference, struct commit **reference,
+ int ignore_missing_commits);
/*
* Takes a list of commits and returns a new list where those
diff --git a/remote.c b/remote.c
index abb24822beb..763c80f4a7d 100644
--- a/remote.c
+++ b/remote.c
@@ -2675,7 +2675,7 @@ static int is_reachable_in_reflog(const char *local, const struct ref *remote)
if (MERGE_BASES_BATCH_SIZE < size)
size = MERGE_BASES_BATCH_SIZE;
- if ((ret = repo_in_merge_bases_many(the_repository, commit, size, chunk)))
+ if ((ret = repo_in_merge_bases_many(the_repository, commit, size, chunk, 0)))
break;
}
diff --git a/shallow.c b/shallow.c
index ac728cdd778..dfcc1f86a7f 100644
--- a/shallow.c
+++ b/shallow.c
@@ -797,7 +797,7 @@ static void post_assign_shallow(struct shallow_info *info,
for (j = 0; j < bitmap_nr; j++)
if (bitmap[0][j] &&
/* Step 7, reachability test at commit level */
- !repo_in_merge_bases_many(the_repository, c, ca.nr, ca.commits)) {
+ !repo_in_merge_bases_many(the_repository, c, ca.nr, ca.commits, 1)) {
update_refstatus(ref_status, info->ref->nr, *bitmap);
dst++;
break;
@@ -828,7 +828,8 @@ int delayed_reachability_test(struct shallow_info *si, int c)
si->reachable[c] = repo_in_merge_bases_many(the_repository,
commit,
si->nr_commits,
- si->commits);
+ si->commits,
+ 1);
si->need_reachability_test[c] = 0;
}
return si->reachable[c];
diff --git a/t/helper/test-reach.c b/t/helper/test-reach.c
index 3e173399a00..aa816e168ea 100644
--- a/t/helper/test-reach.c
+++ b/t/helper/test-reach.c
@@ -113,7 +113,7 @@ int cmd__reach(int ac, const char **av)
repo_in_merge_bases(the_repository, A, B));
else if (!strcmp(av[1], "in_merge_bases_many"))
printf("%s(A,X):%d\n", av[1],
- repo_in_merge_bases_many(the_repository, A, X_nr, X_array));
+ repo_in_merge_bases_many(the_repository, A, X_nr, X_array, 0));
else if (!strcmp(av[1], "is_descendant_of"))
printf("%s(A,X):%d\n", av[1], repo_is_descendant_of(r, A, X));
else if (!strcmp(av[1], "get_merge_bases_many")) {
--
gitgitgadget
