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commit-reach(repo_in_merge_bases_many): optionally expect missing com…
…mits 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@gmx.de> Signed-off-by: Junio C Hamano <gitster@pobox.com>
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