| commit | 4d4e49fff17122e0eec185857fa87d526174859f | [log] [tgz] |
|---|---|---|
| author | Jonathan Tan <jonathantanmy@google.com> | Mon Jun 06 10:54:37 2022 -0700 |
| committer | Junio C Hamano <gitster@pobox.com> | Mon Jun 06 11:50:34 2022 -0700 |
| tree | 987539eb1a4cd50d6321b409e75779c61db130ee | |
| parent | 2668e3608e47494f2f10ef2b6e69f08a84816bcb [diff] |
commit,shallow: unparse commits if grafts changed When a commit is parsed, it pretends to have a different (possibly empty) list of parents if there is graft information for that commit. But there is a bug that could occur when a commit is parsed, the graft information is updated (for example, when a shallow file is rewritten), and the same commit is subsequently used: the parents of the commit do not conform to the updated graft information, but the information at the time of parsing. This is usually not an issue, as a commit is usually introduced into the repository at the same time as its graft information. That means that when we try to parse that commit, we already have its graft information. But it is an issue when fetching a shallow point directly into a repository with submodules. The function assign_shallow_commits_to_refs() parses all sought objects (including the shallow point, which we are directly fetching). In update_shallow() in fetch-pack.c, assign_shallow_commits_to_refs() is called before commit_shallow_file(), which means that the shallow point would have been parsed before graft information is updated. Once a commit is parsed, it is no longer sensitive to any graft information updates. This parsed commit is subsequently used when we do a revision walk to search for submodules to fetch, meaning that the commit is considered to have parents even though it is a shallow point (and therefore should be treated as having no parents). Therefore, whenever graft information is updated, mark the commits that were previously grafts and the commits that are newly grafts as unparsed. Signed-off-by: Jonathan Tan <jonathantanmy@google.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
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