commit-reach: pass repository to reachability helpers - #2393
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repo_is_descendant_of() accepts a repository, but its generation-number
fast path drops that context when it calls can_all_from_reach(). That helper
and can_all_from_reach_with_flag() consequently dereference tags and parse
commits with the_repository.
During a submodule merge, the commits being walked belong to the submodule
repository. If a submodule commit already has a commit-graph position,
parsing it against the_repository treats that position as an index into the
commit-graph of the superproject. This creates two failure modes:
- An out-of-range position dies with "invalid commit position.
commit-graph is likely corrupt".
- An in-range position reads an unrelated row and can produce an
incorrect reachability result.
Add a repository argument to both helpers and use it for tag dereferencing
and commit parsing. Pass the supplied repository from
repo_is_descendant_of(), and pass the_repository from callers whose objects
belong to the main repository.
Add submodule merge tests with valid commit-graphs in both repositories. A
small superproject graph covers the out-of-range case, while a larger graph
keeps every submodule position numerically in range and covers the incorrect
reachability case. In both cases, verify that the resulting gitlink points
at the descendant commit.
Assisted-by: GPT-5.6 Sol
Signed-off-by: Guillaume Chauvel <guillaume.chauvel@gmail.com>
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