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cache-tree: refactor verification to return error codes

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The function `cache_tree_verify()` will `BUG()` whenever it finds that
the cache-tree extension of the index is corrupt. The function is thus
inherently untestable because the resulting call to `abort()` will be
detected by our testing framework and labelled an error. And rightfully
so: it shouldn't ever be possible to hit bugs, as they should indicate a
programming error rather than corruption of on-disk state.

Refactor the function to instead return error codes. This also ensures
that the function can be used e.g. by git-fsck(1) without the whole
process dying. Furthermore, this refactoring plugs some memory leaks
when returning early by creating a common exit path.

Signed-off-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Patrick Steinhardt
2024-10-07 06:38:15 +02:00
committed by Junio C Hamano
parent 3969d78396
commit 9f119599a6
4 changed files with 79 additions and 35 deletions
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2
cache-tree.h
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@ -33,7 +33,7 @@ struct cache_tree *cache_tree_read(const char *buffer, unsigned long size);
int cache_tree_fully_valid(struct cache_tree *);
int cache_tree_update(struct index_state *, int);
void cache_tree_verify(struct repository *, struct index_state *);
int cache_tree_verify(struct repository *, struct index_state *);
/* bitmasks to write_index_as_tree flags */
#define WRITE_TREE_MISSING_OK 1