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commit: refactor verify_commit_buffer()

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In a following commit, we are going to check commit signatures, but we
won't have a commit yet, only a commit buffer, and we are going to
discard this commit buffer if the signature is invalid. So it would be
wasteful to create a commit that we might discard, just to be able to
check a commit signature.

It would be simpler instead to be able to check commit signatures
using only a commit buffer instead of a commit.

To be able to do that, let's extract some code from the
check_commit_signature() function into a new verify_commit_buffer()
function, and then let's make check_commit_signature() call
verify_commit_buffer().

Note that this doesn't fundamentally change how
check_commit_signature() works. It used to call parse_signed_commit()
which calls repo_get_commit_buffer(), parse_buffer_signed_by_header()
and repo_unuse_commit_buffer(). Now these 3 functions are called
directly by verify_commit_buffer().

Signed-off-by: Christian Couder <chriscool@tuxfamily.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Christian Couder
2025-11-17 05:34:49 +01:00
committed by Junio C Hamano
parent 388517c14c
commit cb034c020a
2 changed files with 22 additions and 2 deletions
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7
commit.h
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@@ -333,6 +333,13 @@ int remove_signature(struct strbuf *buf);
*/
int check_commit_signature(const struct commit *commit, struct signature_check *sigc);
/*
* Same as check_commit_signature() but accepts a commit buffer and
* its size, instead of a `struct commit *`.
*/
int verify_commit_buffer(const char *buffer, size_t size,
struct signature_check *sigc);
/* record author-date for each commit object */
struct author_date_slab;
void record_author_date(struct author_date_slab *author_date,