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commit-graph: rewrite to use checksum_valid()

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Rewrite an existing caller in `git commit-graph verify` to take
advantage of checksum_valid().

Note that the replacement isn't a verbatim cut-and-paste, since the new
function avoids using hashfile at all and instead talks to the_hash_algo
directly, but it is functionally equivalent.

Signed-off-by: Taylor Blau <me@ttaylorr.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Taylor Blau 2021-06-23 14:39:09 -04:00 committed by Junio C Hamano
parent f9221e2cf5
commit 15316a4732
1 changed files with 6 additions and 8 deletions
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14
commit-graph.c
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@ -2422,14 +2422,16 @@ static void graph_report(const char *fmt, ...)
#define GENERATION_ZERO_EXISTS 1
#define GENERATION_NUMBER_EXISTS 2
static int commit_graph_checksum_valid(struct commit_graph *g)
{
return hashfile_checksum_valid(g->data, g->data_len);
}
int verify_commit_graph(struct repository *r, struct commit_graph *g, int flags)
{
uint32_t i, cur_fanout_pos = 0;
struct object_id prev_oid, cur_oid;
unsigned char checksum[GIT_MAX_HEXSZ];
int generation_zero = 0;
struct hashfile *f;
int devnull;
struct progress *progress = NULL;
int local_error = 0;
@ -2442,11 +2444,7 @@ int verify_commit_graph(struct repository *r, struct commit_graph *g, int flags)
if (verify_commit_graph_error)
return verify_commit_graph_error;
devnull = open("/dev/null", O_WRONLY);
f = hashfd(devnull, NULL);
hashwrite(f, g->data, g->data_len - g->hash_len);
finalize_hashfile(f, checksum, CSUM_CLOSE);
if (!hasheq(checksum, g->data + g->data_len - g->hash_len)) {
if (!commit_graph_checksum_valid(g)) {
graph_report(_("the commit-graph file has incorrect checksum and is likely corrupt"));
verify_commit_graph_error = VERIFY_COMMIT_GRAPH_ERROR_HASH;
}