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commit-graph: avoid repeated mixed generation number warnings 

When validating that a commit-graph has either all zero, or all non-zero
generation numbers, we emit a warning on both the rising and falling
edge of transitioning between the two.

So if we are unfortunate enough to see a commit-graph which has a
repeating sequence of zero, then non-zero generation numbers, we'll
generate many warnings that contain more or less the same information.

Avoid this by keeping track of a single example for a commit with zero-
and non-zero generation, and emit a single warning at the end of
verification if both are non-NULL.

Co-authored-by: Jeff King <peff@peff.net>
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Taylor Blau <me@ttaylorr.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
maint
Taylor Blau 2023-08-21 17:34:42 -04:00 committed by Junio C Hamano
parent ce7629a315
commit db6044d762
2 changed files with 15 additions and 18 deletions
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29
commit-graph.c
View File

@ -2560,9 +2560,6 @@ static void graph_report(const char *fmt, ...)
va_end(ap);
}

#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);
@ -2575,7 +2572,8 @@ static int verify_one_commit_graph(struct repository *r,
{
uint32_t i, cur_fanout_pos = 0;
struct object_id prev_oid, cur_oid;
int generation_zero = 0;
struct commit *seen_gen_zero = NULL;
struct commit *seen_gen_non_zero = NULL;

verify_commit_graph_error = verify_commit_graph_lite(g);
if (verify_commit_graph_error)
@ -2681,19 +2679,12 @@ static int verify_one_commit_graph(struct repository *r,
graph_report(_("commit-graph parent list for commit %s terminates early"),
oid_to_hex(&cur_oid));

if (!commit_graph_generation_from_graph(graph_commit)) {
if (generation_zero == GENERATION_NUMBER_EXISTS)
graph_report(_("commit-graph has generation number zero for commit %s, but non-zero elsewhere"),
oid_to_hex(&cur_oid));
generation_zero = GENERATION_ZERO_EXISTS;
} else {
if (generation_zero == GENERATION_ZERO_EXISTS)
graph_report(_("commit-graph has non-zero generation number for commit %s, but zero elsewhere"),
oid_to_hex(&cur_oid));
generation_zero = GENERATION_NUMBER_EXISTS;
}
if (commit_graph_generation_from_graph(graph_commit))
seen_gen_non_zero = graph_commit;
else
seen_gen_zero = graph_commit;

if (generation_zero == GENERATION_ZERO_EXISTS)
if (seen_gen_zero)
continue;

/*
@ -2719,6 +2710,12 @@ static int verify_one_commit_graph(struct repository *r,
odb_commit->date);
}

if (seen_gen_zero && seen_gen_non_zero)
graph_report(_("commit-graph has both zero and non-zero "
"generations (e.g., commits '%s' and '%s')"),
oid_to_hex(&seen_gen_zero->object.oid),
oid_to_hex(&seen_gen_non_zero->object.oid));

return verify_commit_graph_error;
}


4
t/t5318-commit-graph.sh
View File

@ -620,12 +620,12 @@ test_expect_success 'detect incorrect chunk count' '

test_expect_success 'detect mixed generation numbers (non-zero to zero)' '
corrupt_graph_and_verify $GRAPH_BYTE_COMMIT_GENERATION_LAST "\0\0\0\0" \
"but non-zero elsewhere"
"both zero and non-zero generations"
'

test_expect_success 'detect mixed generation numbers (zero to non-zero)' '
corrupt_graph_and_verify $GRAPH_BYTE_COMMIT_GENERATION "\0\0\0\0" \
"but zero elsewhere"
"both zero and non-zero generations"
'

test_expect_success 'git fsck (checks commit-graph when config set to true)' '