In the commit-graph file, the OID fanout chunk provides an index into
the OID lookup. The 'verify' subcommand should find incorrect values
in the fanout.
Similarly, the 'verify' subcommand should find out-of-order values in
the OID lookup.
Signed-off-by: Derrick Stolee <dsto...@microsoft.com>
---
commit-graph.c | 36 ++++++++++++++++++++++++++++++++++++
t/t5318-commit-graph.sh | 22 ++++++++++++++++++++++
2 files changed, 58 insertions(+)
diff --git a/commit-graph.c b/commit-graph.c
index 25d5edea82..a90cc2e6f4 100644
--- a/commit-graph.c
+++ b/commit-graph.c
@@ -840,6 +840,9 @@ static void graph_report(const char *fmt, ...)
int verify_commit_graph(struct commit_graph *g)
{
+ uint32_t i, cur_fanout_pos = 0;
+ struct object_id prev_oid, cur_oid;
+
if (!g) {
graph_report("no commit-graph file loaded");
return 1;
@@ -854,5 +857,38 @@ int verify_commit_graph(struct commit_graph *g)
if (!g->chunk_commit_data)
graph_report("commit-graph is missing the Commit Data chunk");
+ if (verify_commit_graph_error)
+ return verify_commit_graph_error;
+
+ for (i = 0; i < g->num_commits; i++) {
+ hashcpy(cur_oid.hash, g->chunk_oid_lookup + g->hash_len * i);
+
+ if (i && oidcmp(&prev_oid, &cur_oid) >= 0)
+ graph_report("commit-graph has incorrect OID order: %s
then %s",
+ oid_to_hex(&prev_oid),
+ oid_to_hex(&cur_oid));
+
+ oidcpy(&prev_oid, &cur_oid);
+
+ while (cur_oid.hash[0] > cur_fanout_pos) {
+ uint32_t fanout_value = get_be32(g->chunk_oid_fanout +
cur_fanout_pos);
+ if (i != fanout_value)
+ graph_report("commit-graph has incorrect fanout
value: fanout[%d] = %u != %u",
+ cur_fanout_pos, fanout_value, i);
+
+ cur_fanout_pos++;
+ }
+ }
+
+ while (cur_fanout_pos < 256) {
+ uint32_t fanout_value = get_be32(g->chunk_oid_fanout +
cur_fanout_pos);
+
+ if (g->num_commits != fanout_value)
+ graph_report("commit-graph has incorrect fanout value:
fanout[%d] = %u != %u",
+ cur_fanout_pos, fanout_value, i);
+
+ cur_fanout_pos++;
+ }
+
return verify_commit_graph_error;
}
diff --git a/t/t5318-commit-graph.sh b/t/t5318-commit-graph.sh
index 846396665e..c29eae47c9 100755
--- a/t/t5318-commit-graph.sh
+++ b/t/t5318-commit-graph.sh
@@ -247,6 +247,7 @@ test_expect_success 'git commit-graph verify' '
git commit-graph verify >output
'
+HASH_LEN=20
GRAPH_BYTE_VERSION=4
GRAPH_BYTE_HASH=5
GRAPH_BYTE_CHUNK_COUNT=6
@@ -258,6 +259,12 @@ GRAPH_BYTE_OID_LOOKUP_ID=$(($GRAPH_CHUNK_LOOKUP_OFFSET + \
1 \* $GRAPH_CHUNK_LOOKUP_WIDTH))
GRAPH_BYTE_COMMIT_DATA_ID=$(($GRAPH_CHUNK_LOOKUP_OFFSET + \
2 \* $GRAPH_CHUNK_LOOKUP_WIDTH))
+GRAPH_FANOUT_OFFSET=$(($GRAPH_CHUNK_LOOKUP_OFFSET + \
+ $GRAPH_CHUNK_LOOKUP_WIDTH \* $GRAPH_CHUNK_LOOKUP_ROWS))
+GRAPH_BYTE_FANOUT1=$(($GRAPH_FANOUT_OFFSET + 4 \* 4))
+GRAPH_BYTE_FANOUT2=$(($GRAPH_FANOUT_OFFSET + 4 \* 255))
+GRAPH_OID_LOOKUP_OFFSET=$(($GRAPH_FANOUT_OFFSET + 4 \* 256))
+GRAPH_BYTE_OID_LOOKUP_ORDER=$(($GRAPH_OID_LOOKUP_OFFSET + $HASH_LEN \* 8))
# usage: corrupt_graph_and_verify <position> <data> <string>
# Manipulates the commit-graph file at the position
@@ -312,4 +319,19 @@ test_expect_success 'detect missing commit data chunk' '
"missing the Commit Data chunk"
'
+test_expect_success 'detect incorrect fanout' '
+ corrupt_graph_and_verify $GRAPH_BYTE_FANOUT1 "\01" \
+ "fanout value"
+'
+
+test_expect_success 'detect incorrect fanout final value' '
+ corrupt_graph_and_verify $GRAPH_BYTE_FANOUT2 "\01" \
+ "fanout value"
+'
+
+test_expect_success 'detect incorrect OID order' '
+ corrupt_graph_and_verify $GRAPH_BYTE_OID_LOOKUP_ORDER "\01" \
+ "incorrect OID order"
+'
+
test_done
--
2.18.0.rc1
