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commit-graph: verify required chunks are present

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The commit-graph file requires the following three chunks:

* OID Fanout
* OID Lookup
* Commit Data

If any of these are missing, then the 'verify' subcommand should
report a failure. This includes the chunk IDs malformed or the
chunk count is truncated.

Signed-off-by: Derrick Stolee <dstolee@microsoft.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Derrick Stolee 2018-06-27 09:24:34 -04:00 committed by Junio C Hamano
parent d9b9f8a6fd
commit 2bd0365f37
2 changed files with 38 additions and 0 deletions
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9
commit-graph.c
View File

@ -848,5 +848,14 @@ int verify_commit_graph(struct repository *r, struct commit_graph *g)
return 1;
}
verify_commit_graph_error = 0;
if (!g->chunk_oid_fanout)
graph_report("commit-graph is missing the OID Fanout chunk");
if (!g->chunk_oid_lookup)
graph_report("commit-graph is missing the OID Lookup chunk");
if (!g->chunk_commit_data)
graph_report("commit-graph is missing the Commit Data chunk");
return verify_commit_graph_error;
}

29
t/t5318-commit-graph.sh
View File

@ -249,6 +249,15 @@ test_expect_success 'git commit-graph verify' '
GRAPH_BYTE_VERSION=4
GRAPH_BYTE_HASH=5
GRAPH_BYTE_CHUNK_COUNT=6
GRAPH_CHUNK_LOOKUP_OFFSET=8
GRAPH_CHUNK_LOOKUP_WIDTH=12
GRAPH_CHUNK_LOOKUP_ROWS=5
GRAPH_BYTE_OID_FANOUT_ID=$GRAPH_CHUNK_LOOKUP_OFFSET
GRAPH_BYTE_OID_LOOKUP_ID=$(($GRAPH_CHUNK_LOOKUP_OFFSET + \
1 * $GRAPH_CHUNK_LOOKUP_WIDTH))
GRAPH_BYTE_COMMIT_DATA_ID=$(($GRAPH_CHUNK_LOOKUP_OFFSET + \
2 * $GRAPH_CHUNK_LOOKUP_WIDTH))
# usage: corrupt_graph_and_verify <position> <data> <string>
# Manipulates the commit-graph file at the position
@ -283,4 +292,24 @@ test_expect_success 'detect bad hash version' '
"hash version"
'
test_expect_success 'detect low chunk count' '
corrupt_graph_and_verify $GRAPH_BYTE_CHUNK_COUNT "\02" \
"missing the .* chunk"
'
test_expect_success 'detect missing OID fanout chunk' '
corrupt_graph_and_verify $GRAPH_BYTE_OID_FANOUT_ID "\0" \
"missing the OID Fanout chunk"
'
test_expect_success 'detect missing OID lookup chunk' '
corrupt_graph_and_verify $GRAPH_BYTE_OID_LOOKUP_ID "\0" \
"missing the OID Lookup chunk"
'
test_expect_success 'detect missing commit data chunk' '
corrupt_graph_and_verify $GRAPH_BYTE_COMMIT_DATA_ID "\0" \
"missing the Commit Data chunk"
'
test_done