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received-spf: None (protection.outlook.com: microsoft.com does not designate permitted sender hosts) x-microsoft-antispam-message-info: 6lb/9GC/+/HMBVq5K5BMhO5ME/2WqhQmeWbF2RMD23lLAU097AFvv0S34dcWPi0MbY3uXcS+yMEzJlRoN1GXeUx1r/IWjZ+jV/mplKtUYB+3nFo9Ji7DevUmvPMbxzOphs++hKTC0Mrn4t912m2q3Yy4/6BEQ8gjsQywUCoACuT4oBjYewJy9/mUXKp0Q7uH spamdiagnosticoutput: 1:99 spamdiagnosticmetadata: NSPM Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-MS-Office365-Filtering-Correlation-Id: 69c845dc-9b25-4f80-2226-08d5cba1c139 X-OriginatorOrg: microsoft.com X-MS-Exchange-CrossTenant-Network-Message-Id: 69c845dc-9b25-4f80-2226-08d5cba1c139 X-MS-Exchange-CrossTenant-originalarrivaltime: 06 Jun 2018 11:36:33.8676 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 72f988bf-86f1-41af-91ab-2d7cd011db47 X-MS-Exchange-Transport-CrossTenantHeadersStamped: BL0PR2101MB1044 Sender: git-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: git@vger.kernel.org While iterating through the commit parents, perform the generation number calculation and compare against the value stored in the commit-graph. The tests demonstrate that having a different set of parents affects the generation number calculation, and this value propagates to descendants. Hence, we drop the single-line condition on the output. Since Git will ship with the commit-graph feature without generation numbers, we need to accept commit-graphs with all generation numbers equal to zero. In this case, ignore the generation number calculation. However, verify that we should never have a mix of zero and non-zero generation numbers. Create a test that sets one commit to generation zero and all following commits report a failure as they have non-zero generation in a file that contains generation number zero. Signed-off-by: Derrick Stolee --- commit-graph.c | 34 ++++++++++++++++++++++++++++++++++ t/t5318-commit-graph.sh | 11 +++++++++++ 2 files changed, 45 insertions(+) diff --git a/commit-graph.c b/commit-graph.c index fcebd0925c..b97fa05ec9 100644 --- a/commit-graph.c +++ b/commit-graph.c @@ -845,10 +845,14 @@ static void graph_report(const char *fmt, ...) va_end(ap); } =20 +#define GENERATION_ZERO_EXISTS 1 +#define GENERATION_NUMBER_EXISTS 2 + int verify_commit_graph(struct commit_graph *g) { uint32_t i, cur_fanout_pos =3D 0; struct object_id prev_oid, cur_oid; + int generation_zero =3D 0; =20 if (!g) { graph_report("no commit-graph file loaded"); @@ -910,6 +914,7 @@ int verify_commit_graph(struct commit_graph *g) for (i =3D 0; i < g->num_commits; i++) { struct commit *graph_commit, *odb_commit; struct commit_list *graph_parents, *odb_parents; + uint32_t max_generation =3D 0; =20 hashcpy(cur_oid.hash, g->chunk_oid_lookup + g->hash_len * i); =20 @@ -944,6 +949,9 @@ int verify_commit_graph(struct commit_graph *g) oid_to_hex(&graph_parents->item->object.oid), oid_to_hex(&odb_parents->item->object.oid)); =20 + if (graph_parents->item->generation > max_generation) + max_generation =3D graph_parents->item->generation; + graph_parents =3D graph_parents->next; odb_parents =3D odb_parents->next; } @@ -951,6 +959,32 @@ int verify_commit_graph(struct commit_graph *g) if (odb_parents !=3D NULL) graph_report("commit-graph parent list for commit %s terminates early", oid_to_hex(&cur_oid)); + + if (!graph_commit->generation) { + if (generation_zero =3D=3D GENERATION_NUMBER_EXISTS) + graph_report("commit-graph has generation number zero for commit %s, b= ut non-zero elsewhere", + oid_to_hex(&cur_oid)); + generation_zero =3D GENERATION_ZERO_EXISTS; + } else if (generation_zero =3D=3D GENERATION_ZERO_EXISTS) + graph_report("commit-graph has non-zero generation number for commit %s= , but zero elsewhere", + oid_to_hex(&cur_oid)); + + if (generation_zero =3D=3D GENERATION_ZERO_EXISTS) + continue; + + /* + * If one of our parents has generation GENERATION_NUMBER_MAX, then + * our generation is also GENERATION_NUMBER_MAX. Decrement to avoid + * extra logic in the following condition. + */ + if (max_generation =3D=3D GENERATION_NUMBER_MAX) + max_generation--; + + if (graph_commit->generation !=3D max_generation + 1) + graph_report("commit-graph generation for commit %s is %u !=3D %u", + oid_to_hex(&cur_oid), + graph_commit->generation, + max_generation + 1); } =20 return verify_commit_graph_error; diff --git a/t/t5318-commit-graph.sh b/t/t5318-commit-graph.sh index ec0964112a..a6ea1341dc 100755 --- a/t/t5318-commit-graph.sh +++ b/t/t5318-commit-graph.sh @@ -272,6 +272,7 @@ GRAPH_BYTE_COMMIT_TREE=3D$GRAPH_COMMIT_DATA_OFFSET GRAPH_BYTE_COMMIT_PARENT=3D$(($GRAPH_COMMIT_DATA_OFFSET + $HASH_LEN)) GRAPH_BYTE_COMMIT_EXTRA_PARENT=3D$(($GRAPH_COMMIT_DATA_OFFSET + $HASH_LEN = + 4)) GRAPH_BYTE_COMMIT_WRONG_PARENT=3D$(($GRAPH_COMMIT_DATA_OFFSET + $HASH_LEN = + 3)) +GRAPH_BYTE_COMMIT_GENERATION=3D$(($GRAPH_COMMIT_DATA_OFFSET + $HASH_LEN + = 11)) =20 # usage: corrupt_graph_and_verify # Manipulates the commit-graph file at the position @@ -366,4 +367,14 @@ test_expect_success 'detect wrong parent' ' "commit-graph parent for" ' =20 +test_expect_success 'detect incorrect generation number' ' + corrupt_graph_and_verify $GRAPH_BYTE_COMMIT_GENERATION "\070" \ + "generation for commit" +' + +test_expect_success 'detect incorrect generation number' ' + corrupt_graph_and_verify $GRAPH_BYTE_COMMIT_GENERATION "\01" \ + "non-zero generation number" +' + test_done --=20 2.18.0.rc1