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received-spf: None (protection.outlook.com: microsoft.com does not designate permitted sender hosts) x-microsoft-antispam-message-info: vO3NevLCVO/RupI+u5/lOkyt8u7dDT68BioO6wznWA/SlN4nV0FVzy2/ZOrVvW5r5iUtLdmcqvrG/PLoU5VplmIfLNuyh537I53c1O683ghbbIkzyiKH+emyxGSySKe/wtejqTDa27YnHHQYuUIB08Sn0xp3yQvgWXBm4Mz8pZ+idA4fE41kPHDCZ9VBWCYu 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: 1331736f-3c41-4e8d-032b-08d5c192fb82 X-OriginatorOrg: microsoft.com X-MS-Exchange-CrossTenant-Network-Message-Id: 1331736f-3c41-4e8d-032b-08d5c192fb82 X-MS-Exchange-CrossTenant-originalarrivaltime: 24 May 2018 16:25:37.9636 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 72f988bf-86f1-41af-91ab-2d7cd011db47 X-MS-Exchange-Transport-CrossTenantHeadersStamped: BL0PR2101MB0882 Sender: git-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: git@vger.kernel.org If the commit-graph file becomes corrupt, we need a way to verify that its contents match the object database. In the manner of 'git fsck' we will implement a 'git commit-graph verify' subcommand to report all issues with the file. Add the 'verify' subcommand to the 'commit-graph' builtin and its documentation. The subcommand is currently a no-op except for loading the commit-graph into memory, which may trigger run-time errors that would be caught by normal use. Add a simple test that ensures the command returns a zero error code. If no commit-graph file exists, this is an acceptable state. Do not report any errors. Signed-off-by: Derrick Stolee --- Documentation/git-commit-graph.txt | 6 ++++++ builtin/commit-graph.c | 38 ++++++++++++++++++++++++++++++++++= ++++ commit-graph.c | 26 ++++++++++++++++++++++++++ commit-graph.h | 2 ++ t/t5318-commit-graph.sh | 10 ++++++++++ 5 files changed, 82 insertions(+) diff --git a/Documentation/git-commit-graph.txt b/Documentation/git-commit-= graph.txt index 4c97b555cc..a222cfab08 100644 --- a/Documentation/git-commit-graph.txt +++ b/Documentation/git-commit-graph.txt @@ -10,6 +10,7 @@ SYNOPSIS -------- [verse] 'git commit-graph read' [--object-dir ] +'git commit-graph verify' [--object-dir ] 'git commit-graph write' [--object-dir ] =20 =20 @@ -52,6 +53,11 @@ existing commit-graph file. Read a graph file given by the commit-graph file and output basic details about the graph file. Used for debugging purposes. =20 +'verify':: + +Read the commit-graph file and verify its contents against the object +database. Used to check for corrupted data. + =20 EXAMPLES -------- diff --git a/builtin/commit-graph.c b/builtin/commit-graph.c index f0875b8bf3..0433dd6e20 100644 --- a/builtin/commit-graph.c +++ b/builtin/commit-graph.c @@ -8,10 +8,16 @@ static char const * const builtin_commit_graph_usage[] =3D { N_("git commit-graph [--object-dir ]"), N_("git commit-graph read [--object-dir ]"), + N_("git commit-graph verify [--object-dir ]"), N_("git commit-graph write [--object-dir ] [--append] [--stdin-pa= cks|--stdin-commits]"), NULL }; =20 +static const char * const builtin_commit_graph_verify_usage[] =3D { + N_("git commit-graph verify [--object-dir ]"), + NULL +}; + static const char * const builtin_commit_graph_read_usage[] =3D { N_("git commit-graph read [--object-dir ]"), NULL @@ -29,6 +35,36 @@ static struct opts_commit_graph { int append; } opts; =20 + +static int graph_verify(int argc, const char **argv) +{ + struct commit_graph *graph =3D 0; + char *graph_name; + + static struct option builtin_commit_graph_verify_options[] =3D { + OPT_STRING(0, "object-dir", &opts.obj_dir, + N_("dir"), + N_("The object directory to store the graph")), + OPT_END(), + }; + + argc =3D parse_options(argc, argv, NULL, + builtin_commit_graph_verify_options, + builtin_commit_graph_verify_usage, 0); + + if (!opts.obj_dir) + opts.obj_dir =3D get_object_directory(); + + graph_name =3D get_commit_graph_filename(opts.obj_dir); + graph =3D load_commit_graph_one(graph_name); + FREE_AND_NULL(graph_name); + + if (!graph) + return 0; + + return verify_commit_graph(graph); +} + static int graph_read(int argc, const char **argv) { struct commit_graph *graph =3D NULL; @@ -163,6 +199,8 @@ int cmd_commit_graph(int argc, const char **argv, const= char *prefix) PARSE_OPT_STOP_AT_NON_OPTION); =20 if (argc > 0) { + if (!strcmp(argv[0], "verify")) + return graph_verify(argc, argv); if (!strcmp(argv[0], "read")) return graph_read(argc, argv); if (!strcmp(argv[0], "write")) diff --git a/commit-graph.c b/commit-graph.c index 25893ec096..55b41664ee 100644 --- a/commit-graph.c +++ b/commit-graph.c @@ -836,3 +836,29 @@ void write_commit_graph(const char *obj_dir, oids.alloc =3D 0; oids.nr =3D 0; } + +static int verify_commit_graph_error; + +static void graph_report(const char *fmt, ...) +{ + va_list ap; + struct strbuf sb =3D STRBUF_INIT; + verify_commit_graph_error =3D 1; + + va_start(ap, fmt); + strbuf_vaddf(&sb, fmt, ap); + + fprintf(stderr, "%s\n", sb.buf); + strbuf_release(&sb); + va_end(ap); +} + +int verify_commit_graph(struct commit_graph *g) +{ + if (!g) { + graph_report("no commit-graph file loaded"); + return 1; + } + + return verify_commit_graph_error; +} diff --git a/commit-graph.h b/commit-graph.h index 96cccb10f3..71a39c5a57 100644 --- a/commit-graph.h +++ b/commit-graph.h @@ -53,4 +53,6 @@ void write_commit_graph(const char *obj_dir, int nr_commits, int append); =20 +int verify_commit_graph(struct commit_graph *g); + #endif diff --git a/t/t5318-commit-graph.sh b/t/t5318-commit-graph.sh index 77d85aefe7..6ca451dfd2 100755 --- a/t/t5318-commit-graph.sh +++ b/t/t5318-commit-graph.sh @@ -11,6 +11,11 @@ test_expect_success 'setup full repo' ' objdir=3D".git/objects" ' =20 +test_expect_success 'verify graph with no graph file' ' + cd "$TRASH_DIRECTORY/full" && + git commit-graph verify +' + test_expect_success 'write graph with no packs' ' cd "$TRASH_DIRECTORY/full" && git commit-graph write --object-dir . && @@ -230,4 +235,9 @@ test_expect_success 'perform fast-forward merge in full= repo' ' test_cmp expect output ' =20 +test_expect_success 'git commit-graph verify' ' + cd "$TRASH_DIRECTORY/full" && + git commit-graph verify >output +' + test_done --=20 2.16.2.329.gfb62395de6