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fsck: verify commit-graph

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If core.commitGraph is true, verify the contents of the commit-graph
during 'git fsck' using the 'git commit-graph verify' subcommand. Run
this check on all alternates, as well.

We use a new process for two reasons:

1. The subcommand decouples the details of loading and verifying a
   commit-graph file from the other fsck details.

2. The commit-graph verification requires the commits to be loaded
   in a specific order to guarantee we parse from the commit-graph
   file for some objects and from the object database for others.

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 09:24:43 -04:00 committed by Junio C Hamano
parent 41df0e307f
commit e0fd51e1d7
3 changed files with 32 additions and 0 deletions
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3
Documentation/git-fsck.txt
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@ -110,6 +110,9 @@ Any corrupt objects you will have to find in backups or other archives
(i.e., you can just remove them and do an 'rsync' with some other site in
the hopes that somebody else has the object you have corrupted).
If core.commitGraph is true, the commit-graph file will also be inspected
using 'git commit-graph verify'. See linkgit:git-commit-graph[1].
Extracted Diagnostics
---------------------

21
builtin/fsck.c
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@ -18,6 +18,7 @@
#include "decorate.h"
#include "packfile.h"
#include "object-store.h"
#include "run-command.h"
#define REACHABLE 0x0001
#define SEEN 0x0002
@ -47,6 +48,7 @@ static int name_objects;
#define ERROR_REACHABLE 02
#define ERROR_PACK 04
#define ERROR_REFS 010
#define ERROR_COMMIT_GRAPH 020
static const char *describe_object(struct object *obj)
{
@ -822,5 +824,24 @@ int cmd_fsck(int argc, const char **argv, const char *prefix)
}
check_connectivity();
if (core_commit_graph) {
struct child_process commit_graph_verify = CHILD_PROCESS_INIT;
const char *verify_argv[] = { "commit-graph", "verify", NULL, NULL, NULL };
commit_graph_verify.argv = verify_argv;
commit_graph_verify.git_cmd = 1;
if (run_command(&commit_graph_verify))
errors_found |= ERROR_COMMIT_GRAPH;
prepare_alt_odb(the_repository);
for (alt = the_repository->objects->alt_odb_list; alt; alt = alt->next) {
verify_argv[2] = "--object-dir";
verify_argv[3] = alt->path;
if (run_command(&commit_graph_verify))
errors_found |= ERROR_COMMIT_GRAPH;
}
}
return errors_found;
}

8
t/t5318-commit-graph.sh
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@ -399,4 +399,12 @@ test_expect_success 'detect invalid checksum hash' '
"incorrect checksum"
'
test_expect_success 'git fsck (checks commit-graph)' '
cd "$TRASH_DIRECTORY/full" &&
git fsck &&
corrupt_graph_and_verify $GRAPH_BYTE_FOOTER "\00" \
"incorrect checksum" &&
test_must_fail git fsck
'
test_done