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midx: fix *.rev cleanups with --object-dir

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If using --object-dir to point into an object directory which belongs to
a different repository than the one in the current working directory,
such as:

  git init repo
  git -C repo ... # add some objects
  cd alternate
  git multi-pack-index --object-dir ../repo/.git/objects write

the binary will segfault trying to access the object-dir via the repo it
found, but that's not fully initialized. Worse, if we later call
clear_midx_files_ext(), we will use `the_repository` and remove files
out of the wrong object directory.

Fix this by using the given object_dir (or the object directory of
`the_repository` if `--object-dir` wasn't given) to properly to clean up
the *.rev files, avoiding the crash.

Original-patch-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: Taylor Blau <me@ttaylorr.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Taylor Blau 2021-08-31 16:51:55 -04:00 committed by Junio C Hamano
parent 73ff4ad086
commit 426c00e454
2 changed files with 33 additions and 5 deletions
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10
midx.c
View file

@ -882,7 +882,7 @@ static void write_midx_reverse_index(char *midx_name, unsigned char *midx_hash,
strbuf_release(&buf);
}
static void clear_midx_files_ext(struct repository *r, const char *ext,
static void clear_midx_files_ext(const char *object_dir, const char *ext,
unsigned char *keep_hash);
static int midx_checksum_valid(struct multi_pack_index *m)
@ -1086,7 +1086,7 @@ static int write_midx_internal(const char *object_dir, struct multi_pack_index *
if (flags & MIDX_WRITE_REV_INDEX)
write_midx_reverse_index(midx_name, midx_hash, &ctx);
clear_midx_files_ext(the_repository, ".rev", midx_hash);
clear_midx_files_ext(object_dir, ".rev", midx_hash);
commit_lock_file(&lk);
@ -1135,7 +1135,7 @@ static void clear_midx_file_ext(const char *full_path, size_t full_path_len,
die_errno(_("failed to remove %s"), full_path);
}
static void clear_midx_files_ext(struct repository *r, const char *ext,
static void clear_midx_files_ext(const char *object_dir, const char *ext,
unsigned char *keep_hash)
{
struct clear_midx_data data;
@ -1146,7 +1146,7 @@ static void clear_midx_files_ext(struct repository *r, const char *ext,
hash_to_hex(keep_hash), ext);
data.ext = ext;
for_each_file_in_pack_dir(r->objects->odb->path,
for_each_file_in_pack_dir(object_dir,
clear_midx_file_ext,
&data);
@ -1165,7 +1165,7 @@ void clear_midx_file(struct repository *r)
if (remove_path(midx))
die(_("failed to clear multi-pack-index at %s"), midx);
clear_midx_files_ext(r, ".rev", NULL);
clear_midx_files_ext(r->objects->odb->path, ".rev", NULL);
free(midx);
}

28
t/t5319-multi-pack-index.sh
View file

@ -201,6 +201,34 @@ test_expect_success 'write midx with twelve packs' '
compare_results_with_midx "twelve packs"
test_expect_success 'multi-pack-index *.rev cleanup with --object-dir' '
git init repo &&
git clone -s repo alternate &&
test_when_finished "rm -rf repo alternate" &&
(
cd repo &&
test_commit base &&
git repack -d
) &&
ours="alternate/.git/objects/pack/multi-pack-index-123.rev" &&
theirs="repo/.git/objects/pack/multi-pack-index-abc.rev" &&
touch "$ours" "$theirs" &&
(
cd alternate &&
git multi-pack-index --object-dir ../repo/.git/objects write
) &&
# writing a midx in "repo" should not remove the .rev file in the
# alternate
test_path_is_file repo/.git/objects/pack/multi-pack-index &&
test_path_is_file $ours &&
test_path_is_missing $theirs
'
test_expect_success 'warn on improper hash version' '
git init --object-format=sha1 sha1 &&
(