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author | Derrick Stolee <stolee@gmail.com> | 2024-05-08 00:05:49 +0000 |
---|---|---|
committer | Junio C Hamano <gitster@pobox.com> | 2024-05-07 17:51:12 -0700 |
commit | b64b0df9dac14d8a9b498a6ecf899046eddf53ab (patch) | |
tree | 1c03471b527124798576402a956818e849aece58 | |
parent | 786a3e4b8d754d2b14b1208b98eeb0a554ef19a8 (diff) | |
download | git-b64b0df9dac14d8a9b498a6ecf899046eddf53ab.tar.gz |
scalar: avoid segfault in reconfigure --all
During the latest v2.45.0 update, 'scalar reconfigure --all' started to
segfault on my machine. Breaking it down via the debugger, it was
faulting on a NULL reference to the_hash_algo, which is a macro pointing
to the_repository->hash_algo.
In my case, this is due to one of my repositories having a detached HEAD,
which requires get_oid_hex() to parse that the HEAD reference is valid.
Another way to cause a failure is to use the "includeIf.onbranch" config
key, which will lead to a BUG() statement.
My first inclination was to try to refactor cmd_reconfigure() to execute
'git for-each-repo' instead of this loop. In addition to the difficulty
of executing 'scalar reconfigure' within 'git for-each-repo', it would
be difficult to perform the clean-up logic for non-existent repos if we
relied on that child process.
Instead, I chose to move the temporary repo to be within the loop and
reinstate the_repository to its old value after we are done performing
logic on the current array item.
Add tests to t9210-scalar.sh to test 'scalar reconfigure --all' with
multiple registered repos. There are two different ways that the old
use of the_repository could trigger bugs. These issues are being solved
independently to be more careful about the_repository being
uninitialized, but the change in this patch around the use of
the_repository is still a good safety precaution.
Co-authored-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Derrick Stolee <stolee@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
-rw-r--r-- | scalar.c | 10 | ||||
-rwxr-xr-x | t/t9210-scalar.sh | 38 |
2 files changed, 45 insertions, 3 deletions
@@ -645,7 +645,6 @@ static int cmd_reconfigure(int argc, const char **argv) }; struct string_list scalar_repos = STRING_LIST_INIT_DUP; int i, res = 0; - struct repository r = { NULL }; struct strbuf commondir = STRBUF_INIT, gitdir = STRBUF_INIT; argc = parse_options(argc, argv, NULL, options, @@ -665,6 +664,7 @@ static int cmd_reconfigure(int argc, const char **argv) for (i = 0; i < scalar_repos.nr; i++) { int succeeded = 0; + struct repository *old_repo, r = { NULL }; const char *dir = scalar_repos.items[i].string; strbuf_reset(&commondir); @@ -712,13 +712,17 @@ static int cmd_reconfigure(int argc, const char **argv) git_config_clear(); + if (repo_init(&r, gitdir.buf, commondir.buf)) + goto loop_end; + + old_repo = the_repository; the_repository = &r; - r.commondir = commondir.buf; - r.gitdir = gitdir.buf; if (set_recommended_config(1) >= 0) succeeded = 1; + the_repository = old_repo; + loop_end: if (!succeeded) { res = -1; diff --git a/t/t9210-scalar.sh b/t/t9210-scalar.sh index 428339e342..a41b4fcc08 100755 --- a/t/t9210-scalar.sh +++ b/t/t9210-scalar.sh @@ -180,6 +180,44 @@ test_expect_success 'scalar reconfigure' ' test true = "$(git -C one/src config core.preloadIndex)" ' +test_expect_success 'scalar reconfigure --all with includeIf.onbranch' ' + repos="two three four" && + for num in $repos + do + git init $num/src && + scalar register $num/src && + git -C $num/src config includeif."onbranch:foo".path something && + git -C $num/src config core.preloadIndex false || return 1 + done && + + scalar reconfigure --all && + + for num in $repos + do + test true = "$(git -C $num/src config core.preloadIndex)" || return 1 + done +' + + test_expect_success 'scalar reconfigure --all with detached HEADs' ' + repos="two three four" && + for num in $repos + do + rm -rf $num/src && + git init $num/src && + scalar register $num/src && + git -C $num/src config core.preloadIndex false && + test_commit -C $num/src initial && + git -C $num/src switch --detach HEAD || return 1 + done && + + scalar reconfigure --all && + + for num in $repos + do + test true = "$(git -C $num/src config core.preloadIndex)" || return 1 + done +' + test_expect_success '`reconfigure -a` removes stale config entries' ' git init stale/src && scalar register stale && |