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| author |  brian m. carlson <sandals@crustytoothpaste.net> | 2020-09-20 22:35:41 +0000 |
|---|---|---|
| committer |  Junio C Hamano <gitster@pobox.com> | 2020-09-22 09:22:32 -0700 |
| commit | 47ac970309dc26c95c4de4991b2e6aa7c7b7f615 (patch) | |
| tree | 51c75b3ca67e7eb2301d0e18c9389972c46dacbc /t | |
| parent | Fifteenth batch (diff) | |
| download | tgif-47ac970309dc26c95c4de4991b2e6aa7c7b7f615.tar.xz | |
builtin/clone: avoid failure with GIT_DEFAULT_HASH
If a user is cloning a SHA-1 repository with GIT_DEFAULT_HASH set to
"sha256", then we can end up with a repository where the repository
format version is 0 but the extensions.objectformat key is set to
"sha256". This is both wrong (the user has a SHA-1 repository) and
nonfunctional (because the extension cannot be used in a v0 repository).
This happens because in a clone, we initially set up the repository, and
then change its algorithm based on what the remote side tells us it's
using. We've initially set up the repository as SHA-256 in this case,
and then later on reset the repository version without clearing the
extension.
We could just always set the extension in this case, but that would mean
that our SHA-1 repositories weren't compatible with older Git versions,
even though there's no reason why they shouldn't be. And we also don't
want to initialize the repository as SHA-1 initially, since that means
if we're cloning an empty repository, we'll have failed to honor the
GIT_DEFAULT_HASH variable and will end up with a SHA-1 repository, not a
SHA-256 repository.
Neither of those are appealing, so let's tell the repository
initialization code if we're doing a reinit like this, and if so, to
clear the extension if we're using SHA-1. This makes sure we produce a
valid and functional repository and doesn't break any of our other use
cases.
Reported-by: Matheus Tavares <matheus.bernardino@usp.br>
Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Diffstat (limited to 't')
| -rwxr-xr-x | t/t5601-clone.sh | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/t/t5601-clone.sh b/t/t5601-clone.sh index 15fb64c18d..b6c8312da1 100755 --- a/t/t5601-clone.sh +++ b/t/t5601-clone.sh @@ -631,6 +631,20 @@ test_expect_success CASE_INSENSITIVE_FS 'colliding file detection' ' test_i18ngrep "the following paths have collided" icasefs/warning ' +test_expect_success 'clone with GIT_DEFAULT_HASH' ' + ( + sane_unset GIT_DEFAULT_HASH && + git init --object-format=sha1 test-sha1 && + git init --object-format=sha256 test-sha256 + ) && + test_commit -C test-sha1 foo && + test_commit -C test-sha256 foo && + GIT_DEFAULT_HASH=sha1 git clone test-sha256 test-clone-sha256 && + GIT_DEFAULT_HASH=sha256 git clone test-sha1 test-clone-sha1 && + git -C test-clone-sha1 status && + git -C test-clone-sha256 status +' + partial_clone_server () { SERVER="$1" && |