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796fda3f78
The GIT_DEFAULT_REF_FORMAT environment variable can be set to influence
the default ref format that new repostiories shall be initialized with.
While this is the expected behaviour when creating a new repository, it
is not when reinitializing a repository: we should retain the ref format
currently used by it in that case.
This doesn't work correctly right now:
$ git init --ref-format=files repo
Initialized empty Git repository in /tmp/repo/.git/
$ GIT_DEFAULT_REF_FORMAT=reftable git init repo
fatal: could not open '/tmp/repo/.git/refs/heads' for writing: Is a directory
Instead of retaining the current ref format, the reinitialization tries
to reinitialize the repository with the different format. This action
fails when git-init(1) tries to write the ".git/refs/heads" stub, which
in the context of the reftable backend is always written as a file so
that we can detect clients which inadvertently try to access the repo
with the wrong ref format. Seems like the protection mechanism works for
this case, as well.
Fix the issue by ignoring the environment variable in case the repo has
already been initialized with a ref storage format.
Signed-off-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Git - fast, scalable, distributed revision control system
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