[PATCH 08/11] t5801: make remote-testgit GIT_DIR setup more robust

[Jeff King <peff@peff.net>]

Our tests use a fake helper that just imports from an existing Git
repository. We're fed the path to that repo on the command line, and
derive the GIT_DIR by tacking on "/.git".

This is wrong if the path is a bare repository, but that's OK since this
is just a limited test. But it's also wrong if the transport code feeds
us the actual .git directory itself (i.e., we expect "/path/to/repo" but
it gives us "/path/to/repo/.git"). None of the current tests do that,
but let's future-proof ourselves against adding a test that does.

We can instead ask "rev-parse" to set our GIT_DIR. Note that we have to
first unset other git variables from our environment. Coming into this
script, we'll have GIT_DIR set to the fetching repository, and we need
to "switch" to the remote one.

Signed-off-by: Jeff King <peff@peff.net>
---
 t/t5801/git-remote-testgit | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/t/t5801/git-remote-testgit b/t/t5801/git-remote-testgit
index c5b10f5775..f8b476499f 100755
--- a/t/t5801/git-remote-testgit
+++ b/t/t5801/git-remote-testgit
@@ -26,7 +26,8 @@ then
 	t_refspec=""
 fi
 
-GIT_DIR="$url/.git"
+unset $(git rev-parse --local-env-vars)
+GIT_DIR=$(git -C "$url" rev-parse --absolute-git-dir)
 export GIT_DIR
 
 force=
-- 
2.45.2.937.g0bcb3c087a