remote: use the configured default branch name when appropriate

When guessing the default branch name of a remote, and there are no refs
to guess from, we want to go with the preference specified by the user
for the fall-back, i.e. the default name to be used for the initial
branch of new repositories (because as far as the user is concerned, a
remote that has no branches yet is a new repository).

At the same time, when talking to an older Git server that does not
report a symref for `HEAD` (but instead reports a commit hash), let's
try to guess the configured default branch name first. If it does not
match the reported commit hash, let's fall back to `master` as before.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 10 insertions, 1 deletions

diff --git a/t/t5606-clone-options.sh b/t/t5606-clone-options.sh
index 286bfd93ac..e69427f881 100755
--- a/t/t5606-clone-options.sh
+++ b/t/t5606-clone-options.sh
@@ -47,7 +47,16 @@ test_expect_success 'guesses initial branch name correctly' '
 	test_commit -C initial-branch no-spoilers &&
 	git -C initial-branch branch abc guess &&
 	git clone initial-branch is-it &&
-	test refs/heads/guess = $(git -C is-it symbolic-ref HEAD)
+	test refs/heads/guess = $(git -C is-it symbolic-ref HEAD) &&
+
+	git -c init.defaultBranch=none init --bare no-head &&
+	git -C initial-branch push ../no-head guess abc &&
+	git clone no-head is-it2 &&
+	test_must_fail git -C is-it2 symbolic-ref refs/remotes/origin/HEAD &&
+	git -C no-head update-ref --no-deref HEAD refs/heads/guess &&
+	git -c init.defaultBranch=guess clone no-head is-it3 &&
+	test refs/remotes/origin/guess = \
+		$(git -C is-it3 symbolic-ref refs/remotes/origin/HEAD)
 '
 
 test_done