Merge branch 'jk/clone-unborn-head-in-bare' into maint

"git clone" from a repository whose HEAD is unborn into a bare
repository didn't follow the branch name the other side used, which
is corrected.

* jk/clone-unborn-head-in-bare:
  clone: handle unborn branch in bare repos

builtin/clone.c

@@ -1340,6 +1340,9 @@ int cmd_clone(int argc, const char **argv, const char *prefix)
 			our_head_points_at = remote_head_points_at;
 	}
 	else {
+		const char *branch;
+		char *ref;
+
 		if (option_branch)
 			die(_("Remote branch %s not found in upstream %s"),
 					option_branch, remote_name);
@@ -1350,24 +1353,22 @@ int cmd_clone(int argc, const char **argv, const char *prefix)
 		remote_head_points_at = NULL;
 		remote_head = NULL;
 		option_no_checkout = 1;
-		if (!option_bare) {
-			const char *branch;
-			char *ref;
-
-			if (transport_ls_refs_options.unborn_head_target &&
-			    skip_prefix(transport_ls_refs_options.unborn_head_target,
-					"refs/heads/", &branch)) {
-				ref = transport_ls_refs_options.unborn_head_target;
-				transport_ls_refs_options.unborn_head_target = NULL;
-				create_symref("HEAD", ref, reflog_msg.buf);
-			} else {
-				branch = git_default_branch_name(0);
-				ref = xstrfmt("refs/heads/%s", branch);
-			}
 
-			install_branch_config(0, branch, remote_name, ref);
-			free(ref);
+		if (transport_ls_refs_options.unborn_head_target &&
+		    skip_prefix(transport_ls_refs_options.unborn_head_target,
+				"refs/heads/", &branch)) {
+			ref = transport_ls_refs_options.unborn_head_target;
+			transport_ls_refs_options.unborn_head_target = NULL;
+			create_symref("HEAD", ref, reflog_msg.buf);
+		} else {
+			branch = git_default_branch_name(0);
+			ref = xstrfmt("refs/heads/%s", branch);
 		}
+
+		if (!option_bare)
+			install_branch_config(0, branch, remote_name, ref);
+
+		free(ref);
 	}
 
 	write_refspec_config(src_ref_prefix, our_head_points_at,

t/t5702-protocol-v2.sh

@@ -237,6 +237,19 @@ test_expect_success '...but not if explicitly forbidden by config' '
 	! grep "refs/heads/mydefaultbranch" file_empty_child/.git/HEAD
 '
 
+test_expect_success 'bare clone propagates empty default branch' '
+	test_when_finished "rm -rf file_empty_parent file_empty_child.git" &&
+
+	GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME= \
+	git -c init.defaultBranch=mydefaultbranch init file_empty_parent &&
+
+	GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME= \
+	git -c init.defaultBranch=main -c protocol.version=2 \
+		clone --bare \
+		"file://$(pwd)/file_empty_parent" file_empty_child.git &&
+	grep "refs/heads/mydefaultbranch" file_empty_child.git/HEAD
+'
+
 test_expect_success 'fetch with file:// using protocol v2' '
 	test_when_finished "rm -f log" &&