clone --bare: Add ".git" suffix to the directory name to clone into

We have a tradition that bare repositories live in directories ending
in ".git".  To make this more a convention than just a tradition, teach
"git clone --bare" to add a ".git" suffix to the directory name.

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

builtin-clone.c

@@ -95,7 +95,7 @@ static char *get_repo_path(const char *repo, int *is_bundle)
 	return NULL;
 }
 
-static char *guess_dir_name(const char *repo, int is_bundle)
+static char *guess_dir_name(const char *repo, int is_bundle, int is_bare)
 {
 	const char *end = repo + strlen(repo), *start;
 
@@ -131,6 +131,12 @@ static char *guess_dir_name(const char *repo, int is_bundle)
 			end -= 4;
 	}
 
+	if (is_bare) {
+		char *result = xmalloc(end - start + 5);
+		sprintf(result, "%.*s.git", (int)(end - start), start);
+		return result;
+	}
+
 	return xstrndup(start, end - start);
 }
 
@@ -389,7 +395,7 @@ int cmd_clone(int argc, const char **argv, const char *prefix)
 	if (argc == 2)
 		dir = xstrdup(argv[1]);
 	else
-		dir = guess_dir_name(repo_name, is_bundle);
+		dir = guess_dir_name(repo_name, is_bundle, option_bare);
 
 	if (!stat(dir, &buf))
 		die("destination directory '%s' already exists.", dir);

t/t5601-clone.sh

@@ -82,4 +82,11 @@ test_expect_success 'clone --mirror' '
 
 '
 
+test_expect_success 'clone --bare names the local repository <name>.git' '
+
+	git clone --bare src &&
+	test -d src.git
+
+'
+
 test_done