[PATCH v4 4/6] enter_repo: allow .git files in strict mode

["Nguyễn Thái Ngọc Duy" <pclouds@gmail.com>]

Strict mode is about not guessing where .git is. If the user points to a
.git file, we know exactly where the target .git dir will be. This makes
it possible to serve .git files as repository on the server side.

This may be needed even in local clone case because transport.c code
uses upload-pack for fetching remote refs. But right now the
clone/transport code goes with non-strict.

Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
---
 path.c             |  9 +++++++--
 t/t0002-gitfile.sh | 10 ++++++++++
 2 files changed, 17 insertions(+), 2 deletions(-)

diff --git a/path.c b/path.c
index 7340e11..a346134 100644
--- a/path.c
+++ b/path.c
@@ -438,8 +438,13 @@ const char *enter_repo(const char *path, int strict)
 			return NULL;
 		path = validated_path;
 	}
-	else if (chdir(path))
-		return NULL;
+	else {
+		const char *gitfile = read_gitfile(path);
+		if (gitfile)
+			path = gitfile;
+		if (chdir(path))
+			return NULL;
+	}
 
 	if (is_git_directory(".")) {
 		set_git_dir(".");
diff --git a/t/t0002-gitfile.sh b/t/t0002-gitfile.sh
index 2e709cc..9670e8c 100755
--- a/t/t0002-gitfile.sh
+++ b/t/t0002-gitfile.sh
@@ -148,4 +148,14 @@ test_expect_success 'enter_repo linked checkout' '
 	test_cmp expected actual
 '
 
+test_expect_success 'enter_repo strict mode' '
+	git ls-remote --upload-pack="git upload-pack --strict" foo/.git >actual &&
+	cat >expected <<-\EOF &&
+	946e985ab20de757ca5b872b16d64e92ff3803a9	HEAD
+	946e985ab20de757ca5b872b16d64e92ff3803a9	refs/heads/master
+	946e985ab20de757ca5b872b16d64e92ff3803a9	refs/tags/foo
+	EOF
+	test_cmp expected actual
+'
+
 test_done
-- 
2.3.0.rc1.137.g477eb31