It matters for linked checkouts where 'refs' directory won't be
available in $GIT_DIR. is_git_directory() knows about $GIT_COMMON_DIR
and can handle this case.

Signed-off-by: Nguyễn Thái Ngọc Duy <[email protected]>
---
 path.c             |  3 +--
 t/t0002-gitfile.sh | 14 ++++++++++++++
 2 files changed, 15 insertions(+), 2 deletions(-)

diff --git a/path.c b/path.c
index a536ee3..7340e11 100644
--- a/path.c
+++ b/path.c
@@ -441,8 +441,7 @@ const char *enter_repo(const char *path, int strict)
        else if (chdir(path))
                return NULL;
 
-       if (access("objects", X_OK) == 0 && access("refs", X_OK) == 0 &&
-           validate_headref("HEAD") == 0) {
+       if (is_git_directory(".")) {
                set_git_dir(".");
                check_repository_format();
                return path;
diff --git a/t/t0002-gitfile.sh b/t/t0002-gitfile.sh
index 545bfe2..2e709cc 100755
--- a/t/t0002-gitfile.sh
+++ b/t/t0002-gitfile.sh
@@ -134,4 +134,18 @@ test_expect_success 'enter_repo non-strict mode' '
        test_cmp expected actual
 '
 
+test_expect_success 'enter_repo linked checkout' '
+       (
+               cd enter_repo &&
+               git worktree add  ../foo refs/tags/foo
+       ) &&
+       git ls-remote foo >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

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