list: don't clone local repos (#5341)

* repo: introduce Repo.open

* ls: don't clone local repos

dvc/external_repo.py

@@ -59,13 +59,17 @@ def external_repo(
         url=url,
         scm=None if for_write else Git(root_dir),
         rev=None if for_write else rev,
-        subrepos=not for_write,
-        uninitialized=True,
         config=config,
         repo_factory=make_repo,
         **kwargs,
     )
 
+    if "subrepos" not in repo_kwargs:
+        repo_kwargs["subrepos"] = True
+
+    if "uninitialized" not in repo_kwargs:
+        repo_kwargs["uninitialized"] = True
+
     repo = Repo(**repo_kwargs)
 
     try:

dvc/repo/__init__.py

@@ -202,6 +202,18 @@ class Repo:
     def __str__(self):
         return self.url or self.root_dir
 
+    @staticmethod
+    @contextmanager
+    def open(url, *args, **kwargs):
+        if os.path.exists(url):
+            yield Repo(url, *args, **kwargs)
+            return
+
+        from dvc.external_repo import external_repo
+
+        with external_repo(url, *args, **kwargs) as repo:
+            yield repo
+
     @cached_property
     def scm(self):
         from dvc.scm import SCM

dvc/repo/ls.py

@@ -28,9 +28,9 @@ def ls(
             "isexec": bool,
         }
     """
-    from dvc.external_repo import external_repo
+    from . import Repo
 
-    with external_repo(url, rev) as repo:
+    with Repo.open(url, rev, subrepos=True, uninitialized=True) as repo:
         path_info = PathInfo(repo.root_dir)
         if path:
             path_info /= path