cache: don't initalize cloud cache until its needed (#5264)

dvc/cache/__init__.py

@@ -65,18 +65,23 @@ class Cache:
 
         self._cache[Schemes.LOCAL] = _get_cache(repo, settings)
 
-        for scheme in self.CLOUD_SCHEMES:
+    def _initalize_cloud_cache(self, schemes):
+        for scheme in schemes:
             remote = self.config.get(scheme)
             settings = {"name": remote} if remote else None
-            self._cache[scheme] = _get_cache(repo, settings)
+            self._cache[scheme] = _get_cache(self.repo, settings)
 
     def __getattr__(self, name):
+        if name not in self._cache and name in self.CLOUD_SCHEMES:
+            self._initalize_cloud_cache([name])
+
         try:
             return self._cache[name]
         except KeyError as exc:
             raise AttributeError from exc
 
     def by_scheme(self):
+        self._initalize_cloud_cache(self.CLOUD_SCHEMES)
         yield from self._cache.items()
 
 

tests/unit/repo/test_repo.py

@@ -132,3 +132,12 @@ def test_branch_config(tmp_dir, scm):
 
     dvc = Repo(scm=scm, rev="branch")
     assert dvc.config["remote"]["branch"]["url"] == "/some/path"
+
+
+def test_dynamic_cache_initalization(tmp_dir, scm):
+    dvc = Repo.init()
+    with dvc.config.edit() as conf:
+        conf["cache"]["ssh"] = "foo"
+        conf["remote"]["foo"] = {"url": "remote://bar/baz"}
+
+    Repo(str(tmp_dir))