import: check erepo is None before modifying url - fixes #3780 (#3781)

* import: check erepo is None before modifying url - fixes #3780

* import: add test to cover this local import

dvc/repo/imp_url.py

@@ -17,8 +17,12 @@ def imp_url(self, url, out=None, fname=None, erepo=None, locked=True):
     out = resolve_output(url, out)
     path, wdir, out = resolve_paths(self, out)
 
-    # NOTE: when user is importing something from within his own repository
-    if os.path.exists(url) and path_isin(os.path.abspath(url), self.root_dir):
+    # NOTE: when user is importing something from within their own repository
+    if (
+        erepo is None
+        and os.path.exists(url)
+        and path_isin(os.path.abspath(url), self.root_dir)
+    ):
         url = relpath(url, wdir)
 
     stage = create_stage(

tests/func/test_import.py

@@ -342,3 +342,9 @@ def test_import_pipeline_tracked_outs(
             "file:///{}".format(fspath(tmp_dir)), "bar", out="baz"
         )
         assert (erepo_dir / "baz").read_text() == "foo"
+
+
+def test_local_import(tmp_dir, dvc, scm):
+    tmp_dir.dvc_gen("foo", "foo", commit="init")
+    (tmp_dir / "outdir").mkdir()
+    dvc.imp(".", "foo", out="outdir")