add: auto convert absolute_path => relative (iterative#2975)

* add: auto convert absolute_path => relative

- fixes iterative#2955

* use path_isin

* catch-all absolute paths in repo

* unneeded leftover

* revert realtive imports for later

* output: move abs2relpath from Base to Local

* output:local:fix parse_path

* remove path_info

* test:local versus base abs2relpath

* test:fix remaining abs2relpath test

* output: local path relative to wdir

* output: local: modify path before inheritance

* output: local: minor inheritance fix

* test: local: split output test

* test: local: positively explicit

dvc/output/local.py

@@ -18,6 +18,12 @@ class OutputLOCAL(OutputBase):
     REMOTE = RemoteLOCAL
     sep = os.sep
 
+    def __init__(self, stage, path, *args, **kwargs):
+        if stage and path_isin(path, stage.repo.root_dir):
+            path = relpath(path, stage.wdir)
+
+        super().__init__(stage, path, *args, **kwargs)
+
     def _parse_path(self, remote, path):
         parsed = urlparse(path)
         if parsed.scheme == "remote":

tests/func/test_add.py

@@ -216,7 +216,7 @@ def test(self):
         self.assertEqual(ret, 0)
 
         d = load_stage_file("bar.dvc")
-        self.assertEqual(d["outs"][0]["path"], bar)
+        self.assertEqual(d["outs"][0]["path"], self.BAR)
 
 
 class TestCmdAdd(TestDvc):

tests/unit/output/test_local.py

@@ -42,13 +42,28 @@ def test_str_workdir_inside_repo(dvc):
     assert os.path.join("some_folder", "path") == str(output)
 
 
-def test_str_on_absolute_path(dvc):
+def test_str_on_local_absolute_path(dvc):
     stage = Stage(dvc)
 
-    path = os.path.abspath(os.path.join("path", "to", "file"))
-    output = OutputLOCAL(stage, path, cache=False)
+    rel_path = os.path.join("path", "to", "file")
+    abs_path = os.path.abspath(rel_path)
+    output = OutputLOCAL(stage, abs_path, cache=False)
 
-    assert path == str(output)
+    assert output.def_path == rel_path
+    assert output.path_info.fspath == abs_path
+    assert str(output) == rel_path
+
+
+def test_str_on_external_absolute_path(dvc):
+    stage = Stage(dvc)
+
+    rel_path = os.path.join("..", "path", "to", "file")
+    abs_path = os.path.abspath(rel_path)
+    output = OutputLOCAL(stage, abs_path, cache=False)
+
+    assert output.def_path == abs_path
+    assert output.path_info.fspath == abs_path
+    assert str(output) == abs_path
 
 
 class TestGetFilesNumber(TestDvc):