show-scope is only available git>=2.26

Change-Id: Ie83edb34f2e582ccca177e36010344788a090376
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/5874040
Reviewed-by: Josip Sokcevic <sokcevic@chromium.org>
Commit-Queue: Josip Sokcevic <sokcevic@chromium.org>

scm.py

@@ -387,7 +387,11 @@ class GitConfigStateReal(GitConfigStateBase):
     def load_config(self) -> GitFlatConfigData:
         # NOTE: `git config --list` already canonicalizes keys.
         try:
-            rawConfig = GIT.Capture(['config', '--list', '-z', '--show-scope'],
+            gitConfigCmd = ['config', '--list', '-z', '--show-scope']
+            if git_common.get_git_version() <= (2, 25):
+                gitConfigCmd = ['config', '--list', '-z']
+
+            rawConfig = GIT.Capture(gitConfigCmd,
                                     cwd=self.root,
                                     strip_out=False)
         except subprocess2.CalledProcessError:

tests/scm_unittest.py

@@ -514,6 +514,35 @@ class GitConfigStateTestTest(unittest.TestCase):
                 },
             })
 
+    @mock.patch('git_common.get_git_version')
+    @mock.patch('scm.GIT.Capture')
+    def test_load_config_git_version_2_old(self, mock_capture,
+                                           mock_get_git_version):
+        mock_get_git_version.return_value = (2, 25)
+        mock_capture.return_value = ""
+
+        config_state = scm.GitConfigStateReal("/fake/path")
+        config_state.load_config()
+
+        mock_capture.assert_called_once_with(['config', '--list', '-z'],
+                                             cwd=config_state.root,
+                                             strip_out=False)
+
+    @mock.patch('git_common.get_git_version')
+    @mock.patch('scm.GIT.Capture')
+    def test_load_config_git_version_new(self, mock_capture,
+                                         mock_get_git_version):
+        mock_get_git_version.return_value = (2, 26)
+        mock_capture.return_value = ""
+
+        config_state = scm.GitConfigStateReal("/fake/path")
+        config_state.load_config()
+
+        mock_capture.assert_called_once_with(
+            ['config', '--list', '-z', '--show-scope'],
+            cwd=config_state.root,
+            strip_out=False)
+
     def test_construction_system(self):
         m, gs = self._make(
             global_state={'section.key': ['global']},