Implement getting git version in VCS module and use it

Signed-off-by: Michal Čihař <michal@cihar.com>

weblate/requirements.py

@@ -21,6 +21,7 @@
 # For some reasons, this fails in PyLint sometimes...
 # pylint: disable=E0611,F0401
 from distutils.version import LooseVersion
+from weblate.trans.vcs import GitRepository
 import importlib
 import sys
 
@@ -149,19 +150,12 @@ def get_versions():
         '0.5.4',
     ))
 
-    name = 'Git'
-    url = 'http://git-scm.com/'
-    mod = get_version_module('git', name, url)
-    try:
-        result.append((
-            name,
-            url,
-            mod.Git().version().replace('git version ', ''),
-            '1.7.2',
-        ))
-    except TypeError:
-        # Happens with too old GitPython
-        pass
+    result.append((
+        'Git',
+        'http://git-scm.com/',
+        GitRepository.get_version(),
+        '1.7.2',
+    ))
 
     name = 'South'
     url = 'http://south.aeracode.org/'

weblate/trans/tests/test_vcs.py

@@ -111,3 +111,6 @@ class VCSGitTest(RepoTestCase):
         repo = GitRepository.clone(self.repo_path, self._tempdir)
         self.assertFalse(repo.needs_merge('master'))
         self.assertFalse(repo.needs_push('master'))
+
+    def test_get_version(self):
+        self.assertTrue(GitRepository.get_version() != '')

weblate/trans/vcs.py

@@ -164,6 +164,13 @@ class Repository(object):
         """
         raise NotImplementedError()
 
+    @classmethod
+    def get_version(cls):
+        """
+        Returns VCS program version.
+        """
+        return cls._popen(['--version'])
+
 
 class GitRepository(Repository):
     """
@@ -258,3 +265,10 @@ class GitRepository(Repository):
         (has additional revisions).
         """
         return self._log_revisions('origin/{0}..'.format(branch)) != ''
+
+    @classmethod
+    def get_version(cls):
+        """
+        Returns VCS program version.
+        """
+        return cls._popen(['--version']).split()[-1]