deprecate GitPython

GitPython is not compatible with python3 and may never be:
https://fedoraproject.org/wiki/User:Churchyard/python3

test/functional/fixture.py

@@ -12,7 +12,6 @@
 # granted to use or replicate Red Hat trademarks that are incorporated
 # in this software or its documentation.
 
-import git
 import os
 import shutil
 import tempfile
@@ -117,23 +116,15 @@ class TitoGitTestFixture(unittest.TestCase):
         print("Testing in: %s" % self.repo_dir)
         print
 
-        # GitPython calls os.login(), which throws OSError if there is no tty,
-        # but GitPython allows to avoid the call if env var USER exists.
-        try:
-            os.getlogin()
-        except OSError:
-            os.environ['USER'] = 'nobody'
-
         # Initialize the repo:
-        self.repo = git.Repo.init(path=self.repo_dir, mkdir=True, bare=False)
+        os.chdir(self.repo_dir)
+        run_command('git init')
 
         # Next we tito init:
-        os.chdir(self.repo_dir)
         tito("init")
         run_command('echo "offline = true" >> rel-eng/tito.props')
-        index = self.repo.index
-        index.add(['rel-eng/tito.props'])
-        index.commit('Setting offline.')
+        run_command('git add rel-eng/tito.props')
+        run_command("git commit -m 'set offline in tito.props'")
 
     def tearDown(self):
         shutil.rmtree(self.repo_dir)
@@ -196,13 +187,12 @@ class TitoGitTestFixture(unittest.TestCase):
         out_f.write(TEST_PYTHON_SRC)
         out_f.close()
 
-        index = self.repo.index
         files = [os.path.join(pkg_dir, 'a.txt'),
                 os.path.join(pkg_dir, 'setup.py'),
                 os.path.join(pkg_dir, '%s.spec' % pkg_name),
                 os.path.join(pkg_dir, 'src/module.py')
         ]
-        index.add(files)
-        index.commit('Initial commit.')
+        run_command('git add %s' % ' '.join(files))
+        run_command("git commit -m 'initial commit'")
 
         tito('tag --keep-version --debug --accept-auto-changelog')

test/functional/multiproject_tests.py

@@ -68,20 +68,19 @@ class MultiProjectTests(TitoGitTestFixture):
         self.create_project(TEST_PKG_1, os.path.join(self.repo_dir, 'pkg1'))
         self.create_project(TEST_PKG_2, os.path.join(self.repo_dir, 'pkg2'))
         self.create_project(TEST_PKG_3, os.path.join(self.repo_dir, 'pkg3'))
-        os.chdir(self.repo_dir)
 
         # For second test package, use a tito.props to override and use the
         # ReleaseTagger:
-        os.chdir(os.path.join(self.repo_dir, 'pkg2'))
         filename = os.path.join(self.repo_dir, 'pkg2', "tito.props")
         out_f = open(filename, 'w')
         out_f.write("[buildconfig]\n")
         out_f.write("tagger = tito.tagger.ReleaseTagger\n")
         out_f.write("builder = tito.builder.Builder\n")
         out_f.close()
-        index = self.repo.index
-        index.add(['pkg2/tito.props'])
-        index.commit("Adding tito.props for pkg2.")
+
+        os.chdir(self.repo_dir)
+        run_command('git add pkg2/tito.props')
+        run_command("git commit -m 'add tito.props for pkg2'")
 
     def test_template_version_tagger(self):
         """
@@ -94,9 +93,10 @@ class MultiProjectTests(TitoGitTestFixture):
         run_command('mkdir -p %s' % join(self.repo_dir, 'rel-eng/templates'))
         self.write_file(join(self.repo_dir,
             'rel-eng/templates/version.rb'), VERSION_TEMPLATE_FILE)
-        index = self.repo.index
-        index.add(['pkg3/tito.props'])
-        index.commit("Adding tito.props for pkg3.")
+
+        os.chdir(self.repo_dir)
+        run_command('git add pkg3/tito.props')
+        run_command("git commit -m 'add tito.props for pkg3'")
 
         # Create another pkg3 tag and make sure we got a generated
         # template file.

test/functional/singleproject_tests.py

@@ -49,14 +49,21 @@ class SingleProjectTests(TitoGitTestFixture):
         check_tag_exists("%s-9.0.0-1" % PKG_NAME, offline=True)
 
     def test_undo_tag(self):
-        commit = self.repo.heads.master.commit
+        os.chdir(self.repo_dir)
+        original_head = getoutput('git show-ref -s refs/heads/master')
+
+        # Create tito tag, which adds a new commit and moves head.
         tito("tag --accept-auto-changelog --debug")
         tag = "%s-0.0.2-1" % PKG_NAME
         check_tag_exists(tag, offline=True)
-        self.assertNotEqual(commit, self.repo.heads.master.commit)
+        new_head = getoutput('git show-ref -s refs/heads/master')
+        self.assertNotEqual(original_head, new_head)
+
+        # Undo tito tag, which rewinds one commit to original head.
         tito("tag -u")
         self.assertFalse(tag_exists_locally(tag))
-        self.assertEqual(commit, self.repo.heads.master.commit)
+        new_head = getoutput('git show-ref -s refs/heads/master')
+        self.assertEqual(original_head, new_head)
 
     def test_latest_tgz(self):
         tito("build --tgz -o %s" % self.repo_dir)

test/unit/fixture.py

@@ -25,9 +25,7 @@ class TitoUnitTestFixture(unittest.TestCase):
     Fixture providing setup/teardown and utilities for unit tests.
     """
     def setUp(self):
-        # GitPython calls os.login(), which throws OSError if there is no tty,
-        # but GitPython allows to avoid the call if env var USER exists.
-        try:
-            os.getlogin()
-        except OSError:
-            os.environ['USER'] = 'nobody'
+        print
+        print
+        print("Testing in: %s" % REPO_DIR)
+        print