Git source: Make a shallow clone.

snapcraft/sources.py

@@ -127,7 +127,7 @@ def pull(self):
             if self.source_tag or self.source_branch:
                 branch_opts = ['--branch',
                                self.source_tag or self.source_branch]
-            cmd = ['git', 'clone'] + branch_opts + \
+            cmd = ['git', 'clone', '--depth', '1'] + branch_opts + \
                   [self.source, self.source_dir]
 
         subprocess.check_call(cmd)

snapcraft/tests/test_sources.py

@@ -136,25 +136,25 @@ def test_pull(self):
         git.pull()
 
         self.mock_run.assert_called_once_with(
-            ['git', 'clone', 'git://my-source', 'source_dir'])
+            ['git', 'clone', '--depth', '1', 'git://my-source', 'source_dir'])
 
     def test_pull_branch(self):
         git = snapcraft.sources.Git('git://my-source', 'source_dir',
                                     source_branch='my-branch')
         git.pull()
 
         self.mock_run.assert_called_once_with(
-            ['git', 'clone', '--branch', 'my-branch', 'git://my-source',
-             'source_dir'])
+            ['git', 'clone', '--depth', '1', '--branch', 'my-branch',
+             'git://my-source', 'source_dir'])
 
     def test_pull_tag(self):
         git = snapcraft.sources.Git('git://my-source', 'source_dir',
                                     source_tag='tag')
         git.pull()
 
         self.mock_run.assert_called_once_with(
-            ['git', 'clone', '--branch', 'tag', 'git://my-source',
-             'source_dir'])
+            ['git', 'clone', '--depth', '1', '--branch', 'tag',
+             'git://my-source', 'source_dir'])
 
     def test_pull_existing(self):
         self.mock_path_exists.return_value = True