Refactor gitclone recipe to support branches and develop.

slapos/recipe/gitclone.py

@@ -31,12 +31,16 @@ from subprocess import check_call
 
 GIT_DEFAULT_REMOTE_NAME = 'origin'
 GIT_DEFAULT_BRANCH_NAME = 'master'
+TRUE_VALUES = ['y', 'yes', '1', 'true']
 
 class Recipe(object):
+    """Clone a git repository."""
 
     def __init__(self, buildout, name, options):
         options.setdefault('branch', GIT_DEFAULT_BRANCH_NAME)
         options.setdefault('revision', '')
+        options.setdefault('branch', '')
+        options.setdefault('develop', 'false')
         options.setdefault('git-command', 'git')
         options.setdefault('location',
                            os.path.join(
@@ -46,31 +50,47 @@ class Recipe(object):
                           )
         self.options = options
 
+        if options['revision'] and options['branch']:
+          # revision and branch options are incompatible
+          raise ValueError('revision and branch parameters are set but are'
+              'incompatible. Please specify only one of them.')
 
 
+    def gitReset(self, revision=None):
+      """Operates git reset on the repository."""
+      command = [self.options['git-command'], 'reset', '--hard']
+      if revision:
+        command.append(revision)
+      check_call(command, cwd=self.options['location'])
+
     def install(self):
+      """ Do a git clone. If revision is specified, reset to it."""
       if not os.path.exists(self.options['location']):
-            check_call([self.options['git-command'], 'clone',
+        git_clone_command = [self.options['git-command'], 'clone',
                     self.options['url'],
-                        self.options['location']])
-
-        self.update()
+                    self.options['location']]
+        if self.options['branch']:
+          git_clone_command.extend(['--branch', self.options['branch']])
+        check_call(git_clone_command)
 
-        return []
+      if self.options['revision']:
+        self.gitReset(self.options['revision'])
 
+      return [self.options['location']]
 
 
     def update(self):
         check_call([self.options['git-command'], 'fetch', '--all'],
                    cwd=self.options['location'])
 
+        # If develop parameter is set, don't reset/update.
+        # Otherwise, reset --hard
+        if not self.options.get('develop') in TRUE_VALUES:
           if self.options['revision']:
-            check_call([self.options['git-command'],
-                        'reset', '--hard', self.options['revision']],
-                       cwd=self.options['location'])
+            self.gitReset(self.options['revision'])
+          elif self.options['branch']:
+            self.gitReset('%s/%s' % (
+                GIT_DEFAULT_REMOTE_NAME, self.options['branch']))
           else:
-            check_call([self.options['git-command'],
-                        'pull', GIT_DEFAULT_REMOTE_NAME,
-                        self.options['branch']],
-                       cwd=self.options['location']
-                      )
+            self.gitReset('%s/%s' % (
+                GIT_DEFAULT_REMOTE_NAME, GIT_DEFAULT_BRANCH_NAME))