Support user-specified version

It would be helpful to have a version that is passed in on the command
line...especially with things like Jenkins build numbers.

giftwrap/build_spec.py

@@ -22,8 +22,9 @@ from giftwrap.settings import Settings
 
 class BuildSpec(object):
 
-    def __init__(self, manifest):
+    def __init__(self, manifest, version):
         self._manifest = yaml.load(manifest)
+        self.version = version
         self.settings = Settings.factory(self._manifest['settings'])
         self.projects = self._render_projects()
 
@@ -32,5 +33,6 @@ class BuildSpec(object):
         if 'projects' in self._manifest:
             for project in self._manifest['projects']:
                 projects.append(OpenstackProject.factory(self.settings,
-                                                         project))
+                                                         project,
+                                                         self.version))
         return projects

giftwrap/shell.py

@@ -44,7 +44,7 @@ def build(args):
         with open(args.manifest, 'r') as fh:
             manifest = fh.read()
 
-        buildspec = BuildSpec(manifest)
+        buildspec = BuildSpec(manifest, args.version)
         builder = giftwrap.builder.create_builder(buildspec)
         builder.build()
     except Exception as e:
@@ -64,6 +64,7 @@ def main():
     build_subcmd = subparsers.add_parser('build',
                                          description='build giftwrap packages')
     build_subcmd.add_argument('-m', '--manifest', required=True)
+    build_subcmd.add_argument('-v', '--version')
     build_subcmd.set_defaults(func=build)
 
     args = parser.parse_args()