add the target property, and change the initializer to handle the cases where common is specified in the git branch

src/centpkg/__init__.py

@@ -34,9 +34,30 @@ class DistGitDirectory(object):
         sigtobranchre = r'sig-(?P<signame>\w+)(?P<centosversion>\d)-?(?P<projectname>\w+)?-?(?P<releasename>\w+)?'
         match = re.match(sigtobranchre, branchtext)
         if match:
-            self.__dict__.update(match.groupdict())
+            gd = match.groupdict()
+            self.signame = gd['signame']
+            self.centosversion = gd['centosversion']
 
-class Commands(pyrpkg.Commands):
+            if gd['projectname'] != 'common':
+                self.projectname = gd['projectname']
+            if gd['releasename'] != 'common':
+                self.releasename = gd['releasename']
+
+    @property
+    def target(self):
+        projectorcommon = self.projectname
+        releaseorcommon = self.releasename
+
+        if not releaseorcommon:
+            if not projectorcommon or projectorcommon == 'common':
+                projectorcommon = 'common'
+            else:
+                releaseorcommon = 'common'
+
+        return '-'.join(filter(None, [self.signame+self.centosversion,
+                                      projectorcommon, releaseorcommon])) + '-el{0}'.format(self.centosversion)
+
+class Commands(Commands):
     '''
         For the pyrpkg commands with centpkg behavior
     '''