store git commit hash to build.source

Git HEAD commit hash is now stored in build.info field. this field is
currently used by content generators, but not by other builds. Also
original checked out url is stored in build.extra.url field.

Fixes: https://pagure.io/koji/issue/550

builder/kojid

@@ -868,6 +868,10 @@ class BuildTask(BaseTaskHandler):
         h = self.readSRPMHeader(srpm)
         data = koji.get_header_fields(h,['name','version','release','epoch'])
         data['task_id'] = self.id
+        if getattr(self, 'source'):
+            data['source'] = self.source['source']
+            data['extra'] = {'url': self.source['url']}
+
         extra_arches = None
         self.logger.info("Reading package config for %(name)s" % data)
         pkg_cfg = self.session.getPackageConfig(dest_tag,data['name'],event=self.event_id)
@@ -933,6 +937,7 @@ class BuildTask(BaseTaskHandler):
                                             parent=self.id)
         # wait for subtask to finish
         result = self.wait(task_id)[task_id]
+        self.source = result['source']
         srpm = result['srpm']
         return srpm
 
@@ -4565,6 +4570,7 @@ class BuildSRPMFromSCMTask(BaseBuildTask):
                 'logs': ["%s/%s" % (uploadpath, os.path.basename(f))
                                         for f in log_files],
                 'brootid': brootid,
+                'source': scm.get_source(),
                }
 
 class TagNotificationTask(BaseTaskHandler):