PR#3272: Webui: add free task for admin

Merges #3272
https://pagure.io/koji/pull-request/3272

Fixes: #2895
https://pagure.io/koji/issue/2895
RFE: web ui can provide "free" task action

www/kojiweb/index.py

@@ -807,6 +807,15 @@ def canceltask(environ, taskID):
     _redirect(environ, 'taskinfo?taskID=%i' % taskID)
 
 
+def freetask(environ, taskID):
+    server = _getServer(environ)
+    _assertLogin(environ)
+
+    taskID = int(taskID)
+    server.freeTask(taskID)
+    _redirect(environ, 'taskinfo?taskID=%i' % taskID)
+
+
 def _sortByExtAndName(item):
     """Sort filename tuples key function, first by extension, and then by name."""
     kRoot, kExt = os.path.splitext(os.path.basename(item[1]))

www/kojiweb/taskinfo.chtml

@@ -63,6 +63,9 @@
       <span class="adminLink">(<a href="resubmittask?taskID=$task.id$util.authToken($self)">resubmit</a>)</span>
       #end if
       #end if
+      #if $currentUser and 'admin' in $perms and $task.state in ($koji.TASK_STATES.OPEN, $koji.TASK_STATES.ASSIGNED)
+      <span class="adminLink">(<a href="freetask?taskID=$task.id$util.authToken($self)">free</a>)</span>
+      #end if
       </td>
     </tr>
     #if $taskBuild