Add discard routine to system log cli and api

solar/solar/cli/system_log.py

@@ -102,6 +102,11 @@ def revert(uid):
     except errors.SolarError as er:
         raise click.BadParameter(str(er))
 
+@changes.command()
+def discard():
+    change.discard_all()
+
+
 @changes.command()
 @click.option('--name', default=None)
 def test(name):

solar/solar/core/resource/resource.py

@@ -172,6 +172,10 @@ class Resource(object):
         self.db_obj.state = RESOURCE_STATE.error.name
         self.db_obj.save()
 
+    def set_created(self):
+        self.db_obj.state = RESOURCE_STATE.created.name
+        self.db_obj.save()
+
     def to_be_removed(self):
         return self.db_obj.state == RESOURCE_STATE.removed.name
 

solar/solar/system_log/change.py

@@ -195,3 +195,34 @@ def _revert_run(logitem):
 def revert(uid):
     return revert_uids([uid])
 
+
+def _discard_remove(item):
+    resource_obj = resource.load(item.res)
+    resource_obj.set_created()
+
+_discard_update = _revert_update
+_discard_run = _revert_run
+
+
+def discard_uids(uids):
+    staged_log = data.SL()
+    for uid in uids:
+        item = staged_log.get(uid)
+        if item.action == CHANGES.update.name:
+            _discard_update(item)
+        elif item.action == CHANGES.remove.name:
+            _discard_remove(item)
+        elif item.action == CHANGES.run.name:
+            _discard_run(item)
+        else:
+            log.debug('Action %s for resource %s is a side'
+                      ' effect of another action', item.action, item.res)
+        staged_log.pop(uid)
+
+
+def discard_uid(uid):
+    return discard_uids([uid])
+
+def discard_all():
+    staged_log = data.SL()
+    return discard_uids([l.uid for l in staged_log])