Remove the compiled python bytecode

upgrade-charm could previously fail because of compiled
bytecode remaining behind. This change makes the upgrade-charm
hook remove any such compiled bytecode files

Closes-Bug: 1628322

Change-Id: I3886b514b47d6fc9fdfb350e2b3a2296472e40f6

hooks/ceph_hooks.py

@@ -446,7 +446,7 @@ def mon_relation():
         log('mon cluster has not yet provided conf')
 
 
-@hooks.hook('upgrade-charm')
+@hooks.hook('upgrade-charm.real')
 @harden()
 def upgrade_charm():
     if get_fsid() and get_auth():

hooks/upgrade-charm

@@ -1 +0,0 @@
-ceph_hooks.py

hooks/upgrade-charm

@@ -0,0 +1,6 @@
+#!/bin/bash
+# Wrapper to ensure that old python bytecode isn't hanging around
+# after we upgrade the charm with newer libraries
+rm -rf **/*.pyc
+
+exec ./hooks/upgrade-charm.real

hooks/upgrade-charm.real

@@ -0,0 +1 @@
+ceph_hooks.py