From 2206d4a2754a116e365cf0619ee400445cd32e1f Mon Sep 17 00:00:00 2001
From: David Ames <david.ames@canonical.com>
Date: Wed, 17 Oct 2018 10:49:39 -0700
Subject: [PATCH] Series Upgrade

Implement the series-upgrade feature allowing to move between Ubuntu
series.

Change-Id: Iccab9ef5c129993c9599bf8c54b685ed7f73e659
---
 hooks/cinder_backup_hooks.py | 24 ++++++++++++++++++++++++
 hooks/post-series-upgrade    |  1 +
 hooks/pre-series-upgrade     |  1 +
 3 files changed, 26 insertions(+)
 create mode 120000 hooks/post-series-upgrade
 create mode 120000 hooks/pre-series-upgrade

diff --git a/hooks/cinder_backup_hooks.py b/hooks/cinder_backup_hooks.py
index 57807c0..083b19e 100755
--- a/hooks/cinder_backup_hooks.py
+++ b/hooks/cinder_backup_hooks.py
@@ -46,6 +46,10 @@ from charmhelpers.core.host import (
 from charmhelpers.contrib.openstack.utils import (
     set_os_workload_status,
     os_application_version_set,
+    set_unit_paused,
+    set_unit_upgrading,
+    clear_unit_paused,
+    clear_unit_upgrading,
 )
 from charmhelpers.contrib.storage.linux.ceph import (
     delete_keyring,
@@ -161,6 +165,26 @@ def upgrade_charm():
             backup_backend_joined(rid)
 
 
+@hooks.hook('pre-series-upgrade')
+def pre_series_upgrade():
+    log("Running prepare series upgrade hook", "INFO")
+    # In order to indicate the step of the series upgrade process for
+    # administrators and automated scripts, the charm sets the paused and
+    # upgrading states.
+    set_unit_paused()
+    set_unit_upgrading()
+
+
+@hooks.hook('post-series-upgrade')
+def post_series_upgrade():
+    log("Running complete series upgrade hook", "INFO")
+    # In order to indicate the step of the series upgrade process for
+    # administrators and automated scripts, the charm clears the paused and
+    # upgrading states.
+    clear_unit_paused()
+    clear_unit_upgrading()
+
+
 if __name__ == '__main__':
     try:
         hooks.execute(sys.argv)
diff --git a/hooks/post-series-upgrade b/hooks/post-series-upgrade
new file mode 120000
index 0000000..1fec4e3
--- /dev/null
+++ b/hooks/post-series-upgrade
@@ -0,0 +1 @@
+cinder_backup_hooks.py
\ No newline at end of file
diff --git a/hooks/pre-series-upgrade b/hooks/pre-series-upgrade
new file mode 120000
index 0000000..1fec4e3
--- /dev/null
+++ b/hooks/pre-series-upgrade
@@ -0,0 +1 @@
+cinder_backup_hooks.py
\ No newline at end of file