From afe8a69ea9e8b224e05dd3ba7568e5b30a244552 Mon Sep 17 00:00:00 2001
From: Adam Gandelman <adamg@canonical.com>
Date: Wed, 22 May 2013 13:50:39 -0700
Subject: [PATCH] Add config-changed openstack upgrade support.

---
 hooks/config-changed               |  1 +
 hooks/swift-storage-node-common    | 19 +++++++++++++++++++
 hooks/swift-storage-node-relations | 14 ++++++++++++++
 3 files changed, 34 insertions(+)
 create mode 120000 hooks/config-changed

diff --git a/hooks/config-changed b/hooks/config-changed
new file mode 120000
index 0000000..68e4122
--- /dev/null
+++ b/hooks/config-changed
@@ -0,0 +1 @@
+swift-storage-node-relations
\ No newline at end of file
diff --git a/hooks/swift-storage-node-common b/hooks/swift-storage-node-common
index 342f351..9972214 100755
--- a/hooks/swift-storage-node-common
+++ b/hooks/swift-storage-node-common
@@ -129,3 +129,22 @@ function setup_storage {
   done
   chown -R swift:swift /srv/node
 }
+
+function do_openstack_upgrade {
+  # update openstack components to those provided by a new installation source
+  # it is assumed the calling hook has confirmed that the upgrade is sane.
+  local rel="$1"
+  shift
+  local packages=$@
+
+  # Backup the config directory.
+  local stamp=$(date +"%Y%m%d%M%S")
+  tar -pcf /var/lib/juju/$CHARM-backup-$stamp.tar $CONF_DIR
+
+  configure_install_source "$rel"
+  apt-get update
+  DEBIAN_FRONTEND=noninteractive apt-get \
+     --option Dpkg::Options::=--force-confnew -y \
+     install --no-install-recommends $packages
+  swift-init all restart || true
+}
diff --git a/hooks/swift-storage-node-relations b/hooks/swift-storage-node-relations
index ea53b48..0a81996 100755
--- a/hooks/swift-storage-node-relations
+++ b/hooks/swift-storage-node-relations
@@ -67,9 +67,23 @@ function storage_changed {
   swift-init all start || true
 }
 
+function config_changed {
+  local install_src=$(config-get openstack-origin)
+  local cur=$(get_os_codename_package "glance-common")
+  local available=$(get_os_codename_install_source "$install_src")
+  if [[ "$available" != "unknown" ]] ; then
+    if dpkg --compare-versions $(get_os_version_codename "$cur") lt \
+                               $(get_os_version_codename "$available") ; then
+      juju-log "$CHARM: Upgrading OpenStack release: $cur -> $available."
+      do_openstack_upgrade "$install_src" $PACKAGES
+    fi
+  fi
+}
+
 case $ARG0 in
   "install") install_hook ;;
   "start"|"stop") exit 0 ;;
   "swift-storage-relation-joined") storage_joined ;;
   "swift-storage-relation-changed") storage_changed ;;
+  "config-changed") config_changed ;;
 esac