Moved cirros image to /var/snap/microstack/common/images

This way, it will get cleaned up when we uninstall the snap.

Also added test hooks to test upgrades, to verify that we aren't
breaking existing snaps.

snap/hooks/configure

@@ -50,14 +50,16 @@ sleep 5
 # Wait for identity service
 while ! nc -z 10.20.20.1 5000; do sleep 0.1; done;
 
+# Setup the cirros image, which is used by the launch app
 openstack image show cirros || {
-    [ -f $HOME/images/cirros-0.3.5-x86_64-disk.img ] || {
-        mkdir -p $HOME/images
+    [ -f $SNAP_COMMON/images/cirros-0.4.0-x86_64-disk.img ] || {
+        mkdir -p $SNAP_COMMON/images
         wget \
-          http://download.cirros-cloud.net/0.3.5/cirros-0.3.5-x86_64-disk.img \
-          -O ${HOME}/images/cirros-0.3.5-x86_64-disk.img
+          http://download.cirros-cloud.net/0.4.0/cirros-0.4.0-x86_64-disk.img \
+          -O ${SNAP_COMMON}/images/cirros-0.4.0-x86_64-disk.img
     }
-    openstack image create --file ${HOME}/images/cirros-0.3.5-x86_64-disk.img \
+    openstack image create \
+        --file ${SNAP_COMMON}/images/cirros-0.4.0-x86_64-disk.img \
         --public --container-format=bare --disk-format=qcow2 cirros
 }
 

tests/basic-test.sh

@@ -2,6 +2,20 @@
 
 set -ex
 
+# Command line args.
+# Pass -u edge/candidate/stable to install
+# microstack from the matching channel in the snap store before
+# installing the locally built snap. This will help verify that we
+# aren't breaking snaps in the wild with a change.
+UPGRADE_FROM="none"
+while getopts u: option
+do
+    case "${option}"
+    in
+        u) UPGRADE_FROM=${OPTARG};;
+    esac
+done
+
 # Dependencies. TODO: move these into a testing harness
 command -v multipass > /dev/null || (echo "Please install multipass."; exit 1);
 command -v petname > /dev/null || (echo "Please install petname."; exit 1);
@@ -17,6 +31,14 @@ DISTRO=18.04
 # Launch a machine and copy the snap to it.
 multipass launch --cpus 2 --mem 16G $DISTRO --name $MACHINE
 multipass copy-files microstack_rocky_amd64.snap $MACHINE:
+
+# Possibly install a release of the snap before running a test.
+if [ "${UPGRADE_FROM}" != "none" ]; then
+    multipass exec $MACHINE -- sudo snap install --classic \
+              --${UPGRADE_FROM} microstack
+fi
+
+# Install the snap under test
 multipass exec $MACHINE -- \
           sudo snap install --classic --dangerous microstack*.snap