Update kubernetes-e2e charm to use snaps

cluster/juju/layers/kubernetes-e2e/actions/test

@@ -2,6 +2,8 @@
 
 set -ex
 
+export PATH="$PATH:/snap/bin"
+
 # Grab the action parameter values
 FOCUS=$(action-get focus)
 SKIP=$(action-get skip)
@@ -26,7 +28,7 @@ ACTION_JUNIT_TGZ=$ACTION_JUNIT.tar.gz
 # This initializes an e2e build log with the START TIMESTAMP.
 echo "JUJU_E2E_START=$(date -u +%s)" | tee $ACTION_LOG
 echo "JUJU_E2E_VERSION=$(kubectl version | grep Server | cut -d " " -f 5 | cut -d ":" -f 2 | sed s/\"// | sed s/\",//)" | tee -a $ACTION_LOG
-ginkgo -nodes=$PARALLELISM $(which e2e.test) -- \
+GINKGO_ARGS="-nodes=$PARALLELISM" kubernetes-test.e2e \
   -kubeconfig /home/ubuntu/.kube/config \
   -host $SERVER \
   -ginkgo.focus $FOCUS \

cluster/juju/layers/kubernetes-e2e/config.yaml

+options:
+  channel:
+    type: string
+    default: "stable"
+    description: |
+      Snap channel to install Kubernetes snaps from

cluster/juju/layers/kubernetes-e2e/layer.yaml

@@ -2,6 +2,7 @@ repo: https://github.com/juju-solutions/layer-kubernetes-e2e
 includes:
   - layer:basic
   - layer:tls-client
+  - layer:snap
   - interface:http
 options:
   tls-client:

cluster/juju/layers/kubernetes-e2e/metadata.yaml

@@ -15,15 +15,11 @@ requires:
   kubernetes-master:
     interface: http
 resources:
-  e2e_amd64:
+  kubectl:
     type: file
-    filename: e2e_amd64.tar.gz
-    description: Tarball of the e2e binary, and kubectl binary for amd64
-  e2e_ppc64el:
+    filename: kubectl.snap
+    description: kubectl snap
+  kubernetes-test:
     type: file
-    filename: e2e_ppc64le.tar.gz
-    description: Tarball of the e2e binary, and kubectl binary for ppc64le
-  e2e_s390x:
-    type: file
-    filename: e2e_s390x.tar.gz
-    description: Tarball of the e2e binary, and kubectl binary for s390x
+    filename: kubernetes-test.snap
+    description: kubernetes-test snap

cluster/juju/layers/kubernetes-e2e/reactive/kubernetes_e2e.py

@@ -17,6 +17,7 @@
 import os
 
 from charms import layer
+from charms.layer import snap
 
 from charms.reactive import hook
 from charms.reactive import is_state
@@ -37,7 +38,7 @@ from subprocess import check_output
 @hook('upgrade-charm')
 def reset_delivery_states():
     ''' Remove the state set when resources are unpacked. '''
-    remove_state('kubernetes-e2e.installed')
+    install_snaps()
 
 
 @when('kubernetes-e2e.installed')
@@ -65,52 +66,19 @@ def messaging():
     hookenv.status_set('active', 'Ready to test.')
 
 
-@when_not('kubernetes-e2e.installed')
-def install_kubernetes_e2e():
-    ''' Deliver the e2e and kubectl components from the binary resource stream
-    packages declared in the charm '''
-    charm_dir = os.getenv('CHARM_DIR')
-    arch = determine_arch()
+@when('config.changed.channel')
+def channel_changed():
+    install_snaps()
 
-    # Get the resource via resource_get
-    resource = 'e2e_{}'.format(arch)
-    try:
-        archive = hookenv.resource_get(resource)
-    except Exception:
-        message = 'Error fetching the {} resource.'.format(resource)
-        hookenv.log(message)
-        hookenv.status_set('blocked', message)
-        return
-
-    if not archive:
-        hookenv.log('Missing {} resource.'.format(resource))
-        hookenv.status_set('blocked', 'Missing {} resource.'.format(resource))
-        return
-
-    # Handle null resource publication, we check if filesize < 1mb
-    filesize = os.stat(archive).st_size
-    if filesize < 1000000:
-        hookenv.status_set('blocked',
-                           'Incomplete {} resource.'.format(resource))
-        return
-
-    hookenv.status_set('maintenance',
-                       'Unpacking {} resource.'.format(resource))
-
-    unpack_path = '{}/files/kubernetes'.format(charm_dir)
-    os.makedirs(unpack_path, exist_ok=True)
-    cmd = ['tar', 'xfvz', archive, '-C', unpack_path]
-    hookenv.log(cmd)
-    check_call(cmd)
-
-    services = ['e2e.test', 'ginkgo', 'kubectl']
-
-    for service in services:
-        unpacked = '{}/{}'.format(unpack_path, service)
-        app_path = '/usr/local/bin/{}'.format(service)
-        install = ['install', '-v', unpacked, app_path]
-        call(install)
 
+def install_snaps():
+    ''' Deliver the e2e and kubectl components from the binary resource stream
+    packages declared in the charm '''
+    channel = hookenv.config('channel')
+    hookenv.status_set('maintenance', 'Installing kubectl snap')
+    snap.install('kubectl', channel=channel, classic=True)
+    hookenv.status_set('maintenance', 'Installing kubernetes-test snap')
+    snap.install('kubernetes-test', channel=channel, classic=True)
     set_state('kubernetes-e2e.installed')