Update to classic charms to build using charmcraft in CI

This update is to ensure that the Zuul Canonical CI builds the charm
before functional tests and ensure that that artifact is used for the
functional tests.  This is to try to ensure that the charm that gets
landed to the charmhub is the same charm that was tested with.

Change-Id: I3cb1f519e8f1d6765b41751994633be73e5bdea5

.gitignore

@@ -6,6 +6,7 @@ revision
 .testrepository
 *.sw[nop]
 *.pyc
+*.charm
 __pycache__/
 .project
 .pydevproject

build-requirements.txt

@@ -0,0 +1,7 @@
+# NOTES(lourot):
+# * We don't install charmcraft via pip anymore because it anyway spins up a
+#   container and scp the system's charmcraft snap inside it. So the charmcraft
+#   snap is necessary on the system anyway.
+# * `tox -e build` successfully validated with charmcraft 1.2.1
+
+cffi==1.14.6; python_version < '3.6'  # cffi 1.15.0 drops support for py35.

osci.yaml

@@ -4,4 +4,7 @@
       - charm-unit-jobs-py39
       - charm-xena-functional-jobs
       - charm-yoga-functional-jobs
-
+    vars:
+      needs_charm_build: true
+      charm_build_name: rabbitmq-server
+      build_type: charmcraft

rename.sh

@@ -0,0 +1,13 @@
+#!/bin/bash
+charm=$(grep "charm_build_name" osci.yaml | awk '{print $2}')
+echo "renaming ${charm}_*.charm to ${charm}.charm"
+echo -n "pwd: "
+pwd
+ls -al
+echo "Removing bad downloaded charm maybe?"
+if [[ -e "${charm}.charm" ]];
+then
+    rm "${charm}.charm"
+fi
+echo "Renaming charm here."
+mv ${charm}_*.charm ${charm}.charm

tests/bundles/focal-xena.yaml

@@ -42,7 +42,7 @@ applications:
     channel: latest/edge
 
   rabbitmq-server:
-    charm: "../../../rabbitmq-server"
+    charm: ../../rabbitmq-server.charm
     num_units: 3
     constraints:
       cpu-cores=2

tests/bundles/focal-yoga.yaml

@@ -42,7 +42,7 @@ applications:
     channel: latest/edge
 
   rabbitmq-server:
-    charm: "../../../rabbitmq-server"
+    charm: ../../rabbitmq-server.charm
     num_units: 3
     constraints:
       cpu-cores=2

tests/bundles/impish-xena.yaml

@@ -42,7 +42,7 @@ applications:
     channel: latest/edge
 
   rabbitmq-server:
-    charm: "../../../rabbitmq-server"
+    charm: ../../rabbitmq-server.charm
     num_units: 3
     constraints:
       cpu-cores=2

tests/bundles/jammy-yoga.yaml

@@ -42,7 +42,7 @@ applications:
     channel: latest/edge
 
   rabbitmq-server:
-    charm: "../../../rabbitmq-server"
+    charm: ../../rabbitmq-server.charm
     num_units: 3
     constraints:
       cpu-cores=2

tox.ini

@@ -37,10 +37,20 @@ setenv = VIRTUAL_ENV={envdir}
 install_command =
   {toxinidir}/pip.sh install {opts} {packages}
 commands = stestr run --slowest {posargs}
-allowlist_externals = juju
+allowlist_externals =
+    charmcraft
+    rename.sh
 passenv = HOME TERM CS_* OS_* TEST_*
 deps = -r{toxinidir}/test-requirements.txt
 
+[testenv:build]
+basepython = python3
+deps = -r{toxinidir}/build-requirements.txt
+commands =
+    charmcraft clean
+    charmcraft -v build
+    {toxinidir}/rename.sh
+
 [testenv:py35]
 basepython = python3.5
 deps = -r{toxinidir}/requirements.txt