[stable-only] gate: Pin CEPH_RELEASE to nautilus in LM hook20.6.0

I1edd5a50079f325fa143a7e0d51b3aa3bb5ed45d moved the branchless
devstack-plugin-ceph project to the Octopus release of Ceph that drops
support for py2. As this was still the default on stable/train this
breaks the nova-live-migration and nova-grenade jobs.

This change works around this by pinning the CEPH_RELEASE to nautilus
within the LM hook as was previously used prior to the above landing.

Note that the devstack-plugin-ceph-tempest job from the plugin repo
continues to pass as it is correctly pinned to the Luminous release that
supports py2.

If anything the above enforces the need to move away from these hook
scripts and instead inherit our base ceph jobs from this repo in the
future to avoid the Ceph release jumping around like this.

Change-Id: I1d029ebe78b16ed2d4345201b515baf3701533d5

2 files changed, 6 insertions, 0 deletions

diff --git a/gate/live_migration/hooks/ceph.sh b/gate/live_migration/hooks/ceph.sh
index 483f92b0e1..c588f7c9b2 100755
--- a/gate/live_migration/hooks/ceph.sh
+++ b/gate/live_migration/hooks/ceph.sh
@@ -8,6 +8,7 @@ function prepare_ceph {
     configure_ceph
     #install ceph-common package on compute nodes
     $ANSIBLE subnodes --become -f 5 -i "$WORKSPACE/inventory" -m raw -a "executable=/bin/bash
+    export CEPH_RELEASE=nautilus
     source $BASE/new/devstack/functions
     source $BASE/new/devstack/functions-common
     git clone https://opendev.org/openstack/devstack-plugin-ceph /tmp/devstack-plugin-ceph
diff --git a/gate/live_migration/hooks/run_tests.sh b/gate/live_migration/hooks/run_tests.sh
index 00ad341634..7a5027f2c9 100755
--- a/gate/live_migration/hooks/run_tests.sh
+++ b/gate/live_migration/hooks/run_tests.sh
@@ -55,6 +55,11 @@ fi
 echo '4. test with Ceph for root + ephemeral disks'
 # Discover and set variables for the OS version so the devstack-plugin-ceph
 # scripts can find the correct repository to install the ceph packages.
+# NOTE(lyarwood): Pin the CEPH_RELEASE to nautilus here as was the case
+# prior to https://review.opendev.org/c/openstack/devstack-plugin-ceph/+/777232
+# landing in the branchless plugin, we also have to pin in ceph.sh when
+# configuring ceph on a remote node via ansible.
+export CEPH_RELEASE=nautilus
 GetOSVersion
 prepare_ceph
 GLANCE_API_CONF=${GLANCE_API_CONF:-/etc/glance/glance-api.conf}