Enable running on Debian Bullseye

Some adaption in database handling is all that is missing. Also add a
platform job that tests this.

Co-Authored-By: Radosław Piliszek <radoslaw.piliszek@gmail.com>
Change-Id: I6dd3e48444dd415d84df5e7f5c74540847cdd6db

.zuul.yaml

@@ -86,6 +86,16 @@
         nodes:
           - controller
 
+- nodeset:
+    name: devstack-single-node-debian-bullseye
+    nodes:
+      - name: controller
+        label: debian-bullseye
+    groups:
+      - name: tempest
+        nodes:
+          - controller
+
 - nodeset:
     name: openstack-two-node
     nodes:
@@ -613,6 +623,49 @@
     vars:
       configure_swap_size: 4096
 
+- job:
+    name: devstack-platform-debian-bullseye
+    parent: tempest-full-py3
+    description: Debian Bullseye platform test
+    nodeset: devstack-single-node-debian-bullseye
+    voting: false
+    timeout: 9000
+    vars:
+      # NOTE(yoctozepto): With concurrency equal 2, there is a random event
+      # that this job will run out of memory at some point.
+      tempest_concurrency: 1
+      # NOTE(yoctozepto): Debian Bullseye does not yet offer OVN. Switch to OVS
+      # for the time being.
+      devstack_localrc:
+        Q_AGENT: openvswitch
+        Q_ML2_PLUGIN_MECHANISM_DRIVERS: openvswitch
+        Q_ML2_TENANT_NETWORK_TYPE: vxlan
+      devstack_services:
+        # Disable OVN services
+        ovn-northd: false
+        ovn-controller: false
+        ovs-vswitchd: false
+        ovsdb-server: false
+        # Disable Neutron ML2/OVN services
+        q-ovn-metadata-agent: false
+        # Enable Neutron ML2/OVS services
+        q-agt: true
+        q-dhcp: true
+        q-l3: true
+        q-meta: true
+        q-metering: true
+    group-vars:
+      subnode:
+        devstack_services:
+          # Disable OVN services
+          ovn-controller: false
+          ovs-vswitchd: false
+          ovsdb-server: false
+          # Disable Neutron ML2/OVN services
+          q-ovn-metadata-agent: false
+          # Enable Neutron ML2/OVS services
+          q-agt: true
+
 - job:
     name: devstack-no-tls-proxy
     parent: tempest-full-py3
@@ -716,6 +769,7 @@
         - devstack-enforce-scope
         - devstack-platform-fedora-latest
         - devstack-platform-centos-8-stream
+        - devstack-platform-debian-bullseye
         - devstack-multinode
         - devstack-unit-tests
         - openstack-tox-bashate

lib/databases/mysql

@@ -25,6 +25,8 @@ if [[ -z "$MYSQL_SERVICE_NAME" ]]; then
         # provide a mysql.service symlink for backwards-compatibility, but
         # let's not rely on that.
         MYSQL_SERVICE_NAME=mariadb
+    elif [[ "$DISTRO" == "bullseye" ]]; then
+        MYSQL_SERVICE_NAME=mariadb
     fi
 fi
 
@@ -105,7 +107,7 @@ function configure_database_mysql {
     # In mariadb e.g. on Ubuntu socket plugin is used for authentication
     # as root so it works only as sudo. To restore old "mysql like" behaviour,
     # we need to change auth plugin for root user
-    if is_ubuntu && [ "$MYSQL_SERVICE_NAME" == "mariadb" ]; then
+    if is_ubuntu && [[ "$DISTRO" != "bullseye" ]] && [ "$MYSQL_SERVICE_NAME" == "mariadb" ]; then
         sudo mysql $cmd_args -e "UPDATE mysql.user SET plugin='' WHERE user='$DATABASE_USER' AND host='localhost';"
         sudo mysql $cmd_args -e "FLUSH PRIVILEGES;"
     fi

stack.sh

@@ -227,7 +227,7 @@ write_devstack_version
 
 # Warn users who aren't on an explicitly supported distro, but allow them to
 # override check and attempt installation with ``FORCE=yes ./stack``
-SUPPORTED_DISTROS="focal|f34|opensuse-15.2|opensuse-tumbleweed|rhel8"
+SUPPORTED_DISTROS="bullseye|focal|f34|opensuse-15.2|opensuse-tumbleweed|rhel8"
 
 if [[ ! ${DISTRO} =~ $SUPPORTED_DISTROS ]]; then
     echo "WARNING: this script has not been tested on $DISTRO"