[extended-maintenance-branches-only] Replace LVM job

the voting LVM job (manila-tempest-minimal-dsvm-lvm-centos-7)
has been failing for a while due to the issue identified
in [1]. The fix for the issues didn't suffice for CentOS,
and we use CentOS because of missing IPv6 related fixes
in Xenial's nfs-utils package. to avoid impacting helpful
backports to these branches, this commit introduces a
new voting job called "manila-tempest-dsvm-lvm-em-only"
that deploys manila with the LVM driver on Xenial and
runs IPv4 scenario tests.

[1] http://lists.openstack.org/pipermail/openstack-discuss/2020-June/015432.html
Related-Bug: #1888717
Change-Id: I4a9ae0744757d1c9bfe4f2b213eb04364992af0d
Signed-off-by: Goutham Pacha Ravi <gouthampravi@gmail.com>

.zuul.yaml

@@ -26,7 +26,11 @@
         - manila-tempest-minimal-dsvm-cephfs-nfs:
             voting: false
         - manila-tempest-minimal-dsvm-dummy
-        - manila-tempest-minimal-dsvm-lvm-centos-7
+        - manila-tempest-dsvm-lvm-em-only
+        # manila-tempest-dsvm-lvm-em-only replaces below
+        # job because of LP #1888717
+        - manila-tempest-minimal-dsvm-lvm-centos-7:
+            voting: false
         - manila-grenade:
             voting: false
         - manila-rally-multibackend:
@@ -44,7 +48,7 @@
       jobs:
         - manila-tox-genconfig
         - manila-tempest-minimal-dsvm-dummy
-        - manila-tempest-minimal-dsvm-lvm-centos-7
+        - manila-tempest-dsvm-lvm-em-only
         - openstack-tox-lower-constraints
     experimental:
       jobs:
@@ -335,6 +339,18 @@
       - openstack/python-manilaclient
       - openstack/tempest
 
+- job:
+    name: manila-tempest-dsvm-lvm-em-only
+    parent: manila-tempest-base
+    run: playbooks/legacy/manila-tempest-dsvm-lvm-em-only/run.yaml
+    post-run: playbooks/legacy/manila-tempest-dsvm-lvm-em-only/post.yaml
+    required-projects:
+      - openstack/devstack-gate
+      - openstack/manila
+      - openstack/manila-tempest-plugin
+      - openstack/python-manilaclient
+      - openstack/tempest
+
 - job:
     name: manila-tempest-minimal-dsvm-lvm-centos-7
     parent: manila-tempest-base

contrib/ci/post_test_hook.sh

@@ -196,7 +196,6 @@ if [[ "$DRIVER" == "lvm" ]]; then
     RUN_MANILA_SHRINK_TESTS=False
     RUN_MANILA_REVERT_TO_SNAPSHOT_TESTS=True
     RUN_MANILA_MOUNT_SNAPSHOT_TESTS=True
-    RUN_MANILA_IPV6_TESTS=True
     iniset $TEMPEST_CONFIG share enable_ip_rules_for_protocols 'nfs'
     iniset $TEMPEST_CONFIG share enable_user_rules_for_protocols 'cifs'
     iniset $TEMPEST_CONFIG share image_with_share_tools 'manila-service-image-master'

contrib/ci/pre_test_hook.sh

@@ -146,7 +146,6 @@ elif [[ "$DRIVER" == "lvm" ]]; then
 
     echo "SHARE_DRIVER=manila.share.drivers.lvm.LVMShareDriver" >> $localconf
     echo "SHARE_BACKING_FILE_SIZE=32000M" >> $localconf
-    export MANILA_SETUP_IPV6=True
 elif [[ "$DRIVER" == "zfsonlinux" ]]; then
     MANILA_SERVICE_IMAGE_ENABLED=True
     echo "SHARE_DRIVER=manila.share.drivers.zfsonlinux.driver.ZFSonLinuxShareDriver" >> $localconf

playbooks/legacy/manila-tempest-dsvm-lvm-em-only/post.yaml

@@ -0,0 +1,15 @@
+- hosts: primary
+  tasks:
+
+    - name: Copy files from {{ ansible_user_dir }}/workspace/ on node
+      synchronize:
+        src: '{{ ansible_user_dir }}/workspace/'
+        dest: '{{ zuul.executor.log_root }}'
+        mode: pull
+        copy_links: true
+        verify_host: true
+        rsync_opts:
+          - --include=/logs/**
+          - --include=*/
+          - --exclude=*
+          - --prune-empty-dirs

playbooks/legacy/manila-tempest-dsvm-lvm-em-only/run.yaml

@@ -0,0 +1,83 @@
+- hosts: all
+  name: manila-tempest-dsvm-lvm-em-only runs only IPv4 tests, See https://launchpad.net/bugs/1888717
+  tasks:
+    - name: Ensure legacy workspace directory
+      file:
+        path: '{{ ansible_user_dir }}/workspace'
+        state: directory
+
+    - shell:
+        cmd: |
+          set -e
+          set -x
+          cat > clonemap.yaml << EOF
+          clonemap:
+            - name: openstack/devstack-gate
+              dest: devstack-gate
+          EOF
+          /usr/zuul-env/bin/zuul-cloner -m clonemap.yaml --cache-dir /opt/git \
+              https://opendev.org \
+              openstack/devstack-gate
+        executable: /bin/bash
+        chdir: '{{ ansible_user_dir }}/workspace'
+      environment: '{{ zuul | zuul_legacy_vars }}'
+
+    - shell:
+        cmd: |
+          set -e
+          set -x
+          cat << 'EOF' >>"/tmp/dg-local.conf"
+          [[local|localrc]]
+          SKIP_EPEL_INSTALL=True
+          enable_plugin manila https://opendev.org/openstack/manila
+          enable_plugin manila-tempest-plugin https://opendev.org/openstack/manila-tempest-plugin
+          EOF
+        executable: /bin/bash
+        chdir: '{{ ansible_user_dir }}/workspace'
+      environment: '{{ zuul | zuul_legacy_vars }}'
+
+    - shell:
+        cmd: |
+          set -e
+          set -x
+          export PYTHONUNBUFFERED=true
+          export DEVSTACK_GATE_NEUTRON=1
+          export DEVSTACK_PROJECT_FROM_GIT="python-manilaclient"
+
+          export MANILA_INSTALL_TEMPEST_PLUGIN_SYSTEMWIDE=False
+          export MANILA_ALLOW_NAS_SERVER_PORTS_ON_HOST=True
+
+          # Keep localrc to be able to set some vars in pre_test_hook
+          export KEEP_LOCALRC=1
+          export ENABLED_SERVICES=tempest
+          export PROJECTS="openstack/manila-tempest-plugin $PROJECTS"
+
+          function pre_test_hook {
+              # 'dhss' - acronym for 'Driver Handles Share Servers',
+              # defines mode of a share driver. Boolean-like.
+              # 'driver' - codename of a share driver to configure.
+              # 'back_end_type' - defines which installation Manila should
+              # have - either 'singlebackend' or 'multibackend'.
+              source $BASE/new/manila/contrib/ci/pre_test_hook.sh False lvm multibackend
+          }
+          export -f pre_test_hook
+
+          function post_test_hook {
+              # 'back_end_type' - defines which installation Manila is
+              # configured to - either 'singlebackend' or 'multibackend'.
+              # 'driver' - codename of a share driver that is configured in
+              # Manila. It is used for enabling/disabling tests that are not
+              # supported by share driver that is used.
+              # 'test_type' - defines which set of test suites should be used,
+              # can have 'api' and 'scenario' values.
+              # 'postgres_enabled' - set of test suites depends on DB backend
+              # in some cases, so it is provided explicitely. Boolean-like.
+              source $BASE/new/manila/contrib/ci/post_test_hook.sh multibackend lvm api False
+          }
+          export -f post_test_hook
+
+          cp devstack-gate/devstack-vm-gate-wrap.sh ./safe-devstack-vm-gate-wrap.sh
+          ./safe-devstack-vm-gate-wrap.sh
+        executable: /bin/bash
+        chdir: '{{ ansible_user_dir }}/workspace'
+      environment: '{{ zuul | zuul_legacy_vars }}'