Create a new container build job with Buildah on centos7

This job will run in Stein and beyond, where we replace Docker by
Buildah to build images.

blueprint podman-support
Depends-On: I7608136cb213bdca81348a0c3c751b488f48d712
Change-Id: Ia43d96326fdcc9629696c972df1cf677cd69c87f

playbooks/tripleo-buildcontainers/defaults/main.yaml

@@ -1,3 +1,4 @@
 push_registry: "127.0.0.1:8787"
 push_tag: "latest"
 push_containers: "false"
+use_buildah: false

playbooks/tripleo-buildcontainers/post.yaml

@@ -13,11 +13,14 @@
         mkdir -p {{ workspace }}/conf/
         mkdir -p {{ workspace }}/logs/system
         mkdir -p {{ workspace }}/etc/docker
+        mkdir -p {{ workspace }}/logs/buildah-builds
 
         mv *.conf {{ workspace }}/conf/
         mv *.log {{ workspace }}/logs/
+        mv /tmp/kolla-* {{ workspace }}/logs/buildah-builds/ || true
         rsync -var --no-links /var/log/ {{ workspace }}/logs/system/ || true
         rsync -var --no-links /etc/docker/ {{ workspace }}/etc/docker/ || true
+        rsync -var --no-links /etc/containers/ {{ workspace }}/etc/containers/ || true
         gzip -r "{{ workspace }}/logs"  "{{ workspace }}/conf" "{{ workspace }}/etc"
         chmod -R a+r "{{ workspace }}"
         chown -R {{ ansible_user }}: "{{ workspace }}"

playbooks/tripleo-buildcontainers/pre.yaml

@@ -43,6 +43,23 @@
         - name: Reset connection because of group changes for current user
           meta: reset_connection
 
+        - name: Prepare Buildah
+          become: true
+          when: use_buildah | default(false) | bool
+          block:
+            - name: Install Buildah
+              package:
+                name: buildah
+                state: present
+
+            - name: Configure insecure registry
+              ini_file:
+                path: /etc/containers/registries.conf
+                section: 'registries.insecure'
+                option: registries
+                value:
+                  - localhost:8787
+
     - name: Setup repo web service
       become: true
       block:

playbooks/tripleo-buildcontainers/run.yaml

@@ -51,11 +51,13 @@
         chdir: '{{ workspace }}'
       shell: |
         set -x
+        BUILDAH=""
         source {{ workspace }}/venv/bin/activate
         TRIPLEO_COMMON_PATH="{{ openstack_git_root }}/tripleo-common"
 
+        if [[ "{{ use_buildah | default(False) }}" == "True" ]]; then BUILDAH="--use-buildah"; fi
         openstack overcloud container image build \
             --config-file $TRIPLEO_COMMON_PATH/container-images/overcloud_containers.yaml \
-            --kolla-config-file {{ workspace }}/kolla-build.conf > {{ workspace }}/build.log 2> {{ workspace }}/build-err.log
+            --kolla-config-file {{ workspace }}/kolla-build.conf $BUILDAH > {{ workspace }}/build.log 2> {{ workspace }}/build-err.log
         RESULT=$?
         exit $RESULT

zuul.d/build-containers.yaml

@@ -7,6 +7,7 @@
     check:
       jobs:
         - tripleo-build-containers-centos-7
+        - tripleo-build-containers-centos-7-buildah
     gate:
       queue: tripleo
       jobs:
@@ -17,3 +18,11 @@
     parent: tripleo-build-containers-base-with-files
     nodeset: single-centos-7-node
     voting: true
+
+- job:
+    name: tripleo-build-containers-centos-7-buildah
+    parent: tripleo-build-containers-base-with-files
+    nodeset: single-centos-7-node
+    branches: ^(?!stable/(pike|queens|rocky)).*$
+    vars:
+      use_buildah: true