Extract updated rpms from buildah images

When a gating, component or delorean current repo
is present, containers should be updated with
the latest rpms.

This review checks the installed rpms and
greps for the repos where the updated rpms
are sourced.

Change-Id: Ie29c7c33c8d66bc3729c03c2d72cbdbf85ad443a

tasks/yum_update_buildah.yml

@@ -155,6 +155,25 @@
     path: "{{ yum_update.path }}"
     state: absent
 
+- name: Create the repo list
+  set_fact:
+    repo_list: "{{ update_repo.split(',') }}"
+
+- name: Capture the update repos and installed rpms
+  shell: >
+    buildah run {{ from_image }} yum list installed > /var/log/container_info.log
+  register: rpm_list
+
+- name: Extract the updated rpms
+  shell: |
+    UPDATE_LOG=/var/log/container_image_update_output.log;
+    touch $UPDATE_LOG;
+    echo "** {{ target_image | default(source_image) }}{{ modified_append_tag }} **" >> $UPDATE_LOG;
+    {% for repo in repo_list %}
+    cat /var/log/container_info.log | grep -F "@{{ repo|replace(' ', '') }}" >> $UPDATE_LOG || true;
+    {% endfor %}
+    rm -f /var/log/container_info.log
+
 # NOTE(aschultz): remove --format docker when oci images are properly supported
 - name: Commit changes to image
         ({{ target_image | default(source_image) }}{{ modified_append_tag }})