update_repo to limit to packages in repo

Rather than updating every package, allow to limit to a single repo

README.md

@@ -21,6 +21,8 @@ A role to allow modification to container images built for the TripleO project.
 | `source_image` | `[undefined]` | See modify image variables |
 | `modified_append_tag` | `date +-modified-%Y%m%d%H%M%S` | See modify image variables |
 | `target_image` | `''` | See modify image variables |
+| `update_repo` | `''` | If set, packages from this repo will be updated. Other
+repos will only be used for dependencies of these updates.|
 | `yum_repos_dir_path` | `None` | Optional path of directory to be used as `/etc/yum.repos.d` during the update |
 | `compare_host_packages` | `False` | If `True`, skip yum update when package versions match host package versions |
 

defaults/main.yml

@@ -1 +1,2 @@
 compare_host_packages: false
+update_repo: ''

files/yum_update.sh

@@ -8,5 +8,11 @@ if [ -f /tmp/host_packages.json ]; then
         exit
     fi
 fi
-yum -y update
+
+packages_for_update=
+if [ -n "$1" ]; then
+    packages_for_update=("$(repoquery --disablerepo='*' --enablerepo=$1 --qf %{NAME} -a)")
+fi
+
+yum -y update $packages_for_update
 rm -rf /var/cache/yum

templates/Dockerfile.j2

@@ -15,6 +15,6 @@ COPY repos /
 COPY host_packages.json /tmp/
 {% endif %}
 
-RUN /tmp/yum_update.sh
+RUN /tmp/yum_update.sh "{{ update_repo }}"
 
 USER "{{ original_user }}"