Allow promoting a distribution to the publication used by another

Author: markgoddard

roles/pulp_distribution/README.md

@@ -31,13 +31,20 @@ Example playbook
       pulp_username: admin
       pulp_password: "{{ secrets_pulp_admin_password }}"
       pulp_distribution_rpm:
+        # Distribute the latest version of the centos-baseos repository.
         - name: centos-baseos
           base_path: centos-baseos
           repository: centos-baseos
           state: present
+        # Distribute version 2 of the centos-appstream repository.
         - name: centos-appstream
           base_path: centos-appstream
           repository: centos-appstream
           version: 2
           state: present
+        # Distribute the same publication as the centos-baseos distribution.
+        - name: centos-baseos-production
+          base_path: centos-baseos-production
+          distribution: centos-baseos
+          state: present
 ```

roles/pulp_distribution/tasks/rpm.yml

@@ -30,7 +30,11 @@
     specific_pub: "{{ pulp_pubs_list.publications | selectattr('repository_version', 'equalto', repo.pulp_href ~ 'versions/' ~ item.version | default ~ '/') }}"
     # If the distribution uses the latest version:
     latest_pub: "{{ pulp_pubs_list.publications | selectattr('repository', 'equalto', repo.pulp_href) | sort(attribute='repository_version', reverse=True) }}"
-    pub: "{{ latest_pub | first if item.version is not defined else specific_pub | first }}"
+    # If another distribution is being promoted to this one:
+    promoted_dist: "{{ pulp_dists_list.distributions | selectattr('name', 'equalto', item.distribution | default) }}"
+    promoted_pub: "{{ pulp_pubs_list.publications | selectattr('pulp_href', 'equalto', (promoted_dist | first).publication | default) }}"
+    # Pick the right pubication based on the type of distribution.
+    pub: "{{ specific_pub | first if item.version is defined else promoted_pub | first if item.distribution is defined else latest_pub | first }}"
     # Whether any distributions exist for this publication.
     pub_has_dists: "{{ pulp_dists_list.distributions | selectattr('publication', 'equalto', pub.pulp_href) | list | length > 0 }}"
   pulp.squeezer.rpm_distribution: