Split reno installation into a role

Similar to ensure-tox, split installing reno in to its own role.

Change-Id: I8ac7c40f1fe8b590c4184437bf50a7c03cf2b45f

playbooks/releasenotes/run.yaml

@@ -1,3 +1,4 @@
 - hosts: all
   roles:
+    - ensure-reno
     - build-releasenotes

roles/build-releasenotes/tasks/main.yaml

@@ -1,52 +1,9 @@
-- name: Install gettext package
-  package:
-    name: gettext
-    state: present
-  become: yes
-
 # TODO(mordred) Put the translations logic into a sphinx plugin?
 - name: Check if translations exist for release notes
   stat:
     path: "{{ zuul_work_dir }}/releasenotes/source/locale"
   register: translations
 
-- name: Check to see if the constraints file exists
-  stat:
-    path: "{{ constraints_file|default('missing') }}"
-    get_checksum: false
-    get_mime: false
-    get_md5: false
-  register: stat_results
-  when: constraints_file is defined
-
-- name: Record file location
-  set_fact:
-    upper_constraints: "-c {{ constraints_file }}"
-  when: not stat_results|skipped and stat_results.stat.exists
-
-- name: Setup venv
-  shell:
-    chdir: '{{ zuul_work_dir }}'
-    executable: /bin/bash
-    cmd: |
-      set -e
-      set -x
-
-      UPPER_CONSTRAINTS="{{ upper_constraints }}"
-      python -m virtualenv .venv
-      VENV=.venv/bin
-      $VENV/pip install sphinx $UPPER_CONSTRAINTS
-      $VENV/pip install openstackdocstheme $UPPER_CONSTRAINTS
-      $VENV/pip install reno $UPPER_CONSTRAINTS
-      # Optionally, install local requirements
-      if [ -e releasenotes/requirements.txt ] ; then
-          $VENV/pip install -r releasenotes/requirements.txt $UPPER_CONSTRAINTS
-      fi
-      # TODO(jaegerandi): Remove once all repos are fixed.
-      # Try installing current repo in case it needs to be available for
-      # example for version number calculation. Ignore any failures here.
-      $VENV/pip install . || true
-
 - name: Prepare release note translations
   shell:
     chdir: '{{ zuul_work_dir }}'

roles/ensure-reno/README.rst

@@ -0,0 +1,10 @@
+Ensure reno is installed
+
+**Role Variables**
+
+.. zuul:rolevar:: zuul_work_dir
+   :default: {{ zuul.project.src_dir }}
+
+   Directory to operate in. Needed only for a little while until we have
+   projects migrated to not need to be installed just to generate
+   release notes.

roles/ensure-reno/defaults/main.yaml

@@ -0,0 +1 @@
+zuul_work_dir: "{{ zuul.project.src_dir }}"

roles/ensure-reno/tasks/main.yaml

@@ -0,0 +1,42 @@
+- name: Install gettext package
+  package:
+    name: gettext
+    state: present
+  become: yes
+
+- name: Check to see if the constraints file exists
+  stat:
+    path: "{{ constraints_file|default('missing') }}"
+    get_checksum: false
+    get_mime: false
+    get_md5: false
+  register: stat_results
+  when: constraints_file is defined
+
+- name: Record file location
+  set_fact:
+    upper_constraints: "-c {{ constraints_file }}"
+  when: not stat_results|skipped and stat_results.stat.exists
+
+- name: Setup venv
+  shell:
+    chdir: '{{ zuul_work_dir }}'
+    executable: /bin/bash
+    cmd: |
+      set -e
+      set -x
+
+      UPPER_CONSTRAINTS="{{ upper_constraints }}"
+      python -m virtualenv .venv
+      VENV=.venv/bin
+      $VENV/pip install sphinx $UPPER_CONSTRAINTS
+      $VENV/pip install openstackdocstheme $UPPER_CONSTRAINTS
+      $VENV/pip install reno $UPPER_CONSTRAINTS
+      # Optionally, install local requirements
+      if [ -e releasenotes/requirements.txt ] ; then
+          $VENV/pip install -r releasenotes/requirements.txt $UPPER_CONSTRAINTS
+      fi
+      # TODO(jaegerandi): Remove once all repos are fixed.
+      # Try installing current repo in case it needs to be available for
+      # example for version number calculation. Ignore any failures here.
+      $VENV/pip install . || true