Rename install-yarn to ensure-yarn for consistency

The old role will be kept and include ensure-yarn for backwards-compatability.

Change-Id: I7631c7e588bc953d6e3b22759abe66a73ffca728

doc/source/js-roles.rst

@@ -3,6 +3,7 @@ Javascript Roles
 
 .. zuul:autorole:: ensure-javascript-packages
 .. zuul:autorole:: ensure-nodejs
+.. zuul:autorole:: ensure-yarn
 .. zuul:autorole:: fetch-javascript-content-tarball
 .. zuul:autorole:: fetch-javascript-output
 .. zuul:autorole:: fetch-javascript-tarball

playbooks/javascript/pre.yaml

@@ -1,5 +1,5 @@
 - hosts: all
   roles:
     - ensure-nodejs
-    - install-yarn
+    - ensure-yarn
     - ensure-javascript-packages

roles/ensure-yarn/README.rst

@@ -0,0 +1,13 @@
+Install yarn from yarnpkg repos
+
+**Role Variables**
+
+.. zuul:rolevar:: zuul_work_dir
+   :default: {{ zuul.project.src_dir }}
+
+   The directory to work in.
+
+.. zuul:rolevar:: yarn_lock_file_path
+   :default: {{ zuul_work_dir }}/yarn.lock
+
+   Path to yarn.lock file used by a project.

roles/ensure-yarn/tasks/main.yaml

@@ -0,0 +1,15 @@
+- name: Check for yarn.lock file
+  stat:
+    path: "{{ yarn_lock_file_path }}"
+    get_checksum: false
+    get_mime: false
+    get_md5: false
+  register: yarn_lock
+
+- name: Install yarn if needed
+  include: "{{ item }}"
+  with_first_found:
+    - "{{ ansible_distribution }}.yaml"
+    - "{{ ansible_os_family }}.yaml"
+  when:
+    - yarn_lock.stat.exists

roles/install-yarn/README.rst

@@ -1,13 +1 @@
-Install yarn from yarnpkg repos
-
-**Role Variables**
-
-.. zuul:rolevar:: zuul_work_dir
-   :default: {{ zuul.project.src_dir }}
-
-   The directory to work in.
-
-.. zuul:rolevar:: yarn_lock_file_path
-   :default: {{ zuul_work_dir }}/yarn.lock
-
-   Path to yarn.lock file used by a project.
+.. warning:: Deprecated, use ensure-yarn instead.

roles/install-yarn/tasks/main.yaml

@@ -1,15 +1,3 @@
-- name: Check for yarn.lock file
-  stat:
-    path: "{{ yarn_lock_file_path }}"
-    get_checksum: false
-    get_mime: false
-    get_md5: false
-  register: yarn_lock
-
-- name: Install yarn if needed
-  include: "{{ item }}"
-  with_first_found:
-    - "{{ ansible_distribution }}.yaml"
-    - "{{ ansible_os_family }}.yaml"
-  when:
-    - yarn_lock.stat.exists
+- name: Include ensure-yarn.
+  include_role:
+    name: ensure-yarn