Add the ability to delete a ruby version

README.md

@@ -25,6 +25,10 @@ rvm1_group: 'rvm'
 rvm1_rubies:
   - 'ruby-2.1.2'
 
+# Which version of ruby do you want to delete?
+# Example: `rvm1_delete_ruby: ruby-2.1.0`
+rvm1_delete_ruby: ''
+
 # Where should the rvm-installer and other temp files be downloaded to?
 rvm1_temp_download_path: '/usr/local/src'
 
@@ -76,6 +80,28 @@ You will likely want to use various ruby related commands in other roles. This r
 
 If you wanted to run a database migration in rails you would use `{{ rvm1_rake }} db:migrate`.
 
+## Upgrading and removing old versions of ruby
+
+A common work flow for upgrading your ruby version would be:
+
+1. Install the new version
+2. Run your application role so that bundle install re-installs your gems
+3. Delete the previous version of ruby
+
+You can delete a version of ruby with this role in 1 of 2 ways:
+
+### Edit your inventory directly
+
+You could overwrite `rvm1_delete_ruby: 'ruby-2.1.0'` and then run your play book. This would work but then you would have to go back and edit your inventory to make it an empty string afterwards.
+
+The delete task is idempotent but it still requires you to make 2 edits.
+
+#### Leverage ansible's `--extra-vars`
+
+Just add `--extra-vars 'rvm1_delete_ruby=ruby-2.1.0'` to the end of your play book command and that version will be removed without having to manually edit your inventory.
+
+Not having to edit anything sure sounds better to me.
+
 ## Example playbook
 
 For the sake of this example let's assume you have a group called **app** and you have a typical `site.yml` file.

defaults/main.yml

@@ -5,6 +5,8 @@ rvm1_group: 'rvm'
 rvm1_rubies:
   - 'ruby-2.1.2'
 
+rvm1_delete_ruby:
+
 rvm1_temp_download_path: '/usr/local/src'
 rvm1_install_path: '/usr/local/rvm'
 

tasks/rubies.yml

@@ -23,3 +23,15 @@
 
 - name: ensure rvm install path is writable by the set owner:group
   file: path='{{ rvm1_install_path }}' state=directory recurse=yes owner='{{ rvm1_user }}' group='{{ rvm1_group }}'
+
+- name: detect if ruby version can be deleted
+  command: '{{ rvm1 }} {{ rvm1_delete_ruby }} do true'
+  changed_when: false
+  failed_when: false
+  register: detect_delete_ruby
+  when: rvm1_delete_ruby
+
+- name: ensure ruby version is deleted
+  command: '{{ rvm1 }} remove {{ rvm1_delete_ruby }}'
+  changed_when: false
+  when: rvm1_delete_ruby and detect_delete_ruby.rc == 0