garlic: lightweight continuous integration for rails using git
This is not a CI server, use cruisecontrol.rb for that. This is a simple set
of rake tasks that let you specify a bunch of rails builds to run against, and
dependencies to install.
This is aimed at testing plugins (or apps) against multiple versions of rails,
and allows specifying other plugin dependencies (and their versions and any
Garlic works by cloning git repos for all your dependencies (so they all must be
git repos), and then using git to checkout various tags and branches to build
your app against.
Get up and running quickly
You have a plugin and you want it tested against different versions of rails?
- install garlic as a gem (see below)
- cd into your (say, rspec tested) plugin directory
garlic generate rspec > garlic.rb garlic install_repos garlic
- See what happens, edit garlic.rb to change rails versions and other stuff.
garlic --help # will probably help
Install the garlic gemsudo gem install ianwhite-garlic —source=http://gems.github.com
(if it’s not installing as a gem from github)git clone git://github.com/ianwhite/garlic cd garlic rake package sudo gem install pkg/*.gem
To see garlic in action, download response_for, a rails plugin that uses
garlic for CI.
run garlicgarlic all
This will clone all the required git repos (done only once), set up the target
railses (done once), then run the targets.
Once you’ve made some changes
You can prepare and run all the targets again (without fetching remote repos) by doinggarlic
This will prepare all the targets, using the current HEAD of the repos, and run the
CI task again.
Specifying particular targets
If you just want to run against a particular target or targets, you can use the TARGET or TARGETS
Running Shell commands across multiple targets
Check dis outgarlic shell # Example output
The following still needs to be updated for the new gem/cmd-line version
Let’s say I’m patching resources_controller.
First I grab it, and set up garlicgit clone git://github.com/ianwhite/resources_controller.git cd resources_controller rake get_garlic cp garlic_example.rb garlic.rb
- I could now edit garlic.rb to point the repos at my local copies, for speed
Now, I download and run the CI suiterake garlic:all
Now, I make some changesgit checkout -b my_change
- … commit some changes into ‘my_change’
- … everything is fine, so I can merge these into master, or send a pull request
How do I run the specs on uncommitted code?
The best way is to make the changes in one of the ‘work’ targets. For example:
- after running rake garlic:all
- … make changes without committing
- … it passes, so commit
git commit -m “My great change”
Now you can push these changes back upstream to your local ‘master’ repogit push origin my_changes # or you could push to master branch or whatever
Then cd back up there, and run rake garlic to verify your changes against the other
targets. If these all pass, you can push, or send a pull request
h2.How to add garlic to your repo (example: rails plugin)
1. require the garlic tasks into your own Rakefile
- rescue this just in case the plugin user doesn’t have garlic
2. add a garlic.rb
An example garlic.rb:garlic do
repo ‘rails’, :url => ‘git://github.com/rails/rails’
repo ‘rspec’, :url => ‘git://github.com/dchelimsky/rspec’
repo ‘rspec-rails’, :url => ‘git://github.com/dchelimsky/rspec-rails’
repo ‘resources_controller’, :path => ‘.’
target ‘2.0-stable’, :branch => ‘origin/2-0-stable’
target ‘2.0.2’, :tag => ‘v2.0.2’
3. ignore the garlic artefacts
rake garlic:all 4. Run it
And to run it again, once you’ve made changesrake garlic
To make sure you’re running against the latest repos:rake garlic:update_repos
Lend a hand
This is an early release, so there is plenty of scope for changes and improvement
If you want to lend a hand, get in touch.
© Ian White 2008 – firstname.lastname@example.org
Lent a hand
Thanks very much to:
- Pat Allan