Build Time Templates

One feature of Warbler is the inclusion of ERB (or other) templates, which get processed at the time that thewarble command is run. This allows you to bundle a variety of information along with your application, which is especially useful for remote debugging/monitoring/sanity-checking.

To take advantage of these Templates, you can create a template file (e.g.config/templates/env_vars.rb):

ENV['MYPROJECT_GIT_SHA']    = '<%= `git rev-parse HEAD`.strip %>'
ENV['MYPROJECT_GIT_BRANCH'] = '<%= `git rev-parse --abbrev-ref HEAD`.strip %>'
ENV['MYPROJECT_BUILT_AT']   = '<%= Time.now.to_s %>'
ENV['RACK_ENV']           ||= 'qa'

In your config/warble.rb file, simply include the line:

config.init_contents << "config/templates/env_vars.erb"

The erb file extension will be detected by Warbler, and it will be run through ERB. Any other file extension will be read in as a raw file.