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Rake task for Github comparison

“What’s going to production?”

“Can I deploy the current master?”

“What the hell is going on here?”

Sounds familiar? Why not just have a rake task that could tell you?

namespace :git do
  task :compare do
    server = ENV['SERVER']
    server ||= 'beerclub'

    git_commit = `heroku releases -a #{server} | grep 'Deploy' | sort | tail -1 | cut -d ' ' -f 4`.chomp
    if $CHILD_STATUS.success?
      `open "https://github.com/omegahm/beerclub/compare/#{git_commit}...master?w=1"`
    else
      puts "Couldn't get git commit for #{server}."
    end
  end
end

The above rake task will look for the server passed via ENV['SERVER'] (or use a default) and grab the last deploy status from it’s Heroku releases. It’ll then open the default browser with the compare url from Github, showing you all the files and commits that have been made between last deploy and current master.

The above can be run with

bundle exec rake git:compare

EDIT:

Note that we do not need to inherit environment in the Rake task, because we actually do not do anything with the app.

This means that the rake task could just as easily have been a bash script:

#!/usr/bin/env bash
if [ -z $SERVER ]
then
  SERVER='beerclub'
fi

GIT_COMMIT=`heroku releases -a $SERVER | grep 'Deploy' | sort | tail -1 | cut -d ' ' -f 10`

if [ -z $GIT_COMMIT ]
then
  echo "Couldn't get git commit for $SERVER."
else
  `open "https://github.com/omegahm/beerclub/compare/$GIT_COMMIT...master?w=1"`
fi