Jenkins pull request receiver

jenkins-and-pull request

#!/usr/bin/env ruby

# when jenkins received the post  payload from github 
# clone the repository, and try to merge the pull request before build.
# jenkins must be configured as parametrized one with "payload" parameter.


require 'rubygems'
require 'json'


payload = JSON.parse(ENV['payload'])
job_name = ENV['JOB_NAME']
#puts JSON.pretty_generate(payload)

pull_request_id = payload["number"]

base_git_url = payload["pull_request"]["base"]["repo"]["git_url"]
base_ref = payload["pull_request"]["base"]["ref"]
#base_repo_name = payload["pull_request"]["base"]["repo"]["name"]

#tmp_repo = "/tmp/#{base_repo_name}-#{pull_request_id}"
tmp_repo = "/tmp/#{job_name}"


`rm -rf #{tmp_repo}`
Dir.chdir "/tmp"

`git clone #{base_git_url} #{tmp_repo}`
# switching to  base ref
 
Dir.chdir "#{tmp_repo}"
`git checkout #{base_ref}`

# fetch the pull request
`git fetch origin +refs/pull/#{pull_request_id}/head`

if (payload["pull_request"]["mergeable"])
  # merge it
  puts "The pull request is mergeable : merging ..."
  `git merge FETCH_HEAD`
else
  puts "The pull request is not mergeable : running in detached mode"
  `git checkout -qf FETCH_HEAD`
end