Simple script to delete old builds from Jenkins. Deletes all but the newest 50 builds.

delete_old_builds

#!/usr/bin/env ruby

require "net/http"
require "uri"
require "json"

ENDPOINT = ARGV[0]
SUFFIX    = "api/json"
JOBS_TO_KEEP = 50

def make_request(path)
  uri = URI.parse(File.join(path, SUFFIX))
  JSON.parse(Net::HTTP.get_response(uri).body)
end

def jobs
  make_request(ENDPOINT)["jobs"]
end

def builds_to_delete(job)
  return [] unless job["firstBuild"] && job["lastBuild"]
  first = job["firstBuild"]["number"]
  last = job["lastBuild"]["number"]
  (first..(last-JOBS_TO_KEEP)).to_a
end

def delete_build(job, build_number)
  uri = URI.parse(File.join(job["url"], build_number, "doDelete"))
  puts "deleting: #{uri}"
  http = Net::HTTP.new(uri.host, uri.port)
  request = Net::HTTP::Post.new(uri.request_uri)
  http.request(request)
end

jobs.each do |job|
  puts job["name"]
  job = make_request(job["url"])
  builds_to_delete(job).each do |build_number|
    delete_build(job, build_number.to_s)
  end
end