Gitlab: Auto-Close all empty stale Merge-Requests

gitlab_auto_close_mrs.rb

# Auto-Close all open MR's that:
# - are created before 3 months
# - have NO changes (no commits pushed)
# - has a issue attached that is already closed
#
# Background: Gitlab makes it easy to create a MR for a issue via button. 
# But sometimes that branch becomes stale and the issue will be moved/fixed differently
#
# Afterwards, also triggers a Remove Merged Branches Job
# DANGER: Use on your own discretion

require 'bundler/inline'
gemfile do
  source 'https://rubygems.org'
  gem 'gitlab'
end

require 'gitlab'

Gitlab.endpoint = URL
Gitlab.private_token = TOKEN
min_age = 3.months.ago.to_date

my_mr = Gitlab.user_merge_requests(state: :opened, scope: :all, created_before: min_age.to_s).auto_paginate

projects_with_changes = []

my_mr.each do |mr|
  skip_reasons = []
  changes_count = Gitlab.merge_request(mr.project_id, mr.iid).as_json['changes_count']
  if changes_count != nil
    skip_reasons << "Has Changes attached #{changes_count}"
  end

  issues = Gitlab.merge_request_closes_issues(mr.project_id, mr.iid)
  if issues.count == 0
    skip_reasons << "No Issues referenced"
  end
  unless issues.all? { |i| i.state == 'closed'}
    skip_reasons << "Has unclosed issues"
  end

  if skip_reasons.any?
    puts "SKIPPING #{mr.web_url} - #{skip_reasons.join(' | ')}"
    next
  end

  puts "CLOSING #{mr.web_url}"
  Gitlab.update_merge_request(mr.project_id, mr.iid, state_event: 'close')
  projects_with_changes << mr.project_id
rescue Gitlab::Error::Forbidden => e
  puts "ERROR: Cannot access gitlab: #{e}"
end

projects_with_changes.each do |project_id|
  Gitlab.delete_merged_branches(project_id)
end