Automatically update the release notes changelog on tag push

    - tools/deploy-rubygem.sh

  only:

    - tags

release:

  stage: deploy

  script:

    - tools/update-changelog.rb "${CI_COMMIT_TAG}"

  only:

    - tags

#!/usr/bin/env ruby

require "uri"

require "net/http"

require "openssl"

require "json"

require "optparse"

GitlabError = Class.new(StandardError)

GitlabClientError = Class.new(GitlabError)

def gitlab_client(path, method, body = nil)

  url = URI("https://gitlab.com#{path}")

  http = Net::HTTP.new(url.host, url.port)

  http.use_ssl = true

  request = case method

            when :get

              Net::HTTP::Get.new(url)

            when :post

              Net::HTTP::Post.new(url)

            when :put

              Net::HTTP::Put.new(url)

            else

              raise "Unknown method: #{method}"

            end

  request["content-type"] = "application/json"

  request["PRIVATE-TOKEN"] = ENV["GITLAB_TOKEN"]

  request.body = JSON.dump(body) if body

  response = http.request(request)

  case response

  when Net::HTTPSuccess

    JSON.parse(response.read_body)

  when Net::HTTPClientError

    raise GitlabClientError, "HTTP #{response.code} for #{method} #{url}: #{response.read_body}"

  else

    raise GitLabError, "HTTP #{response.code} for #{method} #{url}: #{response.read_body}"

  end

end

def list_commits_for_tag(tag)

  commits = %x[git rev-list --no-merges $(git describe --tags --abbrev=0 #{tag}^)..#{tag}].lines

  commits.map(&:chomp)

end

def get_mrs_for_commit(commit_id)

  gitlab_client("/api/v4/projects/gitlab-org%2flabkit-ruby/repository/commits/#{commit_id}/merge_requests", :get)

end

def create_release_for_tag(tag, description)

  req_body = { tag_name: tag, description: description }

  gitlab_client("/api/v4/projects/gitlab-org%2flabkit-ruby/releases", :post, req_body)

end

def update_release_for_tag(tag, description)

  req_body = { description: description }

  gitlab_client("/api/v4/projects/gitlab-org%2flabkit-ruby/releases/#{tag}", :put, req_body)

end

def get_unique_mrs_for_tag(tag)

  commit_ids = list_commits_for_tag(tag)

  dup_mrs = commit_ids.map { |commit_id| get_mrs_for_commit(commit_id) }.flatten

  uniq_mrs = dup_mrs.uniq { |mr| mr["iid"] }

  uniq_mrs.sort { |mr| mr["iid"] }.reverse

end

options = {}

OptionParser.new do |opts|

  opts.banner = "Usage: update-changelog.rb [options] tag"

  opts.on("-d", "--[no-]dry-run", "Display only. Do not update release notes.") do |d|

    options[:dry_run] = d

  end

end.parse!

# Check required conditions

unless ARGV.length == 1

  puts optparse

  exit(-1)

end

tag = ARGV.first

changelog = get_unique_mrs_for_tag(tag).map { |mr| "* #{mr["web_url"]}: #{mr["title"]}" }.join("\n")

if changelog.empty?

  raise "No new changes found"

end

changelog = "## Changes in #{tag}\n\n" + changelog

if options[:dry_run]

  puts changelog

  exit

end

begin

  create_release_for_tag(tag, changelog)

  puts "Created release: https://gitlab.com/gitlab-org/labkit-ruby/-/releases##{tag}"

rescue GitlabClientError

  update_release_for_tag(tag, changelog)

  puts "Updated release: https://gitlab.com/gitlab-org/labkit-ruby/-/releases##{tag}"

end