Quickly gather news about the cookbooks locked in your Berksfile.lock

example session.md

$ rake -T
rake news:all                  # cookbook news for all cookbooks
rake news:community            # new versions of community cookbooks
rake news:elasticsearch        # new versions of cookbook elasticsearch
rake news:ntp                  # new versions of cookbook ntp
rake news:osops-utils          # upstream changes for cookbook osops-utils in rcbops-cookbooks/osops-utils
$ rake news:ntp  # no news
$ rake news:elasticsearch
https://community.opscode.com/cookbooks/elasticsearch : 0.3.3, 0.3.2
$ rake news:osops-utils
open https://github.com/rcbops-cookbooks/osops-utils/compare/6b53b1839bdf588d77083191ef266add6c7acba5...master

Rakefile

require 'octokit'
require 'json'
require 'open-uri'
#require 'pp'

# NB
# - get_master_sha fails with some forked repositories
#   (it returns the SHA of the forked-off repo (?!) and the repo is thus recognized as having news)

$open = "open" # xdg-open, sensible-browser, ...

def uri_to_gh(uri)
  [
    /^https:\/\/(www\.)*github\.com\/(?<owner>[\w-]+)\/(?<repo>[\w-]+)\.git$/,
    /^git:\/\/(www\.)*github\.com\/(?<owner>[\w-]+)\/(?<repo>[\w-]+)(\.git)*$/,
    /^git@github\.com:(?<owner>[\w-]+)\/(?<repo>[\w-]+)\.git$/
  ].each do |re|
    if m = re.match(uri)
      return { owner: m[:owner], repo: m[:repo] }
    end
  end
  nil
end

def get_master_sha(repo_hash)
  Octokit::Client.new(login: ENV['GH_USER'] || ENV['USER'], password: ENV['GH_PASSWORD'])
                 .commit(repo_hash, 'master')[:sha]
end

namespace :news do
  lockfile = JSON::parse(File.read('Berksfile.lock'))

  repos, community = lockfile['sources'].partition {|k,v| v['git']}

  gh_repos, other_repos = repos.map {|a| a[1].update( name: a[0], github: uri_to_gh(a[1]['git'])) }#.tap {|x| pp x}
                               .partition {|a| a[:github]}

  puts "Warn: unrecognized repos: #{other_repos.map {|r| "#{r[:name]}: #{r['git']}" }.join ', '}" unless other_repos.empty?

  desc 'cookbook news for all cookbooks'
  task 'all' => ['community', 'github']

  desc 'new versions of community cookbooks'
  task 'community' => community.map {|a| a[0] }

  community.each do |cb|
    name = cb[0]
    version = Gem::Version.new cb[1]['locked_version']

    desc "new versions of cookbook #{name}"
    task name do
      cb_data = JSON::parse(open("https://cookbooks.opscode.com/api/v1/cookbooks/#{name}").read)
      newer = cb_data['versions'].map {|url| Gem::Version.new(/^.*\/([\d_]+)$/.match(url).captures.first.gsub(/_/,'.')) }
                                 .take_while {|ver| ver > version }
                                 .join ', '
      puts "https://community.opscode.com/cookbooks/#{name} : #{newer}" unless newer.empty?
    end
  end

  desc 'upstream changes for all cookbooks from github'
  task 'github' => gh_repos.map {|a| a[:name]}

  gh_repos.each do |cb|
    desc "upstream changes for cookbook #{cb[:name]} in #{cb[:github][:owner]}/#{cb[:github][:repo]}"
    task cb[:name] do
      begin
        master = get_master_sha cb[:github]
      rescue
        puts "Warn: #{$!}"
      end
      
      unless master == cb['ref']
        sh "#{$open} https://github.com/#{cb[:github][:owner]}/#{cb[:github][:repo]}/compare/#{cb['ref']}...master"
      end
    end
  end
end