Generate patches from gerrit

generate_patch.rb

#!/usr/bin/env ruby

# Generate patch from gerrit

require 'optparse'

def generatePatch(base_branch, topic_pattern, output_dir)
  `git review -l | sed "s,\x1B\[[0-9;]*[a-zA-Z],,g"`.lines do |line|
    _, patch, topic = line.match(/(\d+).*(#{topic_pattern}).*/).to_a
    next if not patch or not topic

    topic.sub! '/', '_'

    # Download patch from gerrit
    `git review -d #{patch}`

    # Get current branch
    branch = `git rev-parse --abbrev-ref HEAD`

    # Generate patch
    `git format-patch #{base_branch} --stdout > #{output_dir}/#{topic}.patch`

    # Cleanup
    `git checkout -q #{base_branch}`
    `git branch -D #{branch}`

    puts "Generated #{topic}.patch"
  end
end

options = {}
optparse = OptionParser.new do|opts|
  opts.banner = "Usage: generate_patch.rb [options]"

  options[:pattern] = 'bug\/\d+'
  opts.on( '-p', '--pattern PATTERN', 'Match gerrit topic with PATTERN' ) do |pattern|
    options[:pattern] = pattern
  end

  options[:branch] = 'master'
  opts.on( '-b', '--branch BRANCH', 'Generate patches aginst BRANCH' ) do |branch|
    options[:branch] = branch
  end

  options[:output] = '.'
  opts.on( '-o', '--output DIR', 'Save patches to DIR' ) do |output|
    options[:output] = output
  end

  opts.on( '-h', '--help', 'Display this screen' ) do
    puts opts
    exit
  end
end

optparse.parse!
generatePatch(options[:branch], options[:pattern], options[:output])