Contents

# This module contains logic to find matching content hash for a given commit.
module Dockly::History
  module_function

  ASCII_FILE_SEP = 28.chr
  ASCII_RECORD_SEP = 30.chr

  TAG_PREFIX = 'dockly-'

  def push_content_tag!
    fail 'An SSH agent must be running to push the tag' if ENV['SSH_AUTH_SOCK'].nil?
    refs = ["refs/tags/#{content_tag}"]
    remotes = repo.capturing.remote(:v => true).split(/\n/).map{ |r| r.split.first }.uniq
    remotes.each do |remote|
      repo.push(remote, refs)
    end
  end

  def write_content_tag!
    repo.tag(content_tag, repo.capturing.rev_parse('HEAD').chomp)
  end

  def duplicate_build?
    !duplicate_build_sha.nil?
  end

  def duplicate_build_sha
    return @duplicate_build_sha if @duplicate_build_sha
    sha = tags[content_tag]
    @duplicate_build_sha = sha unless sha == repo.capturing.rev_parse('HEAD').chomp
  end

  def tags
    @tags ||= Hash.new do |hash, key|
      tag = repo.capturing.show_ref({ :tags => true }, key).chomp rescue nil
      hash[key] = repo.capturing.rev_parse(key).chomp if tag
    end
  end

  def content_tag
    @content_tag ||= TAG_PREFIX + content_hash_for(ls_files)
  end

  def ls_files
    repo.capturing.ls_tree({ :name_only => true, :r => true }, 'HEAD').split
  end

  def content_hash_for(paths)
    paths.sort.each_with_object(Digest::SHA384.new) do |path, hash|
      next unless File.exist?(path)
      mode = File::Stat.new(path).mode
      data = File.read(path)
      str = [path, mode, data].join(ASCII_RECORD_SEP.chr) + ASCII_FILE_SEP.chr
      hash.update(str)
    end.hexdigest
  end

  def repo
    @repo ||= MiniGit.new('.')
  end
end

Version data entries

1 entries across 1 versions & 1 rubygems

Version	Path
dockly-3.1.0	lib/dockly/history.rb