Module: Dockly::History

Defined in:
lib/dockly/history.rb

Overview

This module contains logic to find matching content hash for a given commit.

Constant Summary collapse

ASCII_FILE_SEP = 
28.chr
ASCII_RECORD_SEP = 
30.chr
TAG_PREFIX = 
'dockly-'

Class Method Summary collapse

Class Method Details

.content_hash_for(paths) ⇒ Object 



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# File 'lib/dockly/history.rb', line 51

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

.content_tag ⇒ Object 



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# File 'lib/dockly/history.rb', line 41

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

.duplicate_build? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/dockly/history.rb', line 24

def duplicate_build?
  !duplicate_build_sha.nil?
end

.duplicate_build_sha ⇒ Object 



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# File 'lib/dockly/history.rb', line 28

def duplicate_build_sha
  return @duplicate_build_sha if @duplicate_build_sha
  sha = tags[content_tag]
  @duplicate_build_sha = sha unless sha == repo.head.target_id
end

.ls_files ⇒ Object 



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# File 'lib/dockly/history.rb', line 45

def ls_files
  repo.head.target.tree.walk(:preorder)
    .map { |root, elem| [root, elem[:name]].compact.join }
    .select(&File.method(:file?))
end

.push_content_tag! ⇒ Object 



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# File 'lib/dockly/history.rb', line 10

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}"]
  repo.remotes.each do |remote|
    username = remote.url.split('@').first
    creds = Rugged::Credentials::SshKeyFromAgent.new(username: username)
    remote.push(refs, credentials: creds)
  end
end

.repo ⇒ Object 



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# File 'lib/dockly/history.rb', line 61

def repo
  @repo ||= Rugged::Repository.discover('.')
end

.tags ⇒ Object 



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# File 'lib/dockly/history.rb', line 34

def tags
  @tags ||= Hash.new do |hash, key|
    tag = repo.tags[key]
    hash[key] = tag.target_id if tag
  end
end

.write_content_tag! ⇒ Object 



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# File 'lib/dockly/history.rb', line 20

def write_content_tag!
  repo.tags.create(content_tag, repo.head.target_id, true)
end