Module: Docker::Util

Includes:
Error
Defined in:
lib/docker/util.rb

Overview

This module holds shared logic that doesn’t really belong anywhere else in the gem.

Class Method Summary collapse

Class Method Details

.build_auth_header(credentials) ⇒ Object 



75
76
77
78
79
80
81
82
 
# File 'lib/docker/util.rb', line 75

def build_auth_header(credentials)
  credentials = credentials.to_json if credentials.is_a?(Hash)
  encoded_creds = Base64.encode64(credentials).gsub(/\n/, '')
  {
    'X-Registry-Auth' => encoded_creds,
    'X-Registry-Config' => encoded_creds,
  }
end

.create_dir_tar(directory) ⇒ Object 



36
37
38
39
40
41
42
43
44
 
# File 'lib/docker/util.rb', line 36

def create_dir_tar(directory)
  cwd = FileUtils.pwd
  tempfile = Tempfile.new('out')
  FileUtils.cd(directory)
  Archive::Tar::Minitar.pack('.', tempfile)
  File.new(tempfile.path, 'r')
ensure
  FileUtils.cd(cwd)
end

.create_tar(hash = {}) ⇒ Object 



26
27
28
29
30
31
32
33
34
 
# File 'lib/docker/util.rb', line 26

def create_tar(hash = {})
  output = StringIO.new
  Gem::Package::TarWriter.new(output) do |tar|
    hash.each do |file_name, input|
      tar.add_file(file_name, 0640) { |tar_file| tar_file.write(input) }
    end
  end
  output.tap(&:rewind).string
end

.extract_id(body) ⇒ Object

Raises:



46
47
48
49
50
51
52
53
 
# File 'lib/docker/util.rb', line 46

def extract_id(body)
  body.lines.to_a.reverse.each do |line|
    if (id = line.match(/Successfully built ([a-f0-9]+)/)) && !id[1].empty?
      return id[1]
    end
  end
  raise UnexpectedResponseError, "Couldn't find id: #{body}"
end

.file_hash_from_paths(local_paths) ⇒ Object

Convenience method to get the file hash corresponding to an array of local paths.



57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
 
# File 'lib/docker/util.rb', line 57

def file_hash_from_paths(local_paths)
  local_paths.each_with_object({}) do |local_path, file_hash|
    unless File.exist?(local_path)
      raise ArgumentError, "#{local_path} does not exist."
    end

    basename = File.basename(local_path)
    if File.directory?(local_path)
      tar = create_dir_tar(local_path)
      file_hash[basename] = tar.read
      tar.close
      FileUtils.rm(tar.path)
    else
      file_hash[basename] = File.read(local_path)
    end
  end
end

.fix_json(body) ⇒ Object 



22
23
24
 
# File 'lib/docker/util.rb', line 22

def fix_json(body)
  parse_json("[#{body.gsub(/}\s*{/, '},{')}]")
end

.parse_json(body) ⇒ Object 



8
9
10
11
12
 
# File 'lib/docker/util.rb', line 8

def parse_json(body)
  JSON.parse(body) unless body.nil? || body.empty? || (body == 'null')
rescue JSON::ParserError => ex
  raise UnexpectedResponseError, ex.message
end

.parse_repo_tag(str) ⇒ Object 



14
15
16
17
18
19
20
 
# File 'lib/docker/util.rb', line 14

def parse_repo_tag(str)
  if match = str.match(/\A(.*):([^:]*)\z/)
    match.captures
  else
    [str, '']
  end
end