Class: PicsolveDockerBuilder::Helpers::Registry

Inherits:
Object
  • Object
show all
Includes:
Base
Defined in:
lib/picsolve_docker_builder/helpers/registry.rb

Overview

This represents a remote registry, that is queried for for informations about images

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Methods included from Base

#base_dir, #config_file, #config_path, #create_logger, #default_config, #log, #read_config, #validate_config

Constructor Details

#initialize(registry) ⇒ Registry

Returns a new instance of Registry.



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# File 'lib/picsolve_docker_builder/helpers/registry.rb', line 15

def initialize(registry)
  @registry = registry
end

Instance Attribute Details

#config ⇒ Object (readonly)

Returns the value of attribute config.



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# File 'lib/picsolve_docker_builder/helpers/registry.rb', line 13

def config
  @config
end

Class Method Details

.creds(*args) ⇒ Object 



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# File 'lib/picsolve_docker_builder/helpers/registry.rb', line 111

def self.creds(*args)
  auth = Base64.decode64(
    (
      *args
    )
  ).split(':')
  {
    'username' => auth[0],
    'password' => auth[1]
  }
end

.dockercfg ⇒ Object 



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# File 'lib/picsolve_docker_builder/helpers/registry.rb', line 103

def self.dockercfg
  JSON.parse(
    File.open(
      dockercfg_path
    ).read
  )
end

.dockercfg_path ⇒ Object 



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# File 'lib/picsolve_docker_builder/helpers/registry.rb', line 99

def self.dockercfg_path
  File.expand_path '~/.dockercfg'
end

.get_login_basic(registry = 'docker.picsolve.net') ⇒ Object 



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# File 'lib/picsolve_docker_builder/helpers/registry.rb', line 123

def self.(registry = 'docker.picsolve.net')
  dockercfg[registry]['auth']
rescue StandardError
  nil
end

.repo_tag_unique(image_name) ⇒ Object 



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# File 'lib/picsolve_docker_builder/helpers/registry.rb', line 129

def self.repo_tag_unique(image_name)
  repo_tag = image_name.split(%r{/})[1..-1].join('/')
  repo_tag_split = repo_tag.split(/:/)
  repo = repo_tag_split[0]
  tag = repo_tag_split[1] || 'latest'

  headers = {}
   = 
  headers['Authorization'] = "Basic #{login_basic}" \
    unless .nil?

  connection = Excon.new(
    'https://docker.picsolve.net',
    headers: headers,
    persistent: true
  )
  response = connection.get(path: "/v1/repositories/#{repo}/tags")

  tags = JSON.parse(response.body)

  hash = tags[tag]

  tags.each do |t, h|
    next if h != hash
    next if t == tag
    next unless t.match(/jenkins-[0-9]+/)
    return {
      tag_unique: "#{image_name.split(':').first}:#{t}",
      hash: hash
    }
  end

  fail "Can not find a uniqe tag for #{image_name}"
end

Instance Method Details

#api_version ⇒ Object 



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# File 'lib/picsolve_docker_builder/helpers/registry.rb', line 23

def api_version
  return @api_version unless @api_version.nil?
  if connection.get(path: '/v2/').status == 200
    @api_version = :v2
  elsif connection.get(path: '/v1/_ping').status == 200
    @api_version = :v1
  else
    api_version_unsupported
  end
  log.info "Detected api version #{@api_version} on registry #{@registry}"
  @api_version
end

#api_version_unsupported ⇒ Object 



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# File 'lib/picsolve_docker_builder/helpers/registry.rb', line 19

def api_version_unsupported
  fail 'No supported version found at registry'
end

#connection ⇒ Object 



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# File 'lib/picsolve_docker_builder/helpers/registry.rb', line 92

def connection
  @connection ||= Excon.new(
    @registry,
    headers: headers
  )
end

#headers ⇒ Object 



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# File 'lib/picsolve_docker_builder/helpers/registry.rb', line 86

def headers
  {
    'Host' => http_host
  }
end

#http_host ⇒ Object 



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# File 'lib/picsolve_docker_builder/helpers/registry.rb', line 82

def http_host
  URI(@registry).host
end

#list_tags(image) ⇒ Object 



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# File 'lib/picsolve_docker_builder/helpers/registry.rb', line 72

def list_tags(image)
  if api_version == :v1
    list_tags_v1(image)
  elsif api_version == :v2
    list_tags_v2(image)
  else
    api_version_unsupported
  end
end

#list_tags_v1(image) ⇒ Object 



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# File 'lib/picsolve_docker_builder/helpers/registry.rb', line 36

def list_tags_v1(image)
  endpoint = "/v1/repositories/#{image}/tags"
  r = connection.get(path: endpoint)
  JSON.parse(r.body)
end

#list_tags_v2(image) ⇒ Object 



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# File 'lib/picsolve_docker_builder/helpers/registry.rb', line 42

def list_tags_v2(image)
  endpoint = "/v2/#{image}/tags/list"
  r = connection.get(path: endpoint)
  o = {}
  JSON.parse(r.body)['tags'].each do |tag|
    endpoint = "/v2/#{image}/manifests/#{tag}"
    r = connection.get(path: endpoint)
    digest = Digest::SHA2.new(256)
    JSON.parse(r.body)['fsLayers'].each do |fs_hash|
      digest.update(fs_hash['blobSum'])
    end
    o[tag] = digest.to_s
  end
  o
end

#unique_tag(image, tag) ⇒ Object 



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# File 'lib/picsolve_docker_builder/helpers/registry.rb', line 58

def unique_tag(image, tag)
  tags = list_tags(image)
  fail "tag '#{tag}' not found" unless tags.include? tag
  tags.each do |my_tag, hash|
    # next if not right name
    next unless my_tag.match(/^jenkins-/)
    # next hash not matching
    next if hash != tags[tag]
    # return tag name now
    return my_tag
  end
  fail "no unique tag found for tag=#{tag}"
end