Class: Docker::Image

Inherits:
Object
  • Object
show all
Extended by:
Error
Includes:
Error
Defined in:
lib/docker/image.rb

Overview

This class represents a Docker Image.

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(connection, id = nil, info = {}) ⇒ Image

The private new method accepts a connection and optional id.



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# File 'lib/docker/image.rb', line 8

def initialize(connection, id = nil, info = {})
  if connection.is_a?(Docker::Connection)
    @connection, @id, @info = connection, id, info
  else
    raise ArgumentError, "Expected a Docker::Connection, got: #{connection}."
  end
end

Instance Attribute Details

#connection ⇒ Object

Returns the value of attribute connection.



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# File 'lib/docker/image.rb', line 5

def connection
  @connection
end

#id ⇒ Object

Returns the value of attribute id.



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# File 'lib/docker/image.rb', line 5

def id
  @id
end

#info ⇒ Object

Returns the value of attribute info.



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# File 'lib/docker/image.rb', line 5

def info
  @info
end

Class Method Details

.all(opts = {}, conn = Docker.connection) ⇒ Object

Return every Image.



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# File 'lib/docker/image.rb', line 120

def all(opts = {}, conn = Docker.connection)
  hashes = Docker::Util.parse_json(conn.get('/images/json', opts)) || []
  hashes.map { |hash| new(conn, hash['Id'], hash.tap{|h| h.delete('Id')}) }
end

.build(commands, opts = {}, connection = Docker.connection) ⇒ Object

Given a Dockerfile as a string, builds an Image.



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# File 'lib/docker/image.rb', line 147

def build(commands, opts = {}, connection = Docker.connection)
  body = connection.post(
    '/build', opts,
    :body => Docker::Util.create_tar('Dockerfile' => commands)
  )
  new(connection, Docker::Util.extract_id(body))
rescue Docker::Error::ServerError
  raise Docker::Error::UnexpectedResponseError
end

.build_from_dir(dir, opts = {}, connection = Docker.connection) ⇒ Object

Given a directory that contains a Dockerfile, builds an Image.



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# File 'lib/docker/image.rb', line 158

def build_from_dir(dir, opts = {}, connection = Docker.connection)
  tar = Docker::Util.create_dir_tar(dir)
  body = connection.post(
    '/build', opts,
    :headers => { 'Content-Type'      => 'application/tar',
                  'Transfer-Encoding' => 'chunked' }
  ) { tar.read(Excon.defaults[:chunk_size]).to_s }
  new(connection, Docker::Util.extract_id(body))
ensure
  tar.close unless tar.nil?
end

.create(opts = {}, creds = nil, conn = Docker.connection) ⇒ Object

Create a new Image.



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# File 'lib/docker/image.rb', line 102

def create(opts = {}, creds = nil, conn = Docker.connection)
  credentials = (creds.nil?) ? creds.to_json : Docker.creds
  headers = if credentials.nil?
    Docker::Util.build_auth_header(credentials)
  else
    {}
  end
  instance = new(conn, {}, :headers => headers)
  conn.post('/images/create', opts)
  id = opts['repo'] ? "#{opts['repo']}/#{opts['tag']}" : opts['fromImage']
  if (instance.id = id).nil?
    raise UnexpectedResponseError, 'Create response did not contain an Id'
  else
    instance
  end
end

.import(file, options = {}, connection = Docker.connection) ⇒ Object

Import an Image from the output of Docker::Container#export.



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# File 'lib/docker/image.rb', line 134

def import(file, options = {}, connection = Docker.connection)
  File.open(file, 'r') do |io|
    body = connection.post(
      '/images/create',
       options.merge('fromSrc' => '-'),
       :headers => { 'Content-Type' => 'application/tar',
                     'Transfer-Encoding' => 'chunked' }
    ) { io.read(Excon.defaults[:chunk_size]).to_s }
    new(connection, Docker::Util.parse_json(body)['status'])
  end
end

.search(query = {}, connection = Docker.connection) ⇒ Object

Given a query like ‘{ :term => ’sshd’ }‘, queries the Docker Registry for a corresponding Image.



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# File 'lib/docker/image.rb', line 127

def search(query = {}, connection = Docker.connection)
  body = connection.get('/images/search', query)
  hashes = Docker::Util.parse_json(body) || []
  hashes.map { |hash| new(connection, hash['Name']) }
end

Instance Method Details

#insert(query = {}) ⇒ Object

Insert a file into the Image, returns a new Image that has that file.



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# File 'lib/docker/image.rb', line 53

def insert(query = {})
  body = connection.post(path_for(:insert), query)
  if (id = body.match(/{"Id":"([a-f0-9]+)"}\z/)).nil? || id[1].empty?
    raise UnexpectedResponseError, "Could not find Id in '#{body}'"
  else
    self.class.send(:new, connection, id[1])
  end
end

#insert_local(opts = {}) ⇒ Object

Given a path of a local file and the path it should be inserted, creates a new Image that has that file.



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# File 'lib/docker/image.rb', line 64

def insert_local(opts = {})
  local_paths = opts.delete('localPath')
  output_path = opts.delete('outputPath')

  local_paths = [ local_paths ] unless local_paths.is_a?(Array)

  file_hash = Docker::Util.file_hash_from_paths(local_paths)

  file_hash['Dockerfile'] = dockerfile_for(file_hash, output_path)

  tar = Docker::Util.create_tar(file_hash)
  body = connection.post('/build', {}, :body => tar)
  self.class.send(:new, connection, Docker::Util.extract_id(body))
end

#push(creds = nil, options = {}) ⇒ Object

Push the Image to the Docker registry.



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# File 'lib/docker/image.rb', line 36

def push(creds = nil, options = {})
  credentials = (creds.nil?) ? Docker.creds : creds.to_json
  headers = Docker::Util.build_auth_header(credentials)
  connection.post(
    path_for(:push),
    options,
    :headers => headers
  )
  self
end

#remove ⇒ Object

Remove the Image from the server.



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# File 'lib/docker/image.rb', line 80

def remove
  connection.delete("/images/#{self.id}")
end

#run(cmd = nil) ⇒ Object

Given a command and optional list of streams to attach to, run a command on an Image. This will not modify the Image, but rather create a new Container to run the Image. If the image has an embedded config, no command is necessary, but it will fail with 500 if no config is saved with the image



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# File 'lib/docker/image.rb', line 20

def run(cmd=nil)
  opts = { 'Image' => self.id }
  opts["Cmd"] = cmd.is_a?(String) ? cmd.split(/\s+/) : cmd
  begin
    Docker::Container.create(opts, connection)
                     .tap(&:start!)
  rescue ServerError
    if cmd
      raise ServerError, "Docker Server Error."
    else
      raise ServerError, "No command specified."
    end
  end
end

#tag(opts = {}) ⇒ Object

Tag the Image.



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# File 'lib/docker/image.rb', line 48

def tag(opts = {})
  Docker::Util.parse_json(connection.post(path_for(:tag), opts))
end

#to_s ⇒ Object

Return a String representation of the Image.



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# File 'lib/docker/image.rb', line 85

def to_s
  "Docker::Image { :id => #{self.id}, :info => #{self.info.inspect}, "\
    ":connection => #{self.connection} }"
end