require 'thor' module CIDE # Simple docker client helper module Docker # Generates a valid id for docker from any string def self.id(str) str.to_s.downcase.gsub(/[^a-z0-9\-_.]/, '_') end # Raised when a docker command exits with a status higher than zero class Error < StandardError attr_reader :exitstatus def initialize(exitstatus) @exitstatus = exitstatus super("Failed with exitstatus #{exitstatus}") end end class VersionError < StandardError; end def docker_image_ids(filter_by: false) args = ['--no-trunc'] args << ['--filter', filter_by] if filter_by lines = docker('images', *args, capture: true).lines[1..-1] lines .map { |line| line.split(/\s+/) } .map { |line| line[2] } end def docker(*args, verbose: false, capture: false) cmd = (['docker'] + args).map(&:to_s) p cmd if verbose if capture r, w = IO.pipe pid = Process.spawn(*cmd, out: w) w.close return r.read else pid = Process.spawn(*cmd) return 0 end ensure Process.wait(pid) exitstatus = $?.exitstatus raise Error, exitstatus if exitstatus > 0 end end end