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require "docker"
module Train::Transports
class Docker < Train.plugin(1)
name "docker"
include_options Train::Extras::CommandWrapper
option :host, required: true
option :docker_url, required: false
def connection(state = {}, &block)
opts = merge_options(options, state || {})
validate_options(opts)
if @connection && @connection_options == opts
reuse_connection(&block)
else
create_new_connection(opts, &block)
end
end
private
# Creates a new Docker connection instance and save it for potential future
# reuse.
#
# @param options [Hash] connection options
# @return [Docker::Connection] a Docker connection instance
# @api private
def create_new_connection(options, &block)
if @connection
logger.debug("[Docker] shutting previous connection #{@connection}")
@connection.close
end
@connection_options = options
@connection = Connection.new(options, &block)
end
# Return the last saved Docker connection instance.
#
# @return [Docker::Connection] a Docker connection instance
# @api private
def reuse_connection
logger.debug("[Docker] reusing existing connection #{@connection}")
yield @connection if block_given?
@connection
end
end
end
class Train::Transports::Docker
class Connection < BaseConnection
def initialize(conf)
super(conf)
@id = options[:host]
docker_url = options[:docker_url]
if RUBY_PLATFORM =~ /windows|mswin|msys|mingw|cygwin/
# Docker Desktop for windows. Must override socket location.
# https://docs.docker.com/desktop/faqs/#how-do-i-connect-to-the-remote-docker-engine-api
# docker_socket ||= "npipe:////./pipe/docker_engine" # # Doesn't require a settings change, but also doesn't work
docker_url ||= "tcp://localhost:2375"
end
Docker.url = docker_url if docker_url
@container = ::Docker::Container.get(@id) ||
raise("Can't find Docker container #{@id}")
@cmd_wrapper = nil
@cmd_wrapper = CommandWrapper.load(self, @options)
@probably_windows = nil
end
def close
# nothing to do at the moment
end
def uri
if @container.nil?
"docker://#{@id}"
else
"docker://#{@container.id}"
end
end
def unique_identifier
uuid = @container.nil? ? @id : @container.id # default uuid set to the docker host.
unless sniff_for_windows?
cmd = run_command_via_connection("head -1 /proc/self/cgroup|cut -d/ -f3") if file("/proc/self/cgroup").exist?
unless cmd.stdout.empty?
uuid = cmd.stdout.strip
end
end
uuid
end
private
def file_via_connection(path)
if os.aix?
Train::File::Remote::Aix.new(self, path)
elsif os.solaris?
Train::File::Remote::Unix.new(self, path)
elsif os.windows?
Train::File::Remote::Windows.new(self, path)
else
Train::File::Remote::Linux.new(self, path)
end
end
def run_command_via_connection(cmd, &_data_handler)
cmd = @cmd_wrapper.run(cmd) unless @cmd_wrapper.nil?
# Cannot use os.windows? here because it calls run_command_via_connection,
# causing infinite recursion during initial platform detection
if sniff_for_windows?
invocation = cmd_run_command(cmd)
else
invocation = sh_run_command(cmd)
end
stdout, stderr, exit_status = @container.exec(
invocation, user: @options[:user]
)
CommandResult.new(stdout.join, stderr.join, exit_status)
rescue ::Docker::Error::DockerError => _
raise
rescue => _
# @TODO: differentiate any other error
raise
end
def sh_run_command(cmd)
["/bin/sh", "-c", cmd]
end
def cmd_run_command(cmd)
["cmd.exe", "/s", "/c", cmd]
end
def sniff_for_windows?
return @probably_windows unless @probably_windows.nil?
# Run a command using /bin/sh, which should fail under Windows
stdout, _stderr, _exit_status = @container.exec(
sh_run_command("true"), user: @options[:user]
)
@probably_windows = !!stdout.detect { |l| l.include? "failure in a Windows system call" }
end
end
end
|
