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#!/usr/bin/env ruby
require "base64"
require "optparse"
require "socket"
usage_output = "USAGE:\n github-fast-env SCRIPT_PATH [options]"
$options = {:verbose => false}
OptionParser.new do |options|
options.banner = usage_output
options.on("-v", "--verbose", "Show verbose output") do
$options[:verbose] = true
end
end.parse!
if not ARGV or ARGV.empty?
$stderr.puts "error: missing argument (script path)\n\n"
$stderr.puts usage_output
exit 1
end
if ARGV.length > 1
$stderr.puts "error: only one script expected\n\n"
$stderr.puts usage_output
exit 1
end
# TODO: support arguments
# TODO: forward signals
script_path = File.realpath(ARGV[0])
control_socket_path = "/tmp/github-fast-envd.sock"
$control_socket = UNIXSocket.new(control_socket_path)
def log(level, message)
if level == "error" or $options[:verbose]
$stderr.puts "[github-fast-env] #{level}: #{message}"
end
end
def read_command(control_socket)
ready_ios = IO.select([control_socket], [], [], 10)
if not ready_ios
log "error", "timeout while communicating with github-fast-envd"
exit 1
end
response = control_socket.readline.strip.split(" ", 2)
if response.empty?
log "error", "malformed response from github-fast-envd"
exit 1
end
command = response[0]
if command == "error"
if response.length < 2
log "error", "malformed error response from github-fast-envd"
exit 1
end
error_message = response[1]
log "error", "#{error_message}"
exit 1
end
if command == "script_error"
if response.length < 2
log "error", "malformed script error response from github-fast-envd"
exit 1
end
error_message = Base64.decode64(response[1])
$stderr.puts error_message
exit 1
end
arguments = response[1].nil? ? [] : response[1].split(" ")
return command, arguments
end
log "info", "connected to control socket"
encoded_script_path = Base64.encode64(script_path).delete("\n")
$control_socket.puts "new v1 #{encoded_script_path}"
pipes = {"stdin" => nil, "stdout" => nil, "stderr" => nil}
while true
command, arguments = read_command($control_socket)
if command == "ready"
break
end
if not ["stdin", "stdout", "stderr"].include?(command) or arguments.empty?
log "error", "malformed response"
exit 1
end
pipe_path = arguments[0]
log "info", "connecting to #{pipe_path}"
if command == "stdin"
pipes[command] = File::open(pipe_path, "w")
else
pipes[command] = File::open(pipe_path, "r")
end
pipes[command].sync = true
log "info", "connected"
end
log "info", "ready"
$control_socket.puts "ready"
read_ios = [$control_socket, $stdin, pipes["stdout"], pipes["stderr"]]
exit_code = "unknown"
while read_ios.include?($control_socket) or read_ios.include?(pipes["stdout"]) or read_ios.include?(pipes["stderr"])
log "trace", read_ios.inspect
ready_read_ios, _, _ = IO.select(read_ios, [], [])
log "trace", "ready read IOs: #{ready_read_ios.inspect}"
ready_read_ios.each do |ready_read_io|
begin
if ready_read_io.equal? $stdin
log "trace", "writing to stdin"
pipes["stdin"].write ready_read_io.readpartial(4096)
elsif ready_read_io.equal? pipes["stdout"]
log "trace", "reading from stdout"
$stdout.write ready_read_io.readpartial(4096)
elsif ready_read_io.equal? pipes["stderr"]
log "trace", "reading from stderr"
$stderr.write ready_read_io.readpartial(4096)
elsif ready_read_io.equal? $control_socket
log "trace", "reading from control socket"
command, arguments = read_command($control_socket)
if command != "done"
log "error", "malformed response from github-fast-envd"
end
if !arguments.empty?
exit_code = arguments[0]
end
else
log "warn", "received input from unknown stream"
end
rescue EOFError
log "trace", "closing stream"
ready_read_io.close
end
end
read_ios = read_ios.select {|x| not x.closed?}
end
exit_code_is_numeric = Integer(exit_code) != nil rescue false
if exit_code_is_numeric
exit Integer(exit_code)
end