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#!/usr/bin/env ruby
# An application preloader which doesn't actually preload anything
# and executes the requested start command.
DIR = File.expand_path(File.dirname(__FILE__))
require File.expand_path("#{DIR}/../../src/ruby_supportlib/phusion_passenger")
PhusionPassenger.locate_directories
PhusionPassenger.require_passenger_lib 'native_support'
PhusionPassenger.require_passenger_lib 'utils/json'
require 'socket'
STDOUT.sync = true
STDERR.sync = true
work_dir = ENV['PASSENGER_SPAWN_WORK_DIR']
socket_filename = "/tmp/placebo-preloader.sock.#{Process.pid}"
server = UNIXServer.new(socket_filename)
File.open("#{work_dir}/response/properties.json", 'w') do |f|
f.write(PhusionPassenger::Utils::JSON.generate(
:sockets => [
{
:address => "unix:#{socket_filename}",
:protocol => 'preloader',
:concurrency => 1
}
]
))
end
File.open("#{work_dir}/response/finish", 'w') do |f|
f.write('1')
end
def process_client_command(server, client, data)
doc = PhusionPassenger::Utils::JSON.parse(data)
if doc['command'] == 'spawn'
work_dir = doc['work_dir']
options = PhusionPassenger::Utils::JSON.parse(File.read("#{work_dir}/args.json"))
pid = fork
if pid.nil?
STDIN.reopen("#{work_dir}/stdin", 'r')
STDOUT.reopen("#{work_dir}/stdout_and_err", 'w')
STDERR.reopen(STDERR)
STDOUT.sync = STDERR.sync = true
server.close
client.close
ENV['PASSENGER_SPAWN_WORK_DIR'] = work_dir
exec(options['start_command'])
else
client.write(PhusionPassenger::Utils::JSON.generate(
:result => 'ok',
:pid => pid
))
if defined?(NativeSupport)
NativeSupport.detach_process(pid)
else
Process.detach(pid)
end
end
elsif doc['command'] == 'pid'
client.write(PhusionPassenger::Utils::JSON.generate(
:result => 'ok',
:pid => Process.pid
))
else
client.write(PhusionPassenger::Utils::JSON.generate(
:result => 'error',
:message => "Unknown command #{doc.inspect}"
))
end
end
begin
exit if ARGV[0] == "exit-immediately"
while true
ios = select([server, STDIN])[0]
if ios.include?(server)
client = server.accept
begin
process_client_command(server, client, client.readline)
ensure
client.close
end
end
if ios.include?(STDIN)
begin
STDIN.readline
rescue EOFError
exit
end
end
end
ensure
File.unlink(socket_filename) rescue nil
end