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#!/usr/bin/env python
#
# dispatcher.py - Subprocess running as root to call larch scripts
#
# (c) Copyright 2010 Michael Towers (larch42 at googlemail dot com)
#
# This file is part of the larch project.
#
# larch is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# larch is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with larch; if not, write to the Free Software Foundation, Inc.,
# 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
#
#----------------------------------------------------------------------------
#2010.07.19
import os, sys, threading, signal
from subprocess import Popen, PIPE, STDOUT
try:
import json as serialize
except:
import simplejson as serialize
module_dir = os.path.dirname(os.path.realpath(__file__))
base_dir = os.path.dirname(module_dir)
def out(key, line):
sys.stdout.write(str(key) + ':' + line + '\n')
sys.stdout.flush()
# Signal dispatcher started
out(0, '==')
def input_reader():
global process
id = process.pid
while True:
line = process.stdout.readline()
if not line:
break
out(id, line.rstrip())
process.wait()
out(id, '/%d' % process.returncode)
process = None
def kill():
"""Kill subprocesses (well, interrupt actually).
"""
if process:
os.killpg(process.pid, signal.SIGINT)
process = None
while True:
line = sys.stdin.readline()
if line:
line = line.rstrip()
else:
# Controlling process died
break
cmdx = line.split(None, 1)
cmd = cmdx[0]
response = ''
if cmd in ('archin', 'larchify', 'live_iso', 'live_part', 'boot_iso',
'test'):
# Start a larch script, together with a thread to read from it.
# The arguments are passed as a serialized list
if process:
response = ("!*** Bug (Dispatcher ERROR):"
" process already running (%d)" % process.pid)
else:
cmdx2 = cmdx[1].split(':', 1)
cmds = ([base_dir + '/cli/%s.py' % cmd, '-s']
+ serialize.loads(cmdx2[1]))
process = Popen(cmds,
preexec_fn=os.setpgrp, # to facilitate interruption
cwd=cmdx2[0], # set to project directory
stdin=PIPE,
stdout=PIPE,
stderr=STDOUT)
t = threading.Thread(target=input_reader, args=())
t.start()
elif cmd.startswith('??'):
process.stdin.write(cmd + '\n')
process.stdin.flush()
elif cmd == 'kill':
kill()
elif cmd != 'quit':
response = "!*** Bug (Dispatcher command): " + line
sys.stderr.write(response + '\n!+\n')
sys.stderr.flush()
if cmd == 'quit':
break
kill()
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