#!/usr/bin/python

# kills aptitude processes that eat an excessive amount of resources

# Copyright 2013 Peter Palfrader
#
# Permission is hereby granted, free of charge, to any person obtaining
# a copy of this software and associated documentation files (the
# "Software"), to deal in the Software without restriction, including
# without limitation the rights to use, copy, modify, merge, publish,
# distribute, sublicense, and/or sell copies of the Software, and to
# permit persons to whom the Software is furnished to do so, subject to
# the following conditions:
#
# The above copyright notice and this permission notice shall be
# included in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

import os
import errno
import sys
try:
	import psutil
except OSError, e:
	# XXX: This is a hack, but since we are run from cron, it's
	# better to handle this on the next run than to send mail.
	if e.errno == errno.ENOENT:
		sys.exit(0)

total_mem = psutil.phymem_usage().total
cutoff_time = 60*10

for p in psutil.process_iter():
	try:
		if p.name != 'aptitude': continue
		parent = p.parent
		if parent is None: continue
		if parent.name != 'schroot': continue
		#
		rootdir = os.readlink('/proc/%d/root'%(p.pid,))
		if not rootdir.startswith('/var/lib/schroot/mount'): continue
		#
		used = p.get_memory_info().vms
		if used < total_mem: continue
		#
		cputime = p.get_cpu_times().user
		if cputime < cutoff_time: continue
		#
		p.kill()
	except psutil.error.NoSuchProcess:
		pass