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#!/usr/bin/python
# Copyright 2010 Gentoo Foundation
# Distributed under the terms of the GNU General Public License v2
#
# This is a helper which ebuild processes can use
# to communicate with portage's main python process.
import array
import logging
import os
import pickle
import select
import signal
import sys
import time
def debug_signal(signum, frame):
import pdb
pdb.set_trace()
signal.signal(signal.SIGUSR1, debug_signal)
# Avoid sandbox violations after python upgrade.
pym_path = os.path.join(os.path.dirname(
os.path.dirname(os.path.realpath(__file__))), "pym")
if os.environ.get("SANDBOX_ON") == "1":
sandbox_write = os.environ.get("SANDBOX_WRITE", "").split(":")
if pym_path not in sandbox_write:
sandbox_write.append(pym_path)
os.environ["SANDBOX_WRITE"] = \
":".join(filter(None, sandbox_write))
import portage
portage._disable_legacy_globals()
class EbuildIpc(object):
# Timeout for each individual communication attempt (we retry
# as long as the daemon process appears to be alive).
_COMMUNICATE_RETRY_TIMEOUT_SECONDS = 15
_BUFSIZE = 4096
def __init__(self):
self.fifo_dir = os.environ['PORTAGE_BUILDDIR']
self.ipc_in_fifo = os.path.join(self.fifo_dir, '.ipc_in')
self.ipc_out_fifo = os.path.join(self.fifo_dir, '.ipc_out')
self.ipc_lock_file = os.path.join(self.fifo_dir, '.ipc_lock')
def _daemon_is_alive(self):
try:
builddir_lock = portage.locks.lockfile(self.fifo_dir,
wantnewlockfile=True, flags=os.O_NONBLOCK)
except portage.exception.TryAgain:
return True
else:
portage.locks.unlockfile(builddir_lock)
return False
def communicate(self, args):
# Make locks quiet since unintended locking messages displayed on
# stdout could corrupt the intended output of this program.
portage.locks._quiet = True
lock_obj = portage.locks.lockfile(self.ipc_lock_file, unlinkfile=True)
try:
return self._communicate(args)
finally:
portage.locks.unlockfile(lock_obj)
def _timeout_retry_msg(self, start_time, when):
time_elapsed = time.time() - start_time
portage.util.writemsg_level(
portage.localization._(
'ebuild-ipc timed out %s after %d seconds,' + \
' retrying...\n') % (when, time_elapsed),
level=logging.ERROR, noiselevel=-1)
def _no_daemon_msg(self):
portage.util.writemsg_level(
portage.localization._(
'ebuild-ipc: daemon process not detected\n'),
level=logging.ERROR, noiselevel=-1)
def _communicate(self, args):
if not self._daemon_is_alive():
self._no_daemon_msg()
return 2
start_time = time.time()
# File streams are in unbuffered mode since we do atomic
# read and write of whole pickles.
input_fd = os.open(self.ipc_out_fifo,
os.O_RDONLY|os.O_NONBLOCK)
input_file = os.fdopen(input_fd, 'rb', 0)
output_file = None
while True:
try:
try:
portage.exception.AlarmSignal.register(
self._COMMUNICATE_RETRY_TIMEOUT_SECONDS)
if output_file is not None:
output_file.close()
output_file = None
output_file = open(self.ipc_in_fifo, 'wb', 0)
# Write the whole pickle in a single atomic write() call,
# since the reader is in non-blocking mode and we want
# it to get the whole pickle at once.
output_file.write(pickle.dumps(args))
output_file.close()
break
finally:
portage.exception.AlarmSignal.unregister()
except portage.exception.AlarmSignal:
if self._daemon_is_alive():
self._timeout_retry_msg(start_time,
portage.localization._('during write'))
else:
self._no_daemon_msg()
return 2
start_time = time.time()
while True:
events = select.select([input_file], [], [],
self._COMMUNICATE_RETRY_TIMEOUT_SECONDS)
if events[0]:
break
else:
if self._daemon_is_alive():
self._timeout_retry_msg(start_time,
portage.localization._('during select'))
else:
self._no_daemon_msg()
return 2
start_time = time.time()
while True:
try:
try:
portage.exception.AlarmSignal.register(
self._COMMUNICATE_RETRY_TIMEOUT_SECONDS)
# Read the whole pickle in a single atomic read() call.
buf = array.array('B')
try:
buf.fromfile(input_file, self._BUFSIZE)
except (EOFError, IOError) as e:
if not buf:
portage.util.writemsg_level(
"ebuild-ipc: %s\n" % (e,),
level=logging.ERROR, noiselevel=-1)
break
finally:
portage.exception.AlarmSignal.unregister()
except portage.exception.AlarmSignal:
if self._daemon_is_alive():
self._timeout_retry_msg(start_time,
portage.localization._('during read'))
else:
self._no_daemon_msg()
return 2
rval = 2
if buf:
try:
reply = pickle.loads(buf.tostring())
except (EnvironmentError, EOFError, ValueError,
pickle.UnpicklingError) as e:
portage.util.writemsg_level(
"ebuild-ipc: %s\n" % (e,),
level=logging.ERROR, noiselevel=-1)
else:
input_file.close()
(out, err, rval) = reply
if out:
portage.util.writemsg_stdout(out, noiselevel=-1)
if err:
portage.util.writemsg(err, noiselevel=-1)
return rval
def ebuild_ipc_main(args):
ebuild_ipc = EbuildIpc()
return ebuild_ipc.communicate(args)
if __name__ == '__main__':
sys.exit(ebuild_ipc_main(sys.argv[1:]))
|
