1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
|
#!/usr/bin/python
# Copyright 2010-2013 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 logging
import os
import pickle
import platform
import signal
import sys
import time
def debug_signal(signum, frame):
import pdb
pdb.set_trace()
if platform.python_implementation() == 'Jython':
debug_signum = signal.SIGUSR2 # bug #424259
else:
debug_signum = signal.SIGUSR1
signal.signal(debug_signum, 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._internal_caller = True
portage._disable_legacy_globals()
from portage.util._async.ForkProcess import ForkProcess
from portage.util._eventloop.global_event_loop import global_event_loop
from _emerge.PipeReader import PipeReader
class FifoWriter(ForkProcess):
__slots__ = ('buf', 'fifo',)
def _run(self):
# Atomically write the whole buffer into the fifo.
with open(self.fifo, 'wb', 0) as f:
f.write(self.buf)
return os.EX_OK
class EbuildIpc(object):
# Timeout for each individual communication attempt (we retry
# as long as the daemon process appears to be alive).
_COMMUNICATE_RETRY_TIMEOUT_MS = 15000
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 _run_writer(self, fifo_writer, msg):
"""
Wait on pid and return an appropriate exit code. This
may return unsuccessfully due to timeout if the daemon
process does not appear to be alive.
"""
start_time = time.time()
fifo_writer.start()
eof = fifo_writer.poll() is not None
while not eof:
fifo_writer._wait_loop(timeout=self._COMMUNICATE_RETRY_TIMEOUT_MS)
eof = fifo_writer.poll() is not None
if eof:
break
elif self._daemon_is_alive():
self._timeout_retry_msg(start_time, msg)
else:
fifo_writer.cancel()
self._no_daemon_msg()
fifo_writer.wait()
return 2
return fifo_writer.wait()
def _receive_reply(self, input_fd):
start_time = time.time()
pipe_reader = PipeReader(input_files={"input_fd":input_fd},
scheduler=global_event_loop())
pipe_reader.start()
eof = pipe_reader.poll() is not None
while not eof:
pipe_reader._wait_loop(timeout=self._COMMUNICATE_RETRY_TIMEOUT_MS)
eof = pipe_reader.poll() is not None
if not eof:
if self._daemon_is_alive():
self._timeout_retry_msg(start_time,
portage.localization._('during read'))
else:
pipe_reader.cancel()
self._no_daemon_msg()
return 2
buf = pipe_reader.getvalue()
retval = 2
if not buf:
portage.util.writemsg_level(
"ebuild-ipc: %s\n" % \
(portage.localization._('read failed'),),
level=logging.ERROR, noiselevel=-1)
else:
try:
reply = pickle.loads(buf)
except SystemExit:
raise
except Exception as e:
# The pickle module can raise practically
# any exception when given corrupt data.
portage.util.writemsg_level(
"ebuild-ipc: %s\n" % (e,),
level=logging.ERROR, noiselevel=-1)
else:
(out, err, retval) = reply
if out:
portage.util.writemsg_stdout(out, noiselevel=-1)
if err:
portage.util.writemsg(err, noiselevel=-1)
return retval
def _communicate(self, args):
if not self._daemon_is_alive():
self._no_daemon_msg()
return 2
# Open the input fifo before the output fifo, in order to make it
# possible for the daemon to send a reply without blocking. This
# improves performance, and also makes it possible for the daemon
# to do a non-blocking write without a race condition.
input_fd = os.open(self.ipc_out_fifo,
os.O_RDONLY|os.O_NONBLOCK)
# Use forks so that the child process can handle blocking IO
# un-interrupted, while the parent handles all timeout
# considerations. This helps to avoid possible race conditions
# from interference between timeouts and blocking IO operations.
msg = portage.localization._('during write')
retval = self._run_writer(FifoWriter(buf=pickle.dumps(args),
fifo=self.ipc_in_fifo, scheduler=global_event_loop()), msg)
if retval != os.EX_OK:
portage.util.writemsg_level(
"ebuild-ipc: %s: %s\n" % (msg,
portage.localization._('subprocess failure: %s') % \
retval), level=logging.ERROR, noiselevel=-1)
return retval
if not self._daemon_is_alive():
self._no_daemon_msg()
return 2
return self._receive_reply(input_fd)
def ebuild_ipc_main(args):
ebuild_ipc = EbuildIpc()
return ebuild_ipc.communicate(args)
if __name__ == '__main__':
sys.exit(ebuild_ipc_main(sys.argv[1:]))
|
GitWeb