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
|
# Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
"""Shared process-related utility functions."""
import errno
import os
import subprocess
import sys
class CommandNotFound(Exception): pass
TASKKILL = os.path.join(os.environ['WINDIR'], 'system32', 'taskkill.exe')
TASKKILL_PROCESS_NOT_FOUND_ERR = 128
# On windows 2000 there is no taskkill.exe, we need to have pskill somewhere
# in the path.
PSKILL = 'pskill.exe'
PSKILL_PROCESS_NOT_FOUND_ERR = -1
def KillAll(executables):
"""Tries to kill all copies of each process in the processes list. Returns
an error if any running processes couldn't be killed.
"""
result = 0
if os.path.exists(TASKKILL):
command = [TASKKILL, '/f', '/im']
process_not_found_err = TASKKILL_PROCESS_NOT_FOUND_ERR
else:
command = [PSKILL, '/t']
process_not_found_err = PSKILL_PROCESS_NOT_FOUND_ERR
for name in executables:
new_error = RunCommand(command + [name])
# Ignore "process not found" error.
if new_error != 0 and new_error != process_not_found_err:
result = new_error
return result
def RunCommandFull(command, verbose=True, collect_output=False,
print_output=True):
"""Runs the command list.
Prints the given command (which should be a list of one or more strings).
If specified, prints its stderr (and optionally stdout) to stdout,
line-buffered, converting line endings to CRLF (see note below). If
specified, collects the output as a list of lines and returns it. Waits
for the command to terminate and returns its status.
Args:
command: the full command to run, as a list of one or more strings
verbose: if True, combines all output (stdout and stderr) into stdout.
Otherwise, prints only the command's stderr to stdout.
collect_output: if True, collects the output of the command as a list of
lines and returns it
print_output: if True, prints the output of the command
Returns:
A tuple consisting of the process's exit status and output. If
collect_output is False, the output will be [].
Raises:
CommandNotFound if the command executable could not be found.
"""
print '\n' + subprocess.list2cmdline(command).replace('\\', '/') + '\n', ###
if verbose:
out = subprocess.PIPE
err = subprocess.STDOUT
else:
out = file(os.devnull, 'w')
err = subprocess.PIPE
try:
proc = subprocess.Popen(command, stdout=out, stderr=err, bufsize=1)
except OSError, e:
if e.errno == errno.ENOENT:
raise CommandNotFound('Unable to find "%s"' % command[0])
raise
output = []
if verbose:
read_from = proc.stdout
else:
read_from = proc.stderr
line = read_from.readline()
while line:
line = line.rstrip()
if collect_output:
output.append(line)
if print_output:
# Windows Python converts \n to \r\n automatically whenever it
# encounters it written to a text file (including stdout). The only
# way around it is to write to a binary file, which isn't feasible for
# stdout. So we end up with \r\n here even though we explicitly write
# \n. (We could write \r instead, which doesn't get converted to \r\n,
# but that's probably more troublesome for people trying to read the
# files.)
print line + '\n',
# Python on windows writes the buffer only when it reaches 4k. This is
# not fast enough for all purposes.
sys.stdout.flush()
line = read_from.readline()
# Make sure the process terminates.
proc.wait()
if not verbose:
out.close()
return (proc.returncode, output)
def RunCommand(command, verbose=True):
"""Runs the command list, printing its output and returning its exit status.
Prints the given command (which should be a list of one or more strings),
then runs it and prints its stderr (and optionally stdout) to stdout,
line-buffered, converting line endings to CRLF. Waits for the command to
terminate and returns its status.
Args:
command: the full command to run, as a list of one or more strings
verbose: if True, combines all output (stdout and stderr) into stdout.
Otherwise, prints only the command's stderr to stdout.
Returns:
The process's exit status.
Raises:
CommandNotFound if the command executable could not be found.
"""
return RunCommandFull(command, verbose)[0]
def RunCommandsInParallel(commands, verbose=True, collect_output=False,
print_output=True):
"""Runs a list of commands in parallel, waits for all commands to terminate
and returns their status. If specified, the ouput of commands can be
returned and/or printed.
Args:
commands: the list of commands to run, each as a list of one or more
strings.
verbose: if True, combines stdout and stderr into stdout.
Otherwise, prints only the command's stderr to stdout.
collect_output: if True, collects the output of the each command as a list
of lines and returns it.
print_output: if True, prints the output of each command.
Returns:
A list of tuples consisting of each command's exit status and output. If
collect_output is False, the output will be [].
Raises:
CommandNotFound if any of the command executables could not be found.
"""
command_num = len(commands)
outputs = [[] for i in xrange(command_num)]
procs = [None for i in xrange(command_num)]
eofs = [False for i in xrange(command_num)]
for command in commands:
print '\n' + subprocess.list2cmdline(command).replace('\\', '/') + '\n',
if verbose:
out = subprocess.PIPE
err = subprocess.STDOUT
else:
out = file(os.devnull, 'w')
err = subprocess.PIPE
for i in xrange(command_num):
try:
command = commands[i]
procs[i] = subprocess.Popen(command, stdout=out, stderr=err, bufsize=1)
except OSError, e:
if e.errno == errno.ENOENT:
raise CommandNotFound('Unable to find "%s"' % command[0])
raise
# We could consider terminating the processes already started.
# But Popen.kill() is only available in version 2.6.
# For now the clean up is done by KillAll.
while True:
eof_all = True
for i in xrange(command_num):
if eofs[i]:
continue
if verbose:
read_from = procs[i].stdout
else:
read_from = procs[i].stderr
line = read_from.readline()
if line:
eof_all = False
line = line.rstrip()
outputs[i].append(line)
if print_output:
# Windows Python converts \n to \r\n automatically whenever it
# encounters it written to a text file (including stdout). The only
# way around it is to write to a binary file, which isn't feasible
# for stdout. So we end up with \r\n here even though we explicitly
# write \n. (We could write \r instead, which doesn't get converted
# to \r\n, but that's probably more troublesome for people trying to
# read the files.)
print line + '\n',
else:
eofs[i] = True
if eof_all:
break
# Make sure the process terminates.
for i in xrange(command_num):
procs[i].wait()
if not verbose:
out.close()
return [(procs[i].returncode, outputs[i]) for i in xrange(command_num)]
|