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@@ -1,633 +1,635 b'' | |||
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1 | 1 | # procutil.py - utility for managing processes and executable environment |
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2 | 2 | # |
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3 | 3 | # Copyright 2005 K. Thananchayan <thananck@yahoo.com> |
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4 | 4 | # Copyright 2005-2007 Matt Mackall <mpm@selenic.com> |
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5 | 5 | # Copyright 2006 Vadim Gelfer <vadim.gelfer@gmail.com> |
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6 | 6 | # |
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7 | 7 | # This software may be used and distributed according to the terms of the |
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8 | 8 | # GNU General Public License version 2 or any later version. |
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9 | 9 | |
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10 | 10 | from __future__ import absolute_import |
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11 | 11 | |
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12 | 12 | import contextlib |
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13 | 13 | import errno |
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14 | 14 | import imp |
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15 | 15 | import io |
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16 | 16 | import os |
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17 | 17 | import signal |
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18 | 18 | import subprocess |
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19 | 19 | import sys |
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20 | 20 | import time |
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21 | 21 | |
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22 | 22 | from ..i18n import _ |
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23 | 23 | from ..pycompat import ( |
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24 | 24 | getattr, |
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25 | 25 | open, |
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26 | 26 | ) |
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27 | 27 | |
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28 | 28 | from .. import ( |
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29 | 29 | encoding, |
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30 | 30 | error, |
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31 | 31 | policy, |
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32 | 32 | pycompat, |
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33 | 33 | ) |
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34 | 34 | |
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35 | 35 | osutil = policy.importmod(r'osutil') |
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36 | 36 | |
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37 | 37 | stderr = pycompat.stderr |
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38 | 38 | stdin = pycompat.stdin |
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39 | 39 | stdout = pycompat.stdout |
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40 | 40 | |
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41 | 41 | |
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42 | 42 | def isatty(fp): |
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43 | 43 | try: |
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44 | 44 | return fp.isatty() |
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45 | 45 | except AttributeError: |
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46 | 46 | return False |
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47 | 47 | |
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48 | 48 | |
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49 | 49 | # glibc determines buffering on first write to stdout - if we replace a TTY |
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50 | 50 | # destined stdout with a pipe destined stdout (e.g. pager), we want line |
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51 | 51 | # buffering (or unbuffered, on Windows) |
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52 | 52 | if isatty(stdout): |
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53 | 53 | if pycompat.iswindows: |
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54 | 54 | # Windows doesn't support line buffering |
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55 | 55 | stdout = os.fdopen(stdout.fileno(), r'wb', 0) |
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56 | else: | |
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56 | elif not pycompat.ispy3: | |
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57 | # on Python 3, stdout (sys.stdout.buffer) is already line buffered and | |
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58 | # buffering=1 is not handled in binary mode | |
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57 | 59 | stdout = os.fdopen(stdout.fileno(), r'wb', 1) |
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58 | 60 | |
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59 | 61 | if pycompat.iswindows: |
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60 | 62 | from .. import windows as platform |
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61 | 63 | |
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62 | 64 | stdout = platform.winstdout(stdout) |
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63 | 65 | else: |
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64 | 66 | from .. import posix as platform |
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65 | 67 | |
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66 | 68 | findexe = platform.findexe |
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67 | 69 | _gethgcmd = platform.gethgcmd |
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68 | 70 | getuser = platform.getuser |
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69 | 71 | getpid = os.getpid |
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70 | 72 | hidewindow = platform.hidewindow |
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71 | 73 | quotecommand = platform.quotecommand |
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72 | 74 | readpipe = platform.readpipe |
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73 | 75 | setbinary = platform.setbinary |
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74 | 76 | setsignalhandler = platform.setsignalhandler |
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75 | 77 | shellquote = platform.shellquote |
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76 | 78 | shellsplit = platform.shellsplit |
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77 | 79 | spawndetached = platform.spawndetached |
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78 | 80 | sshargs = platform.sshargs |
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79 | 81 | testpid = platform.testpid |
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80 | 82 | |
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81 | 83 | try: |
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82 | 84 | setprocname = osutil.setprocname |
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83 | 85 | except AttributeError: |
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84 | 86 | pass |
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85 | 87 | try: |
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86 | 88 | unblocksignal = osutil.unblocksignal |
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87 | 89 | except AttributeError: |
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88 | 90 | pass |
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89 | 91 | |
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90 | 92 | closefds = pycompat.isposix |
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91 | 93 | |
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92 | 94 | |
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93 | 95 | def explainexit(code): |
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94 | 96 | """return a message describing a subprocess status |
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95 | 97 | (codes from kill are negative - not os.system/wait encoding)""" |
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96 | 98 | if code >= 0: |
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97 | 99 | return _(b"exited with status %d") % code |
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98 | 100 | return _(b"killed by signal %d") % -code |
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99 | 101 | |
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100 | 102 | |
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101 | 103 | class _pfile(object): |
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102 | 104 | """File-like wrapper for a stream opened by subprocess.Popen()""" |
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103 | 105 | |
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104 | 106 | def __init__(self, proc, fp): |
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105 | 107 | self._proc = proc |
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106 | 108 | self._fp = fp |
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107 | 109 | |
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108 | 110 | def close(self): |
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109 | 111 | # unlike os.popen(), this returns an integer in subprocess coding |
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110 | 112 | self._fp.close() |
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111 | 113 | return self._proc.wait() |
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112 | 114 | |
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113 | 115 | def __iter__(self): |
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114 | 116 | return iter(self._fp) |
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115 | 117 | |
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116 | 118 | def __getattr__(self, attr): |
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117 | 119 | return getattr(self._fp, attr) |
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118 | 120 | |
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119 | 121 | def __enter__(self): |
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120 | 122 | return self |
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121 | 123 | |
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122 | 124 | def __exit__(self, exc_type, exc_value, exc_tb): |
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123 | 125 | self.close() |
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124 | 126 | |
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125 | 127 | |
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126 | 128 | def popen(cmd, mode=b'rb', bufsize=-1): |
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127 | 129 | if mode == b'rb': |
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128 | 130 | return _popenreader(cmd, bufsize) |
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129 | 131 | elif mode == b'wb': |
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130 | 132 | return _popenwriter(cmd, bufsize) |
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131 | 133 | raise error.ProgrammingError(b'unsupported mode: %r' % mode) |
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132 | 134 | |
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133 | 135 | |
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134 | 136 | def _popenreader(cmd, bufsize): |
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135 | 137 | p = subprocess.Popen( |
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136 | 138 | tonativestr(quotecommand(cmd)), |
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137 | 139 | shell=True, |
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138 | 140 | bufsize=bufsize, |
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139 | 141 | close_fds=closefds, |
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140 | 142 | stdout=subprocess.PIPE, |
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141 | 143 | ) |
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142 | 144 | return _pfile(p, p.stdout) |
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143 | 145 | |
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144 | 146 | |
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145 | 147 | def _popenwriter(cmd, bufsize): |
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146 | 148 | p = subprocess.Popen( |
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147 | 149 | tonativestr(quotecommand(cmd)), |
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148 | 150 | shell=True, |
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149 | 151 | bufsize=bufsize, |
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150 | 152 | close_fds=closefds, |
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151 | 153 | stdin=subprocess.PIPE, |
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152 | 154 | ) |
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153 | 155 | return _pfile(p, p.stdin) |
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154 | 156 | |
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155 | 157 | |
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156 | 158 | def popen2(cmd, env=None): |
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157 | 159 | # Setting bufsize to -1 lets the system decide the buffer size. |
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158 | 160 | # The default for bufsize is 0, meaning unbuffered. This leads to |
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159 | 161 | # poor performance on Mac OS X: http://bugs.python.org/issue4194 |
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160 | 162 | p = subprocess.Popen( |
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161 | 163 | tonativestr(cmd), |
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162 | 164 | shell=True, |
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163 | 165 | bufsize=-1, |
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164 | 166 | close_fds=closefds, |
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165 | 167 | stdin=subprocess.PIPE, |
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166 | 168 | stdout=subprocess.PIPE, |
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167 | 169 | env=tonativeenv(env), |
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168 | 170 | ) |
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169 | 171 | return p.stdin, p.stdout |
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170 | 172 | |
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171 | 173 | |
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172 | 174 | def popen3(cmd, env=None): |
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173 | 175 | stdin, stdout, stderr, p = popen4(cmd, env) |
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174 | 176 | return stdin, stdout, stderr |
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175 | 177 | |
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176 | 178 | |
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177 | 179 | def popen4(cmd, env=None, bufsize=-1): |
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178 | 180 | p = subprocess.Popen( |
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179 | 181 | tonativestr(cmd), |
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180 | 182 | shell=True, |
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181 | 183 | bufsize=bufsize, |
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182 | 184 | close_fds=closefds, |
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183 | 185 | stdin=subprocess.PIPE, |
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184 | 186 | stdout=subprocess.PIPE, |
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185 | 187 | stderr=subprocess.PIPE, |
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186 | 188 | env=tonativeenv(env), |
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187 | 189 | ) |
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188 | 190 | return p.stdin, p.stdout, p.stderr, p |
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189 | 191 | |
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190 | 192 | |
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191 | 193 | def pipefilter(s, cmd): |
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192 | 194 | '''filter string S through command CMD, returning its output''' |
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193 | 195 | p = subprocess.Popen( |
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194 | 196 | tonativestr(cmd), |
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195 | 197 | shell=True, |
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196 | 198 | close_fds=closefds, |
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197 | 199 | stdin=subprocess.PIPE, |
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198 | 200 | stdout=subprocess.PIPE, |
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199 | 201 | ) |
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200 | 202 | pout, perr = p.communicate(s) |
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201 | 203 | return pout |
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202 | 204 | |
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203 | 205 | |
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204 | 206 | def tempfilter(s, cmd): |
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205 | 207 | '''filter string S through a pair of temporary files with CMD. |
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206 | 208 | CMD is used as a template to create the real command to be run, |
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207 | 209 | with the strings INFILE and OUTFILE replaced by the real names of |
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208 | 210 | the temporary files generated.''' |
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209 | 211 | inname, outname = None, None |
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210 | 212 | try: |
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211 | 213 | infd, inname = pycompat.mkstemp(prefix=b'hg-filter-in-') |
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212 | 214 | fp = os.fdopen(infd, r'wb') |
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213 | 215 | fp.write(s) |
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214 | 216 | fp.close() |
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215 | 217 | outfd, outname = pycompat.mkstemp(prefix=b'hg-filter-out-') |
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216 | 218 | os.close(outfd) |
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217 | 219 | cmd = cmd.replace(b'INFILE', inname) |
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218 | 220 | cmd = cmd.replace(b'OUTFILE', outname) |
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219 | 221 | code = system(cmd) |
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220 | 222 | if pycompat.sysplatform == b'OpenVMS' and code & 1: |
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221 | 223 | code = 0 |
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222 | 224 | if code: |
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223 | 225 | raise error.Abort( |
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224 | 226 | _(b"command '%s' failed: %s") % (cmd, explainexit(code)) |
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225 | 227 | ) |
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226 | 228 | with open(outname, b'rb') as fp: |
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227 | 229 | return fp.read() |
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228 | 230 | finally: |
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229 | 231 | try: |
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230 | 232 | if inname: |
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231 | 233 | os.unlink(inname) |
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232 | 234 | except OSError: |
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233 | 235 | pass |
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234 | 236 | try: |
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235 | 237 | if outname: |
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236 | 238 | os.unlink(outname) |
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237 | 239 | except OSError: |
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238 | 240 | pass |
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239 | 241 | |
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240 | 242 | |
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241 | 243 | _filtertable = { |
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242 | 244 | b'tempfile:': tempfilter, |
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243 | 245 | b'pipe:': pipefilter, |
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244 | 246 | } |
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245 | 247 | |
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246 | 248 | |
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247 | 249 | def filter(s, cmd): |
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248 | 250 | b"filter a string through a command that transforms its input to its output" |
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249 | 251 | for name, fn in pycompat.iteritems(_filtertable): |
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250 | 252 | if cmd.startswith(name): |
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251 | 253 | return fn(s, cmd[len(name) :].lstrip()) |
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252 | 254 | return pipefilter(s, cmd) |
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253 | 255 | |
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254 | 256 | |
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255 | 257 | def mainfrozen(): |
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256 | 258 | """return True if we are a frozen executable. |
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257 | 259 | |
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258 | 260 | The code supports py2exe (most common, Windows only) and tools/freeze |
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259 | 261 | (portable, not much used). |
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260 | 262 | """ |
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261 | 263 | return ( |
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262 | 264 | pycompat.safehasattr(sys, "frozen") |
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263 | 265 | or pycompat.safehasattr(sys, "importers") # new py2exe |
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264 | 266 | or imp.is_frozen(r"__main__") # old py2exe |
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265 | 267 | ) # tools/freeze |
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266 | 268 | |
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267 | 269 | |
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268 | 270 | _hgexecutable = None |
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269 | 271 | |
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270 | 272 | |
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271 | 273 | def hgexecutable(): |
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272 | 274 | """return location of the 'hg' executable. |
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273 | 275 | |
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274 | 276 | Defaults to $HG or 'hg' in the search path. |
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275 | 277 | """ |
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276 | 278 | if _hgexecutable is None: |
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277 | 279 | hg = encoding.environ.get(b'HG') |
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278 | 280 | mainmod = sys.modules[r'__main__'] |
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279 | 281 | if hg: |
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280 | 282 | _sethgexecutable(hg) |
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281 | 283 | elif mainfrozen(): |
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282 | 284 | if getattr(sys, 'frozen', None) == b'macosx_app': |
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283 | 285 | # Env variable set by py2app |
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284 | 286 | _sethgexecutable(encoding.environ[b'EXECUTABLEPATH']) |
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285 | 287 | else: |
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286 | 288 | _sethgexecutable(pycompat.sysexecutable) |
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287 | 289 | elif ( |
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288 | 290 | not pycompat.iswindows |
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289 | 291 | and os.path.basename( |
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290 | 292 | pycompat.fsencode(getattr(mainmod, '__file__', b'')) |
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291 | 293 | ) |
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292 | 294 | == b'hg' |
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293 | 295 | ): |
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294 | 296 | _sethgexecutable(pycompat.fsencode(mainmod.__file__)) |
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295 | 297 | else: |
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296 | 298 | _sethgexecutable( |
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297 | 299 | findexe(b'hg') or os.path.basename(pycompat.sysargv[0]) |
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298 | 300 | ) |
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299 | 301 | return _hgexecutable |
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300 | 302 | |
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301 | 303 | |
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302 | 304 | def _sethgexecutable(path): |
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303 | 305 | """set location of the 'hg' executable""" |
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304 | 306 | global _hgexecutable |
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305 | 307 | _hgexecutable = path |
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306 | 308 | |
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307 | 309 | |
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308 | 310 | def _testfileno(f, stdf): |
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309 | 311 | fileno = getattr(f, 'fileno', None) |
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310 | 312 | try: |
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311 | 313 | return fileno and fileno() == stdf.fileno() |
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312 | 314 | except io.UnsupportedOperation: |
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313 | 315 | return False # fileno() raised UnsupportedOperation |
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314 | 316 | |
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315 | 317 | |
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316 | 318 | def isstdin(f): |
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317 | 319 | return _testfileno(f, sys.__stdin__) |
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318 | 320 | |
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319 | 321 | |
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320 | 322 | def isstdout(f): |
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321 | 323 | return _testfileno(f, sys.__stdout__) |
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322 | 324 | |
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323 | 325 | |
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324 | 326 | def protectstdio(uin, uout): |
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325 | 327 | """Duplicate streams and redirect original if (uin, uout) are stdio |
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326 | 328 | |
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327 | 329 | If uin is stdin, it's redirected to /dev/null. If uout is stdout, it's |
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328 | 330 | redirected to stderr so the output is still readable. |
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329 | 331 | |
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330 | 332 | Returns (fin, fout) which point to the original (uin, uout) fds, but |
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331 | 333 | may be copy of (uin, uout). The returned streams can be considered |
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332 | 334 | "owned" in that print(), exec(), etc. never reach to them. |
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333 | 335 | """ |
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334 | 336 | uout.flush() |
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335 | 337 | fin, fout = uin, uout |
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336 | 338 | if _testfileno(uin, stdin): |
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337 | 339 | newfd = os.dup(uin.fileno()) |
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338 | 340 | nullfd = os.open(os.devnull, os.O_RDONLY) |
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339 | 341 | os.dup2(nullfd, uin.fileno()) |
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340 | 342 | os.close(nullfd) |
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341 | 343 | fin = os.fdopen(newfd, r'rb') |
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342 | 344 | if _testfileno(uout, stdout): |
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343 | 345 | newfd = os.dup(uout.fileno()) |
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344 | 346 | os.dup2(stderr.fileno(), uout.fileno()) |
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345 | 347 | fout = os.fdopen(newfd, r'wb') |
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346 | 348 | return fin, fout |
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347 | 349 | |
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348 | 350 | |
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349 | 351 | def restorestdio(uin, uout, fin, fout): |
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350 | 352 | """Restore (uin, uout) streams from possibly duplicated (fin, fout)""" |
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351 | 353 | uout.flush() |
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352 | 354 | for f, uif in [(fin, uin), (fout, uout)]: |
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353 | 355 | if f is not uif: |
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354 | 356 | os.dup2(f.fileno(), uif.fileno()) |
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355 | 357 | f.close() |
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356 | 358 | |
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357 | 359 | |
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358 | 360 | def shellenviron(environ=None): |
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359 | 361 | """return environ with optional override, useful for shelling out""" |
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360 | 362 | |
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361 | 363 | def py2shell(val): |
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362 | 364 | b'convert python object into string that is useful to shell' |
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363 | 365 | if val is None or val is False: |
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364 | 366 | return b'0' |
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365 | 367 | if val is True: |
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366 | 368 | return b'1' |
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367 | 369 | return pycompat.bytestr(val) |
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368 | 370 | |
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369 | 371 | env = dict(encoding.environ) |
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370 | 372 | if environ: |
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371 | 373 | env.update((k, py2shell(v)) for k, v in pycompat.iteritems(environ)) |
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372 | 374 | env[b'HG'] = hgexecutable() |
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373 | 375 | return env |
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374 | 376 | |
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375 | 377 | |
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376 | 378 | if pycompat.iswindows: |
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377 | 379 | |
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378 | 380 | def shelltonative(cmd, env): |
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379 | 381 | return platform.shelltocmdexe(cmd, shellenviron(env)) |
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380 | 382 | |
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381 | 383 | tonativestr = encoding.strfromlocal |
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382 | 384 | else: |
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383 | 385 | |
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384 | 386 | def shelltonative(cmd, env): |
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385 | 387 | return cmd |
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386 | 388 | |
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387 | 389 | tonativestr = pycompat.identity |
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388 | 390 | |
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389 | 391 | |
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390 | 392 | def tonativeenv(env): |
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391 | 393 | '''convert the environment from bytes to strings suitable for Popen(), etc. |
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392 | 394 | ''' |
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393 | 395 | return pycompat.rapply(tonativestr, env) |
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394 | 396 | |
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395 | 397 | |
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396 | 398 | def system(cmd, environ=None, cwd=None, out=None): |
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397 | 399 | '''enhanced shell command execution. |
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398 | 400 | run with environment maybe modified, maybe in different dir. |
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399 | 401 | |
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400 | 402 | if out is specified, it is assumed to be a file-like object that has a |
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401 | 403 | write() method. stdout and stderr will be redirected to out.''' |
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402 | 404 | try: |
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403 | 405 | stdout.flush() |
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404 | 406 | except Exception: |
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405 | 407 | pass |
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406 | 408 | cmd = quotecommand(cmd) |
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407 | 409 | env = shellenviron(environ) |
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408 | 410 | if out is None or isstdout(out): |
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409 | 411 | rc = subprocess.call( |
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410 | 412 | tonativestr(cmd), |
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411 | 413 | shell=True, |
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412 | 414 | close_fds=closefds, |
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413 | 415 | env=tonativeenv(env), |
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414 | 416 | cwd=pycompat.rapply(tonativestr, cwd), |
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415 | 417 | ) |
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416 | 418 | else: |
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417 | 419 | proc = subprocess.Popen( |
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418 | 420 | tonativestr(cmd), |
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419 | 421 | shell=True, |
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420 | 422 | close_fds=closefds, |
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421 | 423 | env=tonativeenv(env), |
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422 | 424 | cwd=pycompat.rapply(tonativestr, cwd), |
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423 | 425 | stdout=subprocess.PIPE, |
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424 | 426 | stderr=subprocess.STDOUT, |
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425 | 427 | ) |
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426 | 428 | for line in iter(proc.stdout.readline, b''): |
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427 | 429 | out.write(line) |
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428 | 430 | proc.wait() |
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429 | 431 | rc = proc.returncode |
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430 | 432 | if pycompat.sysplatform == b'OpenVMS' and rc & 1: |
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431 | 433 | rc = 0 |
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432 | 434 | return rc |
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433 | 435 | |
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434 | 436 | |
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435 | 437 | def gui(): |
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436 | 438 | '''Are we running in a GUI?''' |
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437 | 439 | if pycompat.isdarwin: |
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438 | 440 | if b'SSH_CONNECTION' in encoding.environ: |
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439 | 441 | # handle SSH access to a box where the user is logged in |
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440 | 442 | return False |
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441 | 443 | elif getattr(osutil, 'isgui', None): |
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442 | 444 | # check if a CoreGraphics session is available |
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443 | 445 | return osutil.isgui() |
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444 | 446 | else: |
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445 | 447 | # pure build; use a safe default |
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446 | 448 | return True |
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447 | 449 | else: |
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448 | 450 | return pycompat.iswindows or encoding.environ.get(b"DISPLAY") |
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449 | 451 | |
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450 | 452 | |
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451 | 453 | def hgcmd(): |
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452 | 454 | """Return the command used to execute current hg |
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453 | 455 | |
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454 | 456 | This is different from hgexecutable() because on Windows we want |
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455 | 457 | to avoid things opening new shell windows like batch files, so we |
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456 | 458 | get either the python call or current executable. |
|
457 | 459 | """ |
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458 | 460 | if mainfrozen(): |
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459 | 461 | if getattr(sys, 'frozen', None) == b'macosx_app': |
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460 | 462 | # Env variable set by py2app |
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461 | 463 | return [encoding.environ[b'EXECUTABLEPATH']] |
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462 | 464 | else: |
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463 | 465 | return [pycompat.sysexecutable] |
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464 | 466 | return _gethgcmd() |
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465 | 467 | |
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466 | 468 | |
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467 | 469 | def rundetached(args, condfn): |
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468 | 470 | """Execute the argument list in a detached process. |
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469 | 471 | |
|
470 | 472 | condfn is a callable which is called repeatedly and should return |
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471 | 473 | True once the child process is known to have started successfully. |
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472 | 474 | At this point, the child process PID is returned. If the child |
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473 | 475 | process fails to start or finishes before condfn() evaluates to |
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474 | 476 | True, return -1. |
|
475 | 477 | """ |
|
476 | 478 | # Windows case is easier because the child process is either |
|
477 | 479 | # successfully starting and validating the condition or exiting |
|
478 | 480 | # on failure. We just poll on its PID. On Unix, if the child |
|
479 | 481 | # process fails to start, it will be left in a zombie state until |
|
480 | 482 | # the parent wait on it, which we cannot do since we expect a long |
|
481 | 483 | # running process on success. Instead we listen for SIGCHLD telling |
|
482 | 484 | # us our child process terminated. |
|
483 | 485 | terminated = set() |
|
484 | 486 | |
|
485 | 487 | def handler(signum, frame): |
|
486 | 488 | terminated.add(os.wait()) |
|
487 | 489 | |
|
488 | 490 | prevhandler = None |
|
489 | 491 | SIGCHLD = getattr(signal, 'SIGCHLD', None) |
|
490 | 492 | if SIGCHLD is not None: |
|
491 | 493 | prevhandler = signal.signal(SIGCHLD, handler) |
|
492 | 494 | try: |
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493 | 495 | pid = spawndetached(args) |
|
494 | 496 | while not condfn(): |
|
495 | 497 | if (pid in terminated or not testpid(pid)) and not condfn(): |
|
496 | 498 | return -1 |
|
497 | 499 | time.sleep(0.1) |
|
498 | 500 | return pid |
|
499 | 501 | finally: |
|
500 | 502 | if prevhandler is not None: |
|
501 | 503 | signal.signal(signal.SIGCHLD, prevhandler) |
|
502 | 504 | |
|
503 | 505 | |
|
504 | 506 | @contextlib.contextmanager |
|
505 | 507 | def uninterruptible(warn): |
|
506 | 508 | """Inhibit SIGINT handling on a region of code. |
|
507 | 509 | |
|
508 | 510 | Note that if this is called in a non-main thread, it turns into a no-op. |
|
509 | 511 | |
|
510 | 512 | Args: |
|
511 | 513 | warn: A callable which takes no arguments, and returns True if the |
|
512 | 514 | previous signal handling should be restored. |
|
513 | 515 | """ |
|
514 | 516 | |
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515 | 517 | oldsiginthandler = [signal.getsignal(signal.SIGINT)] |
|
516 | 518 | shouldbail = [] |
|
517 | 519 | |
|
518 | 520 | def disabledsiginthandler(*args): |
|
519 | 521 | if warn(): |
|
520 | 522 | signal.signal(signal.SIGINT, oldsiginthandler[0]) |
|
521 | 523 | del oldsiginthandler[0] |
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522 | 524 | shouldbail.append(True) |
|
523 | 525 | |
|
524 | 526 | try: |
|
525 | 527 | try: |
|
526 | 528 | signal.signal(signal.SIGINT, disabledsiginthandler) |
|
527 | 529 | except ValueError: |
|
528 | 530 | # wrong thread, oh well, we tried |
|
529 | 531 | del oldsiginthandler[0] |
|
530 | 532 | yield |
|
531 | 533 | finally: |
|
532 | 534 | if oldsiginthandler: |
|
533 | 535 | signal.signal(signal.SIGINT, oldsiginthandler[0]) |
|
534 | 536 | if shouldbail: |
|
535 | 537 | raise KeyboardInterrupt |
|
536 | 538 | |
|
537 | 539 | |
|
538 | 540 | if pycompat.iswindows: |
|
539 | 541 | # no fork on Windows, but we can create a detached process |
|
540 | 542 | # https://msdn.microsoft.com/en-us/library/windows/desktop/ms684863.aspx |
|
541 | 543 | # No stdlib constant exists for this value |
|
542 | 544 | DETACHED_PROCESS = 0x00000008 |
|
543 | 545 | # Following creation flags might create a console GUI window. |
|
544 | 546 | # Using subprocess.CREATE_NEW_CONSOLE might helps. |
|
545 | 547 | # See https://phab.mercurial-scm.org/D1701 for discussion |
|
546 | 548 | _creationflags = DETACHED_PROCESS | subprocess.CREATE_NEW_PROCESS_GROUP |
|
547 | 549 | |
|
548 | 550 | def runbgcommand( |
|
549 | 551 | script, env, shell=False, stdout=None, stderr=None, ensurestart=True |
|
550 | 552 | ): |
|
551 | 553 | '''Spawn a command without waiting for it to finish.''' |
|
552 | 554 | # we can't use close_fds *and* redirect stdin. I'm not sure that we |
|
553 | 555 | # need to because the detached process has no console connection. |
|
554 | 556 | subprocess.Popen( |
|
555 | 557 | tonativestr(script), |
|
556 | 558 | shell=shell, |
|
557 | 559 | env=tonativeenv(env), |
|
558 | 560 | close_fds=True, |
|
559 | 561 | creationflags=_creationflags, |
|
560 | 562 | stdout=stdout, |
|
561 | 563 | stderr=stderr, |
|
562 | 564 | ) |
|
563 | 565 | |
|
564 | 566 | |
|
565 | 567 | else: |
|
566 | 568 | |
|
567 | 569 | def runbgcommand( |
|
568 | 570 | cmd, env, shell=False, stdout=None, stderr=None, ensurestart=True |
|
569 | 571 | ): |
|
570 | 572 | '''Spawn a command without waiting for it to finish.''' |
|
571 | 573 | # double-fork to completely detach from the parent process |
|
572 | 574 | # based on http://code.activestate.com/recipes/278731 |
|
573 | 575 | pid = os.fork() |
|
574 | 576 | if pid: |
|
575 | 577 | if not ensurestart: |
|
576 | 578 | return |
|
577 | 579 | # Parent process |
|
578 | 580 | (_pid, status) = os.waitpid(pid, 0) |
|
579 | 581 | if os.WIFEXITED(status): |
|
580 | 582 | returncode = os.WEXITSTATUS(status) |
|
581 | 583 | else: |
|
582 | 584 | returncode = -(os.WTERMSIG(status)) |
|
583 | 585 | if returncode != 0: |
|
584 | 586 | # The child process's return code is 0 on success, an errno |
|
585 | 587 | # value on failure, or 255 if we don't have a valid errno |
|
586 | 588 | # value. |
|
587 | 589 | # |
|
588 | 590 | # (It would be slightly nicer to return the full exception info |
|
589 | 591 | # over a pipe as the subprocess module does. For now it |
|
590 | 592 | # doesn't seem worth adding that complexity here, though.) |
|
591 | 593 | if returncode == 255: |
|
592 | 594 | returncode = errno.EINVAL |
|
593 | 595 | raise OSError( |
|
594 | 596 | returncode, |
|
595 | 597 | b'error running %r: %s' % (cmd, os.strerror(returncode)), |
|
596 | 598 | ) |
|
597 | 599 | return |
|
598 | 600 | |
|
599 | 601 | returncode = 255 |
|
600 | 602 | try: |
|
601 | 603 | # Start a new session |
|
602 | 604 | os.setsid() |
|
603 | 605 | |
|
604 | 606 | stdin = open(os.devnull, b'r') |
|
605 | 607 | if stdout is None: |
|
606 | 608 | stdout = open(os.devnull, b'w') |
|
607 | 609 | if stderr is None: |
|
608 | 610 | stderr = open(os.devnull, b'w') |
|
609 | 611 | |
|
610 | 612 | # connect stdin to devnull to make sure the subprocess can't |
|
611 | 613 | # muck up that stream for mercurial. |
|
612 | 614 | subprocess.Popen( |
|
613 | 615 | cmd, |
|
614 | 616 | shell=shell, |
|
615 | 617 | env=env, |
|
616 | 618 | close_fds=True, |
|
617 | 619 | stdin=stdin, |
|
618 | 620 | stdout=stdout, |
|
619 | 621 | stderr=stderr, |
|
620 | 622 | ) |
|
621 | 623 | returncode = 0 |
|
622 | 624 | except EnvironmentError as ex: |
|
623 | 625 | returncode = ex.errno & 0xFF |
|
624 | 626 | if returncode == 0: |
|
625 | 627 | # This shouldn't happen, but just in case make sure the |
|
626 | 628 | # return code is never 0 here. |
|
627 | 629 | returncode = 255 |
|
628 | 630 | except Exception: |
|
629 | 631 | returncode = 255 |
|
630 | 632 | finally: |
|
631 | 633 | # mission accomplished, this child needs to exit and not |
|
632 | 634 | # continue the hg process here. |
|
633 | 635 | os._exit(returncode) |
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