Mercurial > hg
annotate mercurial/utils/procutil.py @ 43478:54f4d094bab1
procutil: suppress pytype warnings around windows-only attributes
Differential Revision: https://phab.mercurial-scm.org/D7278
author | Augie Fackler <augie@google.com> |
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date | Wed, 06 Nov 2019 15:12:46 -0500 |
parents | 227ba1afcb65 |
children | 313e3a279828 |
rev | line source |
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1 # procutil.py - utility for managing processes and executable environment |
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2 # |
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3 # Copyright 2005 K. Thananchayan <thananck@yahoo.com> |
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4 # Copyright 2005-2007 Matt Mackall <mpm@selenic.com> |
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5 # Copyright 2006 Vadim Gelfer <vadim.gelfer@gmail.com> |
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6 # |
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7 # This software may be used and distributed according to the terms of the |
10263 | 8 # GNU General Public License version 2 or any later version. |
1082 | 9 |
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10 from __future__ import absolute_import |
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11 |
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12 import contextlib |
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13 import errno |
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14 import imp |
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15 import io |
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16 import os |
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17 import signal |
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18 import subprocess |
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19 import sys |
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20 import time |
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22 from ..i18n import _ |
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23 from ..pycompat import ( |
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24 getattr, |
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25 open, |
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26 ) |
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27 |
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28 from .. import ( |
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29 encoding, |
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30 error, |
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31 policy, |
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32 pycompat, |
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33 ) |
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35 osutil = policy.importmod(r'osutil') |
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36 |
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37 stderr = pycompat.stderr |
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38 stdin = pycompat.stdin |
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39 stdout = pycompat.stdout |
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40 |
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41 |
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42 def isatty(fp): |
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43 try: |
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44 return fp.isatty() |
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45 except AttributeError: |
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46 return False |
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47 |
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48 |
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49 # glibc determines buffering on first write to stdout - if we replace a TTY |
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50 # destined stdout with a pipe destined stdout (e.g. pager), we want line |
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51 # buffering (or unbuffered, on Windows) |
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52 if isatty(stdout): |
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53 if pycompat.iswindows: |
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54 # Windows doesn't support line buffering |
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55 stdout = os.fdopen(stdout.fileno(), r'wb', 0) |
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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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59 stdout = os.fdopen(stdout.fileno(), r'wb', 1) |
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60 |
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62 from .. import windows as platform |
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63 |
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64 stdout = platform.winstdout(stdout) |
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65 else: |
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66 from .. import posix as platform |
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67 |
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68 findexe = platform.findexe |
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69 _gethgcmd = platform.gethgcmd |
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70 getuser = platform.getuser |
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71 getpid = os.getpid |
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72 hidewindow = platform.hidewindow |
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73 quotecommand = platform.quotecommand |
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74 readpipe = platform.readpipe |
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75 setbinary = platform.setbinary |
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76 setsignalhandler = platform.setsignalhandler |
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77 shellquote = platform.shellquote |
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78 shellsplit = platform.shellsplit |
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79 spawndetached = platform.spawndetached |
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80 sshargs = platform.sshargs |
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81 testpid = platform.testpid |
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82 |
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83 try: |
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84 setprocname = osutil.setprocname |
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85 except AttributeError: |
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86 pass |
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87 try: |
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88 unblocksignal = osutil.unblocksignal |
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89 except AttributeError: |
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90 pass |
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93 |
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94 |
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95 def explainexit(code): |
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96 """return a message describing a subprocess status |
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97 (codes from kill are negative - not os.system/wait encoding)""" |
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98 if code >= 0: |
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99 return _(b"exited with status %d") % code |
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100 return _(b"killed by signal %d") % -code |
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101 |
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102 |
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103 class _pfile(object): |
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104 """File-like wrapper for a stream opened by subprocess.Popen()""" |
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105 |
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106 def __init__(self, proc, fp): |
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107 self._proc = proc |
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108 self._fp = fp |
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109 |
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110 def close(self): |
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111 # unlike os.popen(), this returns an integer in subprocess coding |
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112 self._fp.close() |
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113 return self._proc.wait() |
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114 |
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115 def __iter__(self): |
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116 return iter(self._fp) |
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117 |
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118 def __getattr__(self, attr): |
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119 return getattr(self._fp, attr) |
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120 |
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121 def __enter__(self): |
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122 return self |
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123 |
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124 def __exit__(self, exc_type, exc_value, exc_tb): |
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125 self.close() |
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126 |
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127 |
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128 def popen(cmd, mode=b'rb', bufsize=-1): |
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129 if mode == b'rb': |
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130 return _popenreader(cmd, bufsize) |
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131 elif mode == b'wb': |
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132 return _popenwriter(cmd, bufsize) |
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133 raise error.ProgrammingError(b'unsupported mode: %r' % mode) |
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134 |
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135 |
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136 def _popenreader(cmd, bufsize): |
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137 p = subprocess.Popen( |
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138 tonativestr(quotecommand(cmd)), |
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139 shell=True, |
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140 bufsize=bufsize, |
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141 close_fds=closefds, |
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142 stdout=subprocess.PIPE, |
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143 ) |
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144 return _pfile(p, p.stdout) |
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145 |
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146 |
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147 def _popenwriter(cmd, bufsize): |
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148 p = subprocess.Popen( |
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149 tonativestr(quotecommand(cmd)), |
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150 shell=True, |
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151 bufsize=bufsize, |
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152 close_fds=closefds, |
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153 stdin=subprocess.PIPE, |
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154 ) |
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155 return _pfile(p, p.stdin) |
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156 |
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157 |
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158 def popen2(cmd, env=None): |
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159 # Setting bufsize to -1 lets the system decide the buffer size. |
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160 # The default for bufsize is 0, meaning unbuffered. This leads to |
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161 # poor performance on Mac OS X: http://bugs.python.org/issue4194 |
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162 p = subprocess.Popen( |
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163 tonativestr(cmd), |
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164 shell=True, |
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165 bufsize=-1, |
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166 close_fds=closefds, |
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167 stdin=subprocess.PIPE, |
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168 stdout=subprocess.PIPE, |
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169 env=tonativeenv(env), |
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170 ) |
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171 return p.stdin, p.stdout |
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172 |
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173 |
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174 def popen3(cmd, env=None): |
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175 stdin, stdout, stderr, p = popen4(cmd, env) |
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176 return stdin, stdout, stderr |
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177 |
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178 |
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179 def popen4(cmd, env=None, bufsize=-1): |
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180 p = subprocess.Popen( |
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181 tonativestr(cmd), |
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182 shell=True, |
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183 bufsize=bufsize, |
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184 close_fds=closefds, |
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185 stdin=subprocess.PIPE, |
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186 stdout=subprocess.PIPE, |
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187 stderr=subprocess.PIPE, |
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188 env=tonativeenv(env), |
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189 ) |
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190 return p.stdin, p.stdout, p.stderr, p |
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191 |
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192 |
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193 def pipefilter(s, cmd): |
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194 '''filter string S through command CMD, returning its output''' |
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195 p = subprocess.Popen( |
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196 tonativestr(cmd), |
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197 shell=True, |
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198 close_fds=closefds, |
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199 stdin=subprocess.PIPE, |
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200 stdout=subprocess.PIPE, |
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201 ) |
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202 pout, perr = p.communicate(s) |
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203 return pout |
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204 |
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205 |
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206 def tempfilter(s, cmd): |
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207 '''filter string S through a pair of temporary files with CMD. |
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208 CMD is used as a template to create the real command to be run, |
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209 with the strings INFILE and OUTFILE replaced by the real names of |
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210 the temporary files generated.''' |
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211 inname, outname = None, None |
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212 try: |
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213 infd, inname = pycompat.mkstemp(prefix=b'hg-filter-in-') |
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214 fp = os.fdopen(infd, r'wb') |
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215 fp.write(s) |
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216 fp.close() |
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217 outfd, outname = pycompat.mkstemp(prefix=b'hg-filter-out-') |
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218 os.close(outfd) |
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219 cmd = cmd.replace(b'INFILE', inname) |
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220 cmd = cmd.replace(b'OUTFILE', outname) |
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221 code = system(cmd) |
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222 if pycompat.sysplatform == b'OpenVMS' and code & 1: |
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223 code = 0 |
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224 if code: |
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225 raise error.Abort( |
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226 _(b"command '%s' failed: %s") % (cmd, explainexit(code)) |
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227 ) |
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228 with open(outname, b'rb') as fp: |
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229 return fp.read() |
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230 finally: |
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231 try: |
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232 if inname: |
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233 os.unlink(inname) |
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234 except OSError: |
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235 pass |
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236 try: |
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237 if outname: |
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238 os.unlink(outname) |
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239 except OSError: |
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240 pass |
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241 |
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242 |
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243 _filtertable = { |
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244 b'tempfile:': tempfilter, |
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245 b'pipe:': pipefilter, |
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246 } |
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247 |
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248 |
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249 def filter(s, cmd): |
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250 b"filter a string through a command that transforms its input to its output" |
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251 for name, fn in pycompat.iteritems(_filtertable): |
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252 if cmd.startswith(name): |
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253 return fn(s, cmd[len(name) :].lstrip()) |
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254 return pipefilter(s, cmd) |
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255 |
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256 |
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257 def mainfrozen(): |
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258 """return True if we are a frozen executable. |
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259 |
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260 The code supports py2exe (most common, Windows only) and tools/freeze |
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261 (portable, not much used). |
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262 """ |
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263 return ( |
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264 pycompat.safehasattr(sys, "frozen") |
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265 or pycompat.safehasattr(sys, "importers") # new py2exe |
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266 or imp.is_frozen(r"__main__") # old py2exe |
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267 ) # tools/freeze |
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268 |
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269 |
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270 _hgexecutable = None |
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271 |
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272 |
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273 def hgexecutable(): |
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274 """return location of the 'hg' executable. |
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275 |
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276 Defaults to $HG or 'hg' in the search path. |
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277 """ |
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278 if _hgexecutable is None: |
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279 hg = encoding.environ.get(b'HG') |
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280 mainmod = sys.modules[r'__main__'] |
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282 _sethgexecutable(hg) |
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283 elif mainfrozen(): |
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284 if getattr(sys, 'frozen', None) == b'macosx_app': |
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285 # Env variable set by py2app |
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286 _sethgexecutable(encoding.environ[b'EXECUTABLEPATH']) |
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287 else: |
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288 _sethgexecutable(pycompat.sysexecutable) |
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289 elif ( |
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290 not pycompat.iswindows |
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291 and os.path.basename( |
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292 pycompat.fsencode(getattr(mainmod, '__file__', b'')) |
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293 ) |
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294 == b'hg' |
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295 ): |
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296 _sethgexecutable(pycompat.fsencode(mainmod.__file__)) |
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297 else: |
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298 _sethgexecutable( |
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299 findexe(b'hg') or os.path.basename(pycompat.sysargv[0]) |
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300 ) |
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301 return _hgexecutable |
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302 |
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303 |
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304 def _sethgexecutable(path): |
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305 """set location of the 'hg' executable""" |
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306 global _hgexecutable |
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307 _hgexecutable = path |
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308 |
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309 |
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310 def _testfileno(f, stdf): |
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311 fileno = getattr(f, 'fileno', None) |
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312 try: |
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313 return fileno and fileno() == stdf.fileno() |
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314 except io.UnsupportedOperation: |
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315 return False # fileno() raised UnsupportedOperation |
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316 |
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317 |
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318 def isstdin(f): |
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319 return _testfileno(f, sys.__stdin__) |
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320 |
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321 |
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322 def isstdout(f): |
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323 return _testfileno(f, sys.__stdout__) |
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324 |
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325 |
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326 def protectstdio(uin, uout): |
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327 """Duplicate streams and redirect original if (uin, uout) are stdio |
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328 |
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329 If uin is stdin, it's redirected to /dev/null. If uout is stdout, it's |
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330 redirected to stderr so the output is still readable. |
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331 |
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332 Returns (fin, fout) which point to the original (uin, uout) fds, but |
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333 may be copy of (uin, uout). The returned streams can be considered |
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334 "owned" in that print(), exec(), etc. never reach to them. |
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335 """ |
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336 uout.flush() |
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337 fin, fout = uin, uout |
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338 if _testfileno(uin, stdin): |
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339 newfd = os.dup(uin.fileno()) |
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340 nullfd = os.open(os.devnull, os.O_RDONLY) |
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341 os.dup2(nullfd, uin.fileno()) |
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342 os.close(nullfd) |
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343 fin = os.fdopen(newfd, r'rb') |
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344 if _testfileno(uout, stdout): |
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345 newfd = os.dup(uout.fileno()) |
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346 os.dup2(stderr.fileno(), uout.fileno()) |
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347 fout = os.fdopen(newfd, r'wb') |
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348 return fin, fout |
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349 |
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350 |
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351 def restorestdio(uin, uout, fin, fout): |
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352 """Restore (uin, uout) streams from possibly duplicated (fin, fout)""" |
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353 uout.flush() |
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354 for f, uif in [(fin, uin), (fout, uout)]: |
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355 if f is not uif: |
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356 os.dup2(f.fileno(), uif.fileno()) |
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357 f.close() |
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358 |
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359 |
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360 def shellenviron(environ=None): |
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361 """return environ with optional override, useful for shelling out""" |
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362 |
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363 def py2shell(val): |
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364 b'convert python object into string that is useful to shell' |
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365 if val is None or val is False: |
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366 return b'0' |
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367 if val is True: |
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368 return b'1' |
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369 return pycompat.bytestr(val) |
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370 |
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371 env = dict(encoding.environ) |
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372 if environ: |
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373 env.update((k, py2shell(v)) for k, v in pycompat.iteritems(environ)) |
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374 env[b'HG'] = hgexecutable() |
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375 return env |
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376 |
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377 |
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378 if pycompat.iswindows: |
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379 |
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380 def shelltonative(cmd, env): |
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381 return platform.shelltocmdexe( # pytype: disable=module-attr |
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382 cmd, shellenviron(env) |
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383 ) |
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384 |
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385 tonativestr = encoding.strfromlocal |
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386 else: |
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387 |
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388 def shelltonative(cmd, env): |
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389 return cmd |
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390 |
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391 tonativestr = pycompat.identity |
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392 |
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393 |
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394 def tonativeenv(env): |
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395 '''convert the environment from bytes to strings suitable for Popen(), etc. |
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396 ''' |
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397 return pycompat.rapply(tonativestr, env) |
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398 |
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399 |
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400 def system(cmd, environ=None, cwd=None, out=None): |
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401 '''enhanced shell command execution. |
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402 run with environment maybe modified, maybe in different dir. |
508 | 403 |
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404 if out is specified, it is assumed to be a file-like object that has a |
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405 write() method. stdout and stderr will be redirected to out.''' |
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406 try: |
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407 stdout.flush() |
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408 except Exception: |
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409 pass |
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410 cmd = quotecommand(cmd) |
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411 env = shellenviron(environ) |
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412 if out is None or isstdout(out): |
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413 rc = subprocess.call( |
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414 tonativestr(cmd), |
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415 shell=True, |
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416 close_fds=closefds, |
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417 env=tonativeenv(env), |
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418 cwd=pycompat.rapply(tonativestr, cwd), |
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419 ) |
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420 else: |
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421 proc = subprocess.Popen( |
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422 tonativestr(cmd), |
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423 shell=True, |
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424 close_fds=closefds, |
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425 env=tonativeenv(env), |
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426 cwd=pycompat.rapply(tonativestr, cwd), |
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427 stdout=subprocess.PIPE, |
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428 stderr=subprocess.STDOUT, |
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429 ) |
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430 for line in iter(proc.stdout.readline, b''): |
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431 out.write(line) |
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432 proc.wait() |
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433 rc = proc.returncode |
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434 if pycompat.sysplatform == b'OpenVMS' and rc & 1: |
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435 rc = 0 |
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436 return rc |
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437 |
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438 |
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439 def gui(): |
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440 '''Are we running in a GUI?''' |
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442 if b'SSH_CONNECTION' in encoding.environ: |
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443 # handle SSH access to a box where the user is logged in |
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444 return False |
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445 elif getattr(osutil, 'isgui', None): |
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446 # check if a CoreGraphics session is available |
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447 return osutil.isgui() |
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448 else: |
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449 # pure build; use a safe default |
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450 return True |
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451 else: |
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452 return pycompat.iswindows or encoding.environ.get(b"DISPLAY") |
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453 |
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454 |
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455 def hgcmd(): |
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456 """Return the command used to execute current hg |
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457 |
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458 This is different from hgexecutable() because on Windows we want |
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459 to avoid things opening new shell windows like batch files, so we |
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460 get either the python call or current executable. |
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461 """ |
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462 if mainfrozen(): |
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463 if getattr(sys, 'frozen', None) == b'macosx_app': |
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464 # Env variable set by py2app |
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465 return [encoding.environ[b'EXECUTABLEPATH']] |
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466 else: |
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Pulkit Goyal <7895pulkit@gmail.com>
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467 return [pycompat.sysexecutable] |
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468 return _gethgcmd() |
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469 |
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470 |
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471 def rundetached(args, condfn): |
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472 """Execute the argument list in a detached process. |
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473 |
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474 condfn is a callable which is called repeatedly and should return |
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475 True once the child process is known to have started successfully. |
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476 At this point, the child process PID is returned. If the child |
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477 process fails to start or finishes before condfn() evaluates to |
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478 True, return -1. |
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479 """ |
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480 # Windows case is easier because the child process is either |
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481 # successfully starting and validating the condition or exiting |
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482 # on failure. We just poll on its PID. On Unix, if the child |
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483 # process fails to start, it will be left in a zombie state until |
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484 # the parent wait on it, which we cannot do since we expect a long |
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485 # running process on success. Instead we listen for SIGCHLD telling |
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486 # us our child process terminated. |
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487 terminated = set() |
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488 |
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489 def handler(signum, frame): |
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490 terminated.add(os.wait()) |
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491 |
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492 prevhandler = None |
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493 SIGCHLD = getattr(signal, 'SIGCHLD', None) |
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494 if SIGCHLD is not None: |
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495 prevhandler = signal.signal(SIGCHLD, handler) |
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496 try: |
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497 pid = spawndetached(args) |
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498 while not condfn(): |
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499 if (pid in terminated or not testpid(pid)) and not condfn(): |
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500 return -1 |
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501 time.sleep(0.1) |
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502 return pid |
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503 finally: |
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504 if prevhandler is not None: |
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505 signal.signal(signal.SIGCHLD, prevhandler) |
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506 |
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507 |
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508 @contextlib.contextmanager |
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509 def uninterruptible(warn): |
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510 """Inhibit SIGINT handling on a region of code. |
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511 |
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512 Note that if this is called in a non-main thread, it turns into a no-op. |
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513 |
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514 Args: |
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515 warn: A callable which takes no arguments, and returns True if the |
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516 previous signal handling should be restored. |
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517 """ |
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518 |
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519 oldsiginthandler = [signal.getsignal(signal.SIGINT)] |
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520 shouldbail = [] |
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521 |
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522 def disabledsiginthandler(*args): |
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523 if warn(): |
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524 signal.signal(signal.SIGINT, oldsiginthandler[0]) |
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525 del oldsiginthandler[0] |
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526 shouldbail.append(True) |
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527 |
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528 try: |
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529 try: |
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530 signal.signal(signal.SIGINT, disabledsiginthandler) |
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531 except ValueError: |
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532 # wrong thread, oh well, we tried |
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533 del oldsiginthandler[0] |
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534 yield |
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535 finally: |
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536 if oldsiginthandler: |
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537 signal.signal(signal.SIGINT, oldsiginthandler[0]) |
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538 if shouldbail: |
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539 raise KeyboardInterrupt |
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540 |
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541 |
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542 if pycompat.iswindows: |
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543 # no fork on Windows, but we can create a detached process |
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544 # https://msdn.microsoft.com/en-us/library/windows/desktop/ms684863.aspx |
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545 # No stdlib constant exists for this value |
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546 DETACHED_PROCESS = 0x00000008 |
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547 # Following creation flags might create a console GUI window. |
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548 # Using subprocess.CREATE_NEW_CONSOLE might helps. |
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549 # See https://phab.mercurial-scm.org/D1701 for discussion |
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550 _creationflags = ( |
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551 DETACHED_PROCESS |
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552 | subprocess.CREATE_NEW_PROCESS_GROUP # pytype: disable=module-attr |
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553 ) |
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554 |
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555 def runbgcommand( |
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556 script, env, shell=False, stdout=None, stderr=None, ensurestart=True |
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557 ): |
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558 '''Spawn a command without waiting for it to finish.''' |
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559 # we can't use close_fds *and* redirect stdin. I'm not sure that we |
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560 # need to because the detached process has no console connection. |
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561 subprocess.Popen( |
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562 tonativestr(script), |
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563 shell=shell, |
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564 env=tonativeenv(env), |
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565 close_fds=True, |
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566 creationflags=_creationflags, |
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567 stdout=stdout, |
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568 stderr=stderr, |
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569 ) |
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570 |
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571 |
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572 else: |
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573 |
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574 def runbgcommand( |
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575 cmd, env, shell=False, stdout=None, stderr=None, ensurestart=True |
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576 ): |
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577 '''Spawn a command without waiting for it to finish.''' |
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578 # double-fork to completely detach from the parent process |
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579 # based on http://code.activestate.com/recipes/278731 |
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580 pid = os.fork() |
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581 if pid: |
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582 if not ensurestart: |
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583 return |
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584 # Parent process |
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585 (_pid, status) = os.waitpid(pid, 0) |
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586 if os.WIFEXITED(status): |
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587 returncode = os.WEXITSTATUS(status) |
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588 else: |
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589 returncode = -(os.WTERMSIG(status)) |
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590 if returncode != 0: |
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591 # The child process's return code is 0 on success, an errno |
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592 # value on failure, or 255 if we don't have a valid errno |
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593 # value. |
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594 # |
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595 # (It would be slightly nicer to return the full exception info |
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596 # over a pipe as the subprocess module does. For now it |
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597 # doesn't seem worth adding that complexity here, though.) |
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598 if returncode == 255: |
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599 returncode = errno.EINVAL |
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600 raise OSError( |
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601 returncode, |
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602 b'error running %r: %s' % (cmd, os.strerror(returncode)), |
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603 ) |
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604 return |
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605 |
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606 returncode = 255 |
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607 try: |
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608 # Start a new session |
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609 os.setsid() |
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610 |
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611 stdin = open(os.devnull, b'r') |
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612 if stdout is None: |
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613 stdout = open(os.devnull, b'w') |
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614 if stderr is None: |
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615 stderr = open(os.devnull, b'w') |
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616 |
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617 # connect stdin to devnull to make sure the subprocess can't |
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618 # muck up that stream for mercurial. |
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619 subprocess.Popen( |
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620 cmd, |
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621 shell=shell, |
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622 env=env, |
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623 close_fds=True, |
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624 stdin=stdin, |
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625 stdout=stdout, |
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626 stderr=stderr, |
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627 ) |
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628 returncode = 0 |
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629 except EnvironmentError as ex: |
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630 returncode = ex.errno & 0xFF |
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631 if returncode == 0: |
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632 # This shouldn't happen, but just in case make sure the |
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633 # return code is never 0 here. |
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634 returncode = 255 |
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635 except Exception: |
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636 returncode = 255 |
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637 finally: |
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638 # mission accomplished, this child needs to exit and not |
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639 # continue the hg process here. |
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640 os._exit(returncode) |