Mercurial > hg
annotate mercurial/utils/procutil.py @ 43115:4aa72cdf616f
py3: delete b'' prefix from safehasattr arguments
Differential Revision: https://phab.mercurial-scm.org/D7029
author | Martin von Zweigbergk <martinvonz@google.com> |
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date | Sun, 06 Oct 2019 20:17:41 -0700 |
parents | d783f945a701 |
children | 227ba1afcb65 |
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 else: |
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57 stdout = os.fdopen(stdout.fileno(), r'wb', 1) |
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58 |
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60 from .. import windows as platform |
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61 |
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62 stdout = platform.winstdout(stdout) |
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63 else: |
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64 from .. import posix as platform |
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65 |
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66 findexe = platform.findexe |
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67 _gethgcmd = platform.gethgcmd |
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68 getuser = platform.getuser |
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69 getpid = os.getpid |
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70 hidewindow = platform.hidewindow |
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71 quotecommand = platform.quotecommand |
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72 readpipe = platform.readpipe |
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73 setbinary = platform.setbinary |
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74 setsignalhandler = platform.setsignalhandler |
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75 shellquote = platform.shellquote |
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76 shellsplit = platform.shellsplit |
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77 spawndetached = platform.spawndetached |
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78 sshargs = platform.sshargs |
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79 testpid = platform.testpid |
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80 |
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81 try: |
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82 setprocname = osutil.setprocname |
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83 except AttributeError: |
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84 pass |
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85 try: |
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86 unblocksignal = osutil.unblocksignal |
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87 except AttributeError: |
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88 pass |
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89 |
34646 | 90 closefds = pycompat.isposix |
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91 |
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92 |
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93 def explainexit(code): |
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94 """return a message describing a subprocess status |
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95 (codes from kill are negative - not os.system/wait encoding)""" |
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96 if code >= 0: |
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97 return _(b"exited with status %d") % code |
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98 return _(b"killed by signal %d") % -code |
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99 |
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100 |
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101 class _pfile(object): |
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102 """File-like wrapper for a stream opened by subprocess.Popen()""" |
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103 |
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104 def __init__(self, proc, fp): |
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105 self._proc = proc |
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106 self._fp = fp |
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107 |
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108 def close(self): |
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109 # unlike os.popen(), this returns an integer in subprocess coding |
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110 self._fp.close() |
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111 return self._proc.wait() |
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112 |
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113 def __iter__(self): |
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114 return iter(self._fp) |
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115 |
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116 def __getattr__(self, attr): |
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117 return getattr(self._fp, attr) |
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119 def __enter__(self): |
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120 return self |
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121 |
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122 def __exit__(self, exc_type, exc_value, exc_tb): |
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123 self.close() |
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124 |
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125 |
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126 def popen(cmd, mode=b'rb', bufsize=-1): |
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127 if mode == b'rb': |
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128 return _popenreader(cmd, bufsize) |
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129 elif mode == b'wb': |
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130 return _popenwriter(cmd, bufsize) |
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131 raise error.ProgrammingError(b'unsupported mode: %r' % mode) |
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132 |
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133 |
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134 def _popenreader(cmd, bufsize): |
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135 p = subprocess.Popen( |
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136 tonativestr(quotecommand(cmd)), |
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137 shell=True, |
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138 bufsize=bufsize, |
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139 close_fds=closefds, |
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140 stdout=subprocess.PIPE, |
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141 ) |
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142 return _pfile(p, p.stdout) |
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143 |
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144 |
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145 def _popenwriter(cmd, bufsize): |
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146 p = subprocess.Popen( |
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147 tonativestr(quotecommand(cmd)), |
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148 shell=True, |
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149 bufsize=bufsize, |
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150 close_fds=closefds, |
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151 stdin=subprocess.PIPE, |
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152 ) |
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153 return _pfile(p, p.stdin) |
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154 |
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155 |
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156 def popen2(cmd, env=None): |
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157 # Setting bufsize to -1 lets the system decide the buffer size. |
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158 # The default for bufsize is 0, meaning unbuffered. This leads to |
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159 # poor performance on Mac OS X: http://bugs.python.org/issue4194 |
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160 p = subprocess.Popen( |
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161 tonativestr(cmd), |
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162 shell=True, |
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163 bufsize=-1, |
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164 close_fds=closefds, |
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165 stdin=subprocess.PIPE, |
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166 stdout=subprocess.PIPE, |
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167 env=tonativeenv(env), |
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168 ) |
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169 return p.stdin, p.stdout |
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170 |
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171 |
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172 def popen3(cmd, env=None): |
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173 stdin, stdout, stderr, p = popen4(cmd, env) |
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174 return stdin, stdout, stderr |
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175 |
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176 |
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177 def popen4(cmd, env=None, bufsize=-1): |
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178 p = subprocess.Popen( |
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179 tonativestr(cmd), |
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180 shell=True, |
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181 bufsize=bufsize, |
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182 close_fds=closefds, |
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183 stdin=subprocess.PIPE, |
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184 stdout=subprocess.PIPE, |
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185 stderr=subprocess.PIPE, |
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186 env=tonativeenv(env), |
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187 ) |
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188 return p.stdin, p.stdout, p.stderr, p |
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189 |
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190 |
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191 def pipefilter(s, cmd): |
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192 '''filter string S through command CMD, returning its output''' |
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193 p = subprocess.Popen( |
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194 tonativestr(cmd), |
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195 shell=True, |
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196 close_fds=closefds, |
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197 stdin=subprocess.PIPE, |
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198 stdout=subprocess.PIPE, |
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199 ) |
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200 pout, perr = p.communicate(s) |
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201 return pout |
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202 |
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203 |
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204 def tempfilter(s, cmd): |
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205 '''filter string S through a pair of temporary files with CMD. |
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206 CMD is used as a template to create the real command to be run, |
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207 with the strings INFILE and OUTFILE replaced by the real names of |
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208 the temporary files generated.''' |
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209 inname, outname = None, None |
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210 try: |
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211 infd, inname = pycompat.mkstemp(prefix=b'hg-filter-in-') |
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212 fp = os.fdopen(infd, r'wb') |
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213 fp.write(s) |
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214 fp.close() |
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215 outfd, outname = pycompat.mkstemp(prefix=b'hg-filter-out-') |
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216 os.close(outfd) |
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217 cmd = cmd.replace(b'INFILE', inname) |
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218 cmd = cmd.replace(b'OUTFILE', outname) |
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219 code = system(cmd) |
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220 if pycompat.sysplatform == b'OpenVMS' and code & 1: |
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221 code = 0 |
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222 if code: |
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223 raise error.Abort( |
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224 _(b"command '%s' failed: %s") % (cmd, explainexit(code)) |
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225 ) |
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226 with open(outname, b'rb') as fp: |
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227 return fp.read() |
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228 finally: |
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229 try: |
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230 if inname: |
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231 os.unlink(inname) |
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232 except OSError: |
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233 pass |
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234 try: |
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235 if outname: |
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236 os.unlink(outname) |
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237 except OSError: |
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238 pass |
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239 |
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240 |
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241 _filtertable = { |
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242 b'tempfile:': tempfilter, |
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243 b'pipe:': pipefilter, |
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244 } |
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245 |
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246 |
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247 def filter(s, cmd): |
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248 b"filter a string through a command that transforms its input to its output" |
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249 for name, fn in pycompat.iteritems(_filtertable): |
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250 if cmd.startswith(name): |
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251 return fn(s, cmd[len(name) :].lstrip()) |
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252 return pipefilter(s, cmd) |
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253 |
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254 |
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255 def mainfrozen(): |
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256 """return True if we are a frozen executable. |
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257 |
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258 The code supports py2exe (most common, Windows only) and tools/freeze |
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259 (portable, not much used). |
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260 """ |
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261 return ( |
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262 pycompat.safehasattr(sys, "frozen") |
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263 or pycompat.safehasattr(sys, "importers") # new py2exe |
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264 or imp.is_frozen(r"__main__") # old py2exe |
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265 ) # tools/freeze |
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266 |
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267 |
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268 _hgexecutable = None |
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269 |
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270 |
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271 def hgexecutable(): |
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272 """return location of the 'hg' executable. |
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273 |
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274 Defaults to $HG or 'hg' in the search path. |
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275 """ |
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276 if _hgexecutable is None: |
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277 hg = encoding.environ.get(b'HG') |
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278 mainmod = sys.modules[r'__main__'] |
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280 _sethgexecutable(hg) |
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281 elif mainfrozen(): |
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282 if getattr(sys, 'frozen', None) == b'macosx_app': |
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283 # Env variable set by py2app |
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284 _sethgexecutable(encoding.environ[b'EXECUTABLEPATH']) |
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285 else: |
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286 _sethgexecutable(pycompat.sysexecutable) |
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287 elif ( |
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288 not pycompat.iswindows |
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289 and os.path.basename( |
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290 pycompat.fsencode(getattr(mainmod, '__file__', b'')) |
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291 ) |
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292 == b'hg' |
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293 ): |
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294 _sethgexecutable(pycompat.fsencode(mainmod.__file__)) |
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295 else: |
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296 _sethgexecutable( |
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297 findexe(b'hg') or os.path.basename(pycompat.sysargv[0]) |
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298 ) |
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299 return _hgexecutable |
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300 |
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301 |
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302 def _sethgexecutable(path): |
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303 """set location of the 'hg' executable""" |
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304 global _hgexecutable |
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305 _hgexecutable = path |
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306 |
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307 |
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308 def _testfileno(f, stdf): |
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309 fileno = getattr(f, 'fileno', None) |
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310 try: |
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311 return fileno and fileno() == stdf.fileno() |
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312 except io.UnsupportedOperation: |
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313 return False # fileno() raised UnsupportedOperation |
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314 |
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315 |
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316 def isstdin(f): |
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317 return _testfileno(f, sys.__stdin__) |
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318 |
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319 |
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320 def isstdout(f): |
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321 return _testfileno(f, sys.__stdout__) |
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322 |
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323 |
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324 def protectstdio(uin, uout): |
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325 """Duplicate streams and redirect original if (uin, uout) are stdio |
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326 |
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327 If uin is stdin, it's redirected to /dev/null. If uout is stdout, it's |
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328 redirected to stderr so the output is still readable. |
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329 |
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330 Returns (fin, fout) which point to the original (uin, uout) fds, but |
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331 may be copy of (uin, uout). The returned streams can be considered |
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332 "owned" in that print(), exec(), etc. never reach to them. |
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333 """ |
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334 uout.flush() |
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335 fin, fout = uin, uout |
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336 if _testfileno(uin, stdin): |
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337 newfd = os.dup(uin.fileno()) |
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338 nullfd = os.open(os.devnull, os.O_RDONLY) |
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339 os.dup2(nullfd, uin.fileno()) |
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340 os.close(nullfd) |
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341 fin = os.fdopen(newfd, r'rb') |
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342 if _testfileno(uout, stdout): |
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343 newfd = os.dup(uout.fileno()) |
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344 os.dup2(stderr.fileno(), uout.fileno()) |
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345 fout = os.fdopen(newfd, r'wb') |
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346 return fin, fout |
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347 |
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348 |
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349 def restorestdio(uin, uout, fin, fout): |
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350 """Restore (uin, uout) streams from possibly duplicated (fin, fout)""" |
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351 uout.flush() |
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352 for f, uif in [(fin, uin), (fout, uout)]: |
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353 if f is not uif: |
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354 os.dup2(f.fileno(), uif.fileno()) |
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355 f.close() |
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356 |
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357 |
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358 def shellenviron(environ=None): |
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359 """return environ with optional override, useful for shelling out""" |
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360 |
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361 def py2shell(val): |
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362 b'convert python object into string that is useful to shell' |
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363 if val is None or val is False: |
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364 return b'0' |
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365 if val is True: |
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366 return b'1' |
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367 return pycompat.bytestr(val) |
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368 |
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369 env = dict(encoding.environ) |
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370 if environ: |
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371 env.update((k, py2shell(v)) for k, v in pycompat.iteritems(environ)) |
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372 env[b'HG'] = hgexecutable() |
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373 return env |
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374 |
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375 |
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376 if pycompat.iswindows: |
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377 |
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378 def shelltonative(cmd, env): |
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379 return platform.shelltocmdexe(cmd, shellenviron(env)) |
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380 |
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381 tonativestr = encoding.strfromlocal |
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382 else: |
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383 |
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384 def shelltonative(cmd, env): |
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385 return cmd |
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386 |
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387 tonativestr = pycompat.identity |
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388 |
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389 |
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390 def tonativeenv(env): |
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391 '''convert the environment from bytes to strings suitable for Popen(), etc. |
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392 ''' |
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393 return pycompat.rapply(tonativestr, env) |
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394 |
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395 |
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396 def system(cmd, environ=None, cwd=None, out=None): |
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397 '''enhanced shell command execution. |
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398 run with environment maybe modified, maybe in different dir. |
508 | 399 |
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400 if out is specified, it is assumed to be a file-like object that has a |
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401 write() method. stdout and stderr will be redirected to out.''' |
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402 try: |
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403 stdout.flush() |
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404 except Exception: |
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405 pass |
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406 cmd = quotecommand(cmd) |
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407 env = shellenviron(environ) |
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408 if out is None or isstdout(out): |
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409 rc = subprocess.call( |
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410 tonativestr(cmd), |
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411 shell=True, |
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412 close_fds=closefds, |
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413 env=tonativeenv(env), |
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414 cwd=pycompat.rapply(tonativestr, cwd), |
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415 ) |
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416 else: |
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417 proc = subprocess.Popen( |
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418 tonativestr(cmd), |
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419 shell=True, |
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420 close_fds=closefds, |
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421 env=tonativeenv(env), |
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422 cwd=pycompat.rapply(tonativestr, cwd), |
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423 stdout=subprocess.PIPE, |
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424 stderr=subprocess.STDOUT, |
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425 ) |
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426 for line in iter(proc.stdout.readline, b''): |
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427 out.write(line) |
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428 proc.wait() |
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429 rc = proc.returncode |
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430 if pycompat.sysplatform == b'OpenVMS' and rc & 1: |
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431 rc = 0 |
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432 return rc |
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433 |
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434 |
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435 def gui(): |
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436 '''Are we running in a GUI?''' |
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438 if b'SSH_CONNECTION' in encoding.environ: |
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439 # handle SSH access to a box where the user is logged in |
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440 return False |
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441 elif getattr(osutil, 'isgui', None): |
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442 # check if a CoreGraphics session is available |
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443 return osutil.isgui() |
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444 else: |
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445 # pure build; use a safe default |
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446 return True |
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447 else: |
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448 return pycompat.iswindows or encoding.environ.get(b"DISPLAY") |
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449 |
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450 |
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451 def hgcmd(): |
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452 """Return the command used to execute current hg |
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453 |
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454 This is different from hgexecutable() because on Windows we want |
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455 to avoid things opening new shell windows like batch files, so we |
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456 get either the python call or current executable. |
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457 """ |
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458 if mainfrozen(): |
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459 if getattr(sys, 'frozen', None) == b'macosx_app': |
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460 # Env variable set by py2app |
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461 return [encoding.environ[b'EXECUTABLEPATH']] |
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462 else: |
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463 return [pycompat.sysexecutable] |
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464 return _gethgcmd() |
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465 |
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466 |
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467 def rundetached(args, condfn): |
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468 """Execute the argument list in a detached process. |
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469 |
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470 condfn is a callable which is called repeatedly and should return |
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471 True once the child process is known to have started successfully. |
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472 At this point, the child process PID is returned. If the child |
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473 process fails to start or finishes before condfn() evaluates to |
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474 True, return -1. |
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475 """ |
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476 # Windows case is easier because the child process is either |
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477 # successfully starting and validating the condition or exiting |
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478 # on failure. We just poll on its PID. On Unix, if the child |
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479 # process fails to start, it will be left in a zombie state until |
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480 # the parent wait on it, which we cannot do since we expect a long |
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481 # running process on success. Instead we listen for SIGCHLD telling |
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482 # us our child process terminated. |
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483 terminated = set() |
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484 |
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485 def handler(signum, frame): |
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486 terminated.add(os.wait()) |
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487 |
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488 prevhandler = None |
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489 SIGCHLD = getattr(signal, 'SIGCHLD', None) |
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490 if SIGCHLD is not None: |
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491 prevhandler = signal.signal(SIGCHLD, handler) |
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492 try: |
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493 pid = spawndetached(args) |
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494 while not condfn(): |
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495 if (pid in terminated or not testpid(pid)) and not condfn(): |
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496 return -1 |
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497 time.sleep(0.1) |
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498 return pid |
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499 finally: |
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500 if prevhandler is not None: |
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501 signal.signal(signal.SIGCHLD, prevhandler) |
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502 |
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503 |
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504 @contextlib.contextmanager |
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505 def uninterruptible(warn): |
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506 """Inhibit SIGINT handling on a region of code. |
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507 |
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508 Note that if this is called in a non-main thread, it turns into a no-op. |
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509 |
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510 Args: |
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511 warn: A callable which takes no arguments, and returns True if the |
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512 previous signal handling should be restored. |
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513 """ |
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514 |
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515 oldsiginthandler = [signal.getsignal(signal.SIGINT)] |
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516 shouldbail = [] |
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517 |
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518 def disabledsiginthandler(*args): |
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519 if warn(): |
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520 signal.signal(signal.SIGINT, oldsiginthandler[0]) |
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521 del oldsiginthandler[0] |
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522 shouldbail.append(True) |
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523 |
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524 try: |
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525 try: |
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526 signal.signal(signal.SIGINT, disabledsiginthandler) |
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527 except ValueError: |
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528 # wrong thread, oh well, we tried |
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529 del oldsiginthandler[0] |
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530 yield |
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531 finally: |
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532 if oldsiginthandler: |
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533 signal.signal(signal.SIGINT, oldsiginthandler[0]) |
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534 if shouldbail: |
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535 raise KeyboardInterrupt |
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536 |
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537 |
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538 if pycompat.iswindows: |
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539 # no fork on Windows, but we can create a detached process |
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540 # https://msdn.microsoft.com/en-us/library/windows/desktop/ms684863.aspx |
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541 # No stdlib constant exists for this value |
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542 DETACHED_PROCESS = 0x00000008 |
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543 # Following creation flags might create a console GUI window. |
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544 # Using subprocess.CREATE_NEW_CONSOLE might helps. |
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545 # See https://phab.mercurial-scm.org/D1701 for discussion |
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546 _creationflags = DETACHED_PROCESS | subprocess.CREATE_NEW_PROCESS_GROUP |
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547 |
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548 def runbgcommand( |
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549 script, env, shell=False, stdout=None, stderr=None, ensurestart=True |
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550 ): |
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551 '''Spawn a command without waiting for it to finish.''' |
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552 # we can't use close_fds *and* redirect stdin. I'm not sure that we |
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553 # need to because the detached process has no console connection. |
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554 subprocess.Popen( |
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555 tonativestr(script), |
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556 shell=shell, |
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557 env=tonativeenv(env), |
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558 close_fds=True, |
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559 creationflags=_creationflags, |
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560 stdout=stdout, |
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561 stderr=stderr, |
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562 ) |
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563 |
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564 |
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565 else: |
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566 |
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567 def runbgcommand( |
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568 cmd, env, shell=False, stdout=None, stderr=None, ensurestart=True |
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569 ): |
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570 '''Spawn a command without waiting for it to finish.''' |
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571 # double-fork to completely detach from the parent process |
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572 # based on http://code.activestate.com/recipes/278731 |
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573 pid = os.fork() |
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574 if pid: |
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575 if not ensurestart: |
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576 return |
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577 # Parent process |
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578 (_pid, status) = os.waitpid(pid, 0) |
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579 if os.WIFEXITED(status): |
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580 returncode = os.WEXITSTATUS(status) |
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581 else: |
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582 returncode = -(os.WTERMSIG(status)) |
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583 if returncode != 0: |
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584 # The child process's return code is 0 on success, an errno |
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585 # value on failure, or 255 if we don't have a valid errno |
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586 # value. |
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587 # |
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588 # (It would be slightly nicer to return the full exception info |
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589 # over a pipe as the subprocess module does. For now it |
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590 # doesn't seem worth adding that complexity here, though.) |
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591 if returncode == 255: |
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592 returncode = errno.EINVAL |
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593 raise OSError( |
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594 returncode, |
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595 b'error running %r: %s' % (cmd, os.strerror(returncode)), |
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596 ) |
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597 return |
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598 |
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599 returncode = 255 |
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600 try: |
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601 # Start a new session |
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602 os.setsid() |
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603 |
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604 stdin = open(os.devnull, b'r') |
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605 if stdout is None: |
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606 stdout = open(os.devnull, b'w') |
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607 if stderr is None: |
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608 stderr = open(os.devnull, b'w') |
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609 |
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610 # connect stdin to devnull to make sure the subprocess can't |
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611 # muck up that stream for mercurial. |
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612 subprocess.Popen( |
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613 cmd, |
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614 shell=shell, |
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615 env=env, |
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616 close_fds=True, |
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617 stdin=stdin, |
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618 stdout=stdout, |
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619 stderr=stderr, |
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620 ) |
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621 returncode = 0 |
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622 except EnvironmentError as ex: |
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623 returncode = ex.errno & 0xFF |
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624 if returncode == 0: |
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625 # This shouldn't happen, but just in case make sure the |
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626 # return code is never 0 here. |
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627 returncode = 255 |
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628 except Exception: |
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629 returncode = 255 |
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630 finally: |
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631 # mission accomplished, this child needs to exit and not |
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632 # continue the hg process here. |
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633 os._exit(returncode) |