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@@ -1,407 +1,411 b'' | |||
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1 | 1 | # procutil.py - utility for managing processes and executable environment |
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2 | 2 | # |
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3 | 3 | # Copyright 2005 K. Thananchayan <thananck@yahoo.com> |
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4 | 4 | # Copyright 2005-2007 Matt Mackall <mpm@selenic.com> |
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5 | 5 | # Copyright 2006 Vadim Gelfer <vadim.gelfer@gmail.com> |
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6 | 6 | # |
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7 | 7 | # This software may be used and distributed according to the terms of the |
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8 | 8 | # GNU General Public License version 2 or any later version. |
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9 | 9 | |
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10 | 10 | from __future__ import absolute_import |
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11 | 11 | |
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12 | 12 | import contextlib |
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13 | 13 | import imp |
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14 | 14 | import io |
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15 | 15 | import os |
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16 | 16 | import signal |
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17 | 17 | import subprocess |
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18 | 18 | import sys |
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19 | 19 | import tempfile |
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20 | 20 | import time |
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21 | 21 | |
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22 | 22 | from ..i18n import _ |
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23 | 23 | |
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24 | 24 | from .. import ( |
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25 | 25 | encoding, |
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26 | 26 | error, |
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27 | 27 | policy, |
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28 | 28 | pycompat, |
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29 | 29 | ) |
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30 | 30 | |
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31 | 31 | osutil = policy.importmod(r'osutil') |
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32 | 32 | |
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33 | 33 | stderr = pycompat.stderr |
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34 | 34 | stdin = pycompat.stdin |
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35 | 35 | stdout = pycompat.stdout |
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36 | 36 | |
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37 | 37 | def isatty(fp): |
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38 | 38 | try: |
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39 | 39 | return fp.isatty() |
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40 | 40 | except AttributeError: |
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41 | 41 | return False |
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42 | 42 | |
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43 | 43 | # glibc determines buffering on first write to stdout - if we replace a TTY |
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44 | 44 | # destined stdout with a pipe destined stdout (e.g. pager), we want line |
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45 | # buffering | |
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45 | # buffering (or unbuffered, on Windows) | |
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46 | 46 | if isatty(stdout): |
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47 | if pycompat.iswindows: | |
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48 | # Windows doesn't support line buffering | |
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49 | stdout = os.fdopen(stdout.fileno(), r'wb', 0) | |
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50 | else: | |
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47 | 51 | stdout = os.fdopen(stdout.fileno(), r'wb', 1) |
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48 | 52 | |
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49 | 53 | if pycompat.iswindows: |
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50 | 54 | from .. import windows as platform |
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51 | 55 | stdout = platform.winstdout(stdout) |
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52 | 56 | else: |
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53 | 57 | from .. import posix as platform |
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54 | 58 | |
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55 | 59 | findexe = platform.findexe |
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56 | 60 | _gethgcmd = platform.gethgcmd |
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57 | 61 | getuser = platform.getuser |
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58 | 62 | getpid = os.getpid |
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59 | 63 | hidewindow = platform.hidewindow |
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60 | 64 | quotecommand = platform.quotecommand |
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61 | 65 | readpipe = platform.readpipe |
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62 | 66 | setbinary = platform.setbinary |
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63 | 67 | setsignalhandler = platform.setsignalhandler |
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64 | 68 | shellquote = platform.shellquote |
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65 | 69 | shellsplit = platform.shellsplit |
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66 | 70 | spawndetached = platform.spawndetached |
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67 | 71 | sshargs = platform.sshargs |
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68 | 72 | testpid = platform.testpid |
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69 | 73 | |
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70 | 74 | try: |
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71 | 75 | setprocname = osutil.setprocname |
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72 | 76 | except AttributeError: |
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73 | 77 | pass |
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74 | 78 | try: |
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75 | 79 | unblocksignal = osutil.unblocksignal |
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76 | 80 | except AttributeError: |
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77 | 81 | pass |
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78 | 82 | |
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79 | 83 | closefds = pycompat.isposix |
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80 | 84 | |
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81 | 85 | def explainexit(code): |
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82 | 86 | """return a message describing a subprocess status |
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83 | 87 | (codes from kill are negative - not os.system/wait encoding)""" |
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84 | 88 | if code >= 0: |
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85 | 89 | return _("exited with status %d") % code |
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86 | 90 | return _("killed by signal %d") % -code |
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87 | 91 | |
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88 | 92 | class _pfile(object): |
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89 | 93 | """File-like wrapper for a stream opened by subprocess.Popen()""" |
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90 | 94 | |
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91 | 95 | def __init__(self, proc, fp): |
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92 | 96 | self._proc = proc |
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93 | 97 | self._fp = fp |
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94 | 98 | |
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95 | 99 | def close(self): |
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96 | 100 | # unlike os.popen(), this returns an integer in subprocess coding |
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97 | 101 | self._fp.close() |
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98 | 102 | return self._proc.wait() |
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99 | 103 | |
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100 | 104 | def __iter__(self): |
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101 | 105 | return iter(self._fp) |
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102 | 106 | |
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103 | 107 | def __getattr__(self, attr): |
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104 | 108 | return getattr(self._fp, attr) |
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105 | 109 | |
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106 | 110 | def __enter__(self): |
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107 | 111 | return self |
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108 | 112 | |
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109 | 113 | def __exit__(self, exc_type, exc_value, exc_tb): |
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110 | 114 | self.close() |
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111 | 115 | |
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112 | 116 | def popen(cmd, mode='rb', bufsize=-1): |
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113 | 117 | if mode == 'rb': |
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114 | 118 | return _popenreader(cmd, bufsize) |
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115 | 119 | elif mode == 'wb': |
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116 | 120 | return _popenwriter(cmd, bufsize) |
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117 | 121 | raise error.ProgrammingError('unsupported mode: %r' % mode) |
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118 | 122 | |
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119 | 123 | def _popenreader(cmd, bufsize): |
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120 | 124 | p = subprocess.Popen(quotecommand(cmd), shell=True, bufsize=bufsize, |
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121 | 125 | close_fds=closefds, |
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122 | 126 | stdout=subprocess.PIPE) |
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123 | 127 | return _pfile(p, p.stdout) |
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124 | 128 | |
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125 | 129 | def _popenwriter(cmd, bufsize): |
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126 | 130 | p = subprocess.Popen(quotecommand(cmd), shell=True, bufsize=bufsize, |
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127 | 131 | close_fds=closefds, |
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128 | 132 | stdin=subprocess.PIPE) |
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129 | 133 | return _pfile(p, p.stdin) |
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130 | 134 | |
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131 | 135 | def popen2(cmd, env=None): |
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132 | 136 | # Setting bufsize to -1 lets the system decide the buffer size. |
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133 | 137 | # The default for bufsize is 0, meaning unbuffered. This leads to |
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134 | 138 | # poor performance on Mac OS X: http://bugs.python.org/issue4194 |
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135 | 139 | p = subprocess.Popen(cmd, shell=True, bufsize=-1, |
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136 | 140 | close_fds=closefds, |
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137 | 141 | stdin=subprocess.PIPE, stdout=subprocess.PIPE, |
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138 | 142 | env=env) |
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139 | 143 | return p.stdin, p.stdout |
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140 | 144 | |
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141 | 145 | def popen3(cmd, env=None): |
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142 | 146 | stdin, stdout, stderr, p = popen4(cmd, env) |
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143 | 147 | return stdin, stdout, stderr |
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144 | 148 | |
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145 | 149 | def popen4(cmd, env=None, bufsize=-1): |
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146 | 150 | p = subprocess.Popen(cmd, shell=True, bufsize=bufsize, |
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147 | 151 | close_fds=closefds, |
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148 | 152 | stdin=subprocess.PIPE, stdout=subprocess.PIPE, |
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149 | 153 | stderr=subprocess.PIPE, |
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150 | 154 | env=env) |
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151 | 155 | return p.stdin, p.stdout, p.stderr, p |
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152 | 156 | |
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153 | 157 | def pipefilter(s, cmd): |
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154 | 158 | '''filter string S through command CMD, returning its output''' |
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155 | 159 | p = subprocess.Popen(cmd, shell=True, close_fds=closefds, |
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156 | 160 | stdin=subprocess.PIPE, stdout=subprocess.PIPE) |
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157 | 161 | pout, perr = p.communicate(s) |
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158 | 162 | return pout |
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159 | 163 | |
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160 | 164 | def tempfilter(s, cmd): |
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161 | 165 | '''filter string S through a pair of temporary files with CMD. |
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162 | 166 | CMD is used as a template to create the real command to be run, |
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163 | 167 | with the strings INFILE and OUTFILE replaced by the real names of |
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164 | 168 | the temporary files generated.''' |
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165 | 169 | inname, outname = None, None |
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166 | 170 | try: |
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167 | 171 | infd, inname = tempfile.mkstemp(prefix='hg-filter-in-') |
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168 | 172 | fp = os.fdopen(infd, r'wb') |
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169 | 173 | fp.write(s) |
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170 | 174 | fp.close() |
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171 | 175 | outfd, outname = tempfile.mkstemp(prefix='hg-filter-out-') |
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172 | 176 | os.close(outfd) |
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173 | 177 | cmd = cmd.replace('INFILE', inname) |
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174 | 178 | cmd = cmd.replace('OUTFILE', outname) |
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175 | 179 | code = system(cmd) |
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176 | 180 | if pycompat.sysplatform == 'OpenVMS' and code & 1: |
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177 | 181 | code = 0 |
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178 | 182 | if code: |
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179 | 183 | raise error.Abort(_("command '%s' failed: %s") % |
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180 | 184 | (cmd, explainexit(code))) |
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181 | 185 | with open(outname, 'rb') as fp: |
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182 | 186 | return fp.read() |
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183 | 187 | finally: |
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184 | 188 | try: |
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185 | 189 | if inname: |
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186 | 190 | os.unlink(inname) |
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187 | 191 | except OSError: |
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188 | 192 | pass |
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189 | 193 | try: |
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190 | 194 | if outname: |
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191 | 195 | os.unlink(outname) |
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192 | 196 | except OSError: |
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193 | 197 | pass |
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194 | 198 | |
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195 | 199 | _filtertable = { |
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196 | 200 | 'tempfile:': tempfilter, |
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197 | 201 | 'pipe:': pipefilter, |
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198 | 202 | } |
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199 | 203 | |
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200 | 204 | def filter(s, cmd): |
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201 | 205 | "filter a string through a command that transforms its input to its output" |
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202 | 206 | for name, fn in _filtertable.iteritems(): |
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203 | 207 | if cmd.startswith(name): |
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204 | 208 | return fn(s, cmd[len(name):].lstrip()) |
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205 | 209 | return pipefilter(s, cmd) |
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206 | 210 | |
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207 | 211 | def mainfrozen(): |
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208 | 212 | """return True if we are a frozen executable. |
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209 | 213 | |
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210 | 214 | The code supports py2exe (most common, Windows only) and tools/freeze |
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211 | 215 | (portable, not much used). |
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212 | 216 | """ |
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213 | 217 | return (pycompat.safehasattr(sys, "frozen") or # new py2exe |
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214 | 218 | pycompat.safehasattr(sys, "importers") or # old py2exe |
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215 | 219 | imp.is_frozen(u"__main__")) # tools/freeze |
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216 | 220 | |
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217 | 221 | _hgexecutable = None |
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218 | 222 | |
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219 | 223 | def hgexecutable(): |
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220 | 224 | """return location of the 'hg' executable. |
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221 | 225 | |
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222 | 226 | Defaults to $HG or 'hg' in the search path. |
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223 | 227 | """ |
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224 | 228 | if _hgexecutable is None: |
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225 | 229 | hg = encoding.environ.get('HG') |
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226 | 230 | mainmod = sys.modules[r'__main__'] |
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227 | 231 | if hg: |
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228 | 232 | _sethgexecutable(hg) |
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229 | 233 | elif mainfrozen(): |
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230 | 234 | if getattr(sys, 'frozen', None) == 'macosx_app': |
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231 | 235 | # Env variable set by py2app |
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232 | 236 | _sethgexecutable(encoding.environ['EXECUTABLEPATH']) |
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233 | 237 | else: |
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234 | 238 | _sethgexecutable(pycompat.sysexecutable) |
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235 | 239 | elif (os.path.basename( |
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236 | 240 | pycompat.fsencode(getattr(mainmod, '__file__', ''))) == 'hg'): |
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237 | 241 | _sethgexecutable(pycompat.fsencode(mainmod.__file__)) |
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238 | 242 | else: |
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239 | 243 | exe = findexe('hg') or os.path.basename(sys.argv[0]) |
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240 | 244 | _sethgexecutable(exe) |
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241 | 245 | return _hgexecutable |
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242 | 246 | |
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243 | 247 | def _sethgexecutable(path): |
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244 | 248 | """set location of the 'hg' executable""" |
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245 | 249 | global _hgexecutable |
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246 | 250 | _hgexecutable = path |
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247 | 251 | |
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248 | 252 | def _testfileno(f, stdf): |
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249 | 253 | fileno = getattr(f, 'fileno', None) |
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250 | 254 | try: |
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251 | 255 | return fileno and fileno() == stdf.fileno() |
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252 | 256 | except io.UnsupportedOperation: |
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253 | 257 | return False # fileno() raised UnsupportedOperation |
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254 | 258 | |
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255 | 259 | def isstdin(f): |
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256 | 260 | return _testfileno(f, sys.__stdin__) |
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257 | 261 | |
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258 | 262 | def isstdout(f): |
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259 | 263 | return _testfileno(f, sys.__stdout__) |
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260 | 264 | |
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261 | 265 | def protectstdio(uin, uout): |
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262 | 266 | """Duplicate streams and redirect original if (uin, uout) are stdio |
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263 | 267 | |
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264 | 268 | If uin is stdin, it's redirected to /dev/null. If uout is stdout, it's |
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265 | 269 | redirected to stderr so the output is still readable. |
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266 | 270 | |
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267 | 271 | Returns (fin, fout) which point to the original (uin, uout) fds, but |
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268 | 272 | may be copy of (uin, uout). The returned streams can be considered |
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269 | 273 | "owned" in that print(), exec(), etc. never reach to them. |
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270 | 274 | """ |
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271 | 275 | uout.flush() |
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272 | 276 | fin, fout = uin, uout |
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273 | 277 | if uin is stdin: |
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274 | 278 | newfd = os.dup(uin.fileno()) |
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275 | 279 | nullfd = os.open(os.devnull, os.O_RDONLY) |
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276 | 280 | os.dup2(nullfd, uin.fileno()) |
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277 | 281 | os.close(nullfd) |
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278 | 282 | fin = os.fdopen(newfd, r'rb') |
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279 | 283 | if uout is stdout: |
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280 | 284 | newfd = os.dup(uout.fileno()) |
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281 | 285 | os.dup2(stderr.fileno(), uout.fileno()) |
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282 | 286 | fout = os.fdopen(newfd, r'wb') |
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283 | 287 | return fin, fout |
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284 | 288 | |
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285 | 289 | def restorestdio(uin, uout, fin, fout): |
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286 | 290 | """Restore (uin, uout) streams from possibly duplicated (fin, fout)""" |
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287 | 291 | uout.flush() |
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288 | 292 | for f, uif in [(fin, uin), (fout, uout)]: |
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289 | 293 | if f is not uif: |
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290 | 294 | os.dup2(f.fileno(), uif.fileno()) |
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291 | 295 | f.close() |
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292 | 296 | |
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293 | 297 | @contextlib.contextmanager |
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294 | 298 | def protectedstdio(uin, uout): |
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295 | 299 | """Run code block with protected standard streams""" |
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296 | 300 | fin, fout = protectstdio(uin, uout) |
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297 | 301 | try: |
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298 | 302 | yield fin, fout |
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299 | 303 | finally: |
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300 | 304 | restorestdio(uin, uout, fin, fout) |
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301 | 305 | |
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302 | 306 | def shellenviron(environ=None): |
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303 | 307 | """return environ with optional override, useful for shelling out""" |
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304 | 308 | def py2shell(val): |
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305 | 309 | 'convert python object into string that is useful to shell' |
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306 | 310 | if val is None or val is False: |
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307 | 311 | return '0' |
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308 | 312 | if val is True: |
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309 | 313 | return '1' |
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310 | 314 | return pycompat.bytestr(val) |
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311 | 315 | env = dict(encoding.environ) |
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312 | 316 | if environ: |
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313 | 317 | env.update((k, py2shell(v)) for k, v in environ.iteritems()) |
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314 | 318 | env['HG'] = hgexecutable() |
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315 | 319 | return env |
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316 | 320 | |
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317 | 321 | def system(cmd, environ=None, cwd=None, out=None): |
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318 | 322 | '''enhanced shell command execution. |
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319 | 323 | run with environment maybe modified, maybe in different dir. |
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320 | 324 | |
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321 | 325 | if out is specified, it is assumed to be a file-like object that has a |
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322 | 326 | write() method. stdout and stderr will be redirected to out.''' |
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323 | 327 | try: |
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324 | 328 | stdout.flush() |
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325 | 329 | except Exception: |
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326 | 330 | pass |
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327 | 331 | cmd = quotecommand(cmd) |
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328 | 332 | env = shellenviron(environ) |
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329 | 333 | if out is None or isstdout(out): |
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330 | 334 | rc = subprocess.call(cmd, shell=True, close_fds=closefds, |
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331 | 335 | env=env, cwd=cwd) |
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332 | 336 | else: |
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333 | 337 | proc = subprocess.Popen(cmd, shell=True, close_fds=closefds, |
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334 | 338 | env=env, cwd=cwd, stdout=subprocess.PIPE, |
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335 | 339 | stderr=subprocess.STDOUT) |
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336 | 340 | for line in iter(proc.stdout.readline, ''): |
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337 | 341 | out.write(line) |
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338 | 342 | proc.wait() |
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339 | 343 | rc = proc.returncode |
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340 | 344 | if pycompat.sysplatform == 'OpenVMS' and rc & 1: |
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341 | 345 | rc = 0 |
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342 | 346 | return rc |
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343 | 347 | |
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344 | 348 | def gui(): |
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345 | 349 | '''Are we running in a GUI?''' |
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346 | 350 | if pycompat.isdarwin: |
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347 | 351 | if 'SSH_CONNECTION' in encoding.environ: |
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348 | 352 | # handle SSH access to a box where the user is logged in |
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349 | 353 | return False |
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350 | 354 | elif getattr(osutil, 'isgui', None): |
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351 | 355 | # check if a CoreGraphics session is available |
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352 | 356 | return osutil.isgui() |
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353 | 357 | else: |
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354 | 358 | # pure build; use a safe default |
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355 | 359 | return True |
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356 | 360 | else: |
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357 | 361 | return pycompat.iswindows or encoding.environ.get("DISPLAY") |
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358 | 362 | |
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359 | 363 | def hgcmd(): |
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360 | 364 | """Return the command used to execute current hg |
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361 | 365 | |
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362 | 366 | This is different from hgexecutable() because on Windows we want |
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363 | 367 | to avoid things opening new shell windows like batch files, so we |
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364 | 368 | get either the python call or current executable. |
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365 | 369 | """ |
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366 | 370 | if mainfrozen(): |
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367 | 371 | if getattr(sys, 'frozen', None) == 'macosx_app': |
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368 | 372 | # Env variable set by py2app |
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369 | 373 | return [encoding.environ['EXECUTABLEPATH']] |
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370 | 374 | else: |
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371 | 375 | return [pycompat.sysexecutable] |
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372 | 376 | return _gethgcmd() |
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373 | 377 | |
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374 | 378 | def rundetached(args, condfn): |
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375 | 379 | """Execute the argument list in a detached process. |
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376 | 380 | |
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377 | 381 | condfn is a callable which is called repeatedly and should return |
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378 | 382 | True once the child process is known to have started successfully. |
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379 | 383 | At this point, the child process PID is returned. If the child |
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380 | 384 | process fails to start or finishes before condfn() evaluates to |
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381 | 385 | True, return -1. |
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382 | 386 | """ |
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383 | 387 | # Windows case is easier because the child process is either |
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384 | 388 | # successfully starting and validating the condition or exiting |
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385 | 389 | # on failure. We just poll on its PID. On Unix, if the child |
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386 | 390 | # process fails to start, it will be left in a zombie state until |
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387 | 391 | # the parent wait on it, which we cannot do since we expect a long |
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388 | 392 | # running process on success. Instead we listen for SIGCHLD telling |
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389 | 393 | # us our child process terminated. |
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390 | 394 | terminated = set() |
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391 | 395 | def handler(signum, frame): |
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392 | 396 | terminated.add(os.wait()) |
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393 | 397 | prevhandler = None |
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394 | 398 | SIGCHLD = getattr(signal, 'SIGCHLD', None) |
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395 | 399 | if SIGCHLD is not None: |
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396 | 400 | prevhandler = signal.signal(SIGCHLD, handler) |
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397 | 401 | try: |
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398 | 402 | pid = spawndetached(args) |
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399 | 403 | while not condfn(): |
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400 | 404 | if ((pid in terminated or not testpid(pid)) |
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401 | 405 | and not condfn()): |
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402 | 406 | return -1 |
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403 | 407 | time.sleep(0.1) |
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404 | 408 | return pid |
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405 | 409 | finally: |
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406 | 410 | if prevhandler is not None: |
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407 | 411 | signal.signal(signal.SIGCHLD, prevhandler) |
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