Mercurial > hg
annotate mercurial/chgserver.py @ 39809:23a00bc90a3c stable
chgserver: do not send system() back to client if stdio redirected (issue5992)
As the chg client doesn't know server-side stdio redirection, the server
shouldn't upcall on "runsystem" request if the stdio streams are redirected.
This patch teaches ui to remember the redirection flag, which is updated by
the caller right now. Future patches (for default) will add ui methods to
manage this flag internally.
author | Yuya Nishihara <yuya@tcha.org> |
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date | Wed, 26 Sep 2018 21:24:14 +0900 |
parents | 1b9be0b26511 |
children | a9f56e4501c1 |
rev | line source |
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1 # chgserver.py - command server extension for cHg |
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2 # |
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3 # Copyright 2011 Yuya Nishihara <yuya@tcha.org> |
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4 # |
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5 # This software may be used and distributed according to the terms of the |
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6 # GNU General Public License version 2 or any later version. |
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7 |
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8 """command server extension for cHg |
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9 |
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10 'S' channel (read/write) |
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11 propagate ui.system() request to client |
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12 |
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13 'attachio' command |
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14 attach client's stdio passed by sendmsg() |
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15 |
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16 'chdir' command |
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17 change current directory |
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18 |
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19 'setenv' command |
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20 replace os.environ completely |
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21 |
28325 | 22 'setumask' command |
23 set umask | |
24 | |
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25 'validate' command |
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26 reload the config and check if the server is up to date |
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27 |
28325 | 28 Config |
29 ------ | |
30 | |
31 :: | |
32 | |
33 [chgserver] | |
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34 # how long (in seconds) should an idle chg server exit |
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35 idletimeout = 3600 |
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36 |
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37 # whether to skip config or env change checks |
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38 skiphash = False |
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39 """ |
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40 |
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41 from __future__ import absolute_import |
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42 |
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43 import hashlib |
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44 import inspect |
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45 import os |
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46 import re |
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47 import socket |
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48 import stat |
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49 import struct |
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50 import time |
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51 |
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52 from .i18n import _ |
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53 |
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54 from . import ( |
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55 commandserver, |
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56 encoding, |
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57 error, |
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58 extensions, |
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59 node, |
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60 pycompat, |
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61 util, |
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62 ) |
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63 |
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64 from .utils import ( |
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65 procutil, |
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66 ) |
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67 |
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68 _log = commandserver.log |
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69 |
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70 def _hashlist(items): |
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71 """return sha1 hexdigest for a list""" |
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72 return node.hex(hashlib.sha1(str(items)).digest()) |
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73 |
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74 # sensitive config sections affecting confighash |
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75 _configsections = [ |
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76 'alias', # affects global state commands.table |
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77 'eol', # uses setconfig('eol', ...) |
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78 'extdiff', # uisetup will register new commands |
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79 'extensions', |
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80 ] |
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81 |
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82 _configsectionitems = [ |
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83 ('commands', 'show.aliasprefix'), # show.py reads it in extsetup |
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84 ] |
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85 |
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86 # sensitive environment variables affecting confighash |
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87 _envre = re.compile(r'''\A(?: |
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88 CHGHG |
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89 |HG(?:DEMANDIMPORT|EMITWARNINGS|MODULEPOLICY|PROF|RCPATH)? |
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90 |HG(?:ENCODING|PLAIN).* |
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91 |LANG(?:UAGE)? |
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92 |LC_.* |
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93 |LD_.* |
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94 |PATH |
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95 |PYTHON.* |
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96 |TERM(?:INFO)? |
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97 |TZ |
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98 )\Z''', re.X) |
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99 |
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100 def _confighash(ui): |
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101 """return a quick hash for detecting config/env changes |
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102 |
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103 confighash is the hash of sensitive config items and environment variables. |
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104 |
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105 for chgserver, it is designed that once confighash changes, the server is |
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106 not qualified to serve its client and should redirect the client to a new |
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107 server. different from mtimehash, confighash change will not mark the |
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108 server outdated and exit since the user can have different configs at the |
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109 same time. |
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110 """ |
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111 sectionitems = [] |
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112 for section in _configsections: |
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113 sectionitems.append(ui.configitems(section)) |
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114 for section, item in _configsectionitems: |
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115 sectionitems.append(ui.config(section, item)) |
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116 sectionhash = _hashlist(sectionitems) |
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117 # If $CHGHG is set, the change to $HG should not trigger a new chg server |
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118 if 'CHGHG' in encoding.environ: |
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119 ignored = {'HG'} |
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120 else: |
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121 ignored = set() |
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122 envitems = [(k, v) for k, v in encoding.environ.iteritems() |
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123 if _envre.match(k) and k not in ignored] |
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124 envhash = _hashlist(sorted(envitems)) |
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125 return sectionhash[:6] + envhash[:6] |
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126 |
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127 def _getmtimepaths(ui): |
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128 """get a list of paths that should be checked to detect change |
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129 |
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130 The list will include: |
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131 - extensions (will not cover all files for complex extensions) |
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132 - mercurial/__version__.py |
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133 - python binary |
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134 """ |
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135 modules = [m for n, m in extensions.extensions(ui)] |
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136 try: |
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137 from . import __version__ |
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138 modules.append(__version__) |
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139 except ImportError: |
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140 pass |
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141 files = [pycompat.sysexecutable] |
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142 for m in modules: |
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143 try: |
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144 files.append(inspect.getabsfile(m)) |
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145 except TypeError: |
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146 pass |
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147 return sorted(set(files)) |
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148 |
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149 def _mtimehash(paths): |
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150 """return a quick hash for detecting file changes |
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151 |
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152 mtimehash calls stat on given paths and calculate a hash based on size and |
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153 mtime of each file. mtimehash does not read file content because reading is |
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154 expensive. therefore it's not 100% reliable for detecting content changes. |
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155 it's possible to return different hashes for same file contents. |
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156 it's also possible to return a same hash for different file contents for |
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157 some carefully crafted situation. |
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158 |
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159 for chgserver, it is designed that once mtimehash changes, the server is |
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160 considered outdated immediately and should no longer provide service. |
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161 |
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162 mtimehash is not included in confighash because we only know the paths of |
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163 extensions after importing them (there is imp.find_module but that faces |
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164 race conditions). We need to calculate confighash without importing. |
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165 """ |
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166 def trystat(path): |
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167 try: |
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168 st = os.stat(path) |
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169 return (st[stat.ST_MTIME], st.st_size) |
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170 except OSError: |
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171 # could be ENOENT, EPERM etc. not fatal in any case |
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172 pass |
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173 return _hashlist(map(trystat, paths))[:12] |
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174 |
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175 class hashstate(object): |
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176 """a structure storing confighash, mtimehash, paths used for mtimehash""" |
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177 def __init__(self, confighash, mtimehash, mtimepaths): |
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178 self.confighash = confighash |
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179 self.mtimehash = mtimehash |
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180 self.mtimepaths = mtimepaths |
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181 |
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182 @staticmethod |
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183 def fromui(ui, mtimepaths=None): |
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184 if mtimepaths is None: |
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185 mtimepaths = _getmtimepaths(ui) |
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186 confighash = _confighash(ui) |
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187 mtimehash = _mtimehash(mtimepaths) |
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188 _log('confighash = %s mtimehash = %s\n' % (confighash, mtimehash)) |
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189 return hashstate(confighash, mtimehash, mtimepaths) |
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190 |
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191 def _newchgui(srcui, csystem, attachio): |
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192 class chgui(srcui.__class__): |
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193 def __init__(self, src=None): |
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194 super(chgui, self).__init__(src) |
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195 if src: |
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196 self._csystem = getattr(src, '_csystem', csystem) |
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197 else: |
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198 self._csystem = csystem |
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199 |
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200 def _runsystem(self, cmd, environ, cwd, out): |
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201 # fallback to the original system method if |
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202 # a. the output stream is not stdout (e.g. stderr, cStringIO), |
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203 # b. or stdout is redirected by protectstdio(), |
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204 # because the chg client is not aware of these situations and |
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205 # will behave differently (i.e. write to stdout). |
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206 if (out is not self.fout |
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207 or not util.safehasattr(self.fout, 'fileno') |
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208 or self.fout.fileno() != procutil.stdout.fileno() |
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209 or self._finoutredirected): |
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210 return procutil.system(cmd, environ=environ, cwd=cwd, out=out) |
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211 self.flush() |
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212 return self._csystem(cmd, procutil.shellenviron(environ), cwd) |
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213 |
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214 def _runpager(self, cmd, env=None): |
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215 self._csystem(cmd, procutil.shellenviron(env), type='pager', |
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216 cmdtable={'attachio': attachio}) |
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217 return True |
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218 |
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219 return chgui(srcui) |
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220 |
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221 def _loadnewui(srcui, args): |
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222 from . import dispatch # avoid cycle |
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223 |
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224 newui = srcui.__class__.load() |
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225 for a in ['fin', 'fout', 'ferr', 'environ']: |
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226 setattr(newui, a, getattr(srcui, a)) |
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227 if util.safehasattr(srcui, '_csystem'): |
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228 newui._csystem = srcui._csystem |
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229 |
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230 # command line args |
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231 options = dispatch._earlyparseopts(newui, args) |
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232 dispatch._parseconfig(newui, options['config']) |
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233 |
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234 # stolen from tortoisehg.util.copydynamicconfig() |
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235 for section, name, value in srcui.walkconfig(): |
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236 source = srcui.configsource(section, name) |
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237 if ':' in source or source == '--config' or source.startswith('$'): |
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238 # path:line or command line, or environ |
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239 continue |
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240 newui.setconfig(section, name, value, source) |
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241 |
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242 # load wd and repo config, copied from dispatch.py |
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243 cwd = options['cwd'] |
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244 cwd = cwd and os.path.realpath(cwd) or None |
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245 rpath = options['repository'] |
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246 path, newlui = dispatch._getlocal(newui, rpath, wd=cwd) |
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247 |
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248 return (newui, newlui) |
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249 |
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250 class channeledsystem(object): |
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251 """Propagate ui.system() request in the following format: |
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252 |
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253 payload length (unsigned int), |
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254 type, '\0', |
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255 cmd, '\0', |
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256 cwd, '\0', |
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257 envkey, '=', val, '\0', |
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258 ... |
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259 envkey, '=', val |
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260 |
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261 if type == 'system', waits for: |
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262 |
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263 exitcode length (unsigned int), |
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264 exitcode (int) |
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265 |
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266 if type == 'pager', repetitively waits for a command name ending with '\n' |
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267 and executes it defined by cmdtable, or exits the loop if the command name |
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268 is empty. |
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269 """ |
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270 def __init__(self, in_, out, channel): |
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271 self.in_ = in_ |
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272 self.out = out |
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273 self.channel = channel |
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274 |
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275 def __call__(self, cmd, environ, cwd=None, type='system', cmdtable=None): |
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276 args = [type, procutil.quotecommand(cmd), os.path.abspath(cwd or '.')] |
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277 args.extend('%s=%s' % (k, v) for k, v in environ.iteritems()) |
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278 data = '\0'.join(args) |
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279 self.out.write(struct.pack('>cI', self.channel, len(data))) |
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280 self.out.write(data) |
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281 self.out.flush() |
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282 |
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283 if type == 'system': |
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284 length = self.in_.read(4) |
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285 length, = struct.unpack('>I', length) |
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286 if length != 4: |
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287 raise error.Abort(_('invalid response')) |
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288 rc, = struct.unpack('>i', self.in_.read(4)) |
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289 return rc |
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290 elif type == 'pager': |
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291 while True: |
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292 cmd = self.in_.readline()[:-1] |
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293 if not cmd: |
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294 break |
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295 if cmdtable and cmd in cmdtable: |
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296 _log('pager subcommand: %s' % cmd) |
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297 cmdtable[cmd]() |
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298 else: |
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299 raise error.Abort(_('unexpected command: %s') % cmd) |
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300 else: |
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301 raise error.ProgrammingError('invalid S channel type: %s' % type) |
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302 |
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303 _iochannels = [ |
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304 # server.ch, ui.fp, mode |
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305 ('cin', 'fin', r'rb'), |
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306 ('cout', 'fout', r'wb'), |
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307 ('cerr', 'ferr', r'wb'), |
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308 ] |
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309 |
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310 class chgcmdserver(commandserver.server): |
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311 def __init__(self, ui, repo, fin, fout, sock, hashstate, baseaddress): |
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312 super(chgcmdserver, self).__init__( |
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313 _newchgui(ui, channeledsystem(fin, fout, 'S'), self.attachio), |
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314 repo, fin, fout) |
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315 self.clientsock = sock |
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316 self._oldios = [] # original (self.ch, ui.fp, fd) before "attachio" |
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317 self.hashstate = hashstate |
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318 self.baseaddress = baseaddress |
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319 if hashstate is not None: |
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320 self.capabilities = self.capabilities.copy() |
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321 self.capabilities['validate'] = chgcmdserver.validate |
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322 |
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323 def cleanup(self): |
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324 super(chgcmdserver, self).cleanup() |
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325 # dispatch._runcatch() does not flush outputs if exception is not |
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326 # handled by dispatch._dispatch() |
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327 self.ui.flush() |
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328 self._restoreio() |
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329 |
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330 def attachio(self): |
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331 """Attach to client's stdio passed via unix domain socket; all |
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332 channels except cresult will no longer be used |
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333 """ |
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334 # tell client to sendmsg() with 1-byte payload, which makes it |
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335 # distinctive from "attachio\n" command consumed by client.read() |
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336 self.clientsock.sendall(struct.pack('>cI', 'I', 1)) |
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337 clientfds = util.recvfds(self.clientsock.fileno()) |
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338 _log('received fds: %r\n' % clientfds) |
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339 |
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340 ui = self.ui |
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341 ui.flush() |
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342 first = self._saveio() |
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343 for fd, (cn, fn, mode) in zip(clientfds, _iochannels): |
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344 assert fd > 0 |
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345 fp = getattr(ui, fn) |
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346 os.dup2(fd, fp.fileno()) |
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347 os.close(fd) |
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348 if not first: |
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349 continue |
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350 # reset buffering mode when client is first attached. as we want |
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351 # to see output immediately on pager, the mode stays unchanged |
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352 # when client re-attached. ferr is unchanged because it should |
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353 # be unbuffered no matter if it is a tty or not. |
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354 if fn == 'ferr': |
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355 newfp = fp |
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356 else: |
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357 # make it line buffered explicitly because the default is |
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358 # decided on first write(), where fout could be a pager. |
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359 if fp.isatty(): |
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360 bufsize = 1 # line buffered |
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361 else: |
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362 bufsize = -1 # system default |
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363 newfp = os.fdopen(fp.fileno(), mode, bufsize) |
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364 setattr(ui, fn, newfp) |
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365 setattr(self, cn, newfp) |
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366 |
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367 self.cresult.write(struct.pack('>i', len(clientfds))) |
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368 |
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369 def _saveio(self): |
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370 if self._oldios: |
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371 return False |
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372 ui = self.ui |
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373 for cn, fn, _mode in _iochannels: |
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374 ch = getattr(self, cn) |
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375 fp = getattr(ui, fn) |
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376 fd = os.dup(fp.fileno()) |
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377 self._oldios.append((ch, fp, fd)) |
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378 return True |
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379 |
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380 def _restoreio(self): |
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381 ui = self.ui |
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382 for (ch, fp, fd), (cn, fn, _mode) in zip(self._oldios, _iochannels): |
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383 newfp = getattr(ui, fn) |
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384 # close newfp while it's associated with client; otherwise it |
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385 # would be closed when newfp is deleted |
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386 if newfp is not fp: |
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387 newfp.close() |
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388 # restore original fd: fp is open again |
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389 os.dup2(fd, fp.fileno()) |
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390 os.close(fd) |
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391 setattr(self, cn, ch) |
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392 setattr(ui, fn, fp) |
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393 del self._oldios[:] |
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394 |
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395 def validate(self): |
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396 """Reload the config and check if the server is up to date |
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397 |
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398 Read a list of '\0' separated arguments. |
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399 Write a non-empty list of '\0' separated instruction strings or '\0' |
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400 if the list is empty. |
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401 An instruction string could be either: |
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402 - "unlink $path", the client should unlink the path to stop the |
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403 outdated server. |
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404 - "redirect $path", the client should attempt to connect to $path |
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405 first. If it does not work, start a new server. It implies |
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406 "reconnect". |
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407 - "exit $n", the client should exit directly with code n. |
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408 This may happen if we cannot parse the config. |
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409 - "reconnect", the client should close the connection and |
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410 reconnect. |
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411 If neither "reconnect" nor "redirect" is included in the instruction |
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412 list, the client can continue with this server after completing all |
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413 the instructions. |
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414 """ |
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415 from . import dispatch # avoid cycle |
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416 |
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417 args = self._readlist() |
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418 try: |
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419 self.ui, lui = _loadnewui(self.ui, args) |
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420 except error.ParseError as inst: |
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421 dispatch._formatparse(self.ui.warn, inst) |
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422 self.ui.flush() |
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423 self.cresult.write('exit 255') |
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424 return |
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425 newhash = hashstate.fromui(lui, self.hashstate.mtimepaths) |
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426 insts = [] |
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427 if newhash.mtimehash != self.hashstate.mtimehash: |
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428 addr = _hashaddress(self.baseaddress, self.hashstate.confighash) |
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429 insts.append('unlink %s' % addr) |
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430 # mtimehash is empty if one or more extensions fail to load. |
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431 # to be compatible with hg, still serve the client this time. |
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432 if self.hashstate.mtimehash: |
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433 insts.append('reconnect') |
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434 if newhash.confighash != self.hashstate.confighash: |
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435 addr = _hashaddress(self.baseaddress, newhash.confighash) |
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436 insts.append('redirect %s' % addr) |
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437 _log('validate: %s\n' % insts) |
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438 self.cresult.write('\0'.join(insts) or '\0') |
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439 |
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440 def chdir(self): |
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441 """Change current directory |
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442 |
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443 Note that the behavior of --cwd option is bit different from this. |
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444 It does not affect --config parameter. |
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445 """ |
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446 path = self._readstr() |
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447 if not path: |
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448 return |
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449 _log('chdir to %r\n' % path) |
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450 os.chdir(path) |
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451 |
28159 | 452 def setumask(self): |
453 """Change umask""" | |
454 mask = struct.unpack('>I', self._read(4))[0] | |
455 _log('setumask %r\n' % mask) | |
456 os.umask(mask) | |
457 | |
30644 | 458 def runcommand(self): |
459 return super(chgcmdserver, self).runcommand() | |
460 | |
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461 def setenv(self): |
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462 """Clear and update os.environ |
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463 |
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464 Note that not all variables can make an effect on the running process. |
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465 """ |
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466 l = self._readlist() |
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467 try: |
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468 newenv = dict(s.split('=', 1) for s in l) |
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469 except ValueError: |
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470 raise ValueError('unexpected value in setenv request') |
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471 _log('setenv: %r\n' % sorted(newenv.keys())) |
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472 encoding.environ.clear() |
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473 encoding.environ.update(newenv) |
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474 |
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475 capabilities = commandserver.server.capabilities.copy() |
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476 capabilities.update({'attachio': attachio, |
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477 'chdir': chdir, |
30644 | 478 'runcommand': runcommand, |
28159 | 479 'setenv': setenv, |
480 'setumask': setumask}) | |
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481 |
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482 if util.safehasattr(procutil, 'setprocname'): |
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483 def setprocname(self): |
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484 """Change process title""" |
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485 name = self._readstr() |
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486 _log('setprocname: %r\n' % name) |
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487 procutil.setprocname(name) |
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488 capabilities['setprocname'] = setprocname |
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489 |
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490 def _tempaddress(address): |
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491 return '%s.%d.tmp' % (address, os.getpid()) |
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492 |
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493 def _hashaddress(address, hashstr): |
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494 # if the basename of address contains '.', use only the left part. this |
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495 # makes it possible for the client to pass 'server.tmp$PID' and follow by |
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496 # an atomic rename to avoid locking when spawning new servers. |
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497 dirname, basename = os.path.split(address) |
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498 basename = basename.split('.', 1)[0] |
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499 return '%s-%s' % (os.path.join(dirname, basename), hashstr) |
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500 |
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501 class chgunixservicehandler(object): |
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502 """Set of operations for chg services""" |
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503 |
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504 pollinterval = 1 # [sec] |
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505 |
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506 def __init__(self, ui): |
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507 self.ui = ui |
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508 self._idletimeout = ui.configint('chgserver', 'idletimeout') |
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509 self._lastactive = time.time() |
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510 |
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511 def bindsocket(self, sock, address): |
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512 self._inithashstate(address) |
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513 self._checkextensions() |
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514 self._bind(sock) |
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515 self._createsymlink() |
32237
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516 # no "listening at" message should be printed to simulate hg behavior |
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517 |
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518 def _inithashstate(self, address): |
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519 self._baseaddress = address |
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520 if self.ui.configbool('chgserver', 'skiphash'): |
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521 self._hashstate = None |
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522 self._realaddress = address |
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523 return |
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524 self._hashstate = hashstate.fromui(self.ui) |
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525 self._realaddress = _hashaddress(address, self._hashstate.confighash) |
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526 |
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527 def _checkextensions(self): |
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528 if not self._hashstate: |
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529 return |
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530 if extensions.notloaded(): |
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531 # one or more extensions failed to load. mtimehash becomes |
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532 # meaningless because we do not know the paths of those extensions. |
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533 # set mtimehash to an illegal hash value to invalidate the server. |
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534 self._hashstate.mtimehash = '' |
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535 |
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536 def _bind(self, sock): |
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537 # use a unique temp address so we can stat the file and do ownership |
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538 # check later |
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539 tempaddress = _tempaddress(self._realaddress) |
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540 util.bindunixsocket(sock, tempaddress) |
29529
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541 self._socketstat = os.stat(tempaddress) |
32236
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542 sock.listen(socket.SOMAXCONN) |
29529
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543 # rename will replace the old socket file if exists atomically. the |
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544 # old server will detect ownership change and exit. |
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545 util.rename(tempaddress, self._realaddress) |
28223
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546 |
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547 def _createsymlink(self): |
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548 if self._baseaddress == self._realaddress: |
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549 return |
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550 tempaddress = _tempaddress(self._baseaddress) |
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551 os.symlink(os.path.basename(self._realaddress), tempaddress) |
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552 util.rename(tempaddress, self._baseaddress) |
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|
553 |
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554 def _issocketowner(self): |
28223
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|
555 try: |
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|
556 st = os.stat(self._realaddress) |
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557 return (st.st_ino == self._socketstat.st_ino and |
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|
558 st[stat.ST_MTIME] == self._socketstat[stat.ST_MTIME]) |
28223
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|
559 except OSError: |
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|
560 return False |
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|
561 |
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|
562 def unlinksocket(self, address): |
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563 if not self._issocketowner(): |
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564 return |
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565 # it is possible to have a race condition here that we may |
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566 # remove another server's socket file. but that's okay |
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567 # since that server will detect and exit automatically and |
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568 # the client will start a new server on demand. |
31545 | 569 util.tryunlink(self._realaddress) |
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570 |
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571 def shouldexit(self): |
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572 if not self._issocketowner(): |
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573 self.ui.debug('%s is not owned, exiting.\n' % self._realaddress) |
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574 return True |
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575 if time.time() - self._lastactive > self._idletimeout: |
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576 self.ui.debug('being idle too long. exiting.\n') |
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577 return True |
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578 return False |
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|
579 |
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580 def newconnection(self): |
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581 self._lastactive = time.time() |
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|
582 |
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583 def createcmdserver(self, repo, conn, fin, fout): |
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584 return chgcmdserver(self.ui, repo, fin, fout, conn, |
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585 self._hashstate, self._baseaddress) |
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|
586 |
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|
587 def chgunixservice(ui, repo, opts): |
33860
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588 # CHGINTERNALMARK is set by chg client. It is an indication of things are |
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589 # started by chg so other code can do things accordingly, like disabling |
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|
590 # demandimport or detecting chg client started by chg client. When executed |
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591 # here, CHGINTERNALMARK is no longer useful and hence dropped to make |
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|
592 # environ cleaner. |
30635
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|
593 if 'CHGINTERNALMARK' in encoding.environ: |
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|
594 del encoding.environ['CHGINTERNALMARK'] |
30511
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|
595 |
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changeset
|
596 if repo: |
30332
318a24b52eeb
spelling: fixes of non-dictionary words
Mads Kiilerich <madski@unity3d.com>
parents:
29841
diff
changeset
|
597 # one chgserver can serve multiple repos. drop repo information |
29546
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|
598 ui.setconfig('bundle', 'mainreporoot', '', 'repo') |
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|
599 h = chgunixservicehandler(ui) |
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changeset
|
600 return commandserver.unixforkingservice(ui, repo=None, opts=opts, handler=h) |