Mercurial > hg
annotate mercurial/chgserver.py @ 32076:d7b698ae153b stable
help: explain how to access subtopics in internals
author | Matt DeVore <matvore@google.com> |
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date | Wed, 19 Apr 2017 17:04:22 -0700 |
parents | e518192d6bac |
children | d74b0cff94a9 |
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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 struct |
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48 import time |
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49 |
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50 from .i18n import _ |
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51 |
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52 from . import ( |
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53 commandserver, |
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54 encoding, |
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55 error, |
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56 extensions, |
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57 osutil, |
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58 pycompat, |
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59 util, |
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60 ) |
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61 |
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62 _log = commandserver.log |
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63 |
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64 def _hashlist(items): |
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65 """return sha1 hexdigest for a list""" |
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66 return hashlib.sha1(str(items)).hexdigest() |
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67 |
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68 # sensitive config sections affecting confighash |
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69 _configsections = [ |
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70 'alias', # affects global state commands.table |
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71 'extdiff', # uisetup will register new commands |
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72 'extensions', |
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73 ] |
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74 |
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75 # sensitive environment variables affecting confighash |
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76 _envre = re.compile(r'''\A(?: |
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77 CHGHG |
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79 |LANG(?:UAGE)? |
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80 |LC_.* |
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81 |LD_.* |
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82 |PATH |
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83 |PYTHON.* |
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84 |TERM(?:INFO)? |
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85 |TZ |
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86 )\Z''', re.X) |
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87 |
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88 def _confighash(ui): |
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89 """return a quick hash for detecting config/env changes |
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90 |
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91 confighash is the hash of sensitive config items and environment variables. |
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92 |
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93 for chgserver, it is designed that once confighash changes, the server is |
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94 not qualified to serve its client and should redirect the client to a new |
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95 server. different from mtimehash, confighash change will not mark the |
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96 server outdated and exit since the user can have different configs at the |
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97 same time. |
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98 """ |
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99 sectionitems = [] |
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100 for section in _configsections: |
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101 sectionitems.append(ui.configitems(section)) |
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102 sectionhash = _hashlist(sectionitems) |
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103 envitems = [(k, v) for k, v in encoding.environ.iteritems() |
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104 if _envre.match(k)] |
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105 envhash = _hashlist(sorted(envitems)) |
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106 return sectionhash[:6] + envhash[:6] |
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107 |
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108 def _getmtimepaths(ui): |
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109 """get a list of paths that should be checked to detect change |
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110 |
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111 The list will include: |
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112 - extensions (will not cover all files for complex extensions) |
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113 - mercurial/__version__.py |
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114 - python binary |
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115 """ |
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116 modules = [m for n, m in extensions.extensions(ui)] |
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117 try: |
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118 from . import __version__ |
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119 modules.append(__version__) |
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120 except ImportError: |
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121 pass |
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122 files = [pycompat.sysexecutable] |
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123 for m in modules: |
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124 try: |
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125 files.append(inspect.getabsfile(m)) |
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126 except TypeError: |
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127 pass |
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128 return sorted(set(files)) |
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129 |
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130 def _mtimehash(paths): |
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131 """return a quick hash for detecting file changes |
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132 |
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133 mtimehash calls stat on given paths and calculate a hash based on size and |
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134 mtime of each file. mtimehash does not read file content because reading is |
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135 expensive. therefore it's not 100% reliable for detecting content changes. |
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136 it's possible to return different hashes for same file contents. |
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137 it's also possible to return a same hash for different file contents for |
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138 some carefully crafted situation. |
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139 |
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140 for chgserver, it is designed that once mtimehash changes, the server is |
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141 considered outdated immediately and should no longer provide service. |
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142 |
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143 mtimehash is not included in confighash because we only know the paths of |
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144 extensions after importing them (there is imp.find_module but that faces |
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145 race conditions). We need to calculate confighash without importing. |
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146 """ |
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147 def trystat(path): |
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148 try: |
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149 st = os.stat(path) |
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150 return (st.st_mtime, st.st_size) |
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151 except OSError: |
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152 # could be ENOENT, EPERM etc. not fatal in any case |
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153 pass |
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154 return _hashlist(map(trystat, paths))[:12] |
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155 |
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156 class hashstate(object): |
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157 """a structure storing confighash, mtimehash, paths used for mtimehash""" |
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158 def __init__(self, confighash, mtimehash, mtimepaths): |
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159 self.confighash = confighash |
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160 self.mtimehash = mtimehash |
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161 self.mtimepaths = mtimepaths |
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162 |
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163 @staticmethod |
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164 def fromui(ui, mtimepaths=None): |
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165 if mtimepaths is None: |
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166 mtimepaths = _getmtimepaths(ui) |
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167 confighash = _confighash(ui) |
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168 mtimehash = _mtimehash(mtimepaths) |
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169 _log('confighash = %s mtimehash = %s\n' % (confighash, mtimehash)) |
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170 return hashstate(confighash, mtimehash, mtimepaths) |
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171 |
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172 def _newchgui(srcui, csystem, attachio): |
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173 class chgui(srcui.__class__): |
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174 def __init__(self, src=None): |
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175 super(chgui, self).__init__(src) |
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176 if src: |
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177 self._csystem = getattr(src, '_csystem', csystem) |
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178 else: |
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179 self._csystem = csystem |
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180 |
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181 def _runsystem(self, cmd, environ, cwd, out): |
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182 # fallback to the original system method if the output needs to be |
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183 # captured (to self._buffers), or the output stream is not stdout |
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184 # (e.g. stderr, cStringIO), because the chg client is not aware of |
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185 # these situations and will behave differently (write to stdout). |
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186 if (out is not self.fout |
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187 or not util.safehasattr(self.fout, 'fileno') |
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188 or self.fout.fileno() != util.stdout.fileno()): |
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189 return util.system(cmd, environ=environ, cwd=cwd, out=out) |
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190 self.flush() |
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191 return self._csystem(cmd, util.shellenviron(environ), cwd) |
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192 |
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193 def _runpager(self, cmd, env=None): |
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194 self._csystem(cmd, util.shellenviron(env), type='pager', |
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195 cmdtable={'attachio': attachio}) |
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196 return True |
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197 |
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198 return chgui(srcui) |
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199 |
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200 def _loadnewui(srcui, args): |
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201 from . import dispatch # avoid cycle |
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202 |
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203 newui = srcui.__class__.load() |
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204 for a in ['fin', 'fout', 'ferr', 'environ']: |
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205 setattr(newui, a, getattr(srcui, a)) |
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206 if util.safehasattr(srcui, '_csystem'): |
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207 newui._csystem = srcui._csystem |
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208 |
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209 # command line args |
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210 args = args[:] |
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211 dispatch._parseconfig(newui, dispatch._earlygetopt(['--config'], args)) |
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212 |
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213 # stolen from tortoisehg.util.copydynamicconfig() |
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214 for section, name, value in srcui.walkconfig(): |
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215 source = srcui.configsource(section, name) |
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216 if ':' in source or source == '--config' or source.startswith('$'): |
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217 # path:line or command line, or environ |
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218 continue |
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219 newui.setconfig(section, name, value, source) |
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220 |
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221 # load wd and repo config, copied from dispatch.py |
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222 cwds = dispatch._earlygetopt(['--cwd'], args) |
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223 cwd = cwds and os.path.realpath(cwds[-1]) or None |
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224 rpath = dispatch._earlygetopt(["-R", "--repository", "--repo"], args) |
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225 path, newlui = dispatch._getlocal(newui, rpath, wd=cwd) |
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226 |
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227 return (newui, newlui) |
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228 |
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229 class channeledsystem(object): |
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230 """Propagate ui.system() request in the following format: |
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231 |
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232 payload length (unsigned int), |
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233 type, '\0', |
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234 cmd, '\0', |
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235 cwd, '\0', |
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236 envkey, '=', val, '\0', |
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237 ... |
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238 envkey, '=', val |
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239 |
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240 if type == 'system', waits for: |
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241 |
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242 exitcode length (unsigned int), |
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243 exitcode (int) |
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244 |
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245 if type == 'pager', repetitively waits for a command name ending with '\n' |
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246 and executes it defined by cmdtable, or exits the loop if the command name |
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247 is empty. |
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248 """ |
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249 def __init__(self, in_, out, channel): |
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250 self.in_ = in_ |
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251 self.out = out |
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252 self.channel = channel |
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253 |
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254 def __call__(self, cmd, environ, cwd=None, type='system', cmdtable=None): |
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255 args = [type, util.quotecommand(cmd), os.path.abspath(cwd or '.')] |
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256 args.extend('%s=%s' % (k, v) for k, v in environ.iteritems()) |
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257 data = '\0'.join(args) |
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258 self.out.write(struct.pack('>cI', self.channel, len(data))) |
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259 self.out.write(data) |
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260 self.out.flush() |
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261 |
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262 if type == 'system': |
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263 length = self.in_.read(4) |
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264 length, = struct.unpack('>I', length) |
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265 if length != 4: |
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266 raise error.Abort(_('invalid response')) |
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267 rc, = struct.unpack('>i', self.in_.read(4)) |
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268 return rc |
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269 elif type == 'pager': |
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270 while True: |
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271 cmd = self.in_.readline()[:-1] |
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272 if not cmd: |
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273 break |
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274 if cmdtable and cmd in cmdtable: |
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275 _log('pager subcommand: %s' % cmd) |
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276 cmdtable[cmd]() |
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277 else: |
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278 raise error.Abort(_('unexpected command: %s') % cmd) |
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279 else: |
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280 raise error.ProgrammingError('invalid S channel type: %s' % type) |
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281 |
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282 _iochannels = [ |
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283 # server.ch, ui.fp, mode |
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284 ('cin', 'fin', pycompat.sysstr('rb')), |
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285 ('cout', 'fout', pycompat.sysstr('wb')), |
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286 ('cerr', 'ferr', pycompat.sysstr('wb')), |
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287 ] |
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288 |
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289 class chgcmdserver(commandserver.server): |
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290 def __init__(self, ui, repo, fin, fout, sock, hashstate, baseaddress): |
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291 super(chgcmdserver, self).__init__( |
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292 _newchgui(ui, channeledsystem(fin, fout, 'S'), self.attachio), |
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293 repo, fin, fout) |
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294 self.clientsock = sock |
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295 self._oldios = [] # original (self.ch, ui.fp, fd) before "attachio" |
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296 self.hashstate = hashstate |
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297 self.baseaddress = baseaddress |
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298 if hashstate is not None: |
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299 self.capabilities = self.capabilities.copy() |
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300 self.capabilities['validate'] = chgcmdserver.validate |
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301 |
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302 def cleanup(self): |
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303 super(chgcmdserver, self).cleanup() |
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304 # dispatch._runcatch() does not flush outputs if exception is not |
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305 # handled by dispatch._dispatch() |
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306 self.ui.flush() |
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307 self._restoreio() |
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308 |
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309 def attachio(self): |
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310 """Attach to client's stdio passed via unix domain socket; all |
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311 channels except cresult will no longer be used |
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312 """ |
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313 # tell client to sendmsg() with 1-byte payload, which makes it |
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314 # distinctive from "attachio\n" command consumed by client.read() |
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315 self.clientsock.sendall(struct.pack('>cI', 'I', 1)) |
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316 clientfds = osutil.recvfds(self.clientsock.fileno()) |
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317 _log('received fds: %r\n' % clientfds) |
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318 |
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319 ui = self.ui |
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320 ui.flush() |
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321 first = self._saveio() |
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322 for fd, (cn, fn, mode) in zip(clientfds, _iochannels): |
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323 assert fd > 0 |
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324 fp = getattr(ui, fn) |
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325 os.dup2(fd, fp.fileno()) |
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326 os.close(fd) |
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327 if not first: |
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328 continue |
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329 # reset buffering mode when client is first attached. as we want |
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330 # to see output immediately on pager, the mode stays unchanged |
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331 # when client re-attached. ferr is unchanged because it should |
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332 # be unbuffered no matter if it is a tty or not. |
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333 if fn == 'ferr': |
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334 newfp = fp |
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335 else: |
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336 # make it line buffered explicitly because the default is |
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337 # decided on first write(), where fout could be a pager. |
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338 if fp.isatty(): |
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339 bufsize = 1 # line buffered |
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340 else: |
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341 bufsize = -1 # system default |
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342 newfp = os.fdopen(fp.fileno(), mode, bufsize) |
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343 setattr(ui, fn, newfp) |
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344 setattr(self, cn, newfp) |
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345 |
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346 self.cresult.write(struct.pack('>i', len(clientfds))) |
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347 |
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348 def _saveio(self): |
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349 if self._oldios: |
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350 return False |
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351 ui = self.ui |
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352 for cn, fn, _mode in _iochannels: |
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353 ch = getattr(self, cn) |
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354 fp = getattr(ui, fn) |
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355 fd = os.dup(fp.fileno()) |
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356 self._oldios.append((ch, fp, fd)) |
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357 return True |
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358 |
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359 def _restoreio(self): |
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360 ui = self.ui |
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361 for (ch, fp, fd), (cn, fn, _mode) in zip(self._oldios, _iochannels): |
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362 newfp = getattr(ui, fn) |
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363 # close newfp while it's associated with client; otherwise it |
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364 # would be closed when newfp is deleted |
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365 if newfp is not fp: |
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366 newfp.close() |
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367 # restore original fd: fp is open again |
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368 os.dup2(fd, fp.fileno()) |
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369 os.close(fd) |
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370 setattr(self, cn, ch) |
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371 setattr(ui, fn, fp) |
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372 del self._oldios[:] |
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373 |
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374 def validate(self): |
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375 """Reload the config and check if the server is up to date |
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376 |
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377 Read a list of '\0' separated arguments. |
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378 Write a non-empty list of '\0' separated instruction strings or '\0' |
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379 if the list is empty. |
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380 An instruction string could be either: |
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381 - "unlink $path", the client should unlink the path to stop the |
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|
382 outdated server. |
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|
383 - "redirect $path", the client should attempt to connect to $path |
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384 first. If it does not work, start a new server. It implies |
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385 "reconnect". |
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386 - "exit $n", the client should exit directly with code n. |
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387 This may happen if we cannot parse the config. |
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388 - "reconnect", the client should close the connection and |
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389 reconnect. |
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390 If neither "reconnect" nor "redirect" is included in the instruction |
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391 list, the client can continue with this server after completing all |
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392 the instructions. |
28350
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393 """ |
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394 from . import dispatch # avoid cycle |
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395 |
28350
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396 args = self._readlist() |
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397 try: |
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398 self.ui, lui = _loadnewui(self.ui, args) |
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399 except error.ParseError as inst: |
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400 dispatch._formatparse(self.ui.warn, inst) |
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401 self.ui.flush() |
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402 self.cresult.write('exit 255') |
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403 return |
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404 newhash = hashstate.fromui(lui, self.hashstate.mtimepaths) |
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405 insts = [] |
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406 if newhash.mtimehash != self.hashstate.mtimehash: |
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407 addr = _hashaddress(self.baseaddress, self.hashstate.confighash) |
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408 insts.append('unlink %s' % addr) |
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409 # mtimehash is empty if one or more extensions fail to load. |
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410 # to be compatible with hg, still serve the client this time. |
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411 if self.hashstate.mtimehash: |
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412 insts.append('reconnect') |
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413 if newhash.confighash != self.hashstate.confighash: |
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414 addr = _hashaddress(self.baseaddress, newhash.confighash) |
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415 insts.append('redirect %s' % addr) |
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416 _log('validate: %s\n' % insts) |
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417 self.cresult.write('\0'.join(insts) or '\0') |
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418 |
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419 def chdir(self): |
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420 """Change current directory |
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421 |
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422 Note that the behavior of --cwd option is bit different from this. |
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423 It does not affect --config parameter. |
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424 """ |
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425 path = self._readstr() |
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426 if not path: |
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427 return |
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428 _log('chdir to %r\n' % path) |
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429 os.chdir(path) |
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430 |
28159 | 431 def setumask(self): |
432 """Change umask""" | |
433 mask = struct.unpack('>I', self._read(4))[0] | |
434 _log('setumask %r\n' % mask) | |
435 os.umask(mask) | |
436 | |
30644 | 437 def runcommand(self): |
438 return super(chgcmdserver, self).runcommand() | |
439 | |
27792
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440 def setenv(self): |
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441 """Clear and update os.environ |
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442 |
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443 Note that not all variables can make an effect on the running process. |
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|
444 """ |
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445 l = self._readlist() |
27792
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446 try: |
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447 newenv = dict(s.split('=', 1) for s in l) |
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448 except ValueError: |
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449 raise ValueError('unexpected value in setenv request') |
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450 _log('setenv: %r\n' % sorted(newenv.keys())) |
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451 encoding.environ.clear() |
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|
452 encoding.environ.update(newenv) |
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453 |
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454 capabilities = commandserver.server.capabilities.copy() |
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455 capabilities.update({'attachio': attachio, |
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456 'chdir': chdir, |
30644 | 457 'runcommand': runcommand, |
28159 | 458 'setenv': setenv, |
459 'setumask': setumask}) | |
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|
460 |
30750
378686afca52
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|
461 if util.safehasattr(osutil, 'setprocname'): |
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462 def setprocname(self): |
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463 """Change process title""" |
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464 name = self._readstr() |
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465 _log('setprocname: %r\n' % name) |
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|
466 osutil.setprocname(name) |
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|
467 capabilities['setprocname'] = setprocname |
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|
468 |
28223
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469 def _tempaddress(address): |
0a853dc9b306
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470 return '%s.%d.tmp' % (address, os.getpid()) |
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|
471 |
28326
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chgserver: mangle server address to include confighash
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472 def _hashaddress(address, hashstr): |
30619
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473 # if the basename of address contains '.', use only the left part. this |
88efb4fb1975
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474 # makes it possible for the client to pass 'server.tmp$PID' and follow by |
88efb4fb1975
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475 # an atomic rename to avoid locking when spawning new servers. |
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476 dirname, basename = os.path.split(address) |
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477 basename = basename.split('.', 1)[0] |
88efb4fb1975
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478 return '%s-%s' % (os.path.join(dirname, basename), hashstr) |
28326
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479 |
29547
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|
480 class chgunixservicehandler(object): |
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481 """Set of operations for chg services""" |
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482 |
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483 pollinterval = 1 # [sec] |
300318b7d66d
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|
484 |
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485 def __init__(self, ui): |
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486 self.ui = ui |
29598
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487 self._idletimeout = ui.configint('chgserver', 'idletimeout', 3600) |
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488 self._lastactive = time.time() |
29547
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489 |
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|
490 def bindsocket(self, sock, address): |
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491 self._inithashstate(address) |
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492 self._checkextensions() |
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493 self._bind(sock) |
29545
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494 self._createsymlink() |
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|
495 |
29597
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29596
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|
496 def _inithashstate(self, address): |
29598
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497 self._baseaddress = address |
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|
498 if self.ui.configbool('chgserver', 'skiphash', False): |
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|
499 self._hashstate = None |
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500 self._realaddress = address |
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|
501 return |
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502 self._hashstate = hashstate.fromui(self.ui) |
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503 self._realaddress = _hashaddress(address, self._hashstate.confighash) |
29545
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|
504 |
28aca3fafc2a
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|
505 def _checkextensions(self): |
29598
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|
506 if not self._hashstate: |
29545
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|
507 return |
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|
508 if extensions.notloaded(): |
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509 # one or more extensions failed to load. mtimehash becomes |
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510 # meaningless because we do not know the paths of those extensions. |
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511 # set mtimehash to an illegal hash value to invalidate the server. |
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512 self._hashstate.mtimehash = '' |
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513 |
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514 def _bind(self, sock): |
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515 # use a unique temp address so we can stat the file and do ownership |
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516 # check later |
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517 tempaddress = _tempaddress(self._realaddress) |
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518 util.bindunixsocket(sock, tempaddress) |
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519 self._socketstat = os.stat(tempaddress) |
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520 # rename will replace the old socket file if exists atomically. the |
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521 # old server will detect ownership change and exit. |
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522 util.rename(tempaddress, self._realaddress) |
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523 |
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524 def _createsymlink(self): |
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525 if self._baseaddress == self._realaddress: |
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526 return |
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527 tempaddress = _tempaddress(self._baseaddress) |
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528 os.symlink(os.path.basename(self._realaddress), tempaddress) |
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529 util.rename(tempaddress, self._baseaddress) |
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530 |
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531 def _issocketowner(self): |
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532 try: |
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533 stat = os.stat(self._realaddress) |
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534 return (stat.st_ino == self._socketstat.st_ino and |
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535 stat.st_mtime == self._socketstat.st_mtime) |
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536 except OSError: |
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537 return False |
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538 |
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539 def unlinksocket(self, address): |
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540 if not self._issocketowner(): |
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541 return |
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542 # it is possible to have a race condition here that we may |
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543 # remove another server's socket file. but that's okay |
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544 # since that server will detect and exit automatically and |
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545 # the client will start a new server on demand. |
31545 | 546 util.tryunlink(self._realaddress) |
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547 |
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548 def printbanner(self, address): |
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549 # no "listening at" message should be printed to simulate hg behavior |
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550 pass |
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551 |
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552 def shouldexit(self): |
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553 if not self._issocketowner(): |
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554 self.ui.debug('%s is not owned, exiting.\n' % self._realaddress) |
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555 return True |
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556 if time.time() - self._lastactive > self._idletimeout: |
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557 self.ui.debug('being idle too long. exiting.\n') |
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558 return True |
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559 return False |
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560 |
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561 def newconnection(self): |
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562 self._lastactive = time.time() |
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563 |
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564 def createcmdserver(self, repo, conn, fin, fout): |
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565 return chgcmdserver(self.ui, repo, fin, fout, conn, |
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566 self._hashstate, self._baseaddress) |
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567 |
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568 def chgunixservice(ui, repo, opts): |
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569 # CHGINTERNALMARK is temporarily set by chg client to detect if chg will |
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570 # start another chg. drop it to avoid possible side effects. |
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571 if 'CHGINTERNALMARK' in encoding.environ: |
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572 del encoding.environ['CHGINTERNALMARK'] |
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573 |
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574 if repo: |
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575 # one chgserver can serve multiple repos. drop repo information |
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576 ui.setconfig('bundle', 'mainreporoot', '', 'repo') |
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577 h = chgunixservicehandler(ui) |
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578 return commandserver.unixforkingservice(ui, repo=None, opts=opts, handler=h) |