Mercurial > hg
annotate mercurial/chgserver.py @ 31758:04ec317b8128
hgweb: expose a followlines UI in filerevision view
In filerevision view (/file/<rev>/<fname>) we add some event listeners on
mouse clicks of <span> elements in the <pre class="sourcelines"> block.
Those listeners will capture a range of lines selected between two mouse
clicks and a box inviting to follow the history of selected lines will then
show up. Selected lines (i.e. the block of lines) get a CSS class which make
them highlighted. Selection can be cancelled (and restarted) by either
clicking on the cancel ("x") button in the invite box or clicking on any other
source line. Also clicking twice on the same line will abort the selection and
reset event listeners to restart the process.
As a first step, this action is only advertised by the "cursor: cell" CSS rule
on source lines elements as any other mechanisms would make the code
significantly more complicated. This might be improved later.
All JavaScript code lives in a new "linerangelog.js" file, sourced in
filerevision template (only in "paper" style for now).
author | Denis Laxalde <denis.laxalde@logilab.fr> |
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date | Wed, 29 Mar 2017 22:26:16 +0200 |
parents | d73490957d61 |
children | e518192d6bac |
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 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): |
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194 self._csystem(cmd, util.shellenviron(), 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. |
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393 """ |
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394 from . import dispatch # avoid cycle |
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395 |
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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 | |
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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() |
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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 |
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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 |
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469 def _tempaddress(address): |
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470 return '%s.%d.tmp' % (address, os.getpid()) |
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471 |
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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 |
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474 # makes it possible for the client to pass 'server.tmp$PID' and follow by |
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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] |
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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] |
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484 |
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485 def __init__(self, ui): |
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486 self.ui = ui |
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487 self._idletimeout = ui.configint('chgserver', 'idletimeout', 3600) |
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488 self._lastactive = time.time() |
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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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496 def _inithashstate(self, address): |
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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) |
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|
504 |
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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: |
30332
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spelling: fixes of non-dictionary words
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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) |