Mercurial > hg
annotate mercurial/commandserver.py @ 29268:f200b58497f1
sslutil: reference appropriate config section in messaging
Error messages reference the config section defining the host
fingerprint. Now that we have multiple sections where this config
setting could live, we need to point the user at the appropriate
one.
We default to the new "hostsecurity" section. But we will still
refer them to the "hostfingerprint" section if a value is defined
there.
There are some corner cases where the messaging might be off. e.g.
they could define a SHA-1 fingerprint in both sections. IMO the
messaging needs a massive overhaul. I plan to do this as part
of future refactoring to security settings.
author | Gregory Szorc <gregory.szorc@gmail.com> |
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date | Sat, 28 May 2016 12:58:46 -0700 |
parents | ff5f923fca3c |
children | d269e7db2f55 |
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1 # commandserver.py - communicate with Mercurial's API over a pipe |
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2 # |
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3 # Copyright Matt Mackall <mpm@selenic.com> |
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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 from __future__ import absolute_import |
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9 |
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10 import SocketServer |
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11 import errno |
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12 import os |
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13 import struct |
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14 import sys |
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15 import traceback |
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16 |
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17 from .i18n import _ |
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18 from . import ( |
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19 encoding, |
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20 error, |
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21 util, |
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22 ) |
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23 |
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24 logfile = None |
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25 |
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26 def log(*args): |
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27 if not logfile: |
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28 return |
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29 |
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30 for a in args: |
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31 logfile.write(str(a)) |
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32 |
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33 logfile.flush() |
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34 |
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35 class channeledoutput(object): |
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36 """ |
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37 Write data to out in the following format: |
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38 |
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39 data length (unsigned int), |
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40 data |
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41 """ |
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42 def __init__(self, out, channel): |
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43 self.out = out |
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44 self.channel = channel |
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45 |
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46 @property |
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47 def name(self): |
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48 return '<%c-channel>' % self.channel |
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49 |
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50 def write(self, data): |
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51 if not data: |
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52 return |
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53 self.out.write(struct.pack('>cI', self.channel, len(data))) |
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54 self.out.write(data) |
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55 self.out.flush() |
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56 |
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57 def __getattr__(self, attr): |
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58 if attr in ('isatty', 'fileno', 'tell', 'seek'): |
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59 raise AttributeError(attr) |
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60 return getattr(self.out, attr) |
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61 |
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62 class channeledinput(object): |
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63 """ |
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64 Read data from in_. |
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65 |
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66 Requests for input are written to out in the following format: |
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67 channel identifier - 'I' for plain input, 'L' line based (1 byte) |
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68 how many bytes to send at most (unsigned int), |
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69 |
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70 The client replies with: |
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71 data length (unsigned int), 0 meaning EOF |
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72 data |
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73 """ |
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74 |
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75 maxchunksize = 4 * 1024 |
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76 |
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77 def __init__(self, in_, out, channel): |
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78 self.in_ = in_ |
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79 self.out = out |
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80 self.channel = channel |
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81 |
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82 @property |
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83 def name(self): |
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84 return '<%c-channel>' % self.channel |
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85 |
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86 def read(self, size=-1): |
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87 if size < 0: |
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88 # if we need to consume all the clients input, ask for 4k chunks |
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89 # so the pipe doesn't fill up risking a deadlock |
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90 size = self.maxchunksize |
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91 s = self._read(size, self.channel) |
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92 buf = s |
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93 while s: |
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94 s = self._read(size, self.channel) |
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95 buf += s |
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96 |
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97 return buf |
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98 else: |
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99 return self._read(size, self.channel) |
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100 |
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101 def _read(self, size, channel): |
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102 if not size: |
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103 return '' |
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104 assert size > 0 |
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105 |
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106 # tell the client we need at most size bytes |
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107 self.out.write(struct.pack('>cI', channel, size)) |
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108 self.out.flush() |
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109 |
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110 length = self.in_.read(4) |
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111 length = struct.unpack('>I', length)[0] |
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112 if not length: |
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113 return '' |
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114 else: |
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115 return self.in_.read(length) |
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116 |
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117 def readline(self, size=-1): |
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118 if size < 0: |
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119 size = self.maxchunksize |
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120 s = self._read(size, 'L') |
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121 buf = s |
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122 # keep asking for more until there's either no more or |
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123 # we got a full line |
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124 while s and s[-1] != '\n': |
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125 s = self._read(size, 'L') |
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126 buf += s |
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127 |
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128 return buf |
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129 else: |
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130 return self._read(size, 'L') |
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131 |
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132 def __iter__(self): |
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133 return self |
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134 |
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135 def next(self): |
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136 l = self.readline() |
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137 if not l: |
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138 raise StopIteration |
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139 return l |
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140 |
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141 def __getattr__(self, attr): |
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142 if attr in ('isatty', 'fileno', 'tell', 'seek'): |
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143 raise AttributeError(attr) |
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144 return getattr(self.in_, attr) |
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145 |
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146 class server(object): |
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147 """ |
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148 Listens for commands on fin, runs them and writes the output on a channel |
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149 based stream to fout. |
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150 """ |
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151 def __init__(self, ui, repo, fin, fout): |
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152 self.cwd = os.getcwd() |
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153 |
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154 # developer config: cmdserver.log |
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155 logpath = ui.config("cmdserver", "log", None) |
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156 if logpath: |
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157 global logfile |
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158 if logpath == '-': |
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159 # write log on a special 'd' (debug) channel |
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160 logfile = channeledoutput(fout, 'd') |
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161 else: |
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162 logfile = open(logpath, 'a') |
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163 |
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164 if repo: |
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165 # the ui here is really the repo ui so take its baseui so we don't |
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166 # end up with its local configuration |
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167 self.ui = repo.baseui |
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168 self.repo = repo |
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169 self.repoui = repo.ui |
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170 else: |
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171 self.ui = ui |
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172 self.repo = self.repoui = None |
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173 |
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174 self.cerr = channeledoutput(fout, 'e') |
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175 self.cout = channeledoutput(fout, 'o') |
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176 self.cin = channeledinput(fin, fout, 'I') |
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177 self.cresult = channeledoutput(fout, 'r') |
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178 |
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179 self.client = fin |
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180 |
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181 def _read(self, size): |
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182 if not size: |
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183 return '' |
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184 |
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185 data = self.client.read(size) |
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186 |
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187 # is the other end closed? |
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188 if not data: |
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189 raise EOFError |
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190 |
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191 return data |
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192 |
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193 def _readstr(self): |
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194 """read a string from the channel |
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195 |
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196 format: |
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197 data length (uint32), data |
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198 """ |
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199 length = struct.unpack('>I', self._read(4))[0] |
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200 if not length: |
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201 return '' |
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202 return self._read(length) |
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203 |
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204 def _readlist(self): |
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205 """read a list of NULL separated strings from the channel""" |
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206 s = self._readstr() |
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207 if s: |
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208 return s.split('\0') |
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209 else: |
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210 return [] |
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211 |
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212 def runcommand(self): |
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213 """ reads a list of \0 terminated arguments, executes |
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214 and writes the return code to the result channel """ |
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215 from . import dispatch # avoid cycle |
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216 |
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218 |
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219 # copy the uis so changes (e.g. --config or --verbose) don't |
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220 # persist between requests |
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221 copiedui = self.ui.copy() |
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222 uis = [copiedui] |
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223 if self.repo: |
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224 self.repo.baseui = copiedui |
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225 # clone ui without using ui.copy because this is protected |
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226 repoui = self.repoui.__class__(self.repoui) |
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227 repoui.copy = copiedui.copy # redo copy protection |
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228 uis.append(repoui) |
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229 self.repo.ui = self.repo.dirstate._ui = repoui |
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230 self.repo.invalidateall() |
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231 |
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232 # reset last-print time of progress bar per command |
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233 # (progbar is singleton, we don't have to do for all uis) |
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234 if copiedui._progbar: |
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235 copiedui._progbar.resetstate() |
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236 |
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237 for ui in uis: |
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238 # any kind of interaction must use server channels, but chg may |
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239 # replace channels by fully functional tty files. so nontty is |
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240 # enforced only if cin is a channel. |
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241 if not util.safehasattr(self.cin, 'fileno'): |
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242 ui.setconfig('ui', 'nontty', 'true', 'commandserver') |
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243 |
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244 req = dispatch.request(args[:], copiedui, self.repo, self.cin, |
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245 self.cout, self.cerr) |
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246 |
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247 ret = (dispatch.dispatch(req) or 0) & 255 # might return None |
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248 |
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249 # restore old cwd |
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250 if '--cwd' in args: |
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251 os.chdir(self.cwd) |
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252 |
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253 self.cresult.write(struct.pack('>i', int(ret))) |
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254 |
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255 def getencoding(self): |
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256 """ writes the current encoding to the result channel """ |
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257 self.cresult.write(encoding.encoding) |
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258 |
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259 def serveone(self): |
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260 cmd = self.client.readline()[:-1] |
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261 if cmd: |
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262 handler = self.capabilities.get(cmd) |
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263 if handler: |
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264 handler(self) |
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265 else: |
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266 # clients are expected to check what commands are supported by |
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267 # looking at the servers capabilities |
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268 raise error.Abort(_('unknown command %s') % cmd) |
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269 |
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270 return cmd != '' |
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271 |
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272 capabilities = {'runcommand' : runcommand, |
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273 'getencoding' : getencoding} |
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274 |
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275 def serve(self): |
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276 hellomsg = 'capabilities: ' + ' '.join(sorted(self.capabilities)) |
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277 hellomsg += '\n' |
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278 hellomsg += 'encoding: ' + encoding.encoding |
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279 hellomsg += '\n' |
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280 hellomsg += 'pid: %d' % util.getpid() |
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281 |
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282 # write the hello msg in -one- chunk |
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283 self.cout.write(hellomsg) |
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284 |
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285 try: |
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286 while self.serveone(): |
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287 pass |
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288 except EOFError: |
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289 # we'll get here if the client disconnected while we were reading |
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290 # its request |
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291 return 1 |
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292 |
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293 return 0 |
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294 |
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295 def _protectio(ui): |
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296 """ duplicates streams and redirect original to null if ui uses stdio """ |
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297 ui.flush() |
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298 newfiles = [] |
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299 nullfd = os.open(os.devnull, os.O_RDWR) |
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300 for f, sysf, mode in [(ui.fin, sys.stdin, 'rb'), |
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301 (ui.fout, sys.stdout, 'wb')]: |
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302 if f is sysf: |
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303 newfd = os.dup(f.fileno()) |
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304 os.dup2(nullfd, f.fileno()) |
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305 f = os.fdopen(newfd, mode) |
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306 newfiles.append(f) |
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307 os.close(nullfd) |
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308 return tuple(newfiles) |
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309 |
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310 def _restoreio(ui, fin, fout): |
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311 """ restores streams from duplicated ones """ |
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312 ui.flush() |
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313 for f, uif in [(fin, ui.fin), (fout, ui.fout)]: |
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314 if f is not uif: |
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315 os.dup2(f.fileno(), uif.fileno()) |
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316 f.close() |
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317 |
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318 class pipeservice(object): |
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319 def __init__(self, ui, repo, opts): |
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320 self.ui = ui |
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321 self.repo = repo |
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322 |
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323 def init(self): |
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324 pass |
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325 |
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326 def run(self): |
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327 ui = self.ui |
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328 # redirect stdio to null device so that broken extensions or in-process |
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329 # hooks will never cause corruption of channel protocol. |
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330 fin, fout = _protectio(ui) |
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331 try: |
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332 sv = server(ui, self.repo, fin, fout) |
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333 return sv.serve() |
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334 finally: |
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335 _restoreio(ui, fin, fout) |
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336 |
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337 class _requesthandler(SocketServer.StreamRequestHandler): |
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338 def handle(self): |
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339 ui = self.server.ui |
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340 repo = self.server.repo |
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341 sv = None |
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342 try: |
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343 sv = server(ui, repo, self.rfile, self.wfile) |
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344 try: |
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345 sv.serve() |
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346 # handle exceptions that may be raised by command server. most of |
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347 # known exceptions are caught by dispatch. |
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348 except error.Abort as inst: |
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349 ui.warn(_('abort: %s\n') % inst) |
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global: mass rewrite to use modern exception syntax
Gregory Szorc <gregory.szorc@gmail.com>
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350 except IOError as inst: |
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351 if inst.errno != errno.EPIPE: |
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352 raise |
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353 except KeyboardInterrupt: |
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354 pass |
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355 except: # re-raises |
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356 # also write traceback to error channel. otherwise client cannot |
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357 # see it because it is written to server's stderr by default. |
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cmdserver: write early exception to 'e' channel in 'unix' mode
Yuya Nishihara <yuya@tcha.org>
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358 if sv: |
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359 cerr = sv.cerr |
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360 else: |
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361 cerr = channeledoutput(self.wfile, 'e') |
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362 traceback.print_exc(file=cerr) |
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363 raise |
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364 |
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365 class unixservice(object): |
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366 """ |
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367 Listens on unix domain socket and forks server per connection |
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368 """ |
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369 def __init__(self, ui, repo, opts): |
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370 self.ui = ui |
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371 self.repo = repo |
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372 self.address = opts['address'] |
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373 if not util.safehasattr(SocketServer, 'UnixStreamServer'): |
26587
56b2bcea2529
error: get Abort from 'error' instead of 'util'
Pierre-Yves David <pierre-yves.david@fb.com>
parents:
25832
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374 raise error.Abort(_('unsupported platform')) |
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375 if not self.address: |
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Pierre-Yves David <pierre-yves.david@fb.com>
parents:
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376 raise error.Abort(_('no socket path specified with --address')) |
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377 |
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378 def init(self): |
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379 class cls(SocketServer.ForkingMixIn, SocketServer.UnixStreamServer): |
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380 ui = self.ui |
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381 repo = self.repo |
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382 self.server = cls(self.address, _requesthandler) |
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383 self.ui.status(_('listening at %s\n') % self.address) |
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384 self.ui.flush() # avoid buffering of status message |
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385 |
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386 def run(self): |
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387 try: |
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388 self.server.serve_forever() |
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389 finally: |
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390 os.unlink(self.address) |
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391 |
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392 _servicemap = { |
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393 'pipe': pipeservice, |
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394 'unix': unixservice, |
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395 } |
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396 |
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397 def createservice(ui, repo, opts): |
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398 mode = opts['cmdserver'] |
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399 try: |
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400 return _servicemap[mode](ui, repo, opts) |
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401 except KeyError: |
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Pierre-Yves David <pierre-yves.david@fb.com>
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402 raise error.Abort(_('unknown mode %s') % mode) |