Mercurial > hg
annotate mercurial/hook.py @ 26402:05871262acd5
treemanifest: rework lazy-copying code (issue4840)
The old lazy-copy code formed a chain of copied manifests with each
copy. Under typical operation, the stack never got more than a couple
of manifests deep and was fine. Under conditions like hgsubversion or
convert, the stack could get hundreds of manifests deep, and
eventually overflow the recursion limit for Python. I was able to
consistently reproduce this by converting an hgsubversion clone of
svn's history to treemanifests.
This may result in fewer manifests staying in memory during operations
like convert when treemanifests are in use, and should make those
operations faster since there will be significantly fewer noop
function calls going on.
A previous attempt (never mailed) of mine to fix this problem tried to
simply have all treemanifests only have a loadfunc - that caused
somewhat weird problems because the gettext() callable passed into
read() wasn't idempotent, so the easy solution is to have a loadfunc
and a copyfunc.
author | Augie Fackler <augie@google.com> |
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date | Fri, 25 Sep 2015 22:54:46 -0400 |
parents | d15b279ddade |
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1 # hook.py - hook support for mercurial |
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2 # |
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3 # Copyright 2007 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 |
10263 | 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 os |
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11 import sys |
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12 import time |
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13 |
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14 from .i18n import _ |
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15 from . import ( |
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16 demandimport, |
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17 error, |
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18 extensions, |
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19 util, |
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20 ) |
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21 |
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22 def _pythonhook(ui, repo, name, hname, funcname, args, throw): |
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23 '''call python hook. hook is callable object, looked up as |
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24 name in python module. if callable returns "true", hook |
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25 fails, else passes. if hook raises exception, treated as |
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26 hook failure. exception propagates if throw is "true". |
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27 |
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28 reason for "true" meaning "hook failed" is so that |
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29 unmodified commands (e.g. mercurial.commands.update) can |
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30 be run as hooks without wrappers to convert return values.''' |
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31 |
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32 if callable(funcname): |
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33 obj = funcname |
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34 funcname = obj.__module__ + "." + obj.__name__ |
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35 else: |
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36 d = funcname.rfind('.') |
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37 if d == -1: |
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38 raise util.Abort(_('%s hook is invalid ("%s" not in ' |
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39 'a module)') % (hname, funcname)) |
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40 modname = funcname[:d] |
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41 oldpaths = sys.path |
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42 if util.mainfrozen(): |
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43 # binary installs require sys.path manipulation |
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44 modpath, modfile = os.path.split(modname) |
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45 if modpath and modfile: |
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46 sys.path = sys.path[:] + [modpath] |
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47 modname = modfile |
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48 with demandimport.deactivated(): |
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49 try: |
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50 obj = __import__(modname) |
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51 except ImportError: |
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52 e1 = sys.exc_type, sys.exc_value, sys.exc_traceback |
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53 try: |
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54 # extensions are loaded with hgext_ prefix |
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55 obj = __import__("hgext_%s" % modname) |
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56 except ImportError: |
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57 e2 = sys.exc_type, sys.exc_value, sys.exc_traceback |
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58 if ui.tracebackflag: |
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59 ui.warn(_('exception from first failed import ' |
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60 'attempt:\n')) |
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61 ui.traceback(e1) |
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62 if ui.tracebackflag: |
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63 ui.warn(_('exception from second failed import ' |
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64 'attempt:\n')) |
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65 ui.traceback(e2) |
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66 raise util.Abort(_('%s hook is invalid ' |
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67 '(import of "%s" failed)') % |
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68 (hname, modname)) |
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69 sys.path = oldpaths |
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70 try: |
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71 for p in funcname.split('.')[1:]: |
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72 obj = getattr(obj, p) |
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73 except AttributeError: |
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74 raise util.Abort(_('%s hook is invalid ' |
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75 '("%s" is not defined)') % |
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76 (hname, funcname)) |
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77 if not callable(obj): |
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78 raise util.Abort(_('%s hook is invalid ' |
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79 '("%s" is not callable)') % |
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80 (hname, funcname)) |
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81 |
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82 ui.note(_("calling hook %s: %s\n") % (hname, funcname)) |
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83 starttime = time.time() |
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84 |
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85 try: |
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86 # redirect IO descriptors to the ui descriptors so hooks |
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87 # that write directly to these don't mess up the command |
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88 # protocol when running through the command server |
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89 old = sys.stdout, sys.stderr, sys.stdin |
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90 sys.stdout, sys.stderr, sys.stdin = ui.fout, ui.ferr, ui.fin |
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91 |
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92 r = obj(ui=ui, repo=repo, hooktype=name, **args) |
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93 except Exception as exc: |
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94 if isinstance(exc, util.Abort): |
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95 ui.warn(_('error: %s hook failed: %s\n') % |
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96 (hname, exc.args[0])) |
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97 else: |
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98 ui.warn(_('error: %s hook raised an exception: ' |
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99 '%s\n') % (hname, exc)) |
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100 if throw: |
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101 raise |
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102 ui.traceback() |
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103 return True |
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104 finally: |
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105 sys.stdout, sys.stderr, sys.stdin = old |
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106 duration = time.time() - starttime |
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107 ui.log('pythonhook', 'pythonhook-%s: %s finished in %0.2f seconds\n', |
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108 name, funcname, duration) |
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109 if r: |
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110 if throw: |
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111 raise error.HookAbort(_('%s hook failed') % hname) |
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112 ui.warn(_('warning: %s hook failed\n') % hname) |
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113 return r |
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114 |
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115 def _exthook(ui, repo, name, cmd, args, throw): |
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116 ui.note(_("running hook %s: %s\n") % (name, cmd)) |
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117 |
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118 starttime = time.time() |
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119 env = {} |
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120 for k, v in args.iteritems(): |
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121 if callable(v): |
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122 v = v() |
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123 if isinstance(v, dict): |
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124 # make the dictionary element order stable across Python |
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125 # implementations |
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126 v = ('{' + |
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127 ', '.join('%r: %r' % i for i in sorted(v.iteritems())) + |
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128 '}') |
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129 env['HG_' + k.upper()] = v |
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130 |
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131 if repo: |
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132 cwd = repo.root |
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133 else: |
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134 cwd = os.getcwd() |
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135 r = ui.system(cmd, environ=env, cwd=cwd) |
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136 |
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137 duration = time.time() - starttime |
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138 ui.log('exthook', 'exthook-%s: %s finished in %0.2f seconds\n', |
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139 name, cmd, duration) |
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140 if r: |
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141 desc, r = util.explainexit(r) |
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142 if throw: |
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143 raise error.HookAbort(_('%s hook %s') % (name, desc)) |
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144 ui.warn(_('warning: %s hook %s\n') % (name, desc)) |
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145 return r |
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146 |
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147 def _allhooks(ui): |
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148 hooks = [] |
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149 for name, cmd in ui.configitems('hooks'): |
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150 if not name.startswith('priority'): |
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151 priority = ui.configint('hooks', 'priority.%s' % name, 0) |
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152 hooks.append((-priority, len(hooks), name, cmd)) |
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153 return [(k, v) for p, o, k, v in sorted(hooks)] |
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154 |
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155 _redirect = False |
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156 def redirect(state): |
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157 global _redirect |
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158 _redirect = state |
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159 |
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160 def hook(ui, repo, name, throw=False, **args): |
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161 if not ui.callhooks: |
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162 return False |
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163 |
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164 r = False |
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165 oldstdout = -1 |
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166 |
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167 try: |
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168 for hname, cmd in _allhooks(ui): |
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169 if hname.split('.')[0] != name or not cmd: |
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170 continue |
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171 |
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172 if oldstdout == -1 and _redirect: |
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173 try: |
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174 stdoutno = sys.__stdout__.fileno() |
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175 stderrno = sys.__stderr__.fileno() |
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176 # temporarily redirect stdout to stderr, if possible |
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177 if stdoutno >= 0 and stderrno >= 0: |
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178 sys.__stdout__.flush() |
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179 oldstdout = os.dup(stdoutno) |
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180 os.dup2(stderrno, stdoutno) |
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181 except (OSError, AttributeError): |
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182 # files seem to be bogus, give up on redirecting (WSGI, etc) |
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183 pass |
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184 |
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185 if callable(cmd): |
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186 r = _pythonhook(ui, repo, name, hname, cmd, args, throw) or r |
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187 elif cmd.startswith('python:'): |
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188 if cmd.count(':') >= 2: |
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189 path, cmd = cmd[7:].rsplit(':', 1) |
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190 path = util.expandpath(path) |
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191 if repo: |
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192 path = os.path.join(repo.root, path) |
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193 try: |
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194 mod = extensions.loadpath(path, 'hghook.%s' % hname) |
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195 except Exception: |
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196 ui.write(_("loading %s hook failed:\n") % hname) |
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197 raise |
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198 hookfn = getattr(mod, cmd) |
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199 else: |
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200 hookfn = cmd[7:].strip() |
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201 r = _pythonhook(ui, repo, name, hname, hookfn, args, throw) or r |
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202 else: |
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203 r = _exthook(ui, repo, hname, cmd, args, throw) or r |
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204 |
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205 # The stderr is fully buffered on Windows when connected to a pipe. |
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206 # A forcible flush is required to make small stderr data in the |
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207 # remote side available to the client immediately. |
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208 sys.stderr.flush() |
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209 finally: |
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210 if _redirect and oldstdout >= 0: |
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211 os.dup2(oldstdout, stdoutno) |
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212 os.close(oldstdout) |
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213 |
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214 return r |