Mercurial > hg
annotate mercurial/hook.py @ 28108:2a71d9483199
hook: for python hook exceptions, add note to run with --traceback
Just like with ImportErrors, it isn't obvious that --traceback will produce
helpful debugging output here.
author | Siddharth Agarwal <sid0@fb.com> |
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date | Fri, 12 Feb 2016 11:44:35 -0800 |
parents | cedbe8723d99 |
children | b892e424f88c |
rev | line source |
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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 error.HookLoadError( |
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39 _('%s hook is invalid: "%s" not in a module') |
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40 % (hname, funcname)) |
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41 modname = funcname[:d] |
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42 oldpaths = sys.path |
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43 if util.mainfrozen(): |
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44 # binary installs require sys.path manipulation |
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45 modpath, modfile = os.path.split(modname) |
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46 if modpath and modfile: |
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47 sys.path = sys.path[:] + [modpath] |
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48 modname = modfile |
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49 with demandimport.deactivated(): |
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50 try: |
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51 obj = __import__(modname) |
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52 except ImportError: |
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53 e1 = sys.exc_info() |
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54 try: |
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55 # extensions are loaded with hgext_ prefix |
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56 obj = __import__("hgext_%s" % modname) |
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57 except ImportError: |
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58 e2 = sys.exc_info() |
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59 if ui.tracebackflag: |
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60 ui.warn(_('exception from first failed import ' |
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61 'attempt:\n')) |
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62 ui.traceback(e1) |
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63 if ui.tracebackflag: |
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64 ui.warn(_('exception from second failed import ' |
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65 'attempt:\n')) |
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66 ui.traceback(e2) |
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67 |
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68 if not ui.tracebackflag: |
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69 tracebackhint = _( |
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70 'run with --traceback for stack trace') |
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71 else: |
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72 tracebackhint = None |
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73 raise error.HookLoadError( |
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74 _('%s hook is invalid: import of "%s" failed') % |
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75 (hname, modname), hint=tracebackhint) |
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76 sys.path = oldpaths |
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77 try: |
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78 for p in funcname.split('.')[1:]: |
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79 obj = getattr(obj, p) |
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80 except AttributeError: |
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81 raise error.HookLoadError( |
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82 _('%s hook is invalid: "%s" is not defined') |
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83 % (hname, funcname)) |
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84 if not callable(obj): |
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85 raise error.HookLoadError( |
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86 _('%s hook is invalid: "%s" is not callable') |
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87 % (hname, funcname)) |
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88 |
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89 ui.note(_("calling hook %s: %s\n") % (hname, funcname)) |
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90 starttime = time.time() |
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91 |
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92 try: |
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93 # redirect IO descriptors to the ui descriptors so hooks |
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94 # that write directly to these don't mess up the command |
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95 # protocol when running through the command server |
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96 old = sys.stdout, sys.stderr, sys.stdin |
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97 sys.stdout, sys.stderr, sys.stdin = ui.fout, ui.ferr, ui.fin |
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98 |
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99 r = obj(ui=ui, repo=repo, hooktype=name, **args) |
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100 except Exception as exc: |
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101 if isinstance(exc, error.Abort): |
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102 ui.warn(_('error: %s hook failed: %s\n') % |
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103 (hname, exc.args[0])) |
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104 else: |
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105 ui.warn(_('error: %s hook raised an exception: ' |
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106 '%s\n') % (hname, exc)) |
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107 if throw: |
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108 raise |
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109 if not ui.tracebackflag: |
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110 ui.warn(_('(run with --traceback for stack trace)\n')) |
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111 ui.traceback() |
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112 return True, True |
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113 finally: |
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114 sys.stdout, sys.stderr, sys.stdin = old |
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115 duration = time.time() - starttime |
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116 ui.log('pythonhook', 'pythonhook-%s: %s finished in %0.2f seconds\n', |
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117 name, funcname, duration) |
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118 if r: |
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119 if throw: |
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120 raise error.HookAbort(_('%s hook failed') % hname) |
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121 ui.warn(_('warning: %s hook failed\n') % hname) |
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122 return r, False |
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123 |
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124 def _exthook(ui, repo, name, cmd, args, throw): |
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125 ui.note(_("running hook %s: %s\n") % (name, cmd)) |
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126 |
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127 starttime = time.time() |
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128 env = {} |
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129 |
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130 # make in-memory changes visible to external process |
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131 if repo is not None: |
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132 tr = repo.currenttransaction() |
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133 repo.dirstate.write(tr) |
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134 if tr and tr.writepending(): |
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135 env['HG_PENDING'] = repo.root |
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136 |
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137 for k, v in args.iteritems(): |
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138 if callable(v): |
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139 v = v() |
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140 if isinstance(v, dict): |
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141 # make the dictionary element order stable across Python |
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142 # implementations |
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143 v = ('{' + |
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144 ', '.join('%r: %r' % i for i in sorted(v.iteritems())) + |
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145 '}') |
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146 env['HG_' + k.upper()] = v |
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147 |
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148 if repo: |
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149 cwd = repo.root |
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150 else: |
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151 cwd = os.getcwd() |
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152 r = ui.system(cmd, environ=env, cwd=cwd) |
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153 |
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154 duration = time.time() - starttime |
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155 ui.log('exthook', 'exthook-%s: %s finished in %0.2f seconds\n', |
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156 name, cmd, duration) |
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157 if r: |
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158 desc, r = util.explainexit(r) |
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159 if throw: |
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160 raise error.HookAbort(_('%s hook %s') % (name, desc)) |
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161 ui.warn(_('warning: %s hook %s\n') % (name, desc)) |
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162 return r |
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163 |
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164 def _allhooks(ui): |
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165 hooks = [] |
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166 for name, cmd in ui.configitems('hooks'): |
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167 if not name.startswith('priority'): |
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168 priority = ui.configint('hooks', 'priority.%s' % name, 0) |
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169 hooks.append((-priority, len(hooks), name, cmd)) |
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170 return [(k, v) for p, o, k, v in sorted(hooks)] |
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171 |
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172 _redirect = False |
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173 def redirect(state): |
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174 global _redirect |
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175 _redirect = state |
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176 |
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177 def hook(ui, repo, name, throw=False, **args): |
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178 if not ui.callhooks: |
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179 return False |
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180 |
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181 hooks = [] |
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182 for hname, cmd in _allhooks(ui): |
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183 if hname.split('.')[0] == name and cmd: |
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184 hooks.append((hname, cmd)) |
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185 |
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186 res = runhooks(ui, repo, name, hooks, throw=throw, **args) |
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187 r = False |
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188 for hname, cmd in hooks: |
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189 r = res[hname][0] or r |
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190 return r |
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191 |
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192 def runhooks(ui, repo, name, hooks, throw=False, **args): |
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193 res = {} |
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194 oldstdout = -1 |
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195 |
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196 try: |
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197 for hname, cmd in hooks: |
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198 if oldstdout == -1 and _redirect: |
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199 try: |
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200 stdoutno = sys.__stdout__.fileno() |
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201 stderrno = sys.__stderr__.fileno() |
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202 # temporarily redirect stdout to stderr, if possible |
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203 if stdoutno >= 0 and stderrno >= 0: |
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204 sys.__stdout__.flush() |
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205 oldstdout = os.dup(stdoutno) |
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206 os.dup2(stderrno, stdoutno) |
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207 except (OSError, AttributeError): |
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208 # files seem to be bogus, give up on redirecting (WSGI, etc) |
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209 pass |
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210 |
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211 if callable(cmd): |
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212 r, raised = _pythonhook(ui, repo, name, hname, cmd, args, throw) |
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213 elif cmd.startswith('python:'): |
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214 if cmd.count(':') >= 2: |
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215 path, cmd = cmd[7:].rsplit(':', 1) |
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216 path = util.expandpath(path) |
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217 if repo: |
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218 path = os.path.join(repo.root, path) |
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219 try: |
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220 mod = extensions.loadpath(path, 'hghook.%s' % hname) |
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221 except Exception: |
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222 ui.write(_("loading %s hook failed:\n") % hname) |
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223 raise |
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224 hookfn = getattr(mod, cmd) |
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225 else: |
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226 hookfn = cmd[7:].strip() |
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227 r, raised = _pythonhook(ui, repo, name, hname, hookfn, args, |
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228 throw) |
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229 else: |
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230 r = _exthook(ui, repo, hname, cmd, args, throw) |
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231 raised = False |
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232 |
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233 res[hname] = r, raised |
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234 |
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235 # The stderr is fully buffered on Windows when connected to a pipe. |
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236 # A forcible flush is required to make small stderr data in the |
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237 # remote side available to the client immediately. |
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238 sys.stderr.flush() |
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239 finally: |
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240 if _redirect and oldstdout >= 0: |
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241 os.dup2(oldstdout, stdoutno) |
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242 os.close(oldstdout) |
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243 |
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244 return res |