annotate mercurial/hook.py @ 12957:9f2ac318b92e

util: clarify purpose of MBTextWrapper class It's easy to get confused and scared of an Unicode monster when skimming through this code: document that this is really just about column-counting.
author Nicolas Dumazet <nicdumz.commits@gmail.com>
date Tue, 09 Nov 2010 13:43:35 +0900
parents c37f35d7f2f5
children 789e0fa2fcea
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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
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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 i18n import _
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9 import os, sys
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10 import extensions, util
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11
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12 def _pythonhook(ui, repo, name, hname, funcname, args, throw):
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13 '''call python hook. hook is callable object, looked up as
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14 name in python module. if callable returns "true", hook
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15 fails, else passes. if hook raises exception, treated as
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16 hook failure. exception propagates if throw is "true".
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17
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18 reason for "true" meaning "hook failed" is so that
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19 unmodified commands (e.g. mercurial.commands.update) can
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20 be run as hooks without wrappers to convert return values.'''
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21
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22 ui.note(_("calling hook %s: %s\n") % (hname, funcname))
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23 obj = funcname
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24 if not hasattr(obj, '__call__'):
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25 d = funcname.rfind('.')
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26 if d == -1:
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27 raise util.Abort(_('%s hook is invalid ("%s" not in '
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28 'a module)') % (hname, funcname))
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29 modname = funcname[:d]
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30 oldpaths = sys.path
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31 if hasattr(sys, "frozen"):
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32 # binary installs require sys.path manipulation
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33 modpath, modfile = os.path.split(modname)
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34 if modpath and modfile:
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35 sys.path = sys.path[:] + [modpath]
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36 modname = modfile
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37 try:
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38 obj = __import__(modname)
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39 except ImportError:
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40 e1 = sys.exc_type, sys.exc_value, sys.exc_traceback
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41 try:
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42 # extensions are loaded with hgext_ prefix
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43 obj = __import__("hgext_%s" % modname)
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44 except ImportError:
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45 e2 = sys.exc_type, sys.exc_value, sys.exc_traceback
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46 if ui.tracebackflag:
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47 ui.warn(_('exception from first failed import attempt:\n'))
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48 ui.traceback(e1)
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49 if ui.tracebackflag:
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50 ui.warn(_('exception from second failed import attempt:\n'))
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51 ui.traceback(e2)
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52 raise util.Abort(_('%s hook is invalid '
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53 '(import of "%s" failed)') %
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54 (hname, modname))
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55 sys.path = oldpaths
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56 try:
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57 for p in funcname.split('.')[1:]:
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58 obj = getattr(obj, p)
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59 except AttributeError:
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60 raise util.Abort(_('%s hook is invalid '
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61 '("%s" is not defined)') %
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62 (hname, funcname))
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63 if not hasattr(obj, '__call__'):
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64 raise util.Abort(_('%s hook is invalid '
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65 '("%s" is not callable)') %
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66 (hname, funcname))
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67 try:
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68 r = obj(ui=ui, repo=repo, hooktype=name, **args)
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69 except KeyboardInterrupt:
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70 raise
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71 except Exception, exc:
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72 if isinstance(exc, util.Abort):
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73 ui.warn(_('error: %s hook failed: %s\n') %
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74 (hname, exc.args[0]))
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75 else:
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76 ui.warn(_('error: %s hook raised an exception: '
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77 '%s\n') % (hname, exc))
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78 if throw:
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79 raise
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80 ui.traceback()
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81 return True
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82 if r:
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83 if throw:
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84 raise util.Abort(_('%s hook failed') % hname)
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85 ui.warn(_('warning: %s hook failed\n') % hname)
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86 return r
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87
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88 def _exthook(ui, repo, name, cmd, args, throw):
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89 ui.note(_("running hook %s: %s\n") % (name, cmd))
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90
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91 env = {}
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92 for k, v in args.iteritems():
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93 if hasattr(v, '__call__'):
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94 v = v()
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95 env['HG_' + k.upper()] = v
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96
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97 if repo:
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98 cwd = repo.root
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99 else:
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100 cwd = os.getcwd()
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101 if 'HG_URL' in env and env['HG_URL'].startswith('remote:http'):
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102 r = util.system(cmd, environ=env, cwd=cwd, out=ui)
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103 else:
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104 r = util.system(cmd, environ=env, cwd=cwd)
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105 if r:
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106 desc, r = util.explain_exit(r)
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107 if throw:
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108 raise util.Abort(_('%s hook %s') % (name, desc))
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109 ui.warn(_('warning: %s hook %s\n') % (name, desc))
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110 return r
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111
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112 _redirect = False
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113 def redirect(state):
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114 global _redirect
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115 _redirect = state
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116
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117 def hook(ui, repo, name, throw=False, **args):
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118 r = False
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119
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120 oldstdout = -1
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121 if _redirect:
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122 stdoutno = sys.__stdout__.fileno()
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123 stderrno = sys.__stderr__.fileno()
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124 # temporarily redirect stdout to stderr, if possible
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125 if stdoutno >= 0 and stderrno >= 0:
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126 oldstdout = os.dup(stdoutno)
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127 os.dup2(stderrno, stdoutno)
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128
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129 try:
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130 for hname, cmd in ui.configitems('hooks'):
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131 if hname.split('.')[0] != name or not cmd:
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132 continue
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133 if hasattr(cmd, '__call__'):
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134 r = _pythonhook(ui, repo, name, hname, cmd, args, throw) or r
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135 elif cmd.startswith('python:'):
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136 if cmd.count(':') >= 2:
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137 path, cmd = cmd[7:].rsplit(':', 1)
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138 mod = extensions.loadpath(path, 'hghook.%s' % hname)
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139 hookfn = getattr(mod, cmd)
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Alexander Solovyov <piranha@piranha.org.ua>
parents: 7787
diff changeset
140 else:
f779e1996e23 ability to load hooks from arbitrary python module
Alexander Solovyov <piranha@piranha.org.ua>
parents: 7787
diff changeset
141 hookfn = cmd[7:].strip()
f779e1996e23 ability to load hooks from arbitrary python module
Alexander Solovyov <piranha@piranha.org.ua>
parents: 7787
diff changeset
142 r = _pythonhook(ui, repo, name, hname, hookfn, args, throw) or r
7416
196b05a548d0 hooks: restore io correctly on exception
Jesse Long <jesse@virtualpostman.co.za>
parents: 7280
diff changeset
143 else:
196b05a548d0 hooks: restore io correctly on exception
Jesse Long <jesse@virtualpostman.co.za>
parents: 7280
diff changeset
144 r = _exthook(ui, repo, hname, cmd, args, throw) or r
196b05a548d0 hooks: restore io correctly on exception
Jesse Long <jesse@virtualpostman.co.za>
parents: 7280
diff changeset
145 finally:
9658
852b1f3032d2 hook: only redirect stdout if it and stderr are valid files
Sune Foldager <cryo@cyanite.org>
parents: 9332
diff changeset
146 if _redirect and oldstdout >= 0:
852b1f3032d2 hook: only redirect stdout if it and stderr are valid files
Sune Foldager <cryo@cyanite.org>
parents: 9332
diff changeset
147 os.dup2(oldstdout, stdoutno)
7416
196b05a548d0 hooks: restore io correctly on exception
Jesse Long <jesse@virtualpostman.co.za>
parents: 7280
diff changeset
148 os.close(oldstdout)
6266
9f76df0edb7d hook.py: fix redirections introduced by 323b9c55b328
Alexis S. L. Carvalho <alexis@cecm.usp.br>
parents: 5869
diff changeset
149
9f76df0edb7d hook.py: fix redirections introduced by 323b9c55b328
Alexis S. L. Carvalho <alexis@cecm.usp.br>
parents: 5869
diff changeset
150 return r