Mercurial > hg
annotate mercurial/win32.py @ 31586:df82f375fa00
checkheads: extract obsolete post processing in its own function
The checkheads function is long and complex, extract that logic in a subfunction
is win in itself. As the comment in the code says, this postprocessing is
currently very basic and either misbehave or fails to detect valid push in many
cases. My deeper motive for this extraction is to be make it easier to provide
extensive testing of this case and strategy to cover them. Final test and logic
will makes it to core once done.
author | Pierre-Yves David <pierre-yves.david@ens-lyon.org> |
---|---|
date | Tue, 21 Mar 2017 23:30:13 +0100 |
parents | 5861bdbeb9a3 |
children | 2d56e6d23be7 |
rev | line source |
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1 # win32.py - utility functions that use win32 API |
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2 # |
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3 # Copyright 2005-2009 Matt Mackall <mpm@selenic.com> and others |
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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 ctypes |
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11 import errno |
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12 import msvcrt |
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13 import os |
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14 import random |
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15 import subprocess |
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16 |
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17 from . import ( |
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18 encoding, |
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19 pycompat, |
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20 ) |
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21 |
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22 _kernel32 = ctypes.windll.kernel32 |
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23 _advapi32 = ctypes.windll.advapi32 |
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24 _user32 = ctypes.windll.user32 |
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25 |
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26 _BOOL = ctypes.c_long |
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27 _WORD = ctypes.c_ushort |
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28 _DWORD = ctypes.c_ulong |
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29 _UINT = ctypes.c_uint |
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30 _LONG = ctypes.c_long |
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31 _LPCSTR = _LPSTR = ctypes.c_char_p |
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32 _HANDLE = ctypes.c_void_p |
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33 _HWND = _HANDLE |
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34 |
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35 _INVALID_HANDLE_VALUE = _HANDLE(-1).value |
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36 |
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37 # GetLastError |
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38 _ERROR_SUCCESS = 0 |
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39 _ERROR_NO_MORE_FILES = 18 |
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40 _ERROR_INVALID_PARAMETER = 87 |
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41 _ERROR_BROKEN_PIPE = 109 |
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42 _ERROR_INSUFFICIENT_BUFFER = 122 |
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43 |
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44 # WPARAM is defined as UINT_PTR (unsigned type) |
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45 # LPARAM is defined as LONG_PTR (signed type) |
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46 if ctypes.sizeof(ctypes.c_long) == ctypes.sizeof(ctypes.c_void_p): |
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47 _WPARAM = ctypes.c_ulong |
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48 _LPARAM = ctypes.c_long |
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49 elif ctypes.sizeof(ctypes.c_longlong) == ctypes.sizeof(ctypes.c_void_p): |
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50 _WPARAM = ctypes.c_ulonglong |
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51 _LPARAM = ctypes.c_longlong |
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52 |
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53 class _FILETIME(ctypes.Structure): |
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54 _fields_ = [('dwLowDateTime', _DWORD), |
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55 ('dwHighDateTime', _DWORD)] |
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56 |
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57 class _BY_HANDLE_FILE_INFORMATION(ctypes.Structure): |
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58 _fields_ = [('dwFileAttributes', _DWORD), |
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59 ('ftCreationTime', _FILETIME), |
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60 ('ftLastAccessTime', _FILETIME), |
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61 ('ftLastWriteTime', _FILETIME), |
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62 ('dwVolumeSerialNumber', _DWORD), |
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63 ('nFileSizeHigh', _DWORD), |
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64 ('nFileSizeLow', _DWORD), |
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65 ('nNumberOfLinks', _DWORD), |
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66 ('nFileIndexHigh', _DWORD), |
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67 ('nFileIndexLow', _DWORD)] |
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68 |
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69 # CreateFile |
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70 _FILE_SHARE_READ = 0x00000001 |
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71 _FILE_SHARE_WRITE = 0x00000002 |
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72 _FILE_SHARE_DELETE = 0x00000004 |
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73 |
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74 _OPEN_EXISTING = 3 |
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75 |
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76 _FILE_FLAG_BACKUP_SEMANTICS = 0x02000000 |
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77 |
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78 # SetFileAttributes |
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79 _FILE_ATTRIBUTE_NORMAL = 0x80 |
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80 _FILE_ATTRIBUTE_NOT_CONTENT_INDEXED = 0x2000 |
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81 |
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82 # Process Security and Access Rights |
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83 _PROCESS_QUERY_INFORMATION = 0x0400 |
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84 |
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85 # GetExitCodeProcess |
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86 _STILL_ACTIVE = 259 |
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87 |
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88 class _STARTUPINFO(ctypes.Structure): |
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89 _fields_ = [('cb', _DWORD), |
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90 ('lpReserved', _LPSTR), |
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91 ('lpDesktop', _LPSTR), |
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92 ('lpTitle', _LPSTR), |
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93 ('dwX', _DWORD), |
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94 ('dwY', _DWORD), |
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95 ('dwXSize', _DWORD), |
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96 ('dwYSize', _DWORD), |
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97 ('dwXCountChars', _DWORD), |
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98 ('dwYCountChars', _DWORD), |
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99 ('dwFillAttribute', _DWORD), |
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100 ('dwFlags', _DWORD), |
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101 ('wShowWindow', _WORD), |
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102 ('cbReserved2', _WORD), |
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103 ('lpReserved2', ctypes.c_char_p), |
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104 ('hStdInput', _HANDLE), |
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105 ('hStdOutput', _HANDLE), |
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106 ('hStdError', _HANDLE)] |
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107 |
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108 class _PROCESS_INFORMATION(ctypes.Structure): |
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109 _fields_ = [('hProcess', _HANDLE), |
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110 ('hThread', _HANDLE), |
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111 ('dwProcessId', _DWORD), |
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112 ('dwThreadId', _DWORD)] |
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113 |
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114 _CREATE_NO_WINDOW = 0x08000000 |
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115 _SW_HIDE = 0 |
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116 |
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117 class _COORD(ctypes.Structure): |
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118 _fields_ = [('X', ctypes.c_short), |
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119 ('Y', ctypes.c_short)] |
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120 |
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121 class _SMALL_RECT(ctypes.Structure): |
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122 _fields_ = [('Left', ctypes.c_short), |
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123 ('Top', ctypes.c_short), |
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124 ('Right', ctypes.c_short), |
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125 ('Bottom', ctypes.c_short)] |
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126 |
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127 class _CONSOLE_SCREEN_BUFFER_INFO(ctypes.Structure): |
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128 _fields_ = [('dwSize', _COORD), |
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129 ('dwCursorPosition', _COORD), |
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130 ('wAttributes', _WORD), |
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131 ('srWindow', _SMALL_RECT), |
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132 ('dwMaximumWindowSize', _COORD)] |
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133 |
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134 _STD_ERROR_HANDLE = _DWORD(-12).value |
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135 |
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136 # CreateToolhelp32Snapshot, Process32First, Process32Next |
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137 _TH32CS_SNAPPROCESS = 0x00000002 |
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138 _MAX_PATH = 260 |
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139 |
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140 class _tagPROCESSENTRY32(ctypes.Structure): |
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141 _fields_ = [('dwsize', _DWORD), |
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142 ('cntUsage', _DWORD), |
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143 ('th32ProcessID', _DWORD), |
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144 ('th32DefaultHeapID', ctypes.c_void_p), |
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145 ('th32ModuleID', _DWORD), |
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146 ('cntThreads', _DWORD), |
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147 ('th32ParentProcessID', _DWORD), |
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148 ('pcPriClassBase', _LONG), |
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149 ('dwFlags', _DWORD), |
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150 ('szExeFile', ctypes.c_char * _MAX_PATH)] |
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151 |
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152 def __init__(self): |
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153 super(_tagPROCESSENTRY32, self).__init__() |
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154 self.dwsize = ctypes.sizeof(self) |
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155 |
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156 |
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157 # types of parameters of C functions used (required by pypy) |
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158 |
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159 _kernel32.CreateFileA.argtypes = [_LPCSTR, _DWORD, _DWORD, ctypes.c_void_p, |
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160 _DWORD, _DWORD, _HANDLE] |
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161 _kernel32.CreateFileA.restype = _HANDLE |
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162 |
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163 _kernel32.GetFileInformationByHandle.argtypes = [_HANDLE, ctypes.c_void_p] |
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164 _kernel32.GetFileInformationByHandle.restype = _BOOL |
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165 |
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166 _kernel32.CloseHandle.argtypes = [_HANDLE] |
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167 _kernel32.CloseHandle.restype = _BOOL |
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168 |
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169 try: |
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170 _kernel32.CreateHardLinkA.argtypes = [_LPCSTR, _LPCSTR, ctypes.c_void_p] |
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171 _kernel32.CreateHardLinkA.restype = _BOOL |
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172 except AttributeError: |
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173 pass |
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174 |
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175 _kernel32.SetFileAttributesA.argtypes = [_LPCSTR, _DWORD] |
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176 _kernel32.SetFileAttributesA.restype = _BOOL |
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177 |
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178 _kernel32.OpenProcess.argtypes = [_DWORD, _BOOL, _DWORD] |
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179 _kernel32.OpenProcess.restype = _HANDLE |
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180 |
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181 _kernel32.GetExitCodeProcess.argtypes = [_HANDLE, ctypes.c_void_p] |
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182 _kernel32.GetExitCodeProcess.restype = _BOOL |
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183 |
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184 _kernel32.GetLastError.argtypes = [] |
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185 _kernel32.GetLastError.restype = _DWORD |
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186 |
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187 _kernel32.GetModuleFileNameA.argtypes = [_HANDLE, ctypes.c_void_p, _DWORD] |
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188 _kernel32.GetModuleFileNameA.restype = _DWORD |
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189 |
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190 _kernel32.CreateProcessA.argtypes = [_LPCSTR, _LPCSTR, ctypes.c_void_p, |
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191 ctypes.c_void_p, _BOOL, _DWORD, ctypes.c_void_p, _LPCSTR, ctypes.c_void_p, |
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192 ctypes.c_void_p] |
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193 _kernel32.CreateProcessA.restype = _BOOL |
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194 |
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195 _kernel32.ExitProcess.argtypes = [_UINT] |
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196 _kernel32.ExitProcess.restype = None |
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197 |
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198 _kernel32.GetCurrentProcessId.argtypes = [] |
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199 _kernel32.GetCurrentProcessId.restype = _DWORD |
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200 |
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201 _SIGNAL_HANDLER = ctypes.WINFUNCTYPE(_BOOL, _DWORD) |
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202 _kernel32.SetConsoleCtrlHandler.argtypes = [_SIGNAL_HANDLER, _BOOL] |
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203 _kernel32.SetConsoleCtrlHandler.restype = _BOOL |
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204 |
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205 _kernel32.GetStdHandle.argtypes = [_DWORD] |
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206 _kernel32.GetStdHandle.restype = _HANDLE |
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207 |
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208 _kernel32.GetConsoleScreenBufferInfo.argtypes = [_HANDLE, ctypes.c_void_p] |
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209 _kernel32.GetConsoleScreenBufferInfo.restype = _BOOL |
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210 |
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211 _advapi32.GetUserNameA.argtypes = [ctypes.c_void_p, ctypes.c_void_p] |
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212 _advapi32.GetUserNameA.restype = _BOOL |
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213 |
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214 _user32.GetWindowThreadProcessId.argtypes = [_HANDLE, ctypes.c_void_p] |
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215 _user32.GetWindowThreadProcessId.restype = _DWORD |
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216 |
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217 _user32.ShowWindow.argtypes = [_HANDLE, ctypes.c_int] |
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218 _user32.ShowWindow.restype = _BOOL |
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219 |
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220 _WNDENUMPROC = ctypes.WINFUNCTYPE(_BOOL, _HWND, _LPARAM) |
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221 _user32.EnumWindows.argtypes = [_WNDENUMPROC, _LPARAM] |
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222 _user32.EnumWindows.restype = _BOOL |
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223 |
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224 _kernel32.CreateToolhelp32Snapshot.argtypes = [_DWORD, _DWORD] |
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225 _kernel32.CreateToolhelp32Snapshot.restype = _BOOL |
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226 |
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227 _kernel32.PeekNamedPipe.argtypes = [_HANDLE, ctypes.c_void_p, _DWORD, |
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228 ctypes.c_void_p, ctypes.c_void_p, ctypes.c_void_p] |
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229 _kernel32.PeekNamedPipe.restype = _BOOL |
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230 |
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231 _kernel32.Process32First.argtypes = [_HANDLE, ctypes.c_void_p] |
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232 _kernel32.Process32First.restype = _BOOL |
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233 |
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234 _kernel32.Process32Next.argtypes = [_HANDLE, ctypes.c_void_p] |
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235 _kernel32.Process32Next.restype = _BOOL |
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236 |
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237 def _raiseoserror(name): |
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238 err = ctypes.WinError() |
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239 raise OSError(err.errno, '%s: %s' % (name, err.strerror)) |
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240 |
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241 def _getfileinfo(name): |
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242 fh = _kernel32.CreateFileA(name, 0, |
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243 _FILE_SHARE_READ | _FILE_SHARE_WRITE | _FILE_SHARE_DELETE, |
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244 None, _OPEN_EXISTING, _FILE_FLAG_BACKUP_SEMANTICS, None) |
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245 if fh == _INVALID_HANDLE_VALUE: |
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246 _raiseoserror(name) |
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247 try: |
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248 fi = _BY_HANDLE_FILE_INFORMATION() |
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249 if not _kernel32.GetFileInformationByHandle(fh, ctypes.byref(fi)): |
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250 _raiseoserror(name) |
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251 return fi |
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252 finally: |
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253 _kernel32.CloseHandle(fh) |
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254 |
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255 def oslink(src, dst): |
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256 try: |
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257 if not _kernel32.CreateHardLinkA(dst, src, None): |
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258 _raiseoserror(src) |
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259 except AttributeError: # Wine doesn't support this function |
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260 _raiseoserror(src) |
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261 |
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262 def nlinks(name): |
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263 '''return number of hardlinks for the given file''' |
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264 return _getfileinfo(name).nNumberOfLinks |
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265 |
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266 def samefile(path1, path2): |
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267 '''Returns whether path1 and path2 refer to the same file or directory.''' |
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268 res1 = _getfileinfo(path1) |
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269 res2 = _getfileinfo(path2) |
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270 return (res1.dwVolumeSerialNumber == res2.dwVolumeSerialNumber |
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271 and res1.nFileIndexHigh == res2.nFileIndexHigh |
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272 and res1.nFileIndexLow == res2.nFileIndexLow) |
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273 |
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274 def samedevice(path1, path2): |
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275 '''Returns whether path1 and path2 are on the same device.''' |
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276 res1 = _getfileinfo(path1) |
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277 res2 = _getfileinfo(path2) |
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278 return res1.dwVolumeSerialNumber == res2.dwVolumeSerialNumber |
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279 |
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280 def peekpipe(pipe): |
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281 handle = msvcrt.get_osfhandle(pipe.fileno()) |
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282 avail = _DWORD() |
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283 |
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284 if not _kernel32.PeekNamedPipe(handle, None, 0, None, ctypes.byref(avail), |
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285 None): |
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286 err = _kernel32.GetLastError() |
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287 if err == _ERROR_BROKEN_PIPE: |
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288 return 0 |
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289 raise ctypes.WinError(err) |
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290 |
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291 return avail.value |
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292 |
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293 def testpid(pid): |
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294 '''return True if pid is still running or unable to |
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295 determine, False otherwise''' |
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296 h = _kernel32.OpenProcess(_PROCESS_QUERY_INFORMATION, False, pid) |
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297 if h: |
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298 try: |
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299 status = _DWORD() |
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300 if _kernel32.GetExitCodeProcess(h, ctypes.byref(status)): |
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301 return status.value == _STILL_ACTIVE |
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302 finally: |
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303 _kernel32.CloseHandle(h) |
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304 return _kernel32.GetLastError() != _ERROR_INVALID_PARAMETER |
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305 |
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306 def executablepath(): |
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307 '''return full path of hg.exe''' |
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308 size = 600 |
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309 buf = ctypes.create_string_buffer(size + 1) |
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310 len = _kernel32.GetModuleFileNameA(None, ctypes.byref(buf), size) |
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311 if len == 0: |
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312 raise ctypes.WinError() # Note: WinError is a function |
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313 elif len == size: |
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314 raise ctypes.WinError(_ERROR_INSUFFICIENT_BUFFER) |
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315 return buf.value |
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316 |
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317 def getuser(): |
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318 '''return name of current user''' |
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319 size = _DWORD(300) |
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320 buf = ctypes.create_string_buffer(size.value + 1) |
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321 if not _advapi32.GetUserNameA(ctypes.byref(buf), ctypes.byref(size)): |
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322 raise ctypes.WinError() |
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323 return buf.value |
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324 |
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325 _signalhandler = [] |
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326 |
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327 def setsignalhandler(): |
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328 '''Register a termination handler for console events including |
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329 CTRL+C. python signal handlers do not work well with socket |
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330 operations. |
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331 ''' |
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332 def handler(event): |
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333 _kernel32.ExitProcess(1) |
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334 |
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335 if _signalhandler: |
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336 return # already registered |
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337 h = _SIGNAL_HANDLER(handler) |
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338 _signalhandler.append(h) # needed to prevent garbage collection |
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339 if not _kernel32.SetConsoleCtrlHandler(h, True): |
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340 raise ctypes.WinError() |
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341 |
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342 def hidewindow(): |
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343 |
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344 def callback(hwnd, pid): |
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345 wpid = _DWORD() |
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346 _user32.GetWindowThreadProcessId(hwnd, ctypes.byref(wpid)) |
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347 if pid == wpid.value: |
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348 _user32.ShowWindow(hwnd, _SW_HIDE) |
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349 return False # stop enumerating windows |
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350 return True |
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351 |
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352 pid = _kernel32.GetCurrentProcessId() |
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353 _user32.EnumWindows(_WNDENUMPROC(callback), pid) |
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354 |
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355 def termsize(): |
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356 # cmd.exe does not handle CR like a unix console, the CR is |
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357 # counted in the line length. On 80 columns consoles, if 80 |
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358 # characters are written, the following CR won't apply on the |
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359 # current line but on the new one. Keep room for it. |
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360 width = 80 - 1 |
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361 height = 25 |
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362 # Query stderr to avoid problems with redirections |
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363 screenbuf = _kernel32.GetStdHandle( |
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364 _STD_ERROR_HANDLE) # don't close the handle returned |
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365 if screenbuf is None or screenbuf == _INVALID_HANDLE_VALUE: |
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366 return width, height |
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367 csbi = _CONSOLE_SCREEN_BUFFER_INFO() |
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368 if not _kernel32.GetConsoleScreenBufferInfo( |
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369 screenbuf, ctypes.byref(csbi)): |
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370 return width, height |
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371 width = csbi.srWindow.Right - csbi.srWindow.Left # don't '+ 1' |
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372 height = csbi.srWindow.Bottom - csbi.srWindow.Top + 1 |
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373 return width, height |
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374 |
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375 def _1stchild(pid): |
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376 '''return the 1st found child of the given pid |
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377 |
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378 None is returned when no child is found''' |
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379 pe = _tagPROCESSENTRY32() |
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380 |
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381 # create handle to list all processes |
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382 ph = _kernel32.CreateToolhelp32Snapshot(_TH32CS_SNAPPROCESS, 0) |
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383 if ph == _INVALID_HANDLE_VALUE: |
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384 raise ctypes.WinError() |
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385 try: |
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386 r = _kernel32.Process32First(ph, ctypes.byref(pe)) |
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387 # loop over all processes |
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388 while r: |
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389 if pe.th32ParentProcessID == pid: |
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390 # return first child found |
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391 return pe.th32ProcessID |
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392 r = _kernel32.Process32Next(ph, ctypes.byref(pe)) |
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393 finally: |
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394 _kernel32.CloseHandle(ph) |
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395 if _kernel32.GetLastError() != _ERROR_NO_MORE_FILES: |
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396 raise ctypes.WinError() |
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397 return None # no child found |
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398 |
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399 class _tochildpid(int): # pid is _DWORD, which always matches in an int |
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400 '''helper for spawndetached, returns the child pid on conversion to string |
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401 |
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402 Does not resolve the child pid immediately because the child may not yet be |
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403 started. |
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404 ''' |
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405 def childpid(self): |
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406 '''returns the child pid of the first found child of the process |
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407 with this pid''' |
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408 return _1stchild(self) |
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409 def __str__(self): |
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410 # run when the pid is written to the file |
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411 ppid = self.childpid() |
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412 if ppid is None: |
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413 # race, child has exited since check |
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414 # fall back to this pid. Its process will also have disappeared, |
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415 # raising the same error type later as when the child pid would |
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416 # be returned. |
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417 return " %d" % self |
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418 return str(ppid) |
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419 |
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420 def spawndetached(args): |
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421 # No standard library function really spawns a fully detached |
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422 # process under win32 because they allocate pipes or other objects |
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423 # to handle standard streams communications. Passing these objects |
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424 # to the child process requires handle inheritance to be enabled |
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425 # which makes really detached processes impossible. |
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426 si = _STARTUPINFO() |
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427 si.cb = ctypes.sizeof(_STARTUPINFO) |
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428 |
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429 pi = _PROCESS_INFORMATION() |
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430 |
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431 env = '' |
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432 for k in encoding.environ: |
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433 env += "%s=%s\0" % (k, encoding.environ[k]) |
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434 if not env: |
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435 env = '\0' |
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436 env += '\0' |
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437 |
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438 args = subprocess.list2cmdline(args) |
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439 # Not running the command in shell mode makes Python 2.6 hang when |
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440 # writing to hgweb output socket. |
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441 comspec = encoding.environ.get("COMSPEC", "cmd.exe") |
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442 args = comspec + " /c " + args |
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443 |
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444 res = _kernel32.CreateProcessA( |
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445 None, args, None, None, False, _CREATE_NO_WINDOW, |
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446 env, pycompat.getcwd(), ctypes.byref(si), ctypes.byref(pi)) |
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447 if not res: |
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448 raise ctypes.WinError() |
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449 |
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450 # _tochildpid because the process is the child of COMSPEC |
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451 return _tochildpid(pi.dwProcessId) |
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452 |
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453 def unlink(f): |
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454 '''try to implement POSIX' unlink semantics on Windows''' |
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455 |
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456 if os.path.isdir(f): |
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457 # use EPERM because it is POSIX prescribed value, even though |
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458 # unlink(2) on directories returns EISDIR on Linux |
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459 raise IOError(errno.EPERM, |
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460 "Unlinking directory not permitted: '%s'" % f) |
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461 |
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462 # POSIX allows to unlink and rename open files. Windows has serious |
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463 # problems with doing that: |
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464 # - Calling os.unlink (or os.rename) on a file f fails if f or any |
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465 # hardlinked copy of f has been opened with Python's open(). There is no |
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466 # way such a file can be deleted or renamed on Windows (other than |
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467 # scheduling the delete or rename for the next reboot). |
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468 # - Calling os.unlink on a file that has been opened with Mercurial's |
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469 # posixfile (or comparable methods) will delay the actual deletion of |
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470 # the file for as long as the file is held open. The filename is blocked |
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471 # during that time and cannot be used for recreating a new file under |
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472 # that same name ("zombie file"). Directories containing such zombie files |
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473 # cannot be removed or moved. |
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474 # A file that has been opened with posixfile can be renamed, so we rename |
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475 # f to a random temporary name before calling os.unlink on it. This allows |
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476 # callers to recreate f immediately while having other readers do their |
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477 # implicit zombie filename blocking on a temporary name. |
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478 |
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479 for tries in xrange(10): |
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480 temp = '%s-%08x' % (f, random.randint(0, 0xffffffff)) |
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481 try: |
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482 os.rename(f, temp) # raises OSError EEXIST if temp exists |
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483 break |
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484 except OSError as e: |
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485 if e.errno != errno.EEXIST: |
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486 raise |
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487 else: |
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488 raise IOError(errno.EEXIST, "No usable temporary filename found") |
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489 |
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490 try: |
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491 os.unlink(temp) |
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492 except OSError: |
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493 # The unlink might have failed because the READONLY attribute may heave |
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494 # been set on the original file. Rename works fine with READONLY set, |
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495 # but not os.unlink. Reset all attributes and try again. |
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496 _kernel32.SetFileAttributesA(temp, _FILE_ATTRIBUTE_NORMAL) |
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497 try: |
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498 os.unlink(temp) |
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499 except OSError: |
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500 # The unlink might have failed due to some very rude AV-Scanners. |
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501 # Leaking a tempfile is the lesser evil than aborting here and |
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502 # leaving some potentially serious inconsistencies. |
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503 pass |
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504 |
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505 def makedir(path, notindexed): |
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506 os.mkdir(path) |
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507 if notindexed: |
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508 _kernel32.SetFileAttributesA(path, _FILE_ATTRIBUTE_NOT_CONTENT_INDEXED) |