Mercurial > hg
annotate mercurial/win32.py @ 18435:8c019d2fd7c0
store: switch to C-based hashed path encoding
author | Bryan O'Sullivan <bryano@fb.com> |
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date | Wed, 12 Dec 2012 13:09:37 -0800 |
parents | fd3f8b87b682 |
children | 2f6418d8a4c9 |
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 import ctypes, errno, os, subprocess, random |
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9 |
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10 _kernel32 = ctypes.windll.kernel32 |
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11 _advapi32 = ctypes.windll.advapi32 |
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12 _user32 = ctypes.windll.user32 |
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13 |
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14 _BOOL = ctypes.c_long |
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15 _WORD = ctypes.c_ushort |
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16 _DWORD = ctypes.c_ulong |
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17 _UINT = ctypes.c_uint |
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18 _LONG = ctypes.c_long |
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19 _LPCSTR = _LPSTR = ctypes.c_char_p |
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20 _HANDLE = ctypes.c_void_p |
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21 _HWND = _HANDLE |
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22 |
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23 _INVALID_HANDLE_VALUE = _HANDLE(-1).value |
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24 |
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25 # GetLastError |
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26 _ERROR_SUCCESS = 0 |
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27 _ERROR_INVALID_PARAMETER = 87 |
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28 _ERROR_INSUFFICIENT_BUFFER = 122 |
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29 |
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30 # WPARAM is defined as UINT_PTR (unsigned type) |
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31 # LPARAM is defined as LONG_PTR (signed type) |
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32 if ctypes.sizeof(ctypes.c_long) == ctypes.sizeof(ctypes.c_void_p): |
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33 _WPARAM = ctypes.c_ulong |
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34 _LPARAM = ctypes.c_long |
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35 elif ctypes.sizeof(ctypes.c_longlong) == ctypes.sizeof(ctypes.c_void_p): |
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36 _WPARAM = ctypes.c_ulonglong |
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37 _LPARAM = ctypes.c_longlong |
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38 |
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39 class _FILETIME(ctypes.Structure): |
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40 _fields_ = [('dwLowDateTime', _DWORD), |
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41 ('dwHighDateTime', _DWORD)] |
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42 |
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43 class _BY_HANDLE_FILE_INFORMATION(ctypes.Structure): |
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44 _fields_ = [('dwFileAttributes', _DWORD), |
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45 ('ftCreationTime', _FILETIME), |
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46 ('ftLastAccessTime', _FILETIME), |
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47 ('ftLastWriteTime', _FILETIME), |
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48 ('dwVolumeSerialNumber', _DWORD), |
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49 ('nFileSizeHigh', _DWORD), |
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50 ('nFileSizeLow', _DWORD), |
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51 ('nNumberOfLinks', _DWORD), |
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52 ('nFileIndexHigh', _DWORD), |
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53 ('nFileIndexLow', _DWORD)] |
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54 |
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55 # CreateFile |
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56 _FILE_SHARE_READ = 0x00000001 |
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57 _FILE_SHARE_WRITE = 0x00000002 |
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58 _FILE_SHARE_DELETE = 0x00000004 |
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59 |
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60 _OPEN_EXISTING = 3 |
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61 |
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62 _FILE_FLAG_BACKUP_SEMANTICS = 0x02000000 |
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63 |
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64 # SetFileAttributes |
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65 _FILE_ATTRIBUTE_NORMAL = 0x80 |
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66 _FILE_ATTRIBUTE_NOT_CONTENT_INDEXED = 0x2000 |
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67 |
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68 # Process Security and Access Rights |
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69 _PROCESS_QUERY_INFORMATION = 0x0400 |
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70 |
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71 # GetExitCodeProcess |
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72 _STILL_ACTIVE = 259 |
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73 |
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74 class _STARTUPINFO(ctypes.Structure): |
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75 _fields_ = [('cb', _DWORD), |
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76 ('lpReserved', _LPSTR), |
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77 ('lpDesktop', _LPSTR), |
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78 ('lpTitle', _LPSTR), |
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79 ('dwX', _DWORD), |
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80 ('dwY', _DWORD), |
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81 ('dwXSize', _DWORD), |
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82 ('dwYSize', _DWORD), |
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83 ('dwXCountChars', _DWORD), |
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84 ('dwYCountChars', _DWORD), |
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85 ('dwFillAttribute', _DWORD), |
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86 ('dwFlags', _DWORD), |
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87 ('wShowWindow', _WORD), |
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88 ('cbReserved2', _WORD), |
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89 ('lpReserved2', ctypes.c_char_p), |
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90 ('hStdInput', _HANDLE), |
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91 ('hStdOutput', _HANDLE), |
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92 ('hStdError', _HANDLE)] |
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93 |
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94 class _PROCESS_INFORMATION(ctypes.Structure): |
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95 _fields_ = [('hProcess', _HANDLE), |
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96 ('hThread', _HANDLE), |
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97 ('dwProcessId', _DWORD), |
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98 ('dwThreadId', _DWORD)] |
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99 |
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100 _CREATE_NO_WINDOW = 0x08000000 |
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101 _SW_HIDE = 0 |
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102 |
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103 class _COORD(ctypes.Structure): |
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104 _fields_ = [('X', ctypes.c_short), |
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105 ('Y', ctypes.c_short)] |
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106 |
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107 class _SMALL_RECT(ctypes.Structure): |
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108 _fields_ = [('Left', ctypes.c_short), |
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109 ('Top', ctypes.c_short), |
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110 ('Right', ctypes.c_short), |
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111 ('Bottom', ctypes.c_short)] |
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112 |
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113 class _CONSOLE_SCREEN_BUFFER_INFO(ctypes.Structure): |
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114 _fields_ = [('dwSize', _COORD), |
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115 ('dwCursorPosition', _COORD), |
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116 ('wAttributes', _WORD), |
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117 ('srWindow', _SMALL_RECT), |
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118 ('dwMaximumWindowSize', _COORD)] |
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119 |
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120 _STD_ERROR_HANDLE = _DWORD(-12).value |
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121 |
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122 # types of parameters of C functions used (required by pypy) |
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123 |
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124 _kernel32.CreateFileA.argtypes = [_LPCSTR, _DWORD, _DWORD, ctypes.c_void_p, |
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125 _DWORD, _DWORD, _HANDLE] |
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126 _kernel32.CreateFileA.restype = _HANDLE |
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127 |
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128 _kernel32.GetFileInformationByHandle.argtypes = [_HANDLE, ctypes.c_void_p] |
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129 _kernel32.GetFileInformationByHandle.restype = _BOOL |
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130 |
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131 _kernel32.CloseHandle.argtypes = [_HANDLE] |
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132 _kernel32.CloseHandle.restype = _BOOL |
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133 |
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134 try: |
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135 _kernel32.CreateHardLinkA.argtypes = [_LPCSTR, _LPCSTR, ctypes.c_void_p] |
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136 _kernel32.CreateHardLinkA.restype = _BOOL |
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137 except AttributeError: |
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138 pass |
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139 |
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140 _kernel32.SetFileAttributesA.argtypes = [_LPCSTR, _DWORD] |
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141 _kernel32.SetFileAttributesA.restype = _BOOL |
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142 |
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143 _kernel32.OpenProcess.argtypes = [_DWORD, _BOOL, _DWORD] |
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144 _kernel32.OpenProcess.restype = _HANDLE |
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145 |
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146 _kernel32.GetExitCodeProcess.argtypes = [_HANDLE, ctypes.c_void_p] |
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147 _kernel32.GetExitCodeProcess.restype = _BOOL |
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148 |
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149 _kernel32.GetLastError.argtypes = [] |
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150 _kernel32.GetLastError.restype = _DWORD |
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151 |
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152 _kernel32.GetModuleFileNameA.argtypes = [_HANDLE, ctypes.c_void_p, _DWORD] |
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153 _kernel32.GetModuleFileNameA.restype = _DWORD |
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154 |
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155 _kernel32.CreateProcessA.argtypes = [_LPCSTR, _LPCSTR, ctypes.c_void_p, |
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156 ctypes.c_void_p, _BOOL, _DWORD, ctypes.c_void_p, _LPCSTR, ctypes.c_void_p, |
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157 ctypes.c_void_p] |
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158 _kernel32.CreateProcessA.restype = _BOOL |
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159 |
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160 _kernel32.ExitProcess.argtypes = [_UINT] |
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161 _kernel32.ExitProcess.restype = None |
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162 |
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163 _kernel32.GetCurrentProcessId.argtypes = [] |
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164 _kernel32.GetCurrentProcessId.restype = _DWORD |
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165 |
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166 _SIGNAL_HANDLER = ctypes.WINFUNCTYPE(_BOOL, _DWORD) |
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167 _kernel32.SetConsoleCtrlHandler.argtypes = [_SIGNAL_HANDLER, _BOOL] |
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168 _kernel32.SetConsoleCtrlHandler.restype = _BOOL |
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169 |
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170 _kernel32.GetStdHandle.argtypes = [_DWORD] |
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171 _kernel32.GetStdHandle.restype = _HANDLE |
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172 |
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173 _kernel32.GetConsoleScreenBufferInfo.argtypes = [_HANDLE, ctypes.c_void_p] |
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174 _kernel32.GetConsoleScreenBufferInfo.restype = _BOOL |
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175 |
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176 _advapi32.GetUserNameA.argtypes = [ctypes.c_void_p, ctypes.c_void_p] |
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177 _advapi32.GetUserNameA.restype = _BOOL |
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178 |
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179 _user32.GetWindowThreadProcessId.argtypes = [_HANDLE, ctypes.c_void_p] |
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180 _user32.GetWindowThreadProcessId.restype = _DWORD |
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181 |
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182 _user32.ShowWindow.argtypes = [_HANDLE, ctypes.c_int] |
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183 _user32.ShowWindow.restype = _BOOL |
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184 |
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185 _WNDENUMPROC = ctypes.WINFUNCTYPE(_BOOL, _HWND, _LPARAM) |
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186 _user32.EnumWindows.argtypes = [_WNDENUMPROC, _LPARAM] |
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187 _user32.EnumWindows.restype = _BOOL |
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188 |
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189 def _raiseoserror(name): |
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190 err = ctypes.WinError() |
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191 raise OSError(err.errno, '%s: %s' % (name, err.strerror)) |
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192 |
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193 def _getfileinfo(name): |
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194 fh = _kernel32.CreateFileA(name, 0, |
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195 _FILE_SHARE_READ | _FILE_SHARE_WRITE | _FILE_SHARE_DELETE, |
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196 None, _OPEN_EXISTING, _FILE_FLAG_BACKUP_SEMANTICS, None) |
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197 if fh == _INVALID_HANDLE_VALUE: |
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198 _raiseoserror(name) |
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199 try: |
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200 fi = _BY_HANDLE_FILE_INFORMATION() |
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201 if not _kernel32.GetFileInformationByHandle(fh, ctypes.byref(fi)): |
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202 _raiseoserror(name) |
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203 return fi |
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204 finally: |
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205 _kernel32.CloseHandle(fh) |
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206 |
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207 def oslink(src, dst): |
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208 try: |
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209 if not _kernel32.CreateHardLinkA(dst, src, None): |
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210 _raiseoserror(src) |
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211 except AttributeError: # Wine doesn't support this function |
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212 _raiseoserror(src) |
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213 |
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214 def nlinks(name): |
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215 '''return number of hardlinks for the given file''' |
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216 return _getfileinfo(name).nNumberOfLinks |
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217 |
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218 def samefile(path1, path2): |
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219 '''Returns whether path1 and path2 refer to the same file or directory.''' |
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220 res1 = _getfileinfo(path1) |
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221 res2 = _getfileinfo(path2) |
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222 return (res1.dwVolumeSerialNumber == res2.dwVolumeSerialNumber |
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223 and res1.nFileIndexHigh == res2.nFileIndexHigh |
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224 and res1.nFileIndexLow == res2.nFileIndexLow) |
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225 |
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226 def samedevice(path1, path2): |
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227 '''Returns whether path1 and path2 are on the same device.''' |
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228 res1 = _getfileinfo(path1) |
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229 res2 = _getfileinfo(path2) |
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230 return res1.dwVolumeSerialNumber == res2.dwVolumeSerialNumber |
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231 |
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232 def testpid(pid): |
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233 '''return True if pid is still running or unable to |
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234 determine, False otherwise''' |
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235 h = _kernel32.OpenProcess(_PROCESS_QUERY_INFORMATION, False, pid) |
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236 if h: |
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237 try: |
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238 status = _DWORD() |
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239 if _kernel32.GetExitCodeProcess(h, ctypes.byref(status)): |
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240 return status.value == _STILL_ACTIVE |
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241 finally: |
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242 _kernel32.CloseHandle(h) |
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243 return _kernel32.GetLastError() != _ERROR_INVALID_PARAMETER |
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244 |
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245 def executablepath(): |
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246 '''return full path of hg.exe''' |
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247 size = 600 |
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248 buf = ctypes.create_string_buffer(size + 1) |
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249 len = _kernel32.GetModuleFileNameA(None, ctypes.byref(buf), size) |
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250 if len == 0: |
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251 raise ctypes.WinError |
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252 elif len == size: |
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253 raise ctypes.WinError(_ERROR_INSUFFICIENT_BUFFER) |
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254 return buf.value |
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255 |
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256 def getuser(): |
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257 '''return name of current user''' |
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258 size = _DWORD(300) |
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259 buf = ctypes.create_string_buffer(size.value + 1) |
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260 if not _advapi32.GetUserNameA(ctypes.byref(buf), ctypes.byref(size)): |
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261 raise ctypes.WinError |
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262 return buf.value |
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263 |
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264 _signalhandler = [] |
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265 |
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266 def setsignalhandler(): |
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267 '''Register a termination handler for console events including |
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268 CTRL+C. python signal handlers do not work well with socket |
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269 operations. |
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270 ''' |
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271 def handler(event): |
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272 _kernel32.ExitProcess(1) |
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273 |
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274 if _signalhandler: |
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275 return # already registered |
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276 h = _SIGNAL_HANDLER(handler) |
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277 _signalhandler.append(h) # needed to prevent garbage collection |
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278 if not _kernel32.SetConsoleCtrlHandler(h, True): |
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279 raise ctypes.WinError |
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280 |
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281 def hidewindow(): |
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282 |
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283 def callback(hwnd, pid): |
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284 wpid = _DWORD() |
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285 _user32.GetWindowThreadProcessId(hwnd, ctypes.byref(wpid)) |
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286 if pid == wpid.value: |
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287 _user32.ShowWindow(hwnd, _SW_HIDE) |
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288 return False # stop enumerating windows |
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289 return True |
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290 |
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291 pid = _kernel32.GetCurrentProcessId() |
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292 _user32.EnumWindows(_WNDENUMPROC(callback), pid) |
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293 |
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termwidth: move to ui.ui from util
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294 def termwidth(): |
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295 # cmd.exe does not handle CR like a unix console, the CR is |
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296 # counted in the line length. On 80 columns consoles, if 80 |
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297 # characters are written, the following CR won't apply on the |
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298 # current line but on the new one. Keep room for it. |
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299 width = 79 |
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300 # Query stderr to avoid problems with redirections |
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301 screenbuf = _kernel32.GetStdHandle( |
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302 _STD_ERROR_HANDLE) # don't close the handle returned |
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303 if screenbuf is None or screenbuf == _INVALID_HANDLE_VALUE: |
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304 return width |
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305 csbi = _CONSOLE_SCREEN_BUFFER_INFO() |
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306 if not _kernel32.GetConsoleScreenBufferInfo( |
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307 screenbuf, ctypes.byref(csbi)): |
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308 return width |
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309 width = csbi.srWindow.Right - csbi.srWindow.Left |
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310 return width |
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311 |
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312 def spawndetached(args): |
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313 # No standard library function really spawns a fully detached |
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314 # process under win32 because they allocate pipes or other objects |
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315 # to handle standard streams communications. Passing these objects |
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316 # to the child process requires handle inheritance to be enabled |
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317 # which makes really detached processes impossible. |
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318 si = _STARTUPINFO() |
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319 si.cb = ctypes.sizeof(_STARTUPINFO) |
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320 |
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321 pi = _PROCESS_INFORMATION() |
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322 |
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323 env = '' |
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324 for k in os.environ: |
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325 env += "%s=%s\0" % (k, os.environ[k]) |
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326 if not env: |
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327 env = '\0' |
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328 env += '\0' |
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329 |
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330 args = subprocess.list2cmdline(args) |
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331 # Not running the command in shell mode makes Python 2.6 hang when |
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332 # writing to hgweb output socket. |
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333 comspec = os.environ.get("COMSPEC", "cmd.exe") |
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334 args = comspec + " /c " + args |
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335 |
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336 res = _kernel32.CreateProcessA( |
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337 None, args, None, None, False, _CREATE_NO_WINDOW, |
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338 env, os.getcwd(), ctypes.byref(si), ctypes.byref(pi)) |
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339 if not res: |
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340 raise ctypes.WinError |
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341 |
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342 return pi.dwProcessId |
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343 |
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344 def unlink(f): |
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345 '''try to implement POSIX' unlink semantics on Windows''' |
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346 |
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347 # POSIX allows to unlink and rename open files. Windows has serious |
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348 # problems with doing that: |
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349 # - Calling os.unlink (or os.rename) on a file f fails if f or any |
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350 # hardlinked copy of f has been opened with Python's open(). There is no |
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351 # way such a file can be deleted or renamed on Windows (other than |
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352 # scheduling the delete or rename for the next reboot). |
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353 # - Calling os.unlink on a file that has been opened with Mercurial's |
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354 # posixfile (or comparable methods) will delay the actual deletion of |
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355 # the file for as long as the file is held open. The filename is blocked |
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356 # during that time and cannot be used for recreating a new file under |
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357 # that same name ("zombie file"). Directories containing such zombie files |
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358 # cannot be removed or moved. |
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359 # A file that has been opened with posixfile can be renamed, so we rename |
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360 # f to a random temporary name before calling os.unlink on it. This allows |
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361 # callers to recreate f immediately while having other readers do their |
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362 # implicit zombie filename blocking on a temporary name. |
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363 |
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364 for tries in xrange(10): |
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365 temp = '%s-%08x' % (f, random.randint(0, 0xffffffff)) |
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366 try: |
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367 os.rename(f, temp) # raises OSError EEXIST if temp exists |
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368 break |
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369 except OSError, e: |
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370 if e.errno != errno.EEXIST: |
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371 raise |
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372 else: |
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373 raise IOError(errno.EEXIST, "No usable temporary filename found") |
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374 |
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375 try: |
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376 os.unlink(temp) |
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377 except OSError: |
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378 # The unlink might have failed because the READONLY attribute may heave |
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379 # been set on the original file. Rename works fine with READONLY set, |
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380 # but not os.unlink. Reset all attributes and try again. |
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381 _kernel32.SetFileAttributesA(temp, _FILE_ATTRIBUTE_NORMAL) |
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382 try: |
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383 os.unlink(temp) |
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384 except OSError: |
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385 # The unlink might have failed due to some very rude AV-Scanners. |
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386 # Leaking a tempfile is the lesser evil than aborting here and |
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387 # leaving some potentially serious inconsistencies. |
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388 pass |
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389 |
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390 def makedir(path, notindexed): |
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391 os.mkdir(path) |
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392 if notindexed: |
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393 _kernel32.SetFileAttributesA(path, _FILE_ATTRIBUTE_NOT_CONTENT_INDEXED) |