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1 | 1 | # win32.py - utility functions that use win32 API |
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2 | 2 | # |
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3 | 3 | # Copyright 2005-2009 Matt Mackall <mpm@selenic.com> and others |
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4 | 4 | # |
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5 | 5 | # This software may be used and distributed according to the terms of the |
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6 | 6 | # GNU General Public License version 2 or any later version. |
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7 | 7 | |
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8 | 8 | import ctypes, errno, os, subprocess, random |
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9 | 9 | |
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10 | 10 | _kernel32 = ctypes.windll.kernel32 |
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11 | 11 | _advapi32 = ctypes.windll.advapi32 |
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12 | 12 | _user32 = ctypes.windll.user32 |
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13 | 13 | |
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14 | 14 | _BOOL = ctypes.c_long |
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15 | 15 | _WORD = ctypes.c_ushort |
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16 | 16 | _DWORD = ctypes.c_ulong |
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17 | 17 | _UINT = ctypes.c_uint |
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18 | 18 | _LONG = ctypes.c_long |
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19 | 19 | _LPCSTR = _LPSTR = ctypes.c_char_p |
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20 | 20 | _HANDLE = ctypes.c_void_p |
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21 | 21 | _HWND = _HANDLE |
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22 | 22 | |
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23 | 23 | _INVALID_HANDLE_VALUE = _HANDLE(-1).value |
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24 | 24 | |
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25 | 25 | # GetLastError |
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26 | 26 | _ERROR_SUCCESS = 0 |
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27 | 27 | _ERROR_INVALID_PARAMETER = 87 |
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28 | 28 | _ERROR_INSUFFICIENT_BUFFER = 122 |
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29 | 29 | |
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30 | 30 | # WPARAM is defined as UINT_PTR (unsigned type) |
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31 | 31 | # LPARAM is defined as LONG_PTR (signed type) |
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32 | 32 | if ctypes.sizeof(ctypes.c_long) == ctypes.sizeof(ctypes.c_void_p): |
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33 | 33 | _WPARAM = ctypes.c_ulong |
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34 | 34 | _LPARAM = ctypes.c_long |
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35 | 35 | elif ctypes.sizeof(ctypes.c_longlong) == ctypes.sizeof(ctypes.c_void_p): |
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36 | 36 | _WPARAM = ctypes.c_ulonglong |
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37 | 37 | _LPARAM = ctypes.c_longlong |
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38 | 38 | |
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39 | 39 | class _FILETIME(ctypes.Structure): |
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40 | 40 | _fields_ = [('dwLowDateTime', _DWORD), |
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41 | 41 | ('dwHighDateTime', _DWORD)] |
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42 | 42 | |
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43 | 43 | class _BY_HANDLE_FILE_INFORMATION(ctypes.Structure): |
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44 | 44 | _fields_ = [('dwFileAttributes', _DWORD), |
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45 | 45 | ('ftCreationTime', _FILETIME), |
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46 | 46 | ('ftLastAccessTime', _FILETIME), |
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47 | 47 | ('ftLastWriteTime', _FILETIME), |
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48 | 48 | ('dwVolumeSerialNumber', _DWORD), |
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49 | 49 | ('nFileSizeHigh', _DWORD), |
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50 | 50 | ('nFileSizeLow', _DWORD), |
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51 | 51 | ('nNumberOfLinks', _DWORD), |
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52 | 52 | ('nFileIndexHigh', _DWORD), |
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53 | 53 | ('nFileIndexLow', _DWORD)] |
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54 | 54 | |
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55 | 55 | # CreateFile |
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56 | 56 | _FILE_SHARE_READ = 0x00000001 |
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57 | 57 | _FILE_SHARE_WRITE = 0x00000002 |
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58 | 58 | _FILE_SHARE_DELETE = 0x00000004 |
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59 | 59 | |
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60 | 60 | _OPEN_EXISTING = 3 |
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61 | 61 | |
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62 | 62 | _FILE_FLAG_BACKUP_SEMANTICS = 0x02000000 |
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63 | 63 | |
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64 | 64 | # SetFileAttributes |
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65 | 65 | _FILE_ATTRIBUTE_NORMAL = 0x80 |
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66 | 66 | _FILE_ATTRIBUTE_NOT_CONTENT_INDEXED = 0x2000 |
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67 | 67 | |
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68 | 68 | # Process Security and Access Rights |
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69 | 69 | _PROCESS_QUERY_INFORMATION = 0x0400 |
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70 | 70 | |
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71 | 71 | # GetExitCodeProcess |
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72 | 72 | _STILL_ACTIVE = 259 |
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73 | 73 | |
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74 | 74 | class _STARTUPINFO(ctypes.Structure): |
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75 | 75 | _fields_ = [('cb', _DWORD), |
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76 | 76 | ('lpReserved', _LPSTR), |
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77 | 77 | ('lpDesktop', _LPSTR), |
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78 | 78 | ('lpTitle', _LPSTR), |
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79 | 79 | ('dwX', _DWORD), |
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80 | 80 | ('dwY', _DWORD), |
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81 | 81 | ('dwXSize', _DWORD), |
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82 | 82 | ('dwYSize', _DWORD), |
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83 | 83 | ('dwXCountChars', _DWORD), |
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84 | 84 | ('dwYCountChars', _DWORD), |
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85 | 85 | ('dwFillAttribute', _DWORD), |
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86 | 86 | ('dwFlags', _DWORD), |
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87 | 87 | ('wShowWindow', _WORD), |
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88 | 88 | ('cbReserved2', _WORD), |
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89 | 89 | ('lpReserved2', ctypes.c_char_p), |
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90 | 90 | ('hStdInput', _HANDLE), |
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91 | 91 | ('hStdOutput', _HANDLE), |
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92 | 92 | ('hStdError', _HANDLE)] |
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93 | 93 | |
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94 | 94 | class _PROCESS_INFORMATION(ctypes.Structure): |
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95 | 95 | _fields_ = [('hProcess', _HANDLE), |
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96 | 96 | ('hThread', _HANDLE), |
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97 | 97 | ('dwProcessId', _DWORD), |
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98 | 98 | ('dwThreadId', _DWORD)] |
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99 | 99 | |
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100 | 100 | _CREATE_NO_WINDOW = 0x08000000 |
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101 | 101 | _SW_HIDE = 0 |
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102 | 102 | |
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103 | 103 | class _COORD(ctypes.Structure): |
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104 | 104 | _fields_ = [('X', ctypes.c_short), |
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105 | 105 | ('Y', ctypes.c_short)] |
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106 | 106 | |
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107 | 107 | class _SMALL_RECT(ctypes.Structure): |
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108 | 108 | _fields_ = [('Left', ctypes.c_short), |
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109 | 109 | ('Top', ctypes.c_short), |
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110 | 110 | ('Right', ctypes.c_short), |
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111 | 111 | ('Bottom', ctypes.c_short)] |
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112 | 112 | |
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113 | 113 | class _CONSOLE_SCREEN_BUFFER_INFO(ctypes.Structure): |
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114 | 114 | _fields_ = [('dwSize', _COORD), |
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115 | 115 | ('dwCursorPosition', _COORD), |
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116 | 116 | ('wAttributes', _WORD), |
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117 | 117 | ('srWindow', _SMALL_RECT), |
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118 | 118 | ('dwMaximumWindowSize', _COORD)] |
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119 | 119 | |
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120 | 120 | _STD_ERROR_HANDLE = _DWORD(-12).value |
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121 | 121 | |
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122 | # CreateToolhelp32Snapshot, Process32First, Process32Next | |
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123 | _TH32CS_SNAPPROCESS = 0x00000002 | |
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124 | _MAX_PATH = 260 | |
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125 | ||
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126 | class _tagPROCESSENTRY32(ctypes.Structure): | |
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127 | _fields_ = [('dwsize', _DWORD), | |
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128 | ('cntUsage', _DWORD), | |
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129 | ('th32ProcessID', _DWORD), | |
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130 | ('th32DefaultHeapID', ctypes.c_void_p), | |
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131 | ('th32ModuleID', _DWORD), | |
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132 | ('cntThreads', _DWORD), | |
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133 | ('th32ParentProcessID', _DWORD), | |
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134 | ('pcPriClassBase', _LONG), | |
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135 | ('dwFlags', _DWORD), | |
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136 | ('szExeFile', ctypes.c_char * _MAX_PATH)] | |
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137 | ||
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138 | def __init__(self): | |
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139 | super(_tagPROCESSENTRY32, self).__init__() | |
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140 | self.dwsize = ctypes.sizeof(self) | |
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141 | ||
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142 | ||
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122 | 143 | # types of parameters of C functions used (required by pypy) |
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123 | 144 | |
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124 | 145 | _kernel32.CreateFileA.argtypes = [_LPCSTR, _DWORD, _DWORD, ctypes.c_void_p, |
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125 | 146 | _DWORD, _DWORD, _HANDLE] |
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126 | 147 | _kernel32.CreateFileA.restype = _HANDLE |
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127 | 148 | |
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128 | 149 | _kernel32.GetFileInformationByHandle.argtypes = [_HANDLE, ctypes.c_void_p] |
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129 | 150 | _kernel32.GetFileInformationByHandle.restype = _BOOL |
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130 | 151 | |
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131 | 152 | _kernel32.CloseHandle.argtypes = [_HANDLE] |
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132 | 153 | _kernel32.CloseHandle.restype = _BOOL |
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133 | 154 | |
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134 | 155 | try: |
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135 | 156 | _kernel32.CreateHardLinkA.argtypes = [_LPCSTR, _LPCSTR, ctypes.c_void_p] |
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136 | 157 | _kernel32.CreateHardLinkA.restype = _BOOL |
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137 | 158 | except AttributeError: |
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138 | 159 | pass |
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139 | 160 | |
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140 | 161 | _kernel32.SetFileAttributesA.argtypes = [_LPCSTR, _DWORD] |
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141 | 162 | _kernel32.SetFileAttributesA.restype = _BOOL |
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142 | 163 | |
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143 | 164 | _kernel32.OpenProcess.argtypes = [_DWORD, _BOOL, _DWORD] |
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144 | 165 | _kernel32.OpenProcess.restype = _HANDLE |
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145 | 166 | |
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146 | 167 | _kernel32.GetExitCodeProcess.argtypes = [_HANDLE, ctypes.c_void_p] |
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147 | 168 | _kernel32.GetExitCodeProcess.restype = _BOOL |
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148 | 169 | |
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149 | 170 | _kernel32.GetLastError.argtypes = [] |
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150 | 171 | _kernel32.GetLastError.restype = _DWORD |
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151 | 172 | |
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152 | 173 | _kernel32.GetModuleFileNameA.argtypes = [_HANDLE, ctypes.c_void_p, _DWORD] |
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153 | 174 | _kernel32.GetModuleFileNameA.restype = _DWORD |
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154 | 175 | |
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155 | 176 | _kernel32.CreateProcessA.argtypes = [_LPCSTR, _LPCSTR, ctypes.c_void_p, |
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156 | 177 | ctypes.c_void_p, _BOOL, _DWORD, ctypes.c_void_p, _LPCSTR, ctypes.c_void_p, |
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157 | 178 | ctypes.c_void_p] |
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158 | 179 | _kernel32.CreateProcessA.restype = _BOOL |
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159 | 180 | |
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160 | 181 | _kernel32.ExitProcess.argtypes = [_UINT] |
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161 | 182 | _kernel32.ExitProcess.restype = None |
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162 | 183 | |
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163 | 184 | _kernel32.GetCurrentProcessId.argtypes = [] |
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164 | 185 | _kernel32.GetCurrentProcessId.restype = _DWORD |
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165 | 186 | |
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166 | 187 | _SIGNAL_HANDLER = ctypes.WINFUNCTYPE(_BOOL, _DWORD) |
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167 | 188 | _kernel32.SetConsoleCtrlHandler.argtypes = [_SIGNAL_HANDLER, _BOOL] |
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168 | 189 | _kernel32.SetConsoleCtrlHandler.restype = _BOOL |
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169 | 190 | |
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170 | 191 | _kernel32.GetStdHandle.argtypes = [_DWORD] |
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171 | 192 | _kernel32.GetStdHandle.restype = _HANDLE |
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172 | 193 | |
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173 | 194 | _kernel32.GetConsoleScreenBufferInfo.argtypes = [_HANDLE, ctypes.c_void_p] |
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174 | 195 | _kernel32.GetConsoleScreenBufferInfo.restype = _BOOL |
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175 | 196 | |
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176 | 197 | _advapi32.GetUserNameA.argtypes = [ctypes.c_void_p, ctypes.c_void_p] |
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177 | 198 | _advapi32.GetUserNameA.restype = _BOOL |
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178 | 199 | |
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179 | 200 | _user32.GetWindowThreadProcessId.argtypes = [_HANDLE, ctypes.c_void_p] |
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180 | 201 | _user32.GetWindowThreadProcessId.restype = _DWORD |
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181 | 202 | |
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182 | 203 | _user32.ShowWindow.argtypes = [_HANDLE, ctypes.c_int] |
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183 | 204 | _user32.ShowWindow.restype = _BOOL |
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184 | 205 | |
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185 | 206 | _WNDENUMPROC = ctypes.WINFUNCTYPE(_BOOL, _HWND, _LPARAM) |
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186 | 207 | _user32.EnumWindows.argtypes = [_WNDENUMPROC, _LPARAM] |
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187 | 208 | _user32.EnumWindows.restype = _BOOL |
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188 | 209 | |
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210 | _kernel32.CreateToolhelp32Snapshot.argtypes = [_DWORD, _DWORD] | |
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211 | _kernel32.CreateToolhelp32Snapshot.restype = _BOOL | |
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212 | ||
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213 | _kernel32.Process32First.argtypes = [_HANDLE, ctypes.c_void_p] | |
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214 | _kernel32.Process32First.restype = _BOOL | |
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215 | ||
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216 | _kernel32.Process32Next.argtypes = [_HANDLE, ctypes.c_void_p] | |
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217 | _kernel32.Process32Next.restype = _BOOL | |
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218 | ||
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189 | 219 | def _raiseoserror(name): |
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190 | 220 | err = ctypes.WinError() |
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191 | 221 | raise OSError(err.errno, '%s: %s' % (name, err.strerror)) |
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192 | 222 | |
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193 | 223 | def _getfileinfo(name): |
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194 | 224 | fh = _kernel32.CreateFileA(name, 0, |
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195 | 225 | _FILE_SHARE_READ | _FILE_SHARE_WRITE | _FILE_SHARE_DELETE, |
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196 | 226 | None, _OPEN_EXISTING, _FILE_FLAG_BACKUP_SEMANTICS, None) |
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197 | 227 | if fh == _INVALID_HANDLE_VALUE: |
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198 | 228 | _raiseoserror(name) |
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199 | 229 | try: |
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200 | 230 | fi = _BY_HANDLE_FILE_INFORMATION() |
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201 | 231 | if not _kernel32.GetFileInformationByHandle(fh, ctypes.byref(fi)): |
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202 | 232 | _raiseoserror(name) |
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203 | 233 | return fi |
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204 | 234 | finally: |
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205 | 235 | _kernel32.CloseHandle(fh) |
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206 | 236 | |
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207 | 237 | def oslink(src, dst): |
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208 | 238 | try: |
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209 | 239 | if not _kernel32.CreateHardLinkA(dst, src, None): |
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210 | 240 | _raiseoserror(src) |
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211 | 241 | except AttributeError: # Wine doesn't support this function |
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212 | 242 | _raiseoserror(src) |
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213 | 243 | |
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214 | 244 | def nlinks(name): |
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215 | 245 | '''return number of hardlinks for the given file''' |
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216 | 246 | return _getfileinfo(name).nNumberOfLinks |
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217 | 247 | |
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218 | 248 | def samefile(path1, path2): |
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219 | 249 | '''Returns whether path1 and path2 refer to the same file or directory.''' |
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220 | 250 | res1 = _getfileinfo(path1) |
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221 | 251 | res2 = _getfileinfo(path2) |
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222 | 252 | return (res1.dwVolumeSerialNumber == res2.dwVolumeSerialNumber |
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223 | 253 | and res1.nFileIndexHigh == res2.nFileIndexHigh |
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224 | 254 | and res1.nFileIndexLow == res2.nFileIndexLow) |
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225 | 255 | |
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226 | 256 | def samedevice(path1, path2): |
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227 | 257 | '''Returns whether path1 and path2 are on the same device.''' |
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228 | 258 | res1 = _getfileinfo(path1) |
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229 | 259 | res2 = _getfileinfo(path2) |
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230 | 260 | return res1.dwVolumeSerialNumber == res2.dwVolumeSerialNumber |
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231 | 261 | |
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232 | 262 | def testpid(pid): |
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233 | 263 | '''return True if pid is still running or unable to |
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234 | 264 | determine, False otherwise''' |
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235 | 265 | h = _kernel32.OpenProcess(_PROCESS_QUERY_INFORMATION, False, pid) |
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236 | 266 | if h: |
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237 | 267 | try: |
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238 | 268 | status = _DWORD() |
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239 | 269 | if _kernel32.GetExitCodeProcess(h, ctypes.byref(status)): |
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240 | 270 | return status.value == _STILL_ACTIVE |
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241 | 271 | finally: |
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242 | 272 | _kernel32.CloseHandle(h) |
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243 | 273 | return _kernel32.GetLastError() != _ERROR_INVALID_PARAMETER |
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244 | 274 | |
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245 | 275 | def executablepath(): |
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246 | 276 | '''return full path of hg.exe''' |
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247 | 277 | size = 600 |
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248 | 278 | buf = ctypes.create_string_buffer(size + 1) |
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249 | 279 | len = _kernel32.GetModuleFileNameA(None, ctypes.byref(buf), size) |
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250 | 280 | if len == 0: |
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251 | 281 | raise ctypes.WinError |
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252 | 282 | elif len == size: |
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253 | 283 | raise ctypes.WinError(_ERROR_INSUFFICIENT_BUFFER) |
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254 | 284 | return buf.value |
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255 | 285 | |
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256 | 286 | def getuser(): |
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257 | 287 | '''return name of current user''' |
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258 | 288 | size = _DWORD(300) |
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259 | 289 | buf = ctypes.create_string_buffer(size.value + 1) |
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260 | 290 | if not _advapi32.GetUserNameA(ctypes.byref(buf), ctypes.byref(size)): |
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261 | 291 | raise ctypes.WinError |
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262 | 292 | return buf.value |
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263 | 293 | |
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264 | 294 | _signalhandler = [] |
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265 | 295 | |
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266 | 296 | def setsignalhandler(): |
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267 | 297 | '''Register a termination handler for console events including |
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268 | 298 | CTRL+C. python signal handlers do not work well with socket |
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269 | 299 | operations. |
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270 | 300 | ''' |
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271 | 301 | def handler(event): |
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272 | 302 | _kernel32.ExitProcess(1) |
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273 | 303 | |
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274 | 304 | if _signalhandler: |
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275 | 305 | return # already registered |
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276 | 306 | h = _SIGNAL_HANDLER(handler) |
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277 | 307 | _signalhandler.append(h) # needed to prevent garbage collection |
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278 | 308 | if not _kernel32.SetConsoleCtrlHandler(h, True): |
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279 | 309 | raise ctypes.WinError |
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280 | 310 | |
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281 | 311 | def hidewindow(): |
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282 | 312 | |
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283 | 313 | def callback(hwnd, pid): |
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284 | 314 | wpid = _DWORD() |
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285 | 315 | _user32.GetWindowThreadProcessId(hwnd, ctypes.byref(wpid)) |
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286 | 316 | if pid == wpid.value: |
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287 | 317 | _user32.ShowWindow(hwnd, _SW_HIDE) |
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288 | 318 | return False # stop enumerating windows |
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289 | 319 | return True |
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290 | 320 | |
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291 | 321 | pid = _kernel32.GetCurrentProcessId() |
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292 | 322 | _user32.EnumWindows(_WNDENUMPROC(callback), pid) |
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293 | 323 | |
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294 | 324 | def termwidth(): |
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295 | 325 | # cmd.exe does not handle CR like a unix console, the CR is |
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296 | 326 | # counted in the line length. On 80 columns consoles, if 80 |
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297 | 327 | # characters are written, the following CR won't apply on the |
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298 | 328 | # current line but on the new one. Keep room for it. |
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299 | 329 | width = 79 |
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300 | 330 | # Query stderr to avoid problems with redirections |
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301 | 331 | screenbuf = _kernel32.GetStdHandle( |
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302 | 332 | _STD_ERROR_HANDLE) # don't close the handle returned |
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303 | 333 | if screenbuf is None or screenbuf == _INVALID_HANDLE_VALUE: |
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304 | 334 | return width |
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305 | 335 | csbi = _CONSOLE_SCREEN_BUFFER_INFO() |
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306 | 336 | if not _kernel32.GetConsoleScreenBufferInfo( |
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307 | 337 | screenbuf, ctypes.byref(csbi)): |
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308 | 338 | return width |
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309 | 339 | width = csbi.srWindow.Right - csbi.srWindow.Left |
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310 | 340 | return width |
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311 | 341 | |
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342 | def _1stchild(pid): | |
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343 | '''return the 1st found child of the given pid | |
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344 | ||
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345 | None is returned when no child is found''' | |
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346 | pe = _tagPROCESSENTRY32() | |
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347 | ||
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348 | # create handle to list all processes | |
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349 | ph = _kernel32.CreateToolhelp32Snapshot(_TH32CS_SNAPPROCESS, 0) | |
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350 | if ph == _INVALID_HANDLE_VALUE: | |
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351 | raise ctypes.WinError | |
|
352 | try: | |
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353 | r = _kernel32.Process32First(ph, ctypes.byref(pe)) | |
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354 | # loop over all processes | |
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355 | while r: | |
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356 | if pe.th32ParentProcessID == pid: | |
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357 | # return first child found | |
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358 | return pe.th32ProcessID | |
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359 | r = _kernel32.Process32Next(ph, ctypes.byref(pe)) | |
|
360 | finally: | |
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361 | _kernel32.CloseHandle(ph) | |
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362 | if _kernel32.GetLastError() != _ERROR_NO_MORE_FILES: | |
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363 | raise ctypes.WinError | |
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364 | return None # no child found | |
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365 | ||
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366 | class _tochildpid(int): # pid is _DWORD, which always matches in an int | |
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367 | '''helper for spawndetached, returns the child pid on conversion to string | |
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368 | ||
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369 | Does not resolve the child pid immediately because the child may not yet be | |
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370 | started. | |
|
371 | ''' | |
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372 | def childpid(self): | |
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373 | '''returns the child pid of the first found child of the process | |
|
374 | with this pid''' | |
|
375 | return _1stchild(self) | |
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376 | def __str__(self): | |
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377 | # run when the pid is written to the file | |
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378 | ppid = self.childpid() | |
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379 | if ppid is None: | |
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380 | # race, child has exited since check | |
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381 | # fall back to this pid. Its process will also have disappeared, | |
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382 | # raising the same error type later as when the child pid would | |
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383 | # be returned. | |
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384 | return " %d" % self | |
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385 | return str(ppid) | |
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386 | ||
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312 | 387 | def spawndetached(args): |
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313 | 388 | # No standard library function really spawns a fully detached |
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314 | 389 | # process under win32 because they allocate pipes or other objects |
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315 | 390 | # to handle standard streams communications. Passing these objects |
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316 | 391 | # to the child process requires handle inheritance to be enabled |
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317 | 392 | # which makes really detached processes impossible. |
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318 | 393 | si = _STARTUPINFO() |
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319 | 394 | si.cb = ctypes.sizeof(_STARTUPINFO) |
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320 | 395 | |
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321 | 396 | pi = _PROCESS_INFORMATION() |
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322 | 397 | |
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323 | 398 | env = '' |
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324 | 399 | for k in os.environ: |
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325 | 400 | env += "%s=%s\0" % (k, os.environ[k]) |
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326 | 401 | if not env: |
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327 | 402 | env = '\0' |
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328 | 403 | env += '\0' |
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329 | 404 | |
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330 | 405 | args = subprocess.list2cmdline(args) |
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331 | 406 | # Not running the command in shell mode makes Python 2.6 hang when |
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332 | 407 | # writing to hgweb output socket. |
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333 | 408 | comspec = os.environ.get("COMSPEC", "cmd.exe") |
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334 | 409 | args = comspec + " /c " + args |
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335 | 410 | |
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336 | 411 | res = _kernel32.CreateProcessA( |
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337 | 412 | None, args, None, None, False, _CREATE_NO_WINDOW, |
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338 | 413 | env, os.getcwd(), ctypes.byref(si), ctypes.byref(pi)) |
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339 | 414 | if not res: |
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340 | 415 | raise ctypes.WinError |
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341 | 416 | |
|
342 | return pi.dwProcessId | |
|
417 | # _tochildpid because the process is the child of COMSPEC | |
|
418 | return _tochildpid(pi.dwProcessId) | |
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343 | 419 | |
|
344 | 420 | def unlink(f): |
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345 | 421 | '''try to implement POSIX' unlink semantics on Windows''' |
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346 | 422 | |
|
347 | 423 | if os.path.isdir(f): |
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348 | 424 | # use EPERM because it is POSIX prescribed value, even though |
|
349 | 425 | # unlink(2) on directories returns EISDIR on Linux |
|
350 | 426 | raise IOError(errno.EPERM, |
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351 | 427 | "Unlinking directory not permitted: '%s'" % f) |
|
352 | 428 | |
|
353 | 429 | # POSIX allows to unlink and rename open files. Windows has serious |
|
354 | 430 | # problems with doing that: |
|
355 | 431 | # - Calling os.unlink (or os.rename) on a file f fails if f or any |
|
356 | 432 | # hardlinked copy of f has been opened with Python's open(). There is no |
|
357 | 433 | # way such a file can be deleted or renamed on Windows (other than |
|
358 | 434 | # scheduling the delete or rename for the next reboot). |
|
359 | 435 | # - Calling os.unlink on a file that has been opened with Mercurial's |
|
360 | 436 | # posixfile (or comparable methods) will delay the actual deletion of |
|
361 | 437 | # the file for as long as the file is held open. The filename is blocked |
|
362 | 438 | # during that time and cannot be used for recreating a new file under |
|
363 | 439 | # that same name ("zombie file"). Directories containing such zombie files |
|
364 | 440 | # cannot be removed or moved. |
|
365 | 441 | # A file that has been opened with posixfile can be renamed, so we rename |
|
366 | 442 | # f to a random temporary name before calling os.unlink on it. This allows |
|
367 | 443 | # callers to recreate f immediately while having other readers do their |
|
368 | 444 | # implicit zombie filename blocking on a temporary name. |
|
369 | 445 | |
|
370 | 446 | for tries in xrange(10): |
|
371 | 447 | temp = '%s-%08x' % (f, random.randint(0, 0xffffffff)) |
|
372 | 448 | try: |
|
373 | 449 | os.rename(f, temp) # raises OSError EEXIST if temp exists |
|
374 | 450 | break |
|
375 | 451 | except OSError, e: |
|
376 | 452 | if e.errno != errno.EEXIST: |
|
377 | 453 | raise |
|
378 | 454 | else: |
|
379 | 455 | raise IOError(errno.EEXIST, "No usable temporary filename found") |
|
380 | 456 | |
|
381 | 457 | try: |
|
382 | 458 | os.unlink(temp) |
|
383 | 459 | except OSError: |
|
384 | 460 | # The unlink might have failed because the READONLY attribute may heave |
|
385 | 461 | # been set on the original file. Rename works fine with READONLY set, |
|
386 | 462 | # but not os.unlink. Reset all attributes and try again. |
|
387 | 463 | _kernel32.SetFileAttributesA(temp, _FILE_ATTRIBUTE_NORMAL) |
|
388 | 464 | try: |
|
389 | 465 | os.unlink(temp) |
|
390 | 466 | except OSError: |
|
391 | 467 | # The unlink might have failed due to some very rude AV-Scanners. |
|
392 | 468 | # Leaking a tempfile is the lesser evil than aborting here and |
|
393 | 469 | # leaving some potentially serious inconsistencies. |
|
394 | 470 | pass |
|
395 | 471 | |
|
396 | 472 | def makedir(path, notindexed): |
|
397 | 473 | os.mkdir(path) |
|
398 | 474 | if notindexed: |
|
399 | 475 | _kernel32.SetFileAttributesA(path, _FILE_ATTRIBUTE_NOT_CONTENT_INDEXED) |
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