Mercurial > hg
annotate mercurial/pure/osutil.py @ 21853:8127b9e798b1
purge: add options for deleting only files or only directories
author | Ben Kehoe <benk@berkeley.edu> |
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date | Thu, 07 Nov 2013 17:24:14 -0800 |
parents | 004f965630d9 |
children | 977102cb12fc |
rev | line source |
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1 # osutil.py - pure Python version of osutil.c |
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2 # |
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3 # Copyright 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 os |
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9 import stat as statmod |
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10 |
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11 def _mode_to_kind(mode): |
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12 if statmod.S_ISREG(mode): |
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13 return statmod.S_IFREG |
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14 if statmod.S_ISDIR(mode): |
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15 return statmod.S_IFDIR |
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16 if statmod.S_ISLNK(mode): |
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17 return statmod.S_IFLNK |
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18 if statmod.S_ISBLK(mode): |
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19 return statmod.S_IFBLK |
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20 if statmod.S_ISCHR(mode): |
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21 return statmod.S_IFCHR |
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22 if statmod.S_ISFIFO(mode): |
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23 return statmod.S_IFIFO |
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24 if statmod.S_ISSOCK(mode): |
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25 return statmod.S_IFSOCK |
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26 return mode |
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27 |
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28 def listdir(path, stat=False, skip=None): |
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29 '''listdir(path, stat=False) -> list_of_tuples |
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30 |
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31 Return a sorted list containing information about the entries |
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32 in the directory. |
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33 |
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34 If stat is True, each element is a 3-tuple: |
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35 |
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36 (name, type, stat object) |
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37 |
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38 Otherwise, each element is a 2-tuple: |
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39 |
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40 (name, type) |
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41 ''' |
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42 result = [] |
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43 prefix = path |
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44 if not prefix.endswith(os.sep): |
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45 prefix += os.sep |
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46 names = os.listdir(path) |
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47 names.sort() |
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48 for fn in names: |
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49 st = os.lstat(prefix + fn) |
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50 if fn == skip and statmod.S_ISDIR(st.st_mode): |
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51 return [] |
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52 if stat: |
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53 result.append((fn, _mode_to_kind(st.st_mode), st)) |
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54 else: |
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55 result.append((fn, _mode_to_kind(st.st_mode))) |
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56 return result |
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57 |
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58 if os.name != 'nt': |
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59 posixfile = open |
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60 else: |
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61 import ctypes, msvcrt |
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62 from errno import ESRCH, ENOENT |
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63 |
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64 _kernel32 = ctypes.windll.kernel32 |
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65 |
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66 _DWORD = ctypes.c_ulong |
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67 _LPCSTR = _LPSTR = ctypes.c_char_p |
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68 _HANDLE = ctypes.c_void_p |
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69 |
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70 _INVALID_HANDLE_VALUE = _HANDLE(-1).value |
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71 |
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72 # CreateFile |
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73 _FILE_SHARE_READ = 0x00000001 |
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74 _FILE_SHARE_WRITE = 0x00000002 |
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75 _FILE_SHARE_DELETE = 0x00000004 |
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76 |
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77 _CREATE_ALWAYS = 2 |
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78 _OPEN_EXISTING = 3 |
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79 _OPEN_ALWAYS = 4 |
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80 |
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81 _GENERIC_READ = 0x80000000 |
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82 _GENERIC_WRITE = 0x40000000 |
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83 |
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84 _FILE_ATTRIBUTE_NORMAL = 0x80 |
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85 |
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86 # open_osfhandle flags |
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87 _O_RDONLY = 0x0000 |
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88 _O_RDWR = 0x0002 |
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89 _O_APPEND = 0x0008 |
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90 |
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91 _O_TEXT = 0x4000 |
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92 _O_BINARY = 0x8000 |
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93 |
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94 # types of parameters of C functions used (required by pypy) |
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95 |
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96 _kernel32.CreateFileA.argtypes = [_LPCSTR, _DWORD, _DWORD, ctypes.c_void_p, |
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97 _DWORD, _DWORD, _HANDLE] |
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98 _kernel32.CreateFileA.restype = _HANDLE |
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99 |
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100 def _raiseioerror(name): |
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101 err = ctypes.WinError() |
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102 # For python 2.4, treat ESRCH as ENOENT like WindowsError does |
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103 # in python 2.5 or later. |
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104 # py24: WindowsError(3, '').errno => 3 |
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105 # py25 or later: WindowsError(3, '').errno => 2 |
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106 errno = err.errno |
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107 if errno == ESRCH: |
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108 errno = ENOENT |
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109 raise IOError(errno, '%s: %s' % (name, err.strerror)) |
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110 |
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111 class posixfile(object): |
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112 '''a file object aiming for POSIX-like semantics |
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113 |
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114 CPython's open() returns a file that was opened *without* setting the |
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115 _FILE_SHARE_DELETE flag, which causes rename and unlink to abort. |
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116 This even happens if any hardlinked copy of the file is in open state. |
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117 We set _FILE_SHARE_DELETE here, so files opened with posixfile can be |
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118 renamed and deleted while they are held open. |
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119 Note that if a file opened with posixfile is unlinked, the file |
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120 remains but cannot be opened again or be recreated under the same name, |
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121 until all reading processes have closed the file.''' |
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122 |
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123 def __init__(self, name, mode='r', bufsize=-1): |
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124 if 'b' in mode: |
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125 flags = _O_BINARY |
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126 else: |
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127 flags = _O_TEXT |
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128 |
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129 m0 = mode[0] |
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130 if m0 == 'r' and '+' not in mode: |
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131 flags |= _O_RDONLY |
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132 access = _GENERIC_READ |
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133 else: |
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134 # work around http://support.microsoft.com/kb/899149 and |
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135 # set _O_RDWR for 'w' and 'a', even if mode has no '+' |
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136 flags |= _O_RDWR |
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137 access = _GENERIC_READ | _GENERIC_WRITE |
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138 |
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139 if m0 == 'r': |
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140 creation = _OPEN_EXISTING |
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141 elif m0 == 'w': |
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142 creation = _CREATE_ALWAYS |
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143 elif m0 == 'a': |
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144 creation = _OPEN_ALWAYS |
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145 flags |= _O_APPEND |
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146 else: |
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147 raise ValueError("invalid mode: %s" % mode) |
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148 |
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149 fh = _kernel32.CreateFileA(name, access, |
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150 _FILE_SHARE_READ | _FILE_SHARE_WRITE | _FILE_SHARE_DELETE, |
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151 None, creation, _FILE_ATTRIBUTE_NORMAL, None) |
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152 if fh == _INVALID_HANDLE_VALUE: |
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153 _raiseioerror(name) |
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154 |
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155 fd = msvcrt.open_osfhandle(fh, flags) |
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156 if fd == -1: |
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157 _kernel32.CloseHandle(fh) |
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158 _raiseioerror(name) |
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159 |
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160 f = os.fdopen(fd, mode, bufsize) |
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161 # unfortunately, f.name is '<fdopen>' at this point -- so we store |
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162 # the name on this wrapper. We cannot just assign to f.name, |
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163 # because that attribute is read-only. |
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164 object.__setattr__(self, 'name', name) |
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165 object.__setattr__(self, '_file', f) |
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166 |
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167 def __iter__(self): |
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168 return self._file |
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169 |
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170 def __getattr__(self, name): |
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171 return getattr(self._file, name) |
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172 |
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173 def __setattr__(self, name, value): |
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174 '''mimics the read-only attributes of Python file objects |
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175 by raising 'TypeError: readonly attribute' if someone tries: |
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176 f = posixfile('foo.txt') |
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177 f.name = 'bla' ''' |
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178 return self._file.__setattr__(name, value) |