annotate mercurial/pure/osutil.py @ 51700:7f0cb9ee0534

Backout accidental publication of a large range of revisions I accidentally published 25e7f9dcad0f::bd1483fd7088, this is the inverse.
author Raphaël Gomès <rgomes@octobus.net>
date Tue, 23 Jul 2024 10:02:46 +0200
parents 18c8c18993f0
children f4733654f144
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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 Olivia Mackall <olivia@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
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6 # GNU General Public License version 2 or any later version.
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7
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8
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9 import ctypes
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10 import ctypes.util
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11 import os
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12 import stat as statmod
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13
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14 from .. import (
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15 encoding,
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16 pycompat,
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17 )
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18
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19
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20 def _mode_to_kind(mode):
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21 if statmod.S_ISREG(mode):
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22 return statmod.S_IFREG
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23 if statmod.S_ISDIR(mode):
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24 return statmod.S_IFDIR
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25 if statmod.S_ISLNK(mode):
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26 return statmod.S_IFLNK
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27 if statmod.S_ISBLK(mode):
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28 return statmod.S_IFBLK
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29 if statmod.S_ISCHR(mode):
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30 return statmod.S_IFCHR
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31 if statmod.S_ISFIFO(mode):
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32 return statmod.S_IFIFO
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33 if statmod.S_ISSOCK(mode):
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34 return statmod.S_IFSOCK
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35 return mode
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36
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37
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38 def listdir(path, stat=False, skip=None):
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39 """listdir(path, stat=False) -> list_of_tuples
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40
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41 Return a sorted list containing information about the entries
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42 in the directory.
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43
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44 If stat is True, each element is a 3-tuple:
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45
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46 (name, type, stat object)
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47
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48 Otherwise, each element is a 2-tuple:
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49
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50 (name, type)
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51 """
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52 result = []
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53 prefix = path
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54 if not prefix.endswith(pycompat.ossep):
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55 prefix += pycompat.ossep
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56 names = os.listdir(path)
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57 names.sort()
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58 for fn in names:
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59 st = os.lstat(prefix + fn)
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60 if fn == skip and statmod.S_ISDIR(st.st_mode):
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61 return []
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62 if stat:
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63 result.append((fn, _mode_to_kind(st.st_mode), st))
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64 else:
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65 result.append((fn, _mode_to_kind(st.st_mode)))
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66 return result
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67
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68
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69 if not pycompat.iswindows:
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70 posixfile = open
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71
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72
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73 else:
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74 import msvcrt
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75
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76 _kernel32 = ctypes.windll.kernel32 # pytype: disable=module-attr
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77
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78 _DWORD = ctypes.c_ulong
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79 _LPCSTR = _LPSTR = ctypes.c_char_p
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80 _HANDLE = ctypes.c_void_p
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81
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82 _INVALID_HANDLE_VALUE = _HANDLE(-1).value
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83
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84 # CreateFile
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85 _FILE_SHARE_READ = 0x00000001
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86 _FILE_SHARE_WRITE = 0x00000002
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87 _FILE_SHARE_DELETE = 0x00000004
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88
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89 _CREATE_ALWAYS = 2
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90 _OPEN_EXISTING = 3
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91 _OPEN_ALWAYS = 4
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92
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93 _GENERIC_READ = 0x80000000
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94 _GENERIC_WRITE = 0x40000000
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95
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96 _FILE_ATTRIBUTE_NORMAL = 0x80
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97
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98 # open_osfhandle flags
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99 _O_RDONLY = 0x0000
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100 _O_RDWR = 0x0002
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101 _O_APPEND = 0x0008
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102
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103 _O_TEXT = 0x4000
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104 _O_BINARY = 0x8000
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105
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106 # types of parameters of C functions used (required by pypy)
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107
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108 _kernel32.CreateFileA.argtypes = [
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109 _LPCSTR,
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110 _DWORD,
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111 _DWORD,
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112 ctypes.c_void_p,
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113 _DWORD,
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114 _DWORD,
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115 _HANDLE,
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116 ]
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117 _kernel32.CreateFileA.restype = _HANDLE
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118
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119 def _raiseioerror(name):
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120 err = ctypes.WinError() # pytype: disable=module-attr
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121 raise IOError(
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122 err.errno, '%s: %s' % (encoding.strfromlocal(name), err.strerror)
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123 )
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124
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125 class posixfile:
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126 """a file object aiming for POSIX-like semantics
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127
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128 CPython's open() returns a file that was opened *without* setting the
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129 _FILE_SHARE_DELETE flag, which causes rename and unlink to abort.
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130 This even happens if any hardlinked copy of the file is in open state.
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131 We set _FILE_SHARE_DELETE here, so files opened with posixfile can be
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132 renamed and deleted while they are held open.
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133 Note that if a file opened with posixfile is unlinked, the file
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134 remains but cannot be opened again or be recreated under the same name,
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135 until all reading processes have closed the file."""
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136
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137 def __init__(self, name, mode=b'r', bufsize=-1):
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138 if b'b' in mode:
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139 flags = _O_BINARY
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140 else:
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141 flags = _O_TEXT
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142
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143 m0 = mode[0:1]
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144 if m0 == b'r' and b'+' not in mode:
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145 flags |= _O_RDONLY
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146 access = _GENERIC_READ
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147 else:
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148 # work around http://support.microsoft.com/kb/899149 and
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149 # set _O_RDWR for 'w' and 'a', even if mode has no '+'
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150 flags |= _O_RDWR
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151 access = _GENERIC_READ | _GENERIC_WRITE
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152
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153 if m0 == b'r':
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154 creation = _OPEN_EXISTING
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155 elif m0 == b'w':
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156 creation = _CREATE_ALWAYS
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157 elif m0 == b'a':
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158 creation = _OPEN_ALWAYS
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159 flags |= _O_APPEND
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160 else:
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161 raise ValueError("invalid mode: %s" % pycompat.sysstr(mode))
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162
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163 fh = _kernel32.CreateFileA(
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164 name,
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165 access,
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166 _FILE_SHARE_READ | _FILE_SHARE_WRITE | _FILE_SHARE_DELETE,
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167 None,
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168 creation,
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169 _FILE_ATTRIBUTE_NORMAL,
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170 None,
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171 )
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172 if fh == _INVALID_HANDLE_VALUE:
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173 _raiseioerror(name)
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174
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175 fd = msvcrt.open_osfhandle(fh, flags) # pytype: disable=module-attr
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176 if fd == -1:
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177 _kernel32.CloseHandle(fh)
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178 _raiseioerror(name)
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179
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180 f = os.fdopen(fd, pycompat.sysstr(mode), bufsize)
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181 # unfortunately, f.name is '<fdopen>' at this point -- so we store
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182 # the name on this wrapper. We cannot just assign to f.name,
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183 # because that attribute is read-only.
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184 object.__setattr__(self, 'name', name)
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185 object.__setattr__(self, '_file', f)
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186
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187 def __iter__(self):
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188 return self._file
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189
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190 def __getattr__(self, name):
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191 return getattr(self._file, name)
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192
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193 def __setattr__(self, name, value):
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194 """mimics the read-only attributes of Python file objects
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195 by raising 'TypeError: readonly attribute' if someone tries:
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196 f = posixfile('foo.txt')
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197 f.name = 'bla'
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198 """
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199 return self._file.__setattr__(name, value)
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200
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201 def __enter__(self):
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202 self._file.__enter__()
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203 return self
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204
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205 def __exit__(self, exc_type, exc_value, exc_tb):
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206 return self._file.__exit__(exc_type, exc_value, exc_tb)