Eryk Sun <eryk...@gmail.com> added the comment:
_sanitize_windows_name() fails to translate the reserved control characters
(0x01-0x1F) and backslash in names.
What I've seen done in some cases (e.g. Unix network shares mapped to SMB) is
to translate names using the private use area block, e.g. 0xF001 - 0xF07F.
Windows has no problem with characters in this range in a filename. (Displaying
these characters sensibly is another matter.) For Windows 10, this is
especially useful since the Linux subsystem automatically translates this PUA
block back to ASCII when accessing a Windows volume via drvfs. For example:
C:\Temp\pua>python -q
>>> import sys
>>> sys.platform
'win32'
>>> name = ''.join(map(chr, range(0xf001, 0xf080)))
>>> _ = open(name, 'w')
>>> ^Z
C:\Temp\pua>bash -c "python3 -q"
>>> import os, sys
>>> sys.platform
'linux'
>>> os.listdir()
['\x01\x02\x03\x04\x05\x06\x07\x08\t\n\x0b\x0c\r\x0e\x0f
\x10\x11\x12\x13\x14\x15\x16\x17\x18\x19\x1a\x1b\x1c\x1d\x1e\x1f
!"#$%&\'()*+,-./0123456789:;<=>?
@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\]^_
`abcdefghijklmnopqrstuvwxyz{|}~\x7f']
Also, while _sanitize_windows_name() handles trailing dots, for some reason it
overlooks trailing spaces. It also doesn't handle reserved DOS device names.
The reserved names include NUL, CON, CONIN$, CONOUT$, AUX, PRN, COM[1-9],
LPT[1-9], and these names plus zero or more spaces and possibly a dot or colon
and any subsequent characters. For example:
>>> os.path._getfullpathname('con')
'\\\\.\\con'
>>> os.path._getfullpathname('con ')
'\\\\.\\con'
>>> os.path._getfullpathname('con:')
'\\\\.\\con'
>>> os.path._getfullpathname('con :')
'\\\\.\\con'
>>> os.path._getfullpathname('con : spam')
'\\\\.\\con'
>>> os.path._getfullpathname('con . eggs')
'\\\\.\\con'
It's not a reserved device name if the first character after zero or more
spaces is not a dot or colon. For example:
>>> os.path._getfullpathname('con spam')
'C:\\con spam'
We can create filenames with reserved device names or trailing spaces and dots
by using a \\?\ prefixed path (i.e. a non-normalized device path). However,
most programs don't use \\?\ paths, so it's probably better to translate these
names.
----------
nosy: +eryksun
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<https://bugs.python.org/issue36534>
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