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Re: kern/52724: ntfs driver doen't allow ':' in file names.
The following reply was made to PR kern/52724; it has been noted by GNATS.
From: Dave Huang <khym%azeotrope.org@localhost>
To: gnats-bugs%NetBSD.org@localhost, kern-bug-people%netbsd.org@localhost,
Subject: Re: kern/52724: ntfs driver doen't allow ':' in file names.
Date: Mon, 13 Nov 2017 16:59:57 -0600
On 11/13/2017 5:05, trebol4444%gmx.com@localhost wrote:
> In a POSIX environment, all unicode characters except '/' and '\0' must be allowed in file names of a ntfs file system.
> The ntfs driver of NetBSD uses ':' for representing ntfs attributes, making impossible to properly read any file with ':' in its name.
> Write a file with ':' in its name using a POSIX OS without this problem, and try to read it in NetBSD with the kernel's ntfs driver.
Which POSIX OS lets you do that? While Windows NT used to have a POSIX
that was discontinued long ago.
While perhaps technically correct that NTFS filenames can contain ":",
in practice, the vast majority of files on an NTFS filesystem will have
been written by some version of Windows, and the Win32 subsystem does
not allow ":" in filenames. Even the replacement for the POSIX
subsystem, the Windows Subsystem for Linux, doesn't actually store ":"
on disk; if you create a file with a ":" in the name, the actual on-disk
name has the ":" escaped as "#003A". So I would say that if you actually
have an NTFS filesystem with a file that has ":" in the name, you'd have
a lot of trouble reading it on an actual Windows machine.
In Windows, ":" in filenames are used for Alternate Data Streams
E.g., you can "echo text > somefile.txt:somestream" and "more <
somefile.txt:somestream". And alternate data streams are just another
attribute of a file in NTFS. I don't know whether NetBSD's ntfs
implementation allows accessing ADSes, but it sounds like it might if
it's treating ":"s as special. In which case, I don't think it should be
changed to some other character, since that would make it work
differently than an actual Windows machine.
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