Re: [gentoo-user] m.2 nvme stick not what I was expecting at all.

[Michael <confabulate@kintzios.com>]

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On Tuesday, 25 February 2025 14:48:52 Greenwich Mean Time Peter Humphrey 
wrote:
> On Monday 24 February 2025 22:48:26 Greenwich Mean Time Frank Steinmetzger
> 
> wrote:
> > You need a common denominator. ExFat is a good candidate, methinks, as it
> > won’t give any issues with file permissions. Since I’ve never held an iOS
> > device in my hands, I have no idea about what FS they support. But the
> > answer should be just a short DuckDuck away. :)
> 
> I tried exfat on a USB M.2 drive at the weekend. I tripped over soft links:
> I keep a plain copy of /etc with the other tar files for ease of use, and
> of course the run-level entries are all links.
> 
> Yes, permissions are fine, but special files are not - not soft links,
> anyway.

As I understand it neither FAT nor exFAT are POSIX-compatible and Linux 
permissions will not translate across.  Both will acquire the ownership of 
whoever mounts the filesystem - e.g.:

- udisks/GUI will mount them under the ownership of the user executing the 
mounting action in userspace;
- mount command on the CLI will mount them as root.

Any changed ACLs will not survive a remount.

ACLs are possible with NTFS, but they will not translate 1:1 with MSWindows.  
I recall with the ntfs-3g driver you had to add a a file in the root 
directory, or each subdirectory(?), to specify some basic access rights.  I am 
not sure how it works with the in-kernel driver today.

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