bug#41935: tail: unrecognized file system type 0x786f4256

[Bernhard Voelker]

On 2020-06-18 17:57, Pausch Manfred wrote:
> Hello
> 
> When I tail a logfile that’s located on a VirtualBox guest shared folder than 
> I get this message:
> 
> tail: unrecognized file system type 0x786f4256 for 
> ‘oracle_12102_PSU190716-20200618_174315.log’. please report this to 
> bug-coreutils@gnu.org. reverting to polling
> 
> My setup:
> VirtualBox Guest: Oracle Linux 7.x
> VirtualBox Host: Windows 10
> 
> A directory on the host is mapped into the guest via VirtualBox shared folder 
> and mounted in the guest.
> The process that writes to the logfile runs inside the guest. And tail that 
> follows the logfile also runs inside the guest.

Thanks for the report.
It's unusual that this FS-type slipped through for so long.
The attached fixes it.

An internet search unveils that inotify does not seem to work reliably
for 'vboxsf', and I think that this cannot really reliably work, e.g. if a 
Windows
host exposes a directory on a CIFS share into a Linux guest VM (which works, I 
tried).
Therefore, I've marked 'vboxsf' as a 'remote' file system which uses polling.

Have a nice day,
Berny

0001-stat-tail-add-support-for-the-VBOXSF-file-system.patch
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