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
>From f5644c986ce39c6ca5fffbae30a2828b8ee56502 Mon Sep 17 00:00:00 2001 From: Bernhard Voelker <m...@bernhard-voelker.de> Date: Fri, 19 Jun 2020 20:33:55 +0200 Subject: [PATCH] stat,tail: add support for the VBOXSF file system * src/stat.c (human_fstype): Add case for the 'vboxsf' file system type which is used for VirtualBox Shared Folders mounted in VirtualBox guest VMs. * NEWS: Mention the Improvement. Fixes https://bugs.gnu.org/41935 --- NEWS | 5 +++++ src/stat.c | 2 ++ 2 files changed, 7 insertions(+) diff --git a/NEWS b/NEWS index 655ff779f..d36259641 100644 --- a/NEWS +++ b/NEWS @@ -26,6 +26,11 @@ GNU coreutils NEWS -*- outline -*- ls --classify now supports the "always", "auto", or "never" flags, to support only outputting classifier characters if connected to a tty. +** Improvements + + stat and tail now know about the "vboxsf" file system type. + stat -f -c%T now reports the file system type, and tail -f uses polling. + * Noteworthy changes in release 8.32 (2020-03-05) [stable] diff --git a/src/stat.c b/src/stat.c index 5012622c3..4e6c2aa86 100644 --- a/src/stat.c +++ b/src/stat.c @@ -527,6 +527,8 @@ human_fstype (STRUCT_STATVFS const *statfsbuf) return "usbdevfs"; case S_MAGIC_V9FS: /* 0x01021997 local */ return "v9fs"; + case S_MAGIC_VBOXSF: /* 0x786F4256 remote */ + return "vboxsf"; case S_MAGIC_VMHGFS: /* 0xBACBACBC remote */ return "vmhgfs"; case S_MAGIC_VXFS: /* 0xA501FCF5 remote */ -- 2.27.0
