schroot: mount: exec mount_nullfs not found: No such file or directory

[Damien Raude-Morvan <drazzib@drazzib.com>]

Hi BSD Porters,

Since last December, I'm unable to use sbuild/schroot on an unstable box :

~# sbuild-update -ugdc unstable
E: 10mount: mount: exec mount_nullfs not found: No such file or directory
E: unstable-kfreebsd-amd64-sbuild-1329077042-35644: Chroot setup failed: 
stage=setup-start
Chroot setup failed
Error setting up unstable chroot
Chroot setup failed at /usr/bin/sbuild-update line 166.

FTR:
1) I can manually mount -t nullfs via sudo
2) I haven't made any change to PATH
3) AFAIK, mount can't find its helper in /sbin/

This issue is tracked as #650978.

Does anybody have a clue ?

Regards,
--
Damien