pbulk issues

[John Klos <john%ziaspace.com@localhost>]

pbulk has issues sometimes in a standard chroot sandbox (not a nullmounted 
sandbox:

........... 13961/13961
Resolving...
Building...
Initialisation complete.
[1363/16766] Starting build of  digest-20121220
/usr/pbulk/libexec/pbulk/pkg-build: 
/tmp/pkgtools/digest/work/.packages/digest-20121220.tgz: permission denied
[1363/16766] Failed to build    digest-20121220
[16708/16766] Starting build of  osabi-NetBSD-7.0
/usr/pbulk/libexec/pbulk/pkg-build: 
/tmp/pkgtools/osabi/work/.packages/osabi-NetBSD-7.0.tgz: permission denied
[16708/16766] Failed to build    osabi-NetBSD-7.0
[16712/16766] Starting build of  bsdtar-3.1.2nb1
/usr/pbulk/libexec/pbulk/pkg-build: 
/tmp/archivers/bsdtar/work/.packages/bsdtar-3.1.2nb1.tgz: permission 
denied
[16712/16766] Failed to build    bsdtar-3.1.2nb1
[16713/16766] Starting build of  zonetab-0
...

Does anyone know what pbulk is trying to do that isn't working? I've now 
seen this on amd64 and earmv7hf systems.

Thanks,
John