Comment 19 for bug 432254

I've now got os-prober to detect and create chainloader menu stanzas for NetBSD and FreeBSD.
The key is to call blkid again with the -p option when a UFS partition is detected to return the ufs type and to mount the partition with the proper ufstype parameter to the mount commant.

To use the native GRUB commands will require more work. However since both NetBSD and FreeBSD provide their own boot menus when chainloaded to allow the user to do such things as boot single-user etc there may not be any mileage in using the native GRUB commands, certainly on FreeBSD where there doesn't seem to be any way of bypassing the FreeBSD boot menu.

Unfortunately blkid, on my test machine at least, intermittently finds two copies of FreeBSD, the second a duplicate of the real one but in a 'phantom' partition. And blkid doesn't recognise an OpenBSD partition at all - presumably because the ufs-magic numbers don't match.

So if a short term 'fix' is required then the best thing may be to have the 50-mounted script emit a suitable message when a UFS partition is detected, pointing the user to a set of example stanzas per Peter Belew's example for FreeBSD above.

I will continue to look at blkid as time permits.

The easy way to blkid doesn't recognise a