[bug #48228] grub-mkconfig assumes grub-probe will only produce 1 line of output, breaks with mirrored zfs volumes

[spongman]

Follow-up Comment #4, bug #48228 (project grub):

I'm seeing the same issue - the grub-mkconfig is written entirely with the
assumption that only one device is returned from grub-probe. which is not true
in the case of multi-device zfs pools.

for example, for me 'grub-probe --target=device /' returns:
  /dev/sda1
  /dev/sdb1
  /dev/sdc1
  /dev/sdd1
  /dev/sde1

which completely breaks grub-mkconfig.

the 'head -n1' hack doesn't work for me, since this is a raidz pool which
requires at least 4 out of the 5 devices to be passed to the 'grub-probe
--target=fs' call in 10_linux in order for it to be able to discover the fs
type.

IMO, grub-mkconfig needs to be rewritten in order to handle multiple-device
roots. i'd recommend replacing all calls to 'grub-probe --device <device>' to
'grub-probe <path>'. obviously that's a rather large change that'll break a
whole bunch of existing scripts.

Either that, or grub-mkconfig needs to detect the multiple device case and
throw a not-supported error.

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