Bug#590742: grub-pc: savedefault doesn't work on mdraid

[Mario 'BitKoenig' Holbe]

Package: grub-pc
Version: 1.98+20100710-1

Hello,

savedefault doesn't work on Linux Software-RAID raid1. Well, at least I
guess it's because of the RAID.
The system in question has /boot on ext2 on md raid1 (degraded) on GPT
disk partitions.

I don't know whether write to raid1 is supposed to work. However, what
really takes me aback is that save_env doesn't give an error - I think
it should do that at least when it doesn't save.
Actually, I'm a little bit nervous due to the missing error message
because there it a chance that it does in fact write - somewhere.

$ grep boot /proc/mounts
/dev/md0 /boot ext2 rw,nosuid,nodev,noexec,relatime 0 0
$ grep -A2 ^md0 /proc/mdstat
md0 : active raid1 sda2[0] sdb2[1]
      240832 blocks [3/2] [UU_]

$

savedefault works on another system with the same package version,
without raid1, with a MBR disk and /boot on the rootfs. I created the
grubenv file the same way on both systems via grub-editenv create, both
systems have GRUB_SAVEDEFAULT=true, GRUB_DEFAULT=saved, and an uptodate
grub.cfg with savedefault in the menuentries.

The system in question *reads* grubenv - when I set it to another
menuentry with grub-set-default grub respects this on boot and selects
the other menuentry.

The differences I see (despite different CPU, RAM, ...) are GPT, raid1,
and /boot on a separate filesystem. I suspect raid1 to be the most
relevant difference here :)

On both systems I tried
grub> cat /grub/grubenv		(/boot/grub/grubenv on the working one)
...
grub> saved_entry=foo
grub> save_env saved_entry
grub> cat /grub/grubenv
...

On the working system the second cat reflects the change. On the system
in question, grubenv's content didn't change.


regards
   Mario
-- 
I heard, if you play a NT-CD backwards, you get satanic messages...
That's nothing. If you play it forwards, it installs NT.
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