setup-storage sets wrong data in /etc/fstab

[Michael Tautschnig]

Hi Nicolas,

> Using FAI 3.4~beta6+experimental2 (also checked with experimental4
> this morning) for squeeze and LVM, I have a funny fstab problem.
> 
> setup-storage looks in /dev/<LVM volume> during installation to
> build /etc/fstab:
> 
> (CMD) readlink -f /dev/vg0/var 1> /tmp/mPvYMCBCMk 2> /tmp/TcD7OA66rq
> Executing: readlink -f /dev/vg0/var
> (STDOUT) /dev/dm-0
> [...]
> (CMD) readlink -f /dev/vg0/swap 1> /tmp/ls625DMAbK 2> /tmp/cAQYclvajY
> Executing: readlink -f /dev/vg0/swap
> (STDOUT) /dev/dm-1
> [...]
> 
> But when the host boots, the links are all mixed up, so it doesn't
> work so well:
> 
> # readlink /dev/vg0/var
> ../dm-1
> # readlink /dev/vg0/swap
> ../dm-2
> ...
> 
> Shouldn't setup-storage use links in /dev/<volume> or /dev/mapper,
> or even UUIDs, rather than /dev/dm-* , for /etc/fstab?
> 

Thanks for the report and debugging effort. Hmm, so doing the readlink thing is
not a good idea it seems, maybe we should change this, yes. But for the moment
I'd suggest you just go for UUIDs, which we might want to make the default. You
can achieve this by adding

fstabkey:uuid

to your disk/LVM config line, like

disk_config lvm fstabkey:uuid

Hope this helps,
Michael

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