Bug#498784: mdcfg hangs when there is no partition for spare device

[Martin Michlmayr <tbm@cyrius.com>]

Package: mdcfg
Version: 1.27
Severity: serious

I chose 1 partition (sda2) for RAID in partman and entered the RAID
config tool.  I then chose RAID1 with 1 active partition and 1 spare
partition.  I got a prompt asking which partition to use for the
active one and chose sda2.  Then mdcfg hangs.  Looking at the code, it
does (lines 329-331):

db_subst mdcfg/raidsparedevs PARTITIONS "$PARTITIONS"
db_input critical mdcfg/raidsparedevs
db_go

$PARTITIONS is empty in my case and apparently debconf doesn't like an
empty variable for Choices and hangs.

There is a check whethere there are enough partitions available but
this is not run if the RAID level is 1:

REQUIRED=$(($DEV_COUNT + $SPARE_COUNT))
if [ $LEVEL -ne 1 ]; then
    if [ $REQUIRED -gt $NUM_PART ]; then
        db_subst mdcfg/notenoughparts NUM_PART "$NUM_PART"

Any idea why this check is not run for RAID level 1?
-- 
Martin Michlmayr
http://www.cyrius.com/