Bug#507889: mdadm: initramfs-tools script is broken, system with root on RAID won't boot

Package: mdadm
Version: 2.6.2-2
Severity: critical
Tags: patch
Justification: breaks the whole system

The /usr/share/initramfs-tools/scripts/local-top/mdadm script is broken and
thus an initrd regeneration will render the whole system unbootable. The
problem is with line 65: 
mkdir --parent /dev/md 
as the (busybox version of) mkdir
included on the initrd.img does only handle short options (-p and -m). The
fix is simple, just replace the offending line with:
mkdir -p /dev/md

  Laszlo / atleta

-- Package-specific info:
--- mount output
/dev/md0 on / type ext3 (rw,errors=remount-ro)
tmpfs on /lib/init/rw type tmpfs (rw,nosuid,mode=0755)
proc on /proc type proc (rw,noexec,nosuid,nodev)
sysfs on /sys type sysfs (rw,noexec,nosuid,nodev)
procbususb on /proc/bus/usb type usbfs (rw)
udev on /dev type tmpfs (rw,mode=0755)
tmpfs on /dev/shm type tmpfs (rw,nosuid,nodev)
devpts on /dev/pts type devpts (rw,noexec,nosuid,gid=5,mode=620)
fusectl on /sys/fs/fuse/connections type fusectl (rw)
/dev/md1 on /var/scratch type ext3 (rw,errors=remount-ro)
binfmt_misc on /proc/sys/fs/binfmt_misc type binfmt_misc (rw,noexec,nosuid,nodev)