Arch Linux

Description:
After updating from 0.7.1, my system fails to boot automatically and i am dropped to recovery shell because the mdadm hook fails to create my correctly specified and configured md0 device; thereafter, cryptsetup fails because /dev/md0, where it expects an encrypted root raid0, does not exist.
I can, however, boot the machine by executing:

mdadm --assemble md0
cryptsetup luksOpen /dev/md0 root
exit

So the mdadm.conf file works and so does cryptsetup.

Additional Information:

The mdadm hook file looks like this:

run_hook ()
{
input="$(cat /proc/cmdline)"
mdconfig="/etc/mdadm.conf"
# for partitionable raid, we need to load md_mod first!
modprobe md_mod 2>/dev/null
# If md is specified on commandline, create config file from those parameters.
if [ "$(echo $input | grep "md=")" ]; then
#Create initial mdadm.conf
# scan all devices in /proc/partitions
echo DEVICE partitions > $mdconfig
for i in $input; do
case $i in
# raid
md=[0-9]*,/*)
device="$(echo "$i" | sed -e 's|,/.*||g' -e 's|=||g')"
array="$(echo $i | cut -d, -f2-)"
echo "ARRAY /dev/$device devices=$array" >> $mdconfig
;;
# partitionable raid
md=d[0-9]*,/*)
device="$(echo "$i" | sed -e 's|,/.*||g' -e 's|=|_|g')"
array="$(echo $i | cut -d, -f2-)"
echo "ARRAY /dev/$device devices=$array" >> $mdconfig
;;
# raid UUID
md=[0-9]*,[0-9,a-z]*)
device="$(echo "$i" | sed -e 's|,.*||g' -e 's|=||g')"
array="$(echo $i | cut -d, -f2-)"
echo "ARRAY /dev/$device UUID=$array" >> $mdconfig
;;
# partitionable raid UUID
md=d[0-9]*,[0-9,a-z]*)
device="$(echo "$i" | sed -e 's|,.*||g' -e 's|=|_|g')"
array="$(echo $i | cut -d, -f2-)"
echo "ARRAY /dev/$device UUID=$array" >> $mdconfig
;;
esac
done
# If i add mdadm --assemble md0 here, everything works fine for me...
fi
}
---------------------------------------------------------------------------
Is it normal that this file does not even try to execute mdadm and is a no-op
if /etc/mdadm.conf is already existing/there are no md=... arguments?

---------------------------------------------------------------------------
Output of mkinitcpio -v:
`--> sudo mkinitcpio -v
==> Starting dry run: 2.6.39-ARCH
adding file: /lib/firmware/tigon/tg3_tso5.bin
adding file: /lib/firmware/tigon/tg3_tso.bin
adding file: /lib/firmware/tigon/tg3.bin
adding file: /lib/firmware/iwlwifi-5150-2.ucode
adding file: /lib/firmware/iwlwifi-5000-5.ucode
adding file: /lib/firmware/iwlwifi-6000g2b-5.ucode
adding file: /lib/firmware/iwlwifi-6000g2a-5.ucode
adding file: /lib/firmware/iwlwifi-6050-5.ucode
adding file: /lib/firmware/iwlwifi-6000-4.ucode
adding file: /lib/firmware/iwlwifi-100-5.ucode
adding file: /lib/firmware/iwlwifi-1000-5.ucode
-> Parsing hook: [base]
adding dir: /proc
adding dir: /sys
adding dir: /dev
adding dir: /run
adding dir: //usr/bin
adding dir: //usr/sbin
adding file: /bin/busybox
adding symlink: /lib/libc-2.14.so -> /lib/libc.so.6
adding file: /lib/libc-2.14.so
adding symlink: /lib/ld-2.14.so -> /lib/ld-linux-x86-64.so.2
adding file: /lib/ld-2.14.so
adding file: /sbin/modprobe
adding file: /sbin/blkid
adding symlink: /lib/libblkid.so.1.1.0 -> /lib/libblkid.so.1
adding file: /lib/libblkid.so.1.1.0
adding symlink: /lib/libuuid.so.1.3.0 -> /lib/libuuid.so.1
adding file: /lib/libuuid.so.1.3.0
adding file: /init_functions
adding file: /init
adding file: /etc/modprobe.d/usb-load-ehci-first.conf
-> Parsing hook: [udev]
adding file: /sbin/udevd
adding symlink: /lib/librt-2.14.so -> /lib/librt.so.1
adding file: /lib/librt-2.14.so
adding symlink: /lib/libpthread-2.14.so -> /lib/libpthread.so.0
adding file: /lib/libpthread-2.14.so
adding file: /sbin/udevadm
adding file: /lib/udev/rules.d/50-firmware.rules
adding file: /lib/udev/rules.d/50-udev-default.rules
adding file: /lib/udev/rules.d/60-persistent-storage.rules
adding file: /lib/udev/rules.d/80-drivers.rules
adding file: /lib/udev/firmware
adding file: /lib/udev/ata_id
adding file: /lib/udev/path_id
adding file: /lib/udev/scsi_id
adding file: /lib/udev/usb_id
adding file: /etc/udev/udev.conf
adding file: /hooks/udev
-> Parsing hook: [autodetect]
-> Parsing hook: [scsi]
-> Parsing hook: [usbinput]
-> Parsing hook: [keymap]
adding file: /hooks/keymap
-> Parsing hook: [mdadm]
Custom /etc/mdadm.conf file will be used in initramfs for assembling arrays.
adding file: /etc/mdadm.conf
adding file: /sbin/mdadm
adding file: /lib/udev/rules.d/64-md-raid.rules
adding file: /hooks/mdadm
-> Parsing hook: [encrypt]
adding file: /sbin/cryptsetup
adding symlink: /lib/libcryptsetup.so.1.2.0 -> /lib/libcryptsetup.so.1
adding file: /lib/libcryptsetup.so.1.2.0
adding symlink: /lib/libpopt.so.0.0.0 -> /lib/libpopt.so.0
adding file: /lib/libpopt.so.0.0.0
adding file: /lib/libdevmapper.so.1.02
adding symlink: /lib/libgcrypt.so.11.6.0 -> /lib/libgcrypt.so.11
adding file: /lib/libgcrypt.so.11.6.0
adding symlink: /lib/libgpg-error.so.0.7.0 -> /lib/libgpg-error.so.0
adding file: /lib/libgpg-error.so.0.7.0
adding symlink: /lib/libudev.so.0.11.5 -> /lib/libudev.so.0
adding file: /lib/libudev.so.0.11.5
adding file: /sbin/dmsetup
adding file: /lib/udev/rules.d/10-dm.rules
adding file: /lib/udev/rules.d/13-dm-disk.rules
adding file: /lib/udev/rules.d/95-dm-notify.rules
adding file: /lib/udev/rules.d/11-dm-initramfs.rules
adding file: /hooks/encrypt
-> Parsing hook: [filesystems]
==> Generating module dependencies
==> Dry run complete, use -g IMAGE to generate a real image
------------------------------------------------------------------------------------
The /etc/mdadm.conf file contains a valid configuration for /dev/md0.
------------------------------------------------------------------------------------
Finally, a shortened version of my /etc/mkinitcpio.conf:

MODULES=""
BINARIES=""
FILES=""
HOOKS="base udev autodetect scsi usbinput keymap mdadm encrypt filesystems"
COMPRESSION="xz"

Steps to reproduce:
I do not know; does everything work fine if you use an encrypted root on a raid0 device?