I wrote a patch to archiso to work with recent changes to mkinitcpio to support mount hooks.

archiso hook works, all is mounted fine, but the only issue is at init script when testing with stat, from the shell I can kill udevd, umount proc and sys, and continue manually executing switch_root.

Here is the problem, stat return the same number.
/ # stat -f -c %i /
0
/ # stat -f -c %i /new_root
0

can be this test replaced (or maybe OR'ed) by %t/%T? this returns differents numbers.

/ # cat /proc/mounts
rootfs / rootfs rw 0 0
proc /proc proc rw,relatime 0 0
sys /sys sysfs rw,relatime 0 0
tmpfs /tmpfs tmpfs rw,relatime,size=93040k 0 0
/dev/archiso /bootmnt udf ro,relatime,utf8 0 0
none /new_root aufs rw,relatime,si=7466434 0 0
/dev/loop0 /tmpfs/mnt/loop0 squashfs ro,relatime 0 0
/dev/loop1 /tmpfs/mnt/loop1 squashfs ro,relatime 0 0
/dev/archiso /new_root/bootmnt udf ro,relatime,utf8 0 0

Thanks in advance.