#!/bin/sh
export PATH=/bin

# follow the default linux cpio:
#dir /dev 0755 0 0
#nod /dev/console 0600 0 0 c 5 1
#dir /root 0700 0 0

mkdir /proc
mount -t proc proc /proc
mkdir /sys
mount -t sysfs sysfs /sys
mkdir /dev
mount -t devtmpfs devtmpfs /dev
mkdir /dev/pts
mount -t devpts devpts /dev/pts

printf 'INITRAMFS:ENVIRONMENT -- START\n'
	env
printf 'INITRAMFS:ENVIRONMENT -- END\n'
printf 'INITRAMFS:PARAMETERS -- START\n'
if test -n "$*"; then
	printf "$*\n"
fi
printf 'INITRAMFS:PARAMETERS -- END\n'

if test -z "$initramfs_root_uuid"; then
	printf 'INITRAMFS:no root uuid in environment\n'
	for p in "$@"
	do
		printf "INITRAMFS:init parameters:$p\n"
		if test ${p%%=*} = initramfs_root_uuid; then
			initramfs_root_uuid=${p#*=}
			break;
		fi
	done
fi

if test -z "$initramfs_root_uuid"; then
	printf 'INITRAMFS:unable to find the root uuid\n'
	exit 1
else
	printf "INITRAMFS_ROOT_UUID=$initramfs_root_uuid\n"
fi

# we serialize the handling of modprobes and uevents

# we start to listen to uevents now, they will be buffered
uevent /uevt.sh &
uevt_sh_pid=$!
printf "INITRAMFS:uevt.sh PID=$uevt_sh_pid\n"
printf '/bin/modprobe' >/proc/sys/kernel/modprobe

# we want /dev/sdX interfaces
modprobe sd_mod
# we choose a crc32c implementation, sse4.2 one
modprobe crc32c_intel

printf 'INITRAMFS:COLDPLUG -- START\n'
# cold plug modules loading
# the disk drivers packaged in the initramfs will be loaded and then, their
# partitions will become known to the kernel
find /sys/devices -name modalias -exec sort -u '{}' + >/modaliases
xargs -n 1 modprobe -q </modaliases
touch /COLDPLUG_DONE
printf 'INITRAMFS:COLDPLUG -- END\n'

printf "INITRAMFS:WAITING FOR $initramfs_root_uuid -- START\n"
while true
do
	if blk=$(findfs UUID=$initramfs_root_uuid); then
		fs_desc=$(blkid $blk)
		for f in $fs_desc
		do
			if test ${f%%=*} = TYPE; then
				fs=${f#*=}
				fs=$(printf "$fs" | tr -d '"')
				break
			fi
		done
		break
	fi
	sleep 0.001
done
printf "INITRAMFS:WAITING FOR $initramfs_root_uuid -- END\n"

modprobe $fs 
printf "INITRAMFS:KILLING uevt.sh PID=$uevt_sh_pid\n"
# the "real init" will start mudev which will load drivers with a full module
# tree
kill $uevt_sh_pid

printf "INITRAMFS:MOUNTING $initramfs_root_uuid as TYPE=$fs\n"
mkdir /newroot
mount -o relatime -t $fs $blk /newroot
printf "INITRAMFS:UMOUNTING /DEV{/PTS} /SYS /PROC, SWITCHING ROOT AND EXEC /bin/init\n"
umount /dev/pts
umount /dev
umount /sys
umount /proc
# _MUST_ use switch_root, must use exec to be PID 1
exec switch_root /newroot /bin/init