core/kernel/tools/mkinitcpio/files/live_hook

#!/usr/bin/bash
# See: https://gitlab.com/tearch-linux/applications-and-tools/mkinitcpio-teaiso

live_mount(){
    mkdir -p /pisi/a # upper
    mkdir -p /pisi/b # workdir
    mkdir -p /live_root/
    mkdir -p /new_root/
    mkdir -p /source/ # lower
    mount $root /new_root/ 2> /dev/null
    mount /new_root/live/pisi.sfs /source/ 2> /dev/null
    mount -t overlay -o lowerdir=/source/,upperdir=/pisi/a/,workdir=/pisi/b overlay /live_root
    mount -t tmpfs -o size=100% none /pisi/a
    mount -t tmpfs -o size=100% none /pisi/b
    [ -d /source/merge/ ] && cp -prfv /source/merge/* /live_root/
    mount --bind /live_root /new_root/
    mkdir /new_root/cdrom/ 2> /dev/null
    mkdir /new_root/source/ 2> /dev/null
    mount $root /new_root/cdrom/ 2> /dev/null
    mount /new_root/cdrom/live/pisi.sfs /new_root/source/ 2> /dev/null
    [ "$home" != "" ] && mount $home /new_root/home 2>/dev/null
}

is_file_avaiable(){
    disktmp=$(mktemp)
    rm -f $disktmp
    mkdir -p $disktmp || true
    timeout 10 mount -t auto "$1" $disktmp &>/dev/null
    [ -f "$disktmp/$2" ] && [ -b "$1" ]
    status=$?
    umount -lf $disktmp 2>/dev/null
    return $status
}

run_hook() {
    # live-boot
    if cat /proc/cmdline | grep "boot=live" >/dev/null ; then
    while [ "$root" == "" ] ; do
		list=$(ls /sys/class/block/ | grep ".*[0-9]$" | grep -v loop | grep -v ram | grep -v nbd | grep -v fd | sed "s|^|/dev/|g")
		for part in $list
		do
			sleep 0.1
			echo "Looking for: $part"
			if is_file_avaiable "$part" "/live/pisi.sfs"
			then
				export root=$part
            elif is_file_avaiable "$part" "/mount-me" 
            then
        		export home=$part
			fi
		done
	done
    export mount_handler="live_mount"
    fi
}

run_latehook(){
    if ! cat /proc/cmdline | grep "init=" ; then
        export init=/sbin/init
    fi
    sleep 0.3
}