OpenWrt – Rev 1

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#!/bin/sh
# Copyright (C) 2006-2013 OpenWrt.org
# Copyright (C) 2010 Vertical Communications

boot_hook_splice_start() {
        export -n PI_HOOK_SPLICE=1
}

boot_hook_splice_finish() {
        local hook
        for hook in $PI_STACK_LIST; do
                local v; eval "v=\${${hook}_splice:+\$${hook}_splice }$hook"
                export -n "${hook}=${v% }"
                export -n "${hook}_splice="
        done
        export -n PI_HOOK_SPLICE=
}

boot_hook_init() {
        local hook="${1}_hook"
        export -n "PI_STACK_LIST=${PI_STACK_LIST:+$PI_STACK_LIST }$hook"
        export -n "$hook="
}

boot_hook_add() {
        local hook="${1}_hook${PI_HOOK_SPLICE:+_splice}"
        local func="${2}"

        [ -n "$func" ] && {
                local v; eval "v=\$$hook"
                export -n "$hook=${v:+$v }$func"
        }
}

boot_hook_shift() {
        local hook="${1}_hook"
        local rvar="${2}"

        local v; eval "v=\$$hook"
        [ -n "$v" ] && {
                local first="${v%% *}"

                [ "$v" != "${v#* }" ] && \
                        export -n "$hook=${v#* }" || \
                        export -n "$hook="

                export -n "$rvar=$first"
                return 0
        }

        return 1
}

boot_run_hook() {
        local hook="$1"
        local func

        while boot_hook_shift "$hook" func; do
                local ran; eval "ran=\$PI_RAN_$func"
                [ -n "$ran" ] || {
                        export -n "PI_RAN_$func=1"
                        $func "$1" "$2"
                }
        done
}

pivot() { # <new_root> <old_root>
        /bin/mount -o noatime,move /proc $1/proc && \
        pivot_root $1 $1$2 && {
                /bin/mount -o noatime,move $2/dev /dev
                /bin/mount -o noatime,move $2/tmp /tmp
                /bin/mount -o noatime,move $2/sys /sys 2>&-
                /bin/mount -o noatime,move $2/overlay /overlay 2>&-
                return 0
        }
}

fopivot() { # <rw_root> <work_dir> <ro_root> <dupe?>
        /bin/mount -o noatime,lowerdir=/,upperdir=$1,workdir=$2 -t overlay "overlayfs:$1" /mnt
        pivot /mnt $3
}

ramoverlay() {
        mkdir -p /tmp/root
        /bin/mount -t tmpfs -o noatime,mode=0755 root /tmp/root
        mkdir -p /tmp/root/root /tmp/root/work
        fopivot /tmp/root/root /tmp/root/work /rom 1
}