akshara/akshara.hook

#!/bin/bash

run_latehook() {
    echo

    # Remove /new_root/.successful-update if exists
    rm -f /new_root/.successful-update /new_root/.update

    # Detect if update downloaded.
    if [[ -d /new_root/.update_rootfs ]]; then
        # Available, rename old /usr and move new /usr to /.
        if [[ -d /new_root/.update_rootfs/usr ]]; then
            mv /new_root/usr /new_root/.old.usr
            mv /new_root/.update_rootfs/usr /new_root/usr
        fi

        # Same for /etc.
        if [[ -d /new_root/.update_rootfs/etc ]]; then
            mv /new_root/.update_rootfs/etc /new_root/usr/etc
        fi
        if [[ -d /new_root/.new.etc ]]; then
            mv /new_root/etc /new_root/.old.etc
            mv /new_root/.new.etc /new_root/etc
        fi

        # Same for /opt
        if [[ -d /new_root/.update_rootfs/opt ]]; then
            mv /new_root/opt /new_root/.old.opt
            mv /new_root/.update_rootfs/opt /new_root/opt
        fi

        # Same for /var.
        if [[ -d /new_root/.new.var.lib ]]; then
            mv /new_root/var/lib /new_root/.old.var.lib
            mv /new_root/.new.var.lib /new_root/var/lib
        fi
        if [[ -d /new_root/.update_rootfs/var/cache/pacman ]]; then
            mv /new_root/var/cache/pacman /new_root/.old.var.cache.pacman 
            mv /new_root/.update_rootfs/var/cache/pacman /new_root/var/cache/pacman
        fi

        mv /new_root/.update_rootfs /new_root/.old.update_rootfs
        touch /new_root/.successful-update
    fi

    for i in usr varlibpacman usrlocal; do
        rm -rf /new_root/.blend-overlays/$i.workdir
        mkdir -p /new_root/.blend-overlays/$i
        mkdir -p /new_root/.blend-overlays/$i.workdir
    done

    mount -t overlay overlay -o index=off -o metacopy=off -o ro,lowerdir=/new_root/usr,upperdir=/new_root/.blend-overlays/usr,workdir=/new_root/.blend-overlays/usr.workdir /new_root/usr
    mount -t overlay overlay -o index=off -o metacopy=off -o ro,lowerdir=/new_root/var/lib/pacman,upperdir=/new_root/.blend-overlays/varlibpacman,workdir=/new_root/.blend-overlays/varlibpacman.workdir /new_root/var/lib/pacman
    mount -t overlay overlay -o rw,lowerdir=/new_root/usr/local,upperdir=/new_root/.blend-overlays/usrlocal,workdir=/new_root/.blend-overlays/usrlocal.workdir /new_root/usr/local
}