pkg_tool() {
    local ret=1
    unset pacdblck_exist
    pacdblck='/var/lib/pacman/db.lck'
    if [ -f "$pacdblck" ]
        then
            pacdblck_exist=1
            rm -f "$pacdblck"
    fi
    LANG= sh -c "$@"
    ret="$?"
    if [ "$pacdblck_exist" == 1 ]
        then touch "$pacdblck"
    fi
    return $ret
}
export -f pkg_tool

## arg 1:  the new package version
pre_install() {
    if ! grep -q cachyos /etc/pacman.conf
        then
            echo '
[cachyos]
Server = https://cdn.cachyos.org/repo/$arch/$repo
Server = https://cdn-1.cachyos.org/$arch/$repo
Server = https://cdn77.cachyos.org/repo/$arch/$repo
' >> /etc/pacman.conf
            pkg_tool 'yes|pac -Sy proton-cachyos'
    fi
}

## arg 1:  the new package version
#post_install() {
    # do something here
#}

## arg 1:  the new package version
## arg 2:  the old package version
pre_upgrade() {
    pre_install
}

## arg 1:  the new package version
## arg 2:  the old package version
post_upgrade() {
    pac -Q zenity 2>/dev/null|grep -q '4\.[0-9]\.[0-9]' && \
    pkg_tool 'yes|sudo downgrade zenity=3.44.2'

    if [ "$RUNIMAGE_VERSION" == '0.39.1' ]
        then
            pac -Q chromium &>/dev/null && \
            pkg_tool 'yes|pac -Rsndd chromium'

            pac -Q amdvlk &>/dev/null && \
            pkg_tool 'yes|pac -Rsndd amdvlk'

            pac -Q lib32-amdvlk &>/dev/null && \
            pkg_tool 'yes|pac -Rsndd lib32-amdvlk'

            pac -Q glibc-eac lib32-glibc-eac &>/dev/null||\
            pkg_tool 'yes|pac -Sy glibc-eac lib32-glibc-eac'
    fi

    pac -Q GE-Proton &>/dev/null && \
    pkg_tool 'yes|pac -Rsndd GE-Proton'

    local LWRUN="$HOME/.local/share/LuxWine/bin/lwrun"
    if [ -f "$LWRUN" ]
        then
            env -u LD_PRELOAD lwrap --install
            for link in lwrap xterm
                do
                    local link_path="$HOME/.local/share/LuxWine/bin/$link"
                    if [ ! -L "$link_path" ]
                        then ln -sfr "$LWRUN" "$link_path"
                    fi
            done
    fi

    if grep -q nocap /usr/lib/steam/steam 2>/dev/null
        then sed -i 's| nocap||' /usr/lib/steam/steam
    fi

    sed -i 's|URUNTIME_MOUNT=[0-9]|URUNTIME_MOUNT=2|' /var/RunDir/sharun/bin/uruntime
    echo RIM_CMPRS_BSIZE=18 >> "$RIMENVFL"

    return 0
}

## arg 1:  the old package version
#pre_remove() {
    # do something here
#}

## arg 1:  the old package version
#post_remove() {
    # do something here
#}