arch-ppa/src/evdi-git/evdi-git.install

# old version (without -$pkgrel): ${1%%-*}
# new version (without -$pkgrel): ${2%%-*}

post_install() {
    echo 'DKMS install...'
    dkms install evdi/${1%%-*}
}

pre_upgrade() {
    pre_remove ${2%%-*}
}

post_upgrade() {
    post_install ${1%%-*}
}

pre_remove() {
    echo 'DKMS remove...'
    dkms remove evdi/${1%%-*} --all
}