post_install() {
    if [ -f "/etc/ld.so.preload" ]; then
        # Exist
        sed -i "s|^disable-fsync.so$|/usr/lib/disable-fsync.so|g" "/etc/ld.so.preload"
    else
        # No exist
        echo "/usr/lib/disable-fsync.so" > "/etc/ld.so.preload"
    fi
}

post_upgrade() {
        sed -i "s|^disable-fsync.so$|/usr/lib/disable-fsync.so|g" "/etc/ld.so.preload"
}

pre_remove() {
        sed -i "s|^disable-fsync.so$||g" "/etc/ld.so.preload"
}
