#!/bin/sh

set -e

rm_if_matches_md5sum() {
    F="$1"
    M="$2"
    if [ -e "$F" ]; then
        md5=$(md5sum "$F" | cut -f 1 -d\ )
        if [ "$md5" = "$M" ]; then
	    rm "$F"
        fi
    fi
}


case "$1" in
  install|upgrade)
      # older versions did not ship 00-header/10-help-text as conffiles but
      # newer do, because the content changed this triggers a conffile prompt
      # now. by removing the file (if unmodified) we avoid this prompt and
      # dpkg will re-create it
      if dpkg --compare-versions "$2" le-nl "6.4ubuntu4"; then
          rm_if_matches_md5sum "/etc/update-motd.d/00-header" "4241925109d5d9fc869f20143dbd4054"
          rm_if_matches_md5sum "/etc/update-motd.d/10-help-text" "918a1e4bc361b759adff1fabbcd8fb8f"
      fi
  ;;
esac