#!/bin/sh

set -e

mv_conffile() {
  local package='alsa-base'
  local name="$1"
  local newname="$2"

  [ -e "$name" ] || return 0

  local md5="$(md5sum $name | sed -e 's/ .*//')"
  oldmd5="$(dpkg-query -W -f='${Conffiles}' $package | \
    sed -n -e "\' $name ' { s/ obsolete$//; s/.* //; p }")"

  if [ "$md5" = "$oldmd5" ]; then
    rm -f "$name"
  else
    mv "$name" "$newname"
  fi
}

rm_conffile() {
  mv_conffile "$1" "$1.dpkg-bak"
}

case "$1" in
  install|upgrade)
	# The following must be deleted at preinst time
	# so that dpkg can remove their parent directories
	# Delete obsolete dev.d symlinks
	for N in 0 1 2 3 4 5 6 7 ; do
		D="/etc/dev.d/snd/controlC$N"
		if [ -d "$D" ] ; then
			L="$D/alsa-base.dev"
			rm -f "$L"
		fi
	done
	# Delete obsolete dev.d script
	rm_conffile /etc/alsa/dev.d/alsa-base
	# Delete obsolete init script
	rm_conffile /etc/init.d/alsa
	# Delete blacklist without .conf extension
	rm_conffile /etc/modprobe.d/blacklist-alsa
	rm_conffile /etc/modprobe.d/blacklist-oss
        # Rename alsa-base
        if dpkg --compare-versions "$2" lt "1.0.23+dfsg-1ubuntu4"; then
            rm_conffile /etc/modprobe.d/alsa-base
            rm_conffile /etc/modprobe.d/blacklist-modem
        fi
	;;
esac