#!/bin/sh
# See deb-prerm(5).

set -e

: "${DPKG_ADMINDIR:=/var/lib/dpkg}"

# Rename state directories to match renamed method names.
rename_method_state_dir() {
  methodoldname="$1"
  methodoldopt="$2"
  methodnewname="$3"
  methodnewopt="$4"
  methodsdir="$DPKG_ADMINDIR/methods"

  if [ -d "$methodsdir/$methodoldname" ]; then
    if [ -e "$methodsdir/$methodnewname" ]; then
      rm -rf "$methodsdir/$methodoldname"
    else
      if [ -e "$methodsdir/$methodoldname/shvar.$methodoldopt" ]; then
        cp -a "$methodsdir/$methodoldname/shvar.$methodoldopt" \
              "$methodsdir/$methodoldname/shvar.$methodnewopt"
      fi
      mv "$methodsdir/$methodoldname" "$methodsdir/$methodnewname"
      rm -f "$methodsdir/$methodnewname/shvar.$methodoldopt"
    fi
    # Update the currently selected method and option if needed.
    sed -i -e "s/^$methodoldname $methodoldopt/$methodnewname $methodnewopt/" \
      "$DPKG_ADMINDIR/cmethopt"
  fi
}

case "$1" in
upgrade)
  if dpkg --compare-versions "$2" lt 1.21.3; then
    # Downgrade
    rename_method_state_dir file file disk mounted
    rename_method_state_dir media media multicd multi_cd
  fi
  ;;
deconfigure|remove|failed-upgrade)
  ;;
*)
  echo "$0 called with unknown argument '$1'" 1>&2
  exit 1
  ;;
esac

#DEBHELPER#

exit 0