#!/bin/sh -e

#DEBHELPER#

# Remove the cache on remove or purge.
# Remove the jwhois group on purge.
# Remove statoverride on purge.

case "$1" in
  remove)
    rm -f /var/cache/jwhois/jwhois.db.db /var/cache/jwhois/jwhois.db
    rmdir /var/cache/jwhois 2> /dev/null || true
    ;;
  purge)
    rm -f /var/cache/jwhois/jwhois.db.db /var/cache/jwhois/jwhois.db
    rmdir /var/cache/jwhois 2> /dev/null || true
    # Need to remove statoverride because of incorrect usage in
    # 2.4.2-1 -- 2.4.2-3, which adds a statoverride with the jwhois
    # group. Dpkg does not like to have a leftover statoverride with
    # a non-existing group.
    jwhoisoverride=1
    dpkg-statoverride --list /usr/bin/jwhois > /dev/null || jwhoisoverride=0
    if test "$jwhoisoverride" = "1"; then
      dpkg-statoverride --remove /usr/bin/jwhois || echo "Failed removing statoverride for /usr/bin/jwhois"
    fi
    cacheoverride=1
    dpkg-statoverride --list /var/cache/jwhois > /dev/null || cacheoverride=0
    if test "$cacheoverride" = "1"; then
      dpkg-statoverride --remove /var/cache/jwhois || echo "Failed removing statoverride for /var/cache/jwhois"
    fi
    if getent group jwhois > /dev/null; then
      groupdel jwhois || echo "Failed removing group \`jwhois'"
    fi
    ;;
  upgrade)
    if dpkg --compare-versions "$2" ge 2.4.2-1; then
      # Breakage: <= 2.4.1 used jwhois.db.db, 2.4.2+ use jwhois.db
      # If old cache exists, and new does not, move it
      if test -e /var/cache/jwhois/jwhois.db.db -a ! -e /var/cache/jwhois/jwhois.db.db; then
        mv -f /var/cache/jwhois/jwhois.db.db /var/cache/jwhois/jwhois.db
      fi
      # Remove possible left-over old cache
      rm -f /var/cache/jwhois/jwhois.db.db
    else
      # We're downgrading, put cache back
      # If new cache exists, and old does not, move it
      if test -e /var/cache/jwhois/jwhois.db -a ! -e /var/cache/jwhois/jwhois.db.db; then
        mv -f /var/cache/jwhois/jwhois.db /var/cache/jwhois/jwhois.db.db
      fi
      # Remove possible left-over new cache
      rm -f /var/cache/jwhois/jwhois.db
    fi
    ;;
  *)
    echo "postrm called with unknown argument \`$1'" >&2
    exit 0
    ;;
esac