# arg 1:  the new package version
post_install() {

  # Make sure the group and user "dovecot"+"dovenull exists on this system and have the correct values

  # dovecot
  if grep -q "^dovecot:" /etc/group &> /dev/null ; then
    groupmod -g 76 -n dovecot dovecot &> /dev/null
  else
    groupadd -g 76 dovecot &> /dev/null
  fi

  if grep -q "^dovecot:" /etc/passwd 2> /dev/null ; then
    usermod -s /sbin/nologin -c "Dovecot user" -d /var/empty -u 76 -g dovecot dovecot &> /dev/null
  else
    useradd -s /sbin/nologin -c "Dovecot user" -d /var/empty -u 76 -g dovecot -r dovecot &> /dev/null
  fi 

  # dovenull
  if grep -q "^dovenull:" /etc/group &> /dev/null ; then
    groupmod -g 74 -n dovenull dovenull &> /dev/null
  else
    groupadd -g 74 dovenull &> /dev/null
  fi

  if grep -q "^dovenull:" /etc/passwd 2> /dev/null ; then
    usermod -s /sbin/nologin -c "Dovecot user for completely untrustworthy processes" -d /var/empty -u 74 -g dovenull dovenull &> /dev/null
  else
    useradd -s /sbin/nologin -c "Dovecot user for completely untrustworthy processes" -d /var/empty -u 74 -g dovenull -r dovenull &> /dev/null
  fi 
}

# arg 1:  the new package version
# arg 2:  the old package version
post_upgrade() {
      if [ "`vercmp $2 2.0.0`" -lt 0 ]; then
        # important upgrade notice
        echo "> IMPORTANT DOVECOT 2.0 UPGRADE NOTICE"
        echo "> ------------------------------------"
        echo "> see http://wiki2.dovecot.org/Upgrading/2.0"
	echo "> make sure, you convert the dovecot.conf file"
      fi
      if [ "`vercmp $2 2.0.13-2`" -lt 0 ]; then
        # to remove no more existant usersdirs simply remove the dovecot users and let them recreate later
        userdel dovecot &> /dev/null
        userdel dovenull &> /dev/null
      fi
    post_install $1
}

# arg 1:  the old package version
pre_remove() {
    userdel dovecot &> /dev/null
    userdel dovenull &> /dev/null
    groupdel dovecot &> /dev/null || /bin/true
    groupdel dovenull &> /dev/null || /bin/true
    rm -rf /var/run/dovecot/ &> /dev/null || /bin/true
}