petget ln#93-92, download if required

#download if required... #Ln 72 to 92 of /usr/sbin/petget (tahrpup) - https://www.pearltrees.com/s243a/source-petget-usr-sbin/id20395775/item224036322

PKGNAME=""
DOWNLOADED=""
if [ "`echo -n "$PASSEDPARAM" | grep -E '^ftp|^http'`" != "" ];then
 cd /root
 #101116 use download_file utility...
 download_file "$PASSEDPARAM"
 PKGPATH="`dirname "$PASSEDPARAM"`" #really a url.
 FULLPKGNAME="`basename "$PASSEDPARAM"`"
 PKGMAIN="`basename "$PASSEDPARAM" ${EXT}`"
 if [ ! -f "$FULLPKGNAME" ];then
  if [ "$DISPLAY"  ]; then
   /usr/lib/gtkdialog/box_ok "$(gettext 'Puppy package manager')" error "$(gettext 'Sorry, failed to download') $FULLPKGNAME"
   exit
  else
   dialog --msgbox "$(gettext 'Sorry, failed to download') $FULLPKGNAME" 0 0
   exit
  fi
 fi
 DOWNLOADED="yes"