proper support for "isabelle update -D DIR": avoid accidental exclusion of select_dirs (amending e5dafe9e120f);
#!/usr/bin/env bash
set -e
$ISABELLE_LUALATEX root
$ISABELLE_BIBTEX root
$ISABELLE_LUALATEX root
$ISABELLE_LUALATEX root
./isa-index root
$ISABELLE_LUALATEX root