customizing grub-mkrecue images

[Neal H. Walfield]

Hi,

grub-mkrescue is quite useful, however, I'd like to be able to
customize the image it creates a bit more than it currently supports.
In particular, I'd like to load another config file at boot time.  The
attached patch enables this by way of a new option, --configfile.

A more general solution to the customization problem would be to load
a config file at image compilation time.  This could be used to solve
my problem.  However, as it is an additional level of indirection,
perhaps both options would be useful.

Thoughts?

Thanks,
Neal

2009-01-17  Neal H. Walfield  <address@hidden>

        * util/i386/pc/grub-mkrescue.in: Add new option --configfile.  If
        not the set and not the empty string, load it from the generated
        config file on boot.

Index: util/i386/pc/grub-mkrescue.in
===================================================================
--- util/i386/pc/grub-mkrescue.in       (revision 1946)
+++ util/i386/pc/grub-mkrescue.in       (working copy)
@@ -49,6 +49,7 @@
   --image-type=TYPE       select floppy or cdrom (default)
   --emulation=TYPE        select El Torito boot emulation type floppy
                           or none (default) (cdrom only)
+  --configfile=FILE       config file to load (default: none)
 
 grub-mkimage generates a bootable rescue image of the specified type.
 
@@ -93,6 +94,9 @@
             echo "Unknown emulation type \`$emulation'" 1>&2
             exit 1 ;;
         esac ;;
+    --configfile=*)
+       configfile=`echo "$option" | sed 's/--configfile=//'`
+        ;;
     -*)
        echo "Unrecognized option \`$option'" 1>&2
        usage
@@ -121,9 +125,15 @@
   ${aux_dir}/boot/grub/
 
 modules="biosdisk `cat ${input_dir}/partmap.lst` ${modules}"
-for i in ${modules} ; do
-  echo "insmod $i"
-done > ${aux_dir}/boot/grub/grub.cfg
+{
+  for i in ${modules} ; do
+    echo "insmod $i"
+  done
+  if test x$configfile != x
+  then
+    echo "configfile $configfile"
+  fi
+} > ${aux_dir}/boot/grub/grub.cfg
 
 for d in ${overlay}; do
   echo "Overlaying $d"