Re: [PATCH] Create floppy emulation boot CD with grub-mkimage

[Christian Franke <Christian.Franke@t-online.de>]

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Robert Millan wrote:
> On Fri, Feb 15, 2008 at 11:32:49PM +0100, Christian Franke wrote:
>   
> ...
>   
>> The patch also adds a --joliet option, useful to access the long file 
>> names on Windows (which has no RR support).
>>     
>
> Is there any drawback in using --joliet ?  If not, I think it's better to do
> it by default to avoid "option creep".
>
>   

Here a new version of the patch with Joliet enabled always. Should not 
break anything.

Christian

2008-03-01  Christian Franke  <franke@computer.org>

	* util/i386/pc/grub-mkrescue.in: Add --emulation=floppy
	to create a floppy emulation boot CD when non emulation mode
	does not work.
	Enable Joliet CD filesystem extension.



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--- grub2.orig/util/i386/pc/grub-mkrescue.in	2008-02-09 14:02:56.057039500 +0100
+++ grub2/util/i386/pc/grub-mkrescue.in	2008-03-01 21:52:23.493466900 +0100
@@ -46,6 +46,7 @@
   --pkglibdir=DIR         use images from directory DIR instead of ${pkglibdir}
   --grub-mkimage=FILE     use FILE as grub-mkimage
   --image-type=TYPE       select floppy or cdrom (default)
+  --emulation=TYPE        select boot emulation type floppy or none (default)
 
 grub-mkimage generates a bootable rescue image of the specified type.
 
@@ -56,6 +57,7 @@
 image_type=cdrom
 input_dir=${pkglibdir}
 grub_mkimage=grub-mkimage
+emulation=none
 
 # Check the arguments.
 for option in "$@"; do
@@ -82,6 +84,14 @@
             echo "Unknown image type \`$image_type'" 1>&2
             exit 1 ;;
         esac ;;
+    --emulation=*)
+    	emulation=`echo "$option" | sed 's/--emulation=//'`
+        case "$emulation" in
+          floppy|none) ;;
+          *)
+            echo "Unknown emulation type \`$emulation'" 1>&2
+            exit 1 ;;
+        esac ;;
     -*)
 	echo "Unrecognized option \`$option'" 1>&2
 	usage
@@ -113,7 +123,7 @@
   cp -dpR ${overlay}/* ${aux_dir}/
 fi
 
-if [ "x${image_type}" = "xfloppy" ] ; then
+if [ "x${image_type}" = xfloppy -o "x${emulation}" = xfloppy ] ; then
   # build memdisk
   memdisk_img=`mktemp`
   tar -C ${aux_dir} -cf ${memdisk_img} boot
@@ -125,8 +135,21 @@
   rm -f ${memdisk_img}
 
   # build floppy image
-  cat ${input_dir}/boot.img ${core_img} /dev/zero | dd bs=1024 count=1440 > $output_image
+  if [ "x${image_type}" = xcdrom ] ; then
+    floppy_dir=`mktemp -d`
+    floppy_img=${floppy_dir}/grub_floppy.img
+  else
+    floppy_img=${output_image}
+  fi
+  cat ${input_dir}/boot.img ${core_img} /dev/zero | dd bs=1024 count=1440 > ${floppy_img}
   rm -f ${core_img}
+
+  if [ "x${image_type}" = xcdrom ] ; then
+    # build iso image
+    genisoimage -b grub_floppy.img \
+      -o ${output_image} -r -J ${floppy_dir}
+    rm -rf ${floppy_dir}
+  fi
 else
   # build core.img
   core_img=`mktemp`
@@ -139,7 +162,7 @@
   # build iso image
   genisoimage -b boot/grub/grub_eltorito \
     -no-emul-boot -boot-load-size 4 -boot-info-table \
-    -o ${output_image} -r ${aux_dir}
+    -o ${output_image} -r -J ${aux_dir}
   rm -rf ${aux_dir}
 fi