Add grub-mkrescue patch from Thomas Schmitt to allow reducing the size

of xorriso-created images.  Use this to ensure that
grub-rescue-floppy.img fits well within size limits (closes: #548320).

debian/changelog

@@ -27,6 +27,9 @@ grub2 (1.98+20100602-1) UNRELEASED; urgency=low
     installation media etc., without having to build-depend on grub-pc which
     isn't coinstallable with other platform variants and does invasive
     things in its postinst.
+  * Add grub-mkrescue patch from Thomas Schmitt to allow reducing the size
+    of xorriso-created images.  Use this to ensure that
+    grub-rescue-floppy.img fits well within size limits (closes: #548320).
 
  -- Colin Watson <cjwatson@debian.org>  Tue, 01 Jun 2010 15:54:54 +0100
 

debian/grub-rescue-pc.links

@@ -1,4 +1,3 @@
 # Truth would be uselessly confusing for users.  Let's give 'em what they
 # wanted instead.
 usr/lib/grub-rescue/grub-rescue-cdrom.iso	usr/lib/grub-rescue/grub-rescue-usb.img
-usr/lib/grub-rescue/grub-rescue-cdrom.iso	usr/lib/grub-rescue/grub-rescue-floppy.img

debian/patches/909_mkrescue_diet.diff

@@ -0,0 +1,58 @@
+Description: Allow reducing size of xorriso-created rescue images
+ This lets us create smaller images that will fit on floppy disks.  It has
+ been approved by the upstream maintainer but has not yet been applied.
+Author: Thomas Schmitt <scdbackup@gmx.net>
+Origin: other, http://lists.gnu.org/archive/html/grub-devel/2010-05/msg00100.html
+Forwarded: yes
+Last-Update: 2010-06-02
+
+Index: b/util/grub-mkrescue.in
+===================================================================
+--- a/util/grub-mkrescue.in
++++ b/util/grub-mkrescue.in
+@@ -40,6 +40,9 @@
+ override_dir=
+ grub_mkimage=${bindir}/`echo grub-mkimage | sed ${transform}`
+ 
++xorriso=xorriso
++diet=no
++
+ # Usage: usage
+ # Print the usage.
+ usage () {
+@@ -53,6 +56,8 @@
+   --modules=MODULES       pre-load specified modules MODULES
+   --rom-directory=DIR     save rom images in DIR [optional]
+   --grub-mkimage=FILE     use FILE as grub-mkimage
++  --xorriso=PROGFILE      use PROGFILE as xorriso program [optional]
++  --diet                  apply size reducing measures [optional]
+ 
+ $0 generates a bootable rescue image with specified source files or directories.
+ 
+@@ -83,6 +88,10 @@
+ 	;;
+     --grub-mkimage=*)
+ 	grub_mkimage=`echo "$option" | sed 's/--grub-mkimage=//'` ;;
++    --xorriso=*)
++	xorriso=`echo "${option}/" | sed 's/--xorriso=//'` ;;
++    --diet)
++	diet=yes ;;
+     -*)
+ 	echo "Unrecognized option \`$option'" 1>&2
+ 	usage
+@@ -267,7 +276,14 @@
+ fi
+ 
+ # build iso image
+-xorriso -pathspecs on -as mkisofs ${grub_mkisofs_arguments} --protective-msdos-label -o ${output_image} -r ${iso9660_dir} ${source}
++if [ "${diet}" = yes ]; then
++    if [ -e "${output_image}" ]; then
++        rm "${output_image}" || exit 1
++    fi
++    "${xorriso}" -report_about HINT -as mkisofs -graft-points -no-pad ${grub_mkisofs_arguments} --protective-msdos-label -r ${iso9660_dir} ${source} | cat >"${output_image}"
++else
++    "${xorriso}" -report_about HINT -as mkisofs -graft-points ${grub_mkisofs_arguments} --protective-msdos-label -o "${output_image}" -r ${iso9660_dir} ${source}
++fi
+ rm -rf ${iso9660_dir}
+ 
+ rm -f ${embed_img}

debian/patches/series

@@ -7,3 +7,4 @@
 904_disable_floppies.diff
 907_grub.cfg_400.diff
 908_gfxpayload_keep_default.diff
+909_mkrescue_diet.diff

debian/rules

@@ -114,12 +114,17 @@ build/stamps/build-grub-rescue-pc: build/stamps/build-grub-pc
 	mkdir -p build/grub-rescue-pc/lib/grub
 	rm -rf build/grub-rescue-pc/lib/grub/i386-pc
 	cp -a build/grub-pc build/grub-rescue-pc/lib/grub/i386-pc
-	# save space, especially for floppy image
-	rm -rf build/grub-rescue-pc/lib/grub/i386-pc/po
 	$(CURDIR)/build/grub-rescue-pc/grub-mkrescue \
 		--grub-mkimage=$(CURDIR)/build/grub-pc/grub-mkimage \
 		--output=$(CURDIR)/build/grub-rescue-pc/grub-rescue-cdrom.iso \
 		$(CURDIR)/build/grub-rescue-pc/rescue-disk
+	# save space for floppy image
+	rm -rf build/grub-rescue-pc/lib/grub/i386-pc/po
+	$(CURDIR)/build/grub-rescue-pc/grub-mkrescue \
+		--grub-mkimage=$(CURDIR)/build/grub-pc/grub-mkimage \
+		--output=$(CURDIR)/build/grub-rescue-pc/grub-rescue-floppy.img \
+		--diet \
+		$(CURDIR)/build/grub-rescue-pc/rescue-disk
 	touch $@
 
 install/grub-pc install/grub-efi-ia32 install/grub-efi-amd64 install/grub-ieee1275 install/grub-coreboot install/grub-emu install/grub-yeeloong::