Robert Millan wrote:
On Sun, Feb 10, 2008 at 02:43:40PM +0100, Christian Franke wrote:
This results in 6 possible image variants:
1. Floppy: --image-type=floppy
2. CD, no emulation: --image-type=cdrom [--emulation=none]
3. CD, floppy emulation: --image-type=cdrom --emulation=floppy
4. CD, hdd emulation: --image-type=cdrom --emulation=hdd
5. USB without partitions: --image-type=superfloppy
6. USB with partitions: --image-type=hdd
It may be possible to use the image #1 as image #5.
I don't think it is really practical to support USB drives in grub-mkrescue.
You'd have to require root permissions, which IMO beats the point of having
a separate script from grub-install in first place.
It may be useful to create small rescue images which can be later put on
USB key with dd.
(BTW: The "floppy" image actually boots from USB at least on one of my
PC. It appears as hd0).
Here a new patch, it uses the --emulation=floppy syntax from above.
My recent tests (see "[PATCH] Ensure boot CD can be accessed") show that
direct CD boot might always not work.
The patch also adds a --joliet option, useful to access the long file
names on Windows (which has no RR support).
Christian
2008-02-15 Christian Franke <[EMAIL PROTECTED]>
* util/i386/pc/grub-mkrescue.in: Add --emulation=floppy
to create a floppy emulation boot CD when non emulation mode
does not work.
Add --joliet to enable Joliet cdrom filesystem extension.
--- grub2.orig/util/i386/pc/grub-mkrescue.in 2008-02-09 14:02:56.057039500 +0100
+++ grub2/util/i386/pc/grub-mkrescue.in 2008-02-15 23:09:26.843750000 +0100
@@ -46,6 +46,8 @@ Make GRUB rescue image.
--pkglibdir=DIR use images from directory DIR instead of ${pkglibdir}
--grub-mkimage=FILE use FILE as grub-mkimage
--image-type=TYPE select floppy or cdrom (default)
+ --emulation=TYPE select boot emulation type floppy, or none (default)
+ --joliet enable Joliet filesystem extension (cdrom only)
grub-mkimage generates a bootable rescue image of the specified type.
@@ -56,6 +58,8 @@ EOF
image_type=cdrom
input_dir=${pkglibdir}
grub_mkimage=grub-mkimage
+emulation=none
+joliet=
# Check the arguments.
for option in "$@"; do
@@ -82,6 +86,16 @@ for option in "$@"; do
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 ;;
+ --joliet)
+ joliet="-J" ;;
-*)
echo "Unrecognized option \`$option'" 1>&2
usage
@@ -113,7 +127,7 @@ if test "x$overlay" = x ; then : ; else
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 ${memdisk_img} boot
@@ -125,8 +139,21 @@ if [ "x${image_type}" = "xfloppy" ] ; th
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 ${joliet} ${floppy_dir}
+ rm -rf ${floppy_dir}
+ fi
else
# build core.img
core_img=`mktemp`
@@ -139,7 +166,7 @@ else
# 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 ${joliet} ${aux_dir}
rm -rf ${aux_dir}
fi
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