grub disk-image builder.

grub disk-image builder.

[Franklin PIAT]

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Hello,

For my personal needs, i've written a script to build floppy or
hard-disk images.

It's very similar to mkgrub-rescue.sh (and slightly based on it),
except the images are formatted. Therefore it's possible to put
a grub.cfg and splash images on it.

I'm providing it here for anyone interested.

I could improve it you find some interest in it. (or feel free to 
fork or adopt it, if you want... it's GPL).

Franklin


[-- Attachment #2: mkgrub-diskimg.sh --]
[-- Type: application/x-shellscript, Size: 5778 bytes --]

Re: grub disk-image builder.

[Robert Millan]

On Wed, Jan 23, 2008 at 10:33:24PM +0100, Franklin PIAT wrote:
> Hello,
> 
> For my personal needs, i've written a script to build floppy or
> hard-disk images.
> 
> It's very similar to mkgrub-rescue.sh (and slightly based on it),
> except the images are formatted. Therefore it's possible to put
> a grub.cfg and splash images on it.

It's already possible to put arbitrary files in grub-mkrescue.  Is that
what you needed?

If you find that something is missing in grub-mkrescue, I think it's better
to get it integrated in the same script rather than providing a collection
of utilities.

grub-mkrescue is only aimed at creating floppies (or CD images, although
we don't support that too well yet).  For disks or disk-like media, grub-install
should work.  Did you find any drawback or limitation in that method?  It's
very useful for us that you tell us, since we can't think of every possible
use case.

-- 
Robert Millan

<GPLv2> I know my rights; I want my phone call!
<DRM> What use is a phone call… if you are unable to speak?
(as seen on /.)

Re: grub disk-image builder.

[Franklin PIAT]

[-- Attachment #1: Type: text/plain, Size: 1670 bytes --]

On Wed, 2008-01-23 at 23:26 +0100, Robert Millan wrote:
> On Wed, Jan 23, 2008 at 10:33:24PM +0100, Franklin PIAT wrote:
> > Hello,
> > 
> > For my personal needs, i've written a script to build floppy or
> > hard-disk images.
> > 
> > It's very similar to mkgrub-rescue.sh (and slightly based on it),
> > except the images are formatted. Therefore it's possible to put
> > a grub.cfg and splash images on it.
> 
> It's already possible to put arbitrary files in grub-mkrescue.  Is that
> what you needed?
> 
> If you find that something is missing in grub-mkrescue, I think it's better
> to get it integrated in the same script rather than providing a collection
> of utilities.
I've just had a look at yesterday's commit, which introduces --overlay.
great ! (Debian's Unstable is a few day behind cvs)

Since I wanted to test splashscreen, I needed to put unicode.pff
(1480KiB) + a tga image (1200KiB uncompressed)... That's why i came up
with hard disk images.

But now, with RLE'd TGA, JPEG and PNG, 2.88MiB floppy should do in most
case (I haven't tested it).

I've attached a patch for "--image-size" option. (it's GPL)

The one feature that one could miss, is the ability to mount and modify
the image, to easily customize rescue's grub.cfg, from a random
Operating system that understand fat. -- I don't need that feature.

Franklin

> grub-mkrescue is only aimed at creating floppies (or CD images, although
> we don't support that too well yet).  For disks or disk-like media, grub-install
> should work.  Did you find any drawback or limitation in that method?  It's
> very useful for us that you tell us, since we can't think of every possible
> use case.



[-- Attachment #2: grub.diff --]
[-- Type: text/x-patch, Size: 1464 bytes --]

--- grub-mkrescue.in?revision=1.5-orig	2008-01-24 01:01:13.000000000 +0100
+++ grub-mkrescue.in?revision=1.5	2008-01-24 01:08:35.000000000 +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)
+  --image-size=1440       size of the image size (720, 1440 or 2880 KiB).
 
 grub-mkimage generates a bootable rescue image of the specified type.
 
@@ -54,6 +55,7 @@
 }
 
 image_type=cdrom
+image_size=1440
 input_dir=${pkglibdir}
 grub_mkimage=grub-mkimage
 
@@ -82,6 +84,14 @@
             echo "Unknown image type \`$image_type'" 1>&2
             exit 1 ;;
         esac ;;
+    --image-size=*)
+    	image_size=`echo "$option" | sed 's/--image-size=//'`
+        case "$image_size" in
+          720|1440|2880) ;;
+          *)
+            echo "Invalid image size \`$image_size'" 1>&2
+            exit 1 ;;
+        esac ;;
     -*)
 	echo "Unrecognized option \`$option'" 1>&2
 	usage
@@ -125,7 +135,7 @@
 core_img=`mktemp`
 ${grub_mkimage} -d ${input_dir}/ -m ${memdisk_img} -o ${core_img} memdisk cpio biosdisk ${modules}
 rm -f ${memdisk_img}
-cat ${input_dir}/boot.img ${core_img} /dev/zero | dd bs=1024 count=1440 > $floppy_image
+cat ${input_dir}/boot.img ${core_img} /dev/zero | dd bs=1024 count=${image_size} > $floppy_image
 rm -f ${core_img}
 
 if [ "x${image_type}" = "xfloppy" ] ; then

Re: grub disk-image builder.

[Marco Gerards]

Robert Millan <rmh@aybabtu.com> writes:

> On Wed, Jan 23, 2008 at 10:33:24PM +0100, Franklin PIAT wrote:
>> Hello,
>> 
>> For my personal needs, i've written a script to build floppy or
>> hard-disk images.
>> 
>> It's very similar to mkgrub-rescue.sh (and slightly based on it),
>> except the images are formatted. Therefore it's possible to put
>> a grub.cfg and splash images on it.
>
> It's already possible to put arbitrary files in grub-mkrescue.  Is that
> what you needed?
>
> If you find that something is missing in grub-mkrescue, I think it's better
> to get it integrated in the same script rather than providing a collection
> of utilities.
>
> grub-mkrescue is only aimed at creating floppies (or CD images, although
> we don't support that too well yet).  For disks or disk-like media, grub-install
> should work.  Did you find any drawback or limitation in that method?  It's
> very useful for us that you tell us, since we can't think of every possible
> use case.

It would be useful, for testing, if grub-mkrescue can make a floppy/hd
image with a filesystem on it.  IIRC it can't make hd images yet,
right?

--
Marco

Re: grub disk-image builder.

[Robert Millan]

On Thu, Jan 24, 2008 at 01:21:18AM +0100, Franklin PIAT wrote:
> I've just had a look at yesterday's commit, which introduces --overlay.
> great ! (Debian's Unstable is a few day behind cvs)
> 
> Since I wanted to test splashscreen, I needed to put unicode.pff
> (1480KiB) + a tga image (1200KiB uncompressed)... That's why i came up
> with hard disk images.
> 
> But now, with RLE'd TGA, JPEG and PNG, 2.88MiB floppy should do in most
> case (I haven't tested it).

Unfrotunately it can't use more than ~600 kiB without overwriting the vga
region (and others), so this is prevented in grub-mkimage.

This limitation can be resolved by putting the filesystem at the beginning
of the device, and moving our code out of the way, just like we do for normal
boot from hard disk.

You should be able to do this with grub-install (either on floppy or bigger
devices).  Does this work for you?

-- 
Robert Millan

<GPLv2> I know my rights; I want my phone call!
<DRM> What use is a phone call… if you are unable to speak?
(as seen on /.)