[gentoo-dev] Genkernel hacking

[gentoo-dev] Genkernel hacking

[Robin H. Johnson]

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Hi Guys,

While wanting to build a bunch of kernels to test out in a mostly
automated fashion, I hacked up some improvements to genkernel for the
task.

I've put up the modified version here.
http://www.orbis-terrarum.net/~robbat2/genkernel

A diff against the current genkernel installed by the ebuild is almost
the size of the existing program, so I decided posting just the modified
program was probably more effective.

Change listing:
- Help page!
- Use getopt for option handling (all options now have long and short
  versions)
- Specify which kernel version you want to build
- Specify where to find the kernel sources to build (for those of us
  that build on ramdisks ;-)
- options to call packaging and bootsplash stuff (the base functionality
  was there before, but hidden).
- Fixed packaging code some to work better.
- "--skip-mrproper" to skip mrproper when you only want to make a few
  tweaks to the kernel and not rebuild all of it.

Example usage:
I have my custom modified kernel source for linux-2.4.22-ac4 in
/tmp/ramdisk/linux.custom
EXTRAVERSION in the makefile is -ac4+robbat2
To build it:
genkernel -d /tmp/ramdisk/linux.custom --kernel-version 2.4.22-ac4+robbat2
(I already have a customized config in /etc/kernels/config-2.4.22-ac4+robbat2)
now I forgot something and it doesn't build right
genkernel --kernel-directory /tmp/ramdisk/linux.custom -k 2.4.22-ac4+robbat2 --config
now to continue building:
genkernel -d /tmp/ramdisk/linux.custom -k 2.4.22-ac4+robbat2 -s

I haven't tested the bootsplash functionality, as some of that code
didn't make any sense. Appending to a raw initrd image and then not
compressing it???

Hopefully somebody will find these changes useful in the meantime.

-- 
Robin Hugh Johnson
E-Mail     : robbat2@orbis-terrarum.net
Home Page  : http://www.orbis-terrarum.net/?l=people.robbat2
ICQ#       : 30269588 or 41961639
GnuPG FP   : 11AC BA4F 4778 E3F6 E4ED  F38E B27B 944E 3488 4E85

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Re: [gentoo-dev] Genkernel hacking

[Chris Gianelloni]

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On Tue, 2003-09-30 at 04:31, Robin H. Johnson wrote:
> I haven't tested the bootsplash functionality, as some of that code
> didn't make any sense. Appending to a raw initrd image and then not
> compressing it???

Bootsplash works by appending a uncompressed JPG to the already
compressed initrd image.
-- 
Chris Gianelloni
Developer, Gentoo Linux
Games Team

Is your power animal a pengiun?

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Re: [gentoo-dev] Genkernel hacking

[Robin H. Johnson]

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Latest version of my modified genkernel released, with all the
modifications that were added to the mainstream 1.9 added to my modified
version as well.

I also suspect a bug in the bootsplash code of the mainstream 1.9, where
the bootsplash image is not added to the correct location (initrd
instead of initrd.gz).

On Tue, Sep 30, 2003 at 01:31:58AM -0700, Robin H. Johnson wrote:
> I've put up the modified version here.
> http://www.orbis-terrarum.net/~robbat2/genkernel
http://www.orbis-terrarum.net/%7Erobbat2/genkernel-1.9-robbat2

-- 
Robin Hugh Johnson
E-Mail     : robbat2@orbis-terrarum.net
Home Page  : http://www.orbis-terrarum.net/?l=people.robbat2
ICQ#       : 30269588 or 41961639
GnuPG FP   : 11AC BA4F 4778 E3F6 E4ED  F38E B27B 944E 3488 4E85

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Re: [gentoo-dev] Genkernel hacking

[Chris Gianelloni]

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On Thu, 2003-10-09 at 05:31, Robin H. Johnson wrote:
> Latest version of my modified genkernel released, with all the
> modifications that were added to the mainstream 1.9 added to my modified
> version as well.
> 
> I also suspect a bug in the bootsplash code of the mainstream 1.9, where
> the bootsplash image is not added to the correct location (initrd
> instead of initrd.gz).

Actually, the bootsplash image *must* be appended to the end of the
initrd uncompressed, so it has to go onto the initrd.gz not initrd.
> 
> On Tue, Sep 30, 2003 at 01:31:58AM -0700, Robin H. Johnson wrote:
> > I've put up the modified version here.
> > http://www.orbis-terrarum.net/~robbat2/genkernel
> http://www.orbis-terrarum.net/%7Erobbat2/genkernel-1.9-robbat2
-- 
Chris Gianelloni
Developer, Gentoo Linux
Games Team

Is your power animal a penguin?

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Re: [gentoo-dev] Genkernel hacking

[Robin H. Johnson]

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On Thu, Oct 09, 2003 at 06:07:23AM -0400, Chris Gianelloni wrote:
> > I also suspect a bug in the bootsplash code of the mainstream 1.9, where
> > the bootsplash image is not added to the correct location (initrd
> > instead of initrd.gz).
> Actually, the bootsplash image *must* be appended to the end of the
> initrd uncompressed, so it has to go onto the initrd.gz not initrd.

Thanks for that bit, althougth it still means there is a bug :-).

The bootsplash image is added to ${TEMP}/initrd with 
'cat ${BOOT_SPLASH_INITRD} >> ${TEMP}/initrd'

However, at that point, ${TEMP}/initrd doesn't exist anymore, because of
'gzip -f -9 ${TEMP}/initrd' that runs shortly before it, and the code
after adding bootsplash only references ${TEMP}/initrd.gz and not
${TEMP}/initrd ever again.

-- 
Robin Hugh Johnson
E-Mail     : robbat2@orbis-terrarum.net
Home Page  : http://www.orbis-terrarum.net/?l=people.robbat2
ICQ#       : 30269588 or 41961639
GnuPG FP   : 11AC BA4F 4778 E3F6 E4ED  F38E B27B 944E 3488 4E85

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Re: [gentoo-dev] Genkernel hacking

[Doug Weimer]

On Thu, 2003-10-09 at 07:17, Robin H. Johnson wrote:

> The bootsplash image is added to ${TEMP}/initrd with 
> 'cat ${BOOT_SPLASH_INITRD} >> ${TEMP}/initrd'
> 
> However, at that point, ${TEMP}/initrd doesn't exist anymore, because of
> 'gzip -f -9 ${TEMP}/initrd' that runs shortly before it, and the code
> after adding bootsplash only references ${TEMP}/initrd.gz and not
> ${TEMP}/initrd ever again.

It appears that the initrd image with the bootsplash isn't gzip'd at
all. Unless I'm miss reading the code, gzip is only ran if the
bootsplash isn't used:
(from genkernel-1.8)
if [ $BOOTSPLASH = "yes" ]
        then
        ebegin "Adding Bootsplash Initrd"
        cat ${BOOT_SPLASH_INITRD} >> ${TEMP}/initrd || die
        cp -f ${TEMP}/initrd /boot/initrd-${KV}
        eend
        else
        gzip -f -9 ${TEMP}/initrd
        mv -f ${TEMP}/initrd.gz /boot/initrd-${KV}
        eend
fi

Notice the else before 'gzip ...', either way the result ends up in
initrd-${KV} which is used in buildpkg().

Doug


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Re: [gentoo-dev] Genkernel hacking

[Bob Johnson]

Look at version 1.9

On Thursday 09 October 2003 04:34 pm, Doug Weimer wrote:
>         mv -f ${TEMP}/initrd.gz /boot/initrd-${KV}
>         eend
> fi
>
> Notice the else before 'gzip ...', either way the result ends up in
> initrd-${KV} which is used in buildpkg().
>
> Doug
>
>
> --
> gentoo-dev@gentoo.org mailing list


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Re: [gentoo-dev] Genkernel hacking

[Bob Johnson]

Fixed locally.

	cat ${BOOT_SPLASH_INITRD} >> ${TEMP}/initrd.gz || die
		
					Bob

>
> Thanks for that bit, althougth it still means there is a bug :-).
>
> The bootsplash image is added to ${TEMP}/initrd with
> 'cat ${BOOT_SPLASH_INITRD} >> ${TEMP}/initrd'
>
> However, at that point, ${TEMP}/initrd doesn't exist anymore, because of
> 'gzip -f -9 ${TEMP}/initrd' that runs shortly before it, and the code
> after adding bootsplash only references ${TEMP}/initrd.gz and not
> ${TEMP}/initrd ever again.


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