[yocto] remove /boot/uImage and /usr/share/terminfo

[Hans Beckérus]

Hi. In an effort to shrink our rootfs by some major numbers we found two
low-hanging fruits that we would like to address before cherry picking and
removing lots of good linux functionality. We have no need for the uImage
(3MB) stored in /boot and also we can leave out the terminfo tree (2.5MB).
My question here now is if the build system provide functionality to
actually tell the image builder not to include these specific components?
Or do we need to write some post installer for our rootfs that mounts the
image, removes the files, and then umount it?
If we remove inclusion of any kernel modules it seems that /boot is never
populated? But we need the modules. Also, what package brings in terminfo?
Is it as simple as writing a .bbappend to remove it att deploy time?

Hans
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Re: [yocto] remove /boot/uImage and /usr/share/terminfo

[Bruce Ashfield]

On 13-03-15 06:33 AM, Hans Beckérus wrote:

Hi. In an effort to shrink our rootfs by some major numbers we found two
low-hanging fruits that we would like to address before cherry picking
and removing lots of good linux functionality. We have no need for the
uImage (3MB) stored in /boot and also we can leave out the terminfo tree
(2.5MB).
My question here now is if the build system provide functionality to
actually tell the image builder not to include these specific components?


From kernel.bbclass, you just need to clear RDEPENDS_kernel-base
in your .conf files:

# Allow machines to override this dependency if kernel image files are
# not wanted in images as standard
RDEPENDS_kernel-base ?= "kernel-image"

You'll still get your kernel modules installed after making this change.

Bruce


Or do we need to write some post installer for our rootfs that mounts
the image, removes the files, and then umount it?
If we remove inclusion of any kernel modules it seems that /boot is
never populated? But we need the modules. Also, what package brings in
terminfo?
Is it as simple as writing a .bbappend to remove it att deploy time?

Hans



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Re: [yocto] remove /boot/uImage and /usr/share/terminfo

[Hans Beckérus]

On Fri, Mar 15, 2013 at 3:20 PM, Bruce Ashfield <
bruce.ashfi...@windriver.com> wrote:

> On 13-03-15 06:33 AM, Hans Beckérus wrote:
>
>> Hi. In an effort to shrink our rootfs by some major numbers we found two
>> low-hanging fruits that we would like to address before cherry picking
>> and removing lots of good linux functionality. We have no need for the
>> uImage (3MB) stored in /boot and also we can leave out the terminfo tree
>> (2.5MB).
>> My question here now is if the build system provide functionality to
>> actually tell the image builder not to include these specific components?
>>
>
> From kernel.bbclass, you just need to clear RDEPENDS_kernel-base
> in your .conf files:
>
> # Allow machines to override this dependency if kernel image files are
> # not wanted in images as standard
> RDEPENDS_kernel-base ?= "kernel-image"
>
> You'll still get your kernel modules installed after making this change.
>
> Bruce
>

Thanks Bruce.How could I have missed that? I believe I scanned through the
kernel.bbclass for something like this.
Also got some good tip regarding /usr/share/terminfo? Guess I need to
figure out what package drags it in ;)

Hans
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Re: [yocto] remove /boot/uImage and /usr/share/terminfo

[Bruce Ashfield]

On 13-03-15 07:36 AM, Hans Beckérus wrote:



On Fri, Mar 15, 2013 at 3:20 PM, Bruce Ashfield
mailto:bruce.ashfi...@windriver.com>> wrote:

On 13-03-15 06:33 AM, Hans Beckérus wrote:

Hi. In an effort to shrink our rootfs by some major numbers we
found two
low-hanging fruits that we would like to address before cherry
picking
and removing lots of good linux functionality. We have no need
for the
uImage (3MB) stored in /boot and also we can leave out the
terminfo tree
(2.5MB).
My question here now is if the build system provide functionality to
actually tell the image builder not to include these specific
components?


 From kernel.bbclass, you just need to clear RDEPENDS_kernel-base
in your .conf files:

# Allow machines to override this dependency if kernel image files are
# not wanted in images as standard
RDEPENDS_kernel-base ?= "kernel-image"

You'll still get your kernel modules installed after making this change.

Bruce


Thanks Bruce.How could I have missed that? I believe I scanned through
the kernel.bbclass for something like this.
Also got some good tip regarding /usr/share/terminfo? Guess I need to
figure out what package drags it in ;)


Not off the top of my head. Hopefully someone else with experience in
that area will notice the traffic and jump in :)

I'm fairly certain that is is controllable, since in the past, I've
known it to be removed and tuned for small systems, so it's not a
completely uncommon thing to do.

Cheers,

Bruce



Hans



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Re: [yocto] remove /boot/uImage and /usr/share/terminfo

[Hans Beckérus]

On Fri, Mar 15, 2013 at 3:41 PM, Bruce Ashfield <
bruce.ashfi...@windriver.com> wrote:

> On 13-03-15 07:36 AM, Hans Beckérus wrote:
>
>>
>>
>> On Fri, Mar 15, 2013 at 3:20 PM, Bruce Ashfield
>> > >
>> wrote:
>>
>> On 13-03-15 06:33 AM, Hans Beckérus wrote:
>>
>> Hi. In an effort to shrink our rootfs by some major numbers we
>> found two
>> low-hanging fruits that we would like to address before cherry
>> picking
>> and removing lots of good linux functionality. We have no need
>> for the
>> uImage (3MB) stored in /boot and also we can leave out the
>> terminfo tree
>> (2.5MB).
>> My question here now is if the build system provide functionality
>> to
>> actually tell the image builder not to include these specific
>> components?
>>
>>
>>  From kernel.bbclass, you just need to clear RDEPENDS_kernel-base
>> in your .conf files:
>>
>> # Allow machines to override this dependency if kernel image files are
>> # not wanted in images as standard
>> RDEPENDS_kernel-base ?= "kernel-image"
>>
>> You'll still get your kernel modules installed after making this
>> change.
>>
>> Bruce
>>
>>
>> Thanks Bruce.How could I have missed that? I believe I scanned through
>> the kernel.bbclass for something like this.
>> Also got some good tip regarding /usr/share/terminfo? Guess I need to
>> figure out what package drags it in ;)
>>
>
> Not off the top of my head. Hopefully someone else with experience in
> that area will notice the traffic and jump in :)
>
> I'm fairly certain that is is controllable, since in the past, I've
> known it to be removed and tuned for small systems, so it's not a
> completely uncommon thing to do.
>
> Cheers,
>

But of course. It is ncurses that drags it in. That figures ;)
It can be disabled in the configure script
 --disable-database  do not use terminfo, only fallbacks/termcap
So all it should take is to create a .bbappend and update EXTRA_OECONF.
But I might be wrong of course. Might be an even easier solution.

Hans
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