Adding files to the hddimg

Adding files to the hddimg

[Francois P. Gallichand]

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Hello,

I'm relatively new to yocto and this is maybe something that is pretty basic but how can I add my own files in the bootimg (.hddimg) using a custom recipes? And I really means the boot image file, not the rootfs image.

Thanks,

François Gallichand
Engineer - Software Group
ABB Group
Analytical Business
(418)877-2944 x268

[ABB logo]


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Re: Adding files to the hddimg

[Francois P. Gallichand]

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Hello All,

I realized that I may not have been specific enough on my problem since I haven't had any reply or found a solution yet.

Essentially, I need to be able to add some files to the image file itself (.hddimg, not the rootfs) and be able to do that automatically (and ideally from a custom recipe).

What I have tried so far is to extend the bootimg.bbclass. So I created my own class, myclass.bbclass, with the following content:

Inherit bootimg

myclass_do_bootimg() {
                do_bootimg
                cp <some files> ${HDDDIR}
}

EXPORT_FUNCTIONS do_bootimg

And I patched image-live.bbclass to replace the "inherit bootimg" by "inherit myclass" (I don't know if there is a better way to do that?). But it seems that myclass_do_bootimg is never called, but do_bootimg is.

I also tried the following myclass.bbclass without any more success.

Inherit bootimg

do_some_function() {
                cp <some files> ${HDDDIR}
}

addtask some_function after do_booimg

Can someone tell me what I'm doing wrong?

Thanks for any help.

Francois

François Gallichand
Engineer - Software Group
ABB Group
Analytical Business
(418)877-2944 x268

[ABB logo]

From: yocto-bounces@yoctoproject.org [mailto:yocto-bounces@yoctoproject.org] On Behalf Of Francois P Gallichand
Sent: Friday, June 13, 2014 9:58 AM
To: yocto@yoctoproject.org
Subject: [yocto] Adding files to the hddimg

Hello,

I'm relatively new to yocto and this is maybe something that is pretty basic but how can I add my own files in the bootimg (.hddimg) using a custom recipes? And I really means the boot image file, not the rootfs image.

Thanks,

François Gallichand
Engineer - Software Group
ABB Group
Analytical Business
(418)877-2944 x268

[ABB logo]


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Re: Adding files to the hddimg

[Paul Eggleton]

Hi Francois,

On Wednesday 18 June 2014 15:42:08 Francois P. Gallichand wrote:
> I realized that I may not have been specific enough on my problem since I
> haven't had any reply or found a solution yet.
> 
> Essentially, I need to be able to add some files to the image file itself
> (.hddimg, not the rootfs) and be able to do that automatically (and ideally
> from a custom recipe).
> 
> What I have tried so far is to extend the bootimg.bbclass. So I created my
> own class, myclass.bbclass, with the following content:
> 
> Inherit bootimg
> 
> myclass_do_bootimg() {
>                 do_bootimg
>                 cp <some files> ${HDDDIR}
> }
> 
> EXPORT_FUNCTIONS do_bootimg
> 
> And I patched image-live.bbclass to replace the "inherit bootimg" by
> "inherit myclass" (I don't know if there is a better way to do that?). But
> it seems that myclass_do_bootimg is never called, but do_bootimg is.
> 
> I also tried the following myclass.bbclass without any more success.
> 
> Inherit bootimg
> 
> do_some_function() {
>                 cp <some files> ${HDDDIR}
> }
> 
> addtask some_function after do_booimg
> 
> Can someone tell me what I'm doing wrong?

I might be wrong here but it seems to me that what you want to modify is the 
initramfs - is that right? In which case, that is constructed from an image 
recipe pointed to by INITRD_IMAGE - by default this is core-image-minimal-
initramfs, but you can point to your own modified image by setting INITRD_IMAGE 
within the image recipe (or at the configuration level).

Cheers,
Paul

-- 

Paul Eggleton
Intel Open Source Technology Centre

Re: Adding files to the hddimg

[Francois P. Gallichand]

Hello Paul,

Thanks for the reply. But that's not really what I want to achieve. Really, I just want to copy some files into the .hddimg file that is built as a result of running bitbake. Like I said, I tried to extend the bootimg.bbclass, which is responsible for creating the .hddimg file, but it's not working and I don't know why.

Any suggestions?

Regards,
Francois

François Gallichand
Engineer - Software Group
ABB Group
Analytical Business
(418)877-2944 x268



-----Original Message-----
From: Paul Eggleton [mailto:paul.eggleton@linux.intel.com] 
Sent: Wednesday, June 18, 2014 12:43 PM
To: Francois P. Gallichand
Cc: yocto@yoctoproject.org
Subject: Re: [yocto] Adding files to the hddimg

Hi Francois,

On Wednesday 18 June 2014 15:42:08 Francois P. Gallichand wrote:
> I realized that I may not have been specific enough on my problem 
> since I haven't had any reply or found a solution yet.
> 
> Essentially, I need to be able to add some files to the image file 
> itself (.hddimg, not the rootfs) and be able to do that automatically 
> (and ideally from a custom recipe).
> 
> What I have tried so far is to extend the bootimg.bbclass. So I 
> created my own class, myclass.bbclass, with the following content:
> 
> Inherit bootimg
> 
> myclass_do_bootimg() {
>                 do_bootimg
>                 cp <some files> ${HDDDIR} }
> 
> EXPORT_FUNCTIONS do_bootimg
> 
> And I patched image-live.bbclass to replace the "inherit bootimg" by 
> "inherit myclass" (I don't know if there is a better way to do that?). 
> But it seems that myclass_do_bootimg is never called, but do_bootimg is.
> 
> I also tried the following myclass.bbclass without any more success.
> 
> Inherit bootimg
> 
> do_some_function() {
>                 cp <some files> ${HDDDIR} }
> 
> addtask some_function after do_booimg
> 
> Can someone tell me what I'm doing wrong?

I might be wrong here but it seems to me that what you want to modify is the initramfs - is that right? In which case, that is constructed from an image recipe pointed to by INITRD_IMAGE - by default this is core-image-minimal- initramfs, but you can point to your own modified image by setting INITRD_IMAGE within the image recipe (or at the configuration level).

Cheers,
Paul

-- 

Paul Eggleton
Intel Open Source Technology Centre

Re: Adding files to the hddimg

[Anders Darander]

* Francois P. Gallichand <francois.p.gallichand@ca.abb.com> [140618 19:22]:

> Thanks for the reply. But that's not really what I want to achieve.
> Really, I just want to copy some files into the .hddimg file that is
> built as a result of running bitbake. Like I said, I tried to extend
> the bootimg.bbclass, which is responsible for creating the .hddimg
> file, but it's not working and I don't know why.

Well, then I guess the question if what kinds of file is it, and how do
you want to copy them into the .hddimg?

Should they be copied into the rootfs in the .hddimg? If so, I'd suggest
to create a standard bitbake recipe and just install those files into
the rootfs. 

If it's something else, I think you need to explain it a little bit
more. 

Cheers,
Anders

> Any suggestions?
-- 
Anders Darander
ChargeStorm AB / eStorm AB

Re: Adding files to the hddimg

[Francois P. Gallichand]

Hello Anders,

I don't want to copy files into the rootfs, I know how to do that. It's really in the hddimg that I need to copy files, at the same level as the rootfs.

To make a short story, here's what I want to do. I want to use a usb drive to install a system so I "dd" the hddimg to this usb drive. The idea is to boot this usb drive on the target system so it can be used to accomplish various task, like installing a new system or updating or configuring an existing one. So to do that, I need to put the required files to install or configure the system also on the key. You could argue that I can still do all of this even if I put everything in the rootfs. However, I use squashfs for the rootfs (to save space), and also the files on the key must be modifiable by a user using a Windows computer (which is easy since this is a VFAT partition but not the rootfs that's not even writable).

Like I mentionned in previous email, one way to achieve that is to extend the bootimg.bbclass, but I tried that and it didn't work (and I don't know why). After talking to some people, I guess that the simple solution is to write a separate script that does what I need i.e.once I build the hddimg, it just mount the hddimg and copy the required stuff on it. It's just that I would have liked to do that in the Yocto environment, but it's no big priority.

The resulting real question however is how to extend a .bbclass and why what I tried before didn't work?

Any idea about that?

Regards,
Francois

________________________________________
De : Anders Darander <anders@chargestorm.se>
Envoyé : 23 juin 2014 08:26
À : Francois P. Gallichand
Cc : Paul Eggleton; yocto@yoctoproject.org
Objet : Re: [yocto] Adding files to the hddimg

* Francois P. Gallichand <francois.p.gallichand@ca.abb.com> [140618 19:22]:

> Thanks for the reply. But that's not really what I want to achieve.
> Really, I just want to copy some files into the .hddimg file that is
> built as a result of running bitbake. Like I said, I tried to extend
> the bootimg.bbclass, which is responsible for creating the .hddimg
> file, but it's not working and I don't know why.

Well, then I guess the question if what kinds of file is it, and how do
you want to copy them into the .hddimg?

Should they be copied into the rootfs in the .hddimg? If so, I'd suggest
to create a standard bitbake recipe and just install those files into
the rootfs.

If it's something else, I think you need to explain it a little bit
more.

Cheers,
Anders

> Any suggestions?
--
Anders Darander
ChargeStorm AB / eStorm AB