[yocto] How to use different busybox defconfig's in the initramfs and rootfs image

[Erwin.Rieger.ext at rohde-schwarz.com]

Hello,

thank you for your reply.

I have a working solution now, but it is not as clean as i would like it to be and some new questions arose with it.

My current setup consists of a busybox.bbappend file that is used to customize the rootfs
busybox (defconfig, some /etc files and so on) and a busybox-initramfs.bb recipe for the initramfs busybox (as you
suggested).

The busybox.bbappend (see below) is straight forward, so no problem with that.

To create the busybox-initramfs.bb in my custom layer, i have included the base busybox recipe from the meta layer with
an 'require' statement.

Then i had to extend the FILESEXTRAPATHS variable to point back to the base recipe files-directory since it
no longer found the SRC_URI files from meta/busybox.bb and meta/busybox.inc. See the BUSYBOXBASEDIR
variable in the busybox-initramfs.bb below.

I feel that his construct is not that elegant, so here comes the first question:

Is there a nicer/cleaner way to include/reference the source files from the base busybox recipe in the meta layer?

The second question concerns the versioning: The busybox.bbappend file uses a 'version wildcard' (_%) to
match all versions of the base busybox recipe. But in the busybox-initramfs.bb recipe i have to hardwire the 
version of the base recipe.

How can i use a 'version wildcard' in a 'require' statement?

I've tried 'require recipes-core/busybox/busybox_%.bb' but that gives me a parse error so it seems not to be
possible to use version wildcards together with require/include.


My current busybox-initramfs.bb recipe:
-------------------------------------------------------------------
DESCRIPTION = "Use different busybox defconfig for initramfs."

# require recipes-core/busybox/busybox_1.22.1.bb

PV = "1.22.1"
require recipes-core/busybox/busybox_${PV}.bb

S = "${WORKDIR}/busybox-${PV}"

# Point FILESPATH to base busybox files dir
BUSYBOXBASEDIR = "${THISDIR}/../../../meta/recipes-core/busybox"
FILESEXTRAPATHS_prepend := "${BUSYBOXBASEDIR}/busybox:"
FILESEXTRAPATHS_prepend := "${BUSYBOXBASEDIR}/files:"

# Include our initramfs busybox defconfig
FILESEXTRAPATHS_prepend := "${THISDIR}/${BPN}:"

BUSYBOX_SPLIT_SUID = "0"
-------------------------------------------------------------------


The busybox_%.bbappend for the rootfs busybox:
-------------------------------------------------------------------
DESCRIPTION = "Customize busybox."

# Include our rootfs busybox defconfig 
FILESEXTRAPATHS_prepend := "${THISDIR}/${BPN}:"

SRC_URI += " \
    file://inetd.conf \
    "

do_install_append() {
    install ${WORKDIR}/inetd.conf ${D}${sysconfdir}
}

BUSYBOX_SPLIT_SUID = "0"
-------------------------------------------------------------------

Best Regards, Erwin Rieger



-----ChenQi <Qi.Chen at windriver.com> schrieb: -----
An: <Erwin.Rieger.ext at rohde-schwarz.com>, <yocto at yoctoproject.org>
Von: ChenQi <Qi.Chen at windriver.com>
Datum: 03.02.2015 02:48
Betreff: Re: [yocto] How to use different busybox defconfig's in the initramfs and rootfs image

The only way I know is to make a new recipe, busybox-initramfs.bb, for example.
Install busybox for image rootfs and busybox-initramfs for initramfs.

Best Regards,
Chen Qi

On 02/02/2015 09:21 PM, Erwin.Rieger.ext at rohde-schwarz.com wrote:
Hello list,

i have used Yocto to create a initramfs linux kernel and a corresponding rootfs for a embedded linux system.

Things are working as expected, so far.

Now i want to fine-tune my setup and want to use a different busybox configuration in the initramfs as the one in the rootfs image.
For example, the initramfs busybox should contain support for switch-root and that is not needed in the rootfs.
On the other hand, the rootfs should contain a "full-fledged" busybox (with inetd enabled, for example).

So the question is: How can i build/install a package two times with differing configurations in one bitbake run?.

How can this be done the Yocto-way without copying busybox.bb and hacking it the way i need it?

I've tried various combinations, e.g. bb-appending busybox, inheriting from busybox and so on - but to no avail.

Maybe someone have an idea on how to do that?


PS:
* The kernel recipe is derived (bbappend) from core-image-minimal-initramfs.
* Rootfs recipe is derived from core-image-minimal.bb.


-- 
Erwin Rieger
-- 



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