[OE-core] Best practices: Multiple images on one partition.

Paul Barker pbarker at konsulko.com
Wed Jan 15 13:52:51 UTC 2020

On Wed, 15 Jan 2020 at 13:05, Ricardo Ribalda Delgado
<ricardo.ribalda at gmail.com> wrote:
> Hello
> I am trying to figure out the best way to achieve this. I have a
> system with a host and a target. The target netboots form the host and
> have a different package architecture.
> Usually I was solving this with one partition per image/machine,
> combined using a .wks file like:
> part /export --source rootfs --rootfs-dir=target-image  --fstype=ext4
> --label export --align 1024 --use-uuid --fsoptions defaults,ro
> --extra-space 400M
> part / --source rootfs --fstype=ext4 --label rootfs --align 1024
> --use-uuid --fsoptions defaults,ro --extra-space 400M
> and then calling wic file after generating both images. ("wic create....")
> This works fine, but now I need to combine both partitions into one.
> The reason is that the partition needs to play nice with the current
> OTA upgrade system.
> What would be the best way to do this?
> 1) Implement a new wic plugin, called something like muli-rootfs,
> where I can specify multiple rootfs and in which directory to unpack
> them
> 2) Implement a .bb file that combines the two images in one.
> do_install() {
>     tar -mzxf $HOST/host-image.tar.gz  -C ${D}/
>     tar -mzxf $HOST/target-image.tar.gz  -C ${D}/export
> }
> 3) Another way that I am not aware :)

I've recently added the `--include-path` option to wic on master which
may be helpful here:
My use case was multiple rootfs copies on different partitions, with
extra files added to just one copy of the rootfs. But it may also be
useful for this case.


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