[yocto] Custom image type and CONVERSION_CMD images softlink problem

[Mirza Krak]

Hi.

I am working with a project that has a custom image type, "sdimg". The
image works fine but it is when I try to apply CONVERSION_CMDs that I
see some interesting things.

The image output is:

     ${IMGDEPLOYDIR}/${IMAGE_NAME}.$suffix

There is also a soft-link:

    ln -sfn "${IMAGE_NAME}.$suffix"
"${DEPLOY_DIR_IMAGE}/${IMAGE_BASENAME}-${MACHINE}.$suffix"

Now the interesting part comes when I try this:

     IMAGE_FSTYPES += "sdimg.gz"

This results in a empty gz file, but I already know why and that is
because the "normal" image does not contain IMAGE_NAME_SUFFIX in the
output name, on which the CONVERSION_CMDs rely on [1].

So instead of changing the image name I was hoping that this should
work (default is ".rootfs" in image_types.bbclass):

    IMAGE_NAME_SUFFIX_sdimg = ""

But above only partly works. It will generate a proper "gz" version of
"sdimg" but it fails to create a soft-link, that is
${IMAGE_BASENAME}-${MACHINE}.sdimg.gz -> ${IMAGE_NAME}.sdimg.gz. And I
have traced down on why. It is because image.bbclass still reads
IMAGE_NAME_SUFFIX as ".rootfs" in create_symlinks[2] even though I
have set it to something else for my specific image type (override).

I have a couple of workarounds for this already but still wanted to
report this and see what the community thinks about this. I would
expect what I am trying to do, to work. That is to set
IMAGE_NAME_SUFFIX to empty for the custom image.

But you might be of another opinion.

[1]. https://github.com/openembedded/openembedded-core/blob/master/meta/classes/image_types.bbclass#L284
[2]. https://github.com/openembedded/openembedded-core/blob/master/meta/classes/image.bbclass#L592-L614

-- 
Med Vänliga Hälsningar / Best Regards

Mirza Krak
email: mirza at mkrak.org
web: http://mkrak.org