[yocto] How to split rootfs image?

[Darcy Watkins]

I did something similar to this a while back, but I didn’t care about the image itself, just the manifest so I could generate RPM lists.

So we would install the base content from a tarball and then install supplemental / optional content from RPMs.

I used a filter in my script to exclude the roots bootstrap components when I processed through the manifest.


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Regards,

Darcy

Darcy Watkins ::  Senior Staff Engineer, Firmware

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On Jul 15, 2018, at 12:24 PM, Lukasz Zemla <Lukasz.Zemla at woodward.com<mailto:Lukasz.Zemla at woodward.com>> wrote:


Dear All,



Because of some formal reasons, we would like to split our rootfs image into 2 parts:

1. base system - to be reused between different project variants, typical rootfs content.

2. application/data - less critical application, configuration, data, logs.



How to generate in Yocto application/data image(2)?

It is about generation of empty image containing only requested packages, like Package-A, Package-B...



We tried following:



inherit image

IMAGE_FEATURES = ""

DISTRO_FEATURES = ""



IMAGE_INSTALL = " \

               Package-A \

               Package-B \

               "

IMAGE_FSTYPES = "ubi tar.gz"



But it produces classical rootfs image with (unwanted): bin, boot, etc, lib... We'd prefer to have it built in an efficient way, so we'd like to avoid generating full image and then removing files by hand in postprocess command.



Thank you in advance,

Lukasz


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