Yocto upgrade from fido to morty rootfs is read-only error - yocto

Question

So, I was given the task to upgrade our yocto based system from fido to morty. I have very little experience with yocto, I have been struggling with it and trying to understand it for almost a week now. I have managed to fix some issues, but now I'm facing a problem when trying to build the image:
ERROR: basic-image-1.0-r0 do_rootfs: The following packages could not be configured offline and rootfs is read-only: ['component']
ERROR: basic-image-1.0-r0 do_rootfs: Function failed: do_rootfs
If I disable the compoents the basic-image builds just fine, and both of them build just fine on their own, i.e bb component
I don't even know where to start looking for a solution. So if you have any idea what might be causing this or where to start looking for a solution, it would be greatly appreciated.
Ofcourse I have been browsing the yocto manuals, but there is so much stuff that I'm just overwhelmed by all of it.

Answer 1

Well, the "problem" stems from the fact that you have the following in your image:
IMAGE_FEATURES += "read-only-rootfs"
That implies that nothing can modify the rootfs during runtime, everything has to be done off-line, i.e. when constructing the rootfs in question.
Your package component (adcl and cfgmgr in your original question), all have a post-installation script including the following snippet:
pkg_postinst_${PN} () {
if test "x$D" != "x" then
# Need to run on first boot
exit 1
fi
}
(Something similar at least, which exit 1).
The conditional in my example checks if the pkg_postinst script is being run during rootfs creation, if so, it exits with 1 as exit status. That means that the pkg_postinst has to be run live on the target system. However, as the target system is read-only, this will be impossible, and the build fails.
You'll have to check for pkg_postinst scripts, and rewrite them, such that they're able to be run during rootfs creation.