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I'm trying to make a sym link in Yocto to enable a systemd service that is not enabled by default (apache2, by the way). Here my post process command:

my_postprocess_function() {
    ln -s ${IMAGE_ROOTFS}/lib/systemd/system/apache2.service ${IMAGE_ROOTFS}/etc/systemd/system/multi-user.target.wants/apache2.service     
}

ROOTFS_POSTPROCESS_COMMAND += "my_postprocess_function; "

Of course the problem is the source file does not exists on the target, but if I use the right path (i.e. /lib/systemd/system/apache2.service) it does not exists on the dev machine and then the recipe fails.

What is the right approach to make a sym link in the rootfs (sub)paths?

  • @meuh your comment is actually the answer. If you write it I can accept it. – Mark Nov 3 '19 at 16:45
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Normally, you can create symbolic links to targets that don't exist. For example, try in any shell

ln -s /no/such/file xxx

and it will create link xxx. So simply remove the first ${IMAGE_ROOTFS} from your command:

ln -s /lib/systemd/system/apache2.service ${IMAGE_ROOTFS}/etc/systemd/system/multi-user.target.wants/apache2.service
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