Comment # 29 on bug 1071224 from Richard Brown

(In reply to Franck Bui from comment #28)
> (In reply to Richard Brown from comment #27)
> > 
> > You can not write to /usr/lib/systemd/scripts/ on a read only filesystem
> 
> The problem happens when the system boots right, it doesn't happen when
> systemd package is upgraded ?
> 
> And how are we supposed to implement "run this script once" on these
> platforms ?
> 
> Thanks.

The only time you can write to the rootfs on Kubic and CaaSP is during a
package installation/upgrade - the rootfs is immutable, but the package changes
are written to a new snapshot which will take effect on next boot

So the only place you COULD implement this logic is in the %post

I think you should not, I think this is an overly complex solution for little
or no benefit. I think this is a perfect example in the flesh of why Ludwig and
Thorsten were both right earlier in this thread.

Please reconsider their advised solutions of a subpackage or packaged examples