Drop split-usr and unmerged-usr support

[bluca]

As previously announced. This goes all the way, even images that are split-usr won't be usable anymore e.g. as portable images.

[yuwata]

May not be necessary to do in this PR, but do_test() in test/test-functions should be updated:

systemd/test/test-functions

Lines 3272 to 3275 in 8e81885

	# Detect lib paths
	[[ "$libdir" ]] || for libdir in /lib64 /lib; do
	[[ -d $libdir ]] && libdirs+=" $libdir" && break
	done

[keszybz]

I'm surprised how little code that is.

So… should we merge this now, or should we release v254 and only merge it at the beginning of the cycle?

[bluca]

I'm surprised how little code that is.

So… should we merge this now, or should we release v254 and only merge it at the beginning of the cycle?

We are in H2 2023 so we should just go for it now. The only question is, do we want to keep support for older images e.g. in portable services?

[bluca]

CIs are sad because:

rpm specifies 'split-usr':

meson.build:3:0: ERROR: Unknown options: "split-usr"

debian/ubuntu expect to find files installed in the legacy dirs - this is going to be fun, as it's either/or, so would need some good timed merges... and break the stable branches CI

[poettering]

hmm, i figure we should announce this PR on systemd-devel, just in case?

[bluca]

hmm, i figure we should announce this PR on systemd-devel, just in case?

after it's merged, sure