Investigate what's needed for "Unify `/usr/bin` and `/usr/sbin`" Fedora change

[travier]

Describe the enhancement

✔️ Unify /usr/bin and /usr/sbin

• The /usr/sbin directory becomes a symlink to bin, which means paths like /usr/bin/foo and /usr/sbin/foo point to the same place. /bin and /sbin are already symlinks to usr/bin and usr/sbin, so effectively /bin/foo and /sbin/foo also point to the same place. /usr/sbin will be removed from the default $PATH. The same change is also done to make /usr/local/sbin point to bin, effectively making /usr/local/bin/foo and /usr/local/sbin/foo point to the same place. The definition of %_sbindir will be changed to %_bindir, so packages will start using the new directory after a rebuild without any further action. Maintainers may stop using %_sbindir, but don't need to.
• Tracking bug: #2267022
• NOTES: TR: Should not impact FCOS

This is apparently impacting Silverblue so might impact FCOS:

• https://bodhi.fedoraproject.org/updates/FEDORA-2024-3aafcac6a8#comment-3606693
• https://openqa.fedoraproject.org/tests/2723291#step/_ostree_build/45

Edit: Created: https://gitlab.com/fedora/bootc/tracker/-/issues/29

See: https://github.com/coreos/fedora-coreos-tracker/issues/1714#issuecomment-2223100778

System details

N/A

Additional information

No response

[travier]

See: https://lists.fedoraproject.org/archives/list/devel@lists.fedoraproject.org/thread/EOKNNAMSTPNFVKU3WQ3R42HFXKE6QLJS/

[travier]

This should be ready in Rawhide: https://gitlab.com/fedora/bootc/tracker/-/issues/29. This would need testing.

[travier]

This might also impacts systems that have binaries in /usr/local/sbin as those should be moved to /usr/local/bin.

[jlebon]

Note also that currently /usr/local is populated by rpm-ostree: https://github.com/coreos/rpm-ostree/blob/b34bc4fb7ae32926372eca0de7987bbb0da4fa06/src/app/rpm-ostree-0-integration.conf#L8-L18

Strictly speaking, we would have to also update things so that on f42+, we match what filesystem now does there too.