Feature 'usrmerge' is coming...

[Patrick Williams]

Hello,

Historically, Linux has had a distinction between directories like
`/bin` and `/usr/bin`.  This has been called 'split-usr' by some.
There has been some effort in some distributions to move
`/{bin,sbin,lib}` to be combined with their peers under `/usr`, which
has been called 'merged-usr'.

An upcoming systemd release this summer is going to remove support for
'split-usr'[1] and I want to get out in front of it so we are not caught
off guard.  Yocto already supports this through a DISTRO_FEATURE named
`usrmerge`.  I have enabled this on the Bletchley machine and what it
does is turn `/bin`, etc. into symlinks to `/usr/bin` (etc.).  I believe
that means it should be trivial for us to enable.

I'm going to leave the commit[2] in Gerrit until May 26th (or later) to
solicit feedback.  If I hear no concerns about it, this will be merged.

It would be good for repository maintainers to look for usage of things
like `${base_bindir}` in their recipes and builds and to start a
migration towards the regular `${bindir}` (and friends).

[1]: https://lists.freedesktop.org/archives/systemd-devel/2022-September/048352.html
[2]: https://gerrit.openbmc.org/c/openbmc/openbmc/+/63586

-- 
Patrick Williams
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