[systemd-devel] Antw: [EXT] Dropping split-usr/unmerged-usr support

[Neal Gompa]

On Wed, Apr 6, 2022 at 6:45 AM Luca Boccassi <luca.boccassi at gmail.com> wrote:
>
> On Wed, 2022-04-06 at 08:05 +0200, Ulrich Windl wrote:
> > > > > Luca Boccassi <luca.boccassi at gmail.com> schrieb am 05.04.2022
> > > > > um 22:07 in
> > Nachricht <05cf10d04274dcbff07fed88e98dca2eebb24b7d.camel at gmail.com>:
> > > Hi,
> > >
> > > As part of our spring cleaning effort, we are considering when to
> > > drop
> > > support for split/unmerged-usr filesystem layouts.
> > >
> > > A build-time warning was added last year:
> > >
> > > https://github.com/systemd/systemd/commit/9afd5e7b975e8051c011ff9c07c95e80bd
> > > 954469
> >
> > Honestly to me the requirement that /usr be part of the root
> > filesystem never had a reasonable argument.
> > Instead I think systemd quit the concept of a simple scaled-down
> > subset to bring up the system.
> > Also with initrd/dracut the concept is even more odd, because the
> > /usr found there is just some arbitrary subset of the real /usr
> > (similar for other filesystems).
> > So why couldn't that work with a really scaled-down /sbin?
> >
> > >
> > > We are now adding a runtime taint as well.
> > >
> > > Which distributions are left running with systemd on a
> > > split/unmerged-
> > > usr system?
> > >
> > > (reminder: we refer to a system that boots without a populated /usr
> > > as
> > > split-usr, and a system where bin, sbin and lib* are not symlinks
> > > to
> > > their counterparts under /usr as unmerged-usr)
> >
> > Symlinking /sbin or /usr/sbin binaries to /usr is also a bad concept
> > IMHO.
> >
> > It seems systemd is the new Microsoft ("We know what is good for you;
> > just accept it!") ;-)
> >
> > Regards,
> > Ulrich
>
> Sorry, but you are about ~10 years late to this debate :-) The question
> today is not whether it's good or bad, but who's left to do the switch.
>
> We know Fedora/RHEL/CentOS/SUSE/Arch/Ubuntu have done the switch, and
> presumably any of their derivatives.
>
> We know Debian is, er, working on it, as per the most recent article on
> LWN.
>

Debian is expected to complete this with Debian 12, I believe.

> What about other distros that are not derivatives of the aboves and
> that use systemd? Does anybody have any insight?
>

OpenMandriva and Yocto both haven't done the switch yet, as far as I'm
aware. Might be worth reaching out to them and finding out when
they're going to do it.



--
真実はいつも一つ！/ Always, there's only one truth!