Re: [PATCH] udev: sync udev rules directories with systemd units directories

[Tom Gundersen <teg@jklm.no>]

On Tue, Jul 17, 2012 at 2:57 AM, William Hubbs <w.d.hubbs@gmail.com> wrote:
> Whoever was working on this back then decided that we should move most
> of the critical shared libraries to /lib or /lib64 and put linker
> scripts in /usr/lib*. That has to disappear before we can even think
> about the /usr merge.
>
> Also, remember that we are a rolling release distro. We do not have
> specific gentoo x.x releases; users just go along updating packages. So,
> I'm not sure how to force the /usr merge and symlink creation to happen
> on all of our users' systems in one go.

We had a similar issue in Arch. What we did was the following:

Patch udev+kmod+systemd (the last one was for free) to read from
{/usr,}/lib/{modprobe.d,depmod.d,udev/rules.d,systemd/system}.

We then rebuild all the packages that installed binaries to /lib/udev/
and /lib/systemd to move them to their /usr/lib counterparts (as we
did not want to patch udev/systemd to read the helpers from more than
one location).

Then we let people rebuild their packages to move things from /lib to
/usr/lib on a package-by-package basis.

Then we rebuilt all our kernels and pointed kmod/udev to
/usr/lib/modules rather than /lib/modules.

At this point only glibc owned stuff in /lib, so we rebuilt that to
move it all to /usr/lib and replace /lib with a symlink to /usr/lib.

The only step that caused any issues was the last one, and that was
due to users ignoring the upgrade instructions[0] and doing clever
things like "rm -rf /lib".

HTH,

Tom

[0]: <http://www.archlinux.org/news/the-lib-directory-becomes-a-symlink/>