Re: [PATCH] Allow disabling the build of all of systemd, leaving just udev

William Hubbs wrote:
> On Sun, Jun 03, 2012 at 09:55:55AM -0700, Bryan Kadzban wrote:
>> Which pieces?
> 
> etc/bash_completion.d
> etc/systemd
> usr/include/systemd
> usr/lib/sysctl.d
> usr/lib/systemd/system-generators
> usr/lib/systemd/user
> usr/share/man/man1
> usr/share/man/man3
> usr/share/man/man5
> usr/share/polkit-1
> usr/share/polkit-1/actions
> usr/share/systemd

Those are all the empty directories that a newer automake will get rid
of, except two. You can suppress those at install time with:

make pkgincludedir= pkgsysconfdir= install

I can't fix pkgincludedir without warnings from automake (since it's
unconditionally set to $(includedir)/$(PACKAGE), and overriding it in
different branches of a conditional generates warnings), so I didn't fix
either of them.

> One more thing though, thinking about it, is that we will need the
> systemd-tmpfiles tool because udev is not going to support the
> /lib/udev/devices directory any longer for creating custom devices, so
> you might want to still build and install all of the parts of that for a
> standalone udev build if doing so doesn't bring in more dependencies.

I'd rather not replace "cp -a /lib/udev/devices/* /dev" in a boot script
with a binary that nothing else uses, plus its configuration (which
doesn't use nodes in /lib/udev/devices like what has been the udev ABI
for *years*, but instead uses a list of device descriptions), plus any
systemd-level libraries it may or may not need in the future.

If a system is already running systemd, then systemd-tmpfiles may or may
not be the best place to do this (the ABI change is a problem for those
systems, unless I'm missing something in the *tmpfiles* manpages). But
if systemd is not running, then sticking to the previous ABI explicitly
is the right way to go I think.

(Previously, packages could dump a device node into /lib/udev/devices
and it would show up on every boot. Now, they have to describe the
device node and dump a file into $(tmpfilesdir), wherever that happens
to be. This is obviously an interface change.)
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