F24 System Wide Change: Systemd package split

[Jan Kurik]

= Proposed System Wide Change: Systemd package split =
https://fedoraproject.org/wiki/Changes/systemd_package_split

Change owner(s):
Zbigniew Jędrzejewski-Szmek <zbyszek AT in DOT waw DOT pl>

Two new subpackages will be split out from the main systemd package.
systemd-container will contain stuff for launching and managing VMs
and containers. system-udev will contain udevd and other
hardware-related bits.

== Detailed Description ==
* systemd-container.rpm will consist of systemd-nspawn,
systemd-machined, machinectl, systemd-importd, systemd-pull.
* systemd-udev.rpm will consist of systemd-udevd, udevadm, udev rules,
and the hardware database.

Both new subpackages will be optional. systemd-container.rpm is useful
only for people creating containers or VMs. systemd-udev.rpm should be
generally installed, but can be skipped in containers.

== Scope ==
Proposal owners:
* Update packaging to create the new subpackages.

Other developers:
* add dependencies on systemd-udev and systemd-container as necessary
for other packages, modify comps. Make sure anaconda installs
systemd-udev by default.

Release engineering: N/A

List of deliverables: N/A

Policies and guidelines: N/A

Trademark approval: N/A (not needed for this Change)
-- 
Jan Kuřík
Platform & Fedora Program Manager
Red Hat Czech s.r.o., Purkynova 99/71, 612 45 Brno, Czech Republic
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[Richard W.M. Jones]

On Wed, Nov 18, 2015 at 05:32:02PM +0100, Jan Kurik wrote:
>  * systemd-udev.rpm will consist of systemd-udevd, udevadm, udev
> rules,
>  and the hardware database. 
So close!  libguestfs needs udevd and /sbin/reboot.  Unfortunately the
latter is still part of the main systemd package.

Rich.

-- 
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
Read my programming and virtualization blog: http://rwmj.wordpress.com
Fedora Windows cross-compiler. Compile Windows programs, test, and
build Windows installers. Over 100 libraries supported.
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[Zbigniew Jędrzejewski-Szmek]

On Thu, Nov 19, 2015 at 10:28:25PM +0000, Richard W.M. Jones wrote:
>  On Wed, Nov 18, 2015 at 05:32:02PM +0100, Jan Kurik wrote:
>  > * systemd-udev.rpm will consist of systemd-udevd, udevadm, udev rules,
>  > and the hardware database.
>  
>  So close!  libguestfs needs udevd and /sbin/reboot.  Unfortunately the
>  latter is still part of the main systemd package. 
reboot is systemctl is a thin
client for systemd, so no hope here :)

Zbyszek

[Stephen Gallagher]

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On 11/19/2015 09:04 PM, Zbigniew Jędrzejewski-Szmek wrote:
>  On Thu, Nov 19, 2015 at 10:28:25PM +0000, Richard W.M. Jones
>  wrote:
> > On Wed, Nov 18, 2015 at 05:32:02PM +0100, Jan Kurik wrote:
> >> * systemd-udev.rpm will consist of systemd-udevd, udevadm, udev
> >> rules, and the hardware database.
> > 
> > So close!  libguestfs needs udevd and /sbin/reboot.
> > Unfortunately the latter is still part of the main systemd
> > package.
>  reboot is systemctl is a thin client for systemd, so no hope here
>  :) 
Why does libguestfs need /sbin/reboot? That seems a little suspect to me.

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[Richard W.M. Jones]

On Fri, Nov 20, 2015 at 08:38:40AM -0500, Stephen Gallagher wrote:
>  -----BEGIN PGP SIGNED MESSAGE-----
>  Hash: SHA1
>  
>  On 11/19/2015 09:04 PM, Zbigniew Jędrzejewski-Szmek wrote:
>  > On Thu, Nov 19, 2015 at 10:28:25PM +0000, Richard W.M. Jones
>  > wrote:
>  >> On Wed, Nov 18, 2015 at 05:32:02PM +0100, Jan Kurik wrote:
>  >>> * systemd-udev.rpm will consist of systemd-udevd, udevadm, udev
>  >>> rules, and the hardware database.
>  >> 
>  >> So close!  libguestfs needs udevd and /sbin/reboot.
>  >> Unfortunately the latter is still part of the main systemd
>  >> package.
>  > reboot is systemctl is a thin client for systemd, so no hope here
>  > :)
>  
>  Why does libguestfs need /sbin/reboot? That seems a little suspect to me. 
It runs it:

  https://github.com/libguestfs/libguestfs/blob/master/appliance/init#L196

But actually it only runs `reboot -f', because we have no systemd in
the appliance -- as there is only one process + udevd in the
appliance, using systemd would be overkill.  So that could be replaced
with a simple system call to `reboot (RB_AUTOBOOT)'.

Rich.

-- 
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
Read my programming and virtualization blog: http://rwmj.wordpress.com
virt-df lists disk usage of guests without needing to install any
software inside the virtual machine.  Supports Linux and Windows.
http://people.redhat.com/~rjones/virt-df/

[Zbigniew Jędrzejewski-Szmek]

On Sat, Nov 21, 2015 at 05:16:33PM +0000, Richard W.M. Jones wrote:
>  On Fri, Nov 20, 2015 at 08:38:40AM -0500, Stephen Gallagher wrote:
>  > -----BEGIN PGP SIGNED MESSAGE-----
>  > Hash: SHA1
>  > 
>  > On 11/19/2015 09:04 PM, Zbigniew Jędrzejewski-Szmek wrote:
>  > > On Thu, Nov 19, 2015 at 10:28:25PM +0000, Richard W.M. Jones
>  > > wrote:
>  > >> On Wed, Nov 18, 2015 at 05:32:02PM +0100, Jan Kurik wrote:
>  > >>> * systemd-udev.rpm will consist of systemd-udevd, udevadm, udev
>  > >>> rules, and the hardware database.
>  > >> 
>  > >> So close!  libguestfs needs udevd and /sbin/reboot.
>  > >> Unfortunately the latter is still part of the main systemd
>  > >> package.
>  > > reboot is systemctl is a thin client for systemd, so no hope here
>  > > :)
>  > 
>  > Why does libguestfs need /sbin/reboot? That seems a little suspect to me.
>  
>  It runs it:
>  
>    https://github.com/libguestfs/libguestfs/blob/master/appliance/init#L196
>  
>  But actually it only runs `reboot -f', because we have no systemd in
>  the appliance -- as there is only one process + udevd in the
>  appliance, using systemd would be overkill.  So that could be replaced
>  with a simple system call to `reboot (RB_AUTOBOOT)'. 
Filesystems should be
synced first (that's what systemctl reboot -f / reboot -f does).
I don't know if libguestfs does that separately.

Zbyszek

[Richard W.M. Jones]

On Sat, Nov 21, 2015 at 05:47:05PM +0000, Zbigniew Jędrzejewski-Szmek wrote:
>  On Sat, Nov 21, 2015 at 05:16:33PM +0000, Richard W.M. Jones wrote:
>  > On Fri, Nov 20, 2015 at 08:38:40AM -0500, Stephen Gallagher wrote:
>  > > -----BEGIN PGP SIGNED MESSAGE-----
>  > > Hash: SHA1
>  > > 
>  > > On 11/19/2015 09:04 PM, Zbigniew Jędrzejewski-Szmek wrote:
>  > > > On Thu, Nov 19, 2015 at 10:28:25PM +0000, Richard W.M. Jones
>  > > > wrote:
>  > > >> On Wed, Nov 18, 2015 at 05:32:02PM +0100, Jan Kurik wrote:
>  > > >>> * systemd-udev.rpm will consist of systemd-udevd, udevadm, udev
>  > > >>> rules, and the hardware database.
>  > > >> 
>  > > >> So close!  libguestfs needs udevd and /sbin/reboot.
>  > > >> Unfortunately the latter is still part of the main systemd
>  > > >> package.
>  > > > reboot is systemctl is a thin client for systemd, so no hope here
>  > > > :)
>  > > 
>  > > Why does libguestfs need /sbin/reboot? That seems a little suspect to me.
>  > 
>  > It runs it:
>  > 
>  >   https://github.com/libguestfs/libguestfs/blob/master/appliance/init#L196
>  > 
>  > But actually it only runs `reboot -f', because we have no systemd in
>  > the appliance -- as there is only one process + udevd in the
>  > appliance, using systemd would be overkill.  So that could be replaced
>  > with a simple system call to `reboot (RB_AUTOBOOT)'.
>  Filesystems should be synced first (that's what systemctl reboot -f / reboot -f
> does).
>  I don't know if libguestfs does that separately. 
Yes that is (of course) done by the daemon.  We pay very close
attention to filesystem integrity.

Rich.

-- 
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
Read my programming and virtualization blog: http://rwmj.wordpress.com
Fedora Windows cross-compiler. Compile Windows programs, test, and
build Windows installers. Over 100 libraries supported.
http://fedoraproject.org/wiki/MinGW