[Pkg-utopia-maintainers] RFS: dbus-broker/11-1 [ITP] -- Linux D-Bus Message Broker

[Daniele Nicolodi]

Package: sponsorship-requests
Severity: normal

Dear mentors,

I am looking for a sponsor for my "dbus-broker" package

* Package name: dbus-broker
  Version : 11
  Upstream Author : David Herrmann  et al.
* URL : https://github.com/bus1/dbus-broker/
* License : Apache-2.0
  Section : admin
  Programming Lang: C
  Description : Linux D-Bus Message Broker

It builds those binary packages:

  dbus-broker - Linux D-Bus Message Broker

To access further information about this package, please visit the
following URL: https://mentors.debian.net/package/dbus-broker

Alternatively, one can download the package with dget:

  dget -x
https://mentors.debian.net/debian/pool/main/d/dbus-broker/dbus-broker_11-1.dsc

Or from the repository:

  https://salsa.debian.org/dnn-guest/dbus-broker

Cheers,
Dan


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Re: [Pkg-utopia-maintainers] Systemd user instance equivalent of dh_systemd_enable?

[Daniele Nicolodi]

Hi Simon,

I'm dropping debian-mentors@d.o from the recipients list as I think it
the discussion is not relevant for that list anymore.

On 08/04/2018 16:20, Simon McVittie wrote:
> On Sun, 08 Apr 2018 at 08:26:13 -0600, Daniele Nicolodi wrote:
>> the package is dbus-broker, a replacement for dbus-deamon. You may have
>> heard of it: there has been a short exchange about its packaging for
>> Debian with its developers with the Debian dbus maintainers in Cc.
> 
> Sorry, I didn't see that conversation until now. Please use the role address
> @packages.debian.org if you want to reach package maintainers:

Will do, thanks. I thought I added all maintainers individual addresses
at some point in the discussion, but probably I didn't...

> If dbus-broker is uploaded to Debian as an optional dbus-daemon
> replacement, it will definitely need to be coordinated with the dbus
> source package. Having the two packages coexist is probably not going to
> be straightforward to set up, and if any diversions, alternatives etc.
> are going on, all maintainers of the dbus package will need to be aware
> of them.

I have the package ready, and it works fine without any diversion,
alternatives or other trickery.  It has been surprisingly easy, indeed.
You can get the package here:

https://salsa.debian.org/dnn-guest/dbus-broker

It works fine minus replacing dbus-deamon for the user bus, which
prompted the email at the origin of this thread.  It needs to be done
manually (see README.Debian) or installing a

/etc/systemd/user/dbus.service

symlink. I don't know what's the best strategy, yet.

I'm happy to work with the dbus maintainers to fix any issue.

Incidentally, I will be looking for a sponsor to upload the package to
unstable as soon as I figure out how to solve the above minor issue. It
would be great if someone among the dbus maintainers could act as sponsor.

> I do not expect that dbus-broker will be compatible with every D-Bus
> service in Debian. The one incompatibility that I'm reasonably sure exists
> is that if the Exec= for an activatable service points to a command that
> will fork (background itself) and exit 0, dbus-daemon tolerates this
> (at the cost of worse error behaviour because it cannot tell whether
> the service subsequently fails), while dbus-broker almost certainly does
> not. This is inadvisable behaviour even with the reference dbus-daemon,
> so I'd consider it to be a bug in the service, but unfortunately it can't
> be detected statically.

That would need to be investigated indeed.  So far the package works
well on a couple of very minimal installs I tried it on.

Thanks!  Cheers,
Dan

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Re: [Pkg-utopia-maintainers] dbus-broker Debian packaging

[Daniele Nicolodi]

Hi David,

On 04/03/2018 05:08, David Herrmann wrote:
> *) The dbus-broker project uses submodules to link some code
> statically. The easiest way to build dbus-broker is using our .tar.xz
> tarballs provided with each release [1]. These include *all* source
> files, including the right submodule versions. If you want to build
> from -git directly, though, I recommend the strategy used by the
> arch-linux -git package [2]. They check out all required repositories
> and then use git to check out the correct revisions. This is
> definitely more flexible than the tarball based approach, but also
> needs slightly more maintenance, as you need to stay up-to-date with
> the submodules.

Debian tooling handles the submodules fine, I just compared the released
tarball for v11 with the one generated by the Debian tooling from the
git repository and they are substantially identical.

However, I noticed that not all the submodules have the same license as
dbus-broker, I need to complete the debian/copyright file. Also, I
noticed that Red Hat is listed as the copyright holder. Is that true for
all contributions?

> *) The dbus-broker binary itself is definitely intended to be useful
> on its own. However, no such users are known, and so far we have *not*
> stabilized its API, yet. Hence, I would not split it apart now, but
> leave it for a future extension. That is, something like a
> `dbus-broker-core` package, which just contains the broker, but not
> the launcher.

I think that having `dbus-broker` and `dbus-broker-launcher` packages
would be more logical, but I don't see reasons why the split cannot
happen when the need will emerge, or when the API will be stable.

> *) We are reworking the Fedora package at the moment. I cannot say how
> the ultimate solution will look like, but the plan right now is this:
> dbus-daemon is split into multiple packages. One packages
> (dbus-daemon-utils) provides all the utilities (dbus-send,
> dbus-monitor, ...).

I would call this `dbus-utils`, but.. bikeshedding.

> Another package (dbus-daemon) provides the daemon
> binary and its related tools (dbus-daemon, dbus-launch, ...), as well
> as a renamed service file `dbus-daemon.service`.
> For dbus-broker we provide one package that ships the broker+launcher,
> as well as the dbus-broker.service unit file.
> Lastly, we intend to recreate the `dbus` package as a simple package
> that both dbus-daemon and dbus-broker depend on, and it provides the
> daemon-xml files (config and policy).

If there is interest for dbus-broker in Debian and the dbus maintainers
agree, I can work on patches to do the same for the Debian's dbus package.

> Depending on what the default setup for your system should be, you
> should run `systemctl enable dbus-{daemon,broker}.service`. They will
> then create the dbus.service symlink. Fedora intends to use the
> systemd-presets for this.

That would need to be done differently on Debian, I guess.  I will need
to do some reading about what the correct solution would be there.

> I hope this information is of help to you!

Thank you for the detailed reply, it surely helps.

Cheers,
Dan

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Re: [Pkg-utopia-maintainers] dbus-broker Debian packaging

[Daniele Nicolodi]

I just pushed the packaging here:

https://salsa.debian.org/dnn-guest/dbus-broker

Cheers,
Dan


On 03/03/2018 19:00, Daniele Nicolodi wrote:
> Hello Debian dbus maintainers and dbus-broker authors,
> 
> I'm working on packaging dbus-broker for Debian [0].
> 
> In the packaging, I'm not sure in how many binary packages the project
> should be split.  I thought asking the authors and the dbus maintainers
> could be valuable.
> 
> dbus-broker provides dbus-broker-launcher and systemd unit files that
> provide configuration files compatibility with the D-Bus reference
> implementation, however dbus-broker can be useful in itself to implement
> private buses.
> 
> Should dbus-broker and the launcher (and the systemd unit files) be part
> of two separate binary packages?  Is the interface between the broker
> and the launcher stable?
> 
> Should be the system D-Bus be replaced when dbus-broker is install?
> What about the user bus?
> 
> Is the Debian Utopia team interested in team maintenance of the
> dbus-broker package?  I would also need a sponsor to upload the package.
> 
> Thank you for your time.
> 
> Cheers,
> Dan
> 
> 
> [0] Quoting https://github.com/bus1/dbus-broker/:
> 
> The dbus-broker project is an implementation of a message bus as
> defined by the D-Bus specification. Its aim is to provide high
> performance and reliability, while keeping compatibility to the D-Bus
> reference implementation. It is exclusively written for linux systems,
> and makes use of many modern features provided by recent linux kernel
> releases.
> 


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[Pkg-utopia-maintainers] dbus-broker Debian packaging

[Daniele Nicolodi]

Hello Debian dbus maintainers and dbus-broker authors,

I'm working on packaging dbus-broker for Debian [0].

In the packaging, I'm not sure in how many binary packages the project
should be split.  I thought asking the authors and the dbus maintainers
could be valuable.

dbus-broker provides dbus-broker-launcher and systemd unit files that
provide configuration files compatibility with the D-Bus reference
implementation, however dbus-broker can be useful in itself to implement
private buses.

Should dbus-broker and the launcher (and the systemd unit files) be part
of two separate binary packages?  Is the interface between the broker
and the launcher stable?

Should be the system D-Bus be replaced when dbus-broker is install?
What about the user bus?

Is the Debian Utopia team interested in team maintenance of the
dbus-broker package?  I would also need a sponsor to upload the package.

Thank you for your time.

Cheers,
Dan


[0] Quoting https://github.com/bus1/dbus-broker/:

The dbus-broker project is an implementation of a message bus as
defined by the D-Bus specification. Its aim is to provide high
performance and reliability, while keeping compatibility to the D-Bus
reference implementation. It is exclusively written for linux systems,
and makes use of many modern features provided by recent linux kernel
releases.

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