Re: Mass bug filing: use and misuse of dbus-launch (dbus-x11)

[Steve Litt]

ought that address=unix:runtime=yes might, but that did not either.
> 
[snip]
> 
> Simon McVittie:
> 
> > To be brutally honest, there is a fairly low limit to how much
> > benefit I can create by giving new things to PC-BSD users, [...]
> >  
> That's not the right way to look at it.  

This is precisely the right way to look at it, when it pertains to
systemd.

> You yourself have just said 
> several times that this is stuff that is supposed to be on "supported 
> Unix platforms".  This isn't giving new things to anyone.  This is 
> making existing things, that you yourself think are existing, work.

If these existing things can't be made to work without systemd
incorporation, they should be torn out and replaced. Encumbering a good
system with systemd is not the answer.

> 
> I shouldn't dismiss PC-BSD so readily, if I were you, either. PC-BSD 
> (now rebranded as TrueOS Desktop a few days ago -- I just got through 
> changing a whole load of preset file and -run package names.) is the
> BSD that comes in the box with the desktop environments and with all
> of the desktop programs that use Desktop Bus.  Yes, people can and do
> run all of this stuff on FreeBSD and OpenBSD from ports.  But
> PC-BSD^H^H^H^H^H^H ... Gah! ... TrueOS Desktop is where it comes in
> the box and is run as standard in the default install.  TrueOS
> Desktop is where one ends up choosing from running PCDMd, kdm, lxdm,
> or gdm; and where one gets lots of little Desktop Bus brokers all
> over the place in various ways from these different systems.  TrueOS
> Desktop is where the people who are behind the operating system will
> be strongly motivated towards improving the desktop subsystems and
> the Desktop Bus.

To those who care about simplicity and user-maintainable software, the
preceding paragraph appears to be one possible strategy to continue
eliminating non-systemd choices. Beware.

> 
> You're pushing your new way of per-user Desktop Bus brokers at the 
> world.  I can give the TrueOS Desktop people, and the the UbuntuBSD 
> people, and the Debian FreeBSD people, a service management system
> that I know can run per-user Desktop Bus brokers on a FreeBSD
> kernel.  It already does.  I published it last year. If you, the
> Desktop Bus people, can give us these mechanisms in your program
> actually working on these operating systems, then the TrueOS people
> get the opportunity to simplify some of the scaffolding that they
> have had to erect (PCDM-session writing out nonce scripts that invoke
> dbus-launch, for example), and you get less of the world still using
> your old way of doing things.

LOL, per-user desktops.

There must be a zillion different ways to have sterminal hung off a
Linux box each get their own GUI. I'd do it myself, except that's not
my itch. In a world where a COTS desktop is $600 USD, laptop $500 USD,
and used but still perfectly functional computers can be had for
$50-$200, hanging terminals makes little economic sense. I'm sure the
systemd afficianados will find such a use case, and proclaim that use
case must be served, but we all know it's FUD.

The systemd folks shout from the mountaintops that sysvinit is 32 years
old or whatever, and how that alone is enough reason to use systemd,
and yet these same monuments to modern software proclaim their
multiseat, terminal-enabling technology is a reason to switch to
systemd, even though terminals had their heyday in 1984. Talk about
greybeards.

One more thing: They talk about dbus as if it's a good thing. Even
before systemd, I tried to stay away from a bus system that was pretty
much like a traffic circle enabling everything to talk to everything
else, addressing allowing. What could *possibly* go wrong?

The subject of this thread is "Mass bug filing: use and misuse of
dbus-launch (dbus-x11)". If you're a software user, use dbus as little
as possible. If you're a developer, find other communication methods,
and don't incorporate dbus. Because, as evidenced by this thread, dbus
is now just a pretty entry point to systemd.

SteveT

Steve Litt

Mass bug filing: use and misuse of dbus-launch (dbus-x11)

[Jonathan de Boyne Pollard]

Simon McVittie:

This can already work. If you put XDG_RUNTIME_DIR in user programs' 
environment, and arrange for your favourite service manager to make a 
dbus-daemon (or something else that speaks the same protocol) listen 
on $XDG_RUNTIME_DIR/bus before any user process would try to connect 
to it, then modern versions of at least libdbus, GDBus and sd-bus will 
connect to it by default with no additional effort on your part. This 
client-side code path does not depend on systemd, does not depend on 
libsystemd (except obviously sd-bus which is part of libsystemd), and 
is compiled in for all supported Unix platforms.


That's the problem.  No the whole unix:runtime=yes mechanism is not.  As 
I said, this is something that you and Joe Marcus Clarke and whomever 
else have to sort out with each other.  I'm unfortunately stuck in the 
middle, here.  Please do whatever it is that you need to do with each 
other to make your program understand address=systemd: and 
address=unix:runtime=yes on FreeBSD/TrueOS/OpenBSD.  It does not do so.


Simon McVittie:

Meanwhile, if you want the relevant integration files (your favourite 
service manager's equivalent of systemd units) to be part of dbus (the 
reference implementation of D-Bus), please propose tested patches; if 
they follow the "user session" model[1], they could eventually go in 
dbus-user-session.deb, with its dependencies changed from the current 
systemd-sysv to "systemd-sysv | your-service-manager".


Kudos for being the first project to offer integration, ever. (-:  Yes, 
down the road it would be marvellous if people included service bundles 
in their own projects.  Yes, I'd like to see the day when the number of 
service bundles in the nosh-bundles package actually starts going down, 
because people are taking on shipping their own service bundles for 
their own services, instead of going up.  So yes, eventually you'll be 
taken up on that offer I hope. But one step at a time.


Simon McVittie:

As for what I would like, I'd like you (where that's plural, 
including Joe Marcus Clarke or whomever else) to please make either 
address=systemd: or address=unix:runtime=yes work in your program on 
FreeBSD/PC-BSD/OpenBSD.


To the best of my knowledge, the listenable address "unix:runtime=yes" 
(as in "dbus-daemon --address=unix:runtime=yes") does work on generic 
Unix, and should interoperate fine with the XDG_RUNTIME_DIR/bus 
fallback used by clients with no DBUS_SESSION_BUS_ADDRESS. It is 
compiled and tested whenever DBUS_UNIX is defined (i.e. everything 
except Windows), and I haven't seen bug reports about that test failing.


There you go, then.  New knowledge.  (-:  It doesn't work with your 
program as ported to FreeBSD/TrueOS/OpenBSD.  Joe Marcus Clarke is the 
porter for FreeBSD, according to the port information, and Antoine 
Jacoutot the porter for OpenBSD.  This is why I am saying that it's 
something that you (plural, remember) need to sort out amongst 
yourselves.  We users stuck in the middle cannot use address=systemd: 
and address=unix:runtime=yes with your program on these systems.  As I 
said, it's something that I had to fix in November 2015, to stop trying 
to use address=systemd: on FreeBSD/TrueOS because it turned out that it 
didn't actually work.  I thought that address=unix:runtime=yes might, 
but that did not either.


Simon McVittie:

I am *not* going to go looking for patches on display at the bottom of 
a locked filing cabinet stuck in a disused lavatory with a sign on the 
door saying "beware of the leopard";


Luckily, you didn't need to.  The page that I hyperlinked before pointed 
directly to Pierre-Yves Ritschard's and Cameron T. Norman's actual code, 
even down to positioning the window around the first lines of the 
functions.   Now if one *did* want to follow the Debian way of having 
mention of these things buried down in the depths, in a bug report from 
years ago, then this is a truly excellent example of the genre that one 
could enjoy.  One should begin with Cameron T. Norman's post here, 
roughly one thousand eight hundred messages down, in a bug report from 3 
years ago: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=727708#1859 (-:


Simon McVittie:

To be brutally honest, there is a fairly low limit to how much benefit 
I can create by giving new things to PC-BSD users, [...]


That's not the right way to look at it.  You yourself have just said 
several times that this is stuff that is supposed to be on "supported 
Unix platforms".  This isn't giving new things to anyone.  This is 
making existing things, that you yourself think are existing, work.


I shouldn't dismiss PC-BSD so readily, if I were you, either. PC-BSD 
(now rebranded as TrueOS Desktop a few days ago -- I just got through 
changing a whole load of preset file and -run package names.) is the BSD 
that comes in the box with the desktop environments and with all of the 
desktop programs that use Desktop Bus.  Yes, people can and do run