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Re: How to prevent rtkit from giving firefox higher priority?

From hw <hw@adminart.net>
Newsgroups linux.debian.user
Subject Re: How to prevent rtkit from giving firefox higher priority?
Date 2024-01-17 15:10 +0100
Message-ID <HXeM9-3Imn-11@gated-at.bofh.it> (permalink)
References (6 earlier) <HWRmx-3tXg-3@gated-at.bofh.it> <HWRwd-3u0I-1@gated-at.bofh.it> <HWRZf-3ubw-5@gated-at.bofh.it> <HXblf-3Gda-3@gated-at.bofh.it> <HXddn-3Hju-1@gated-at.bofh.it>
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On Wed, 2024-01-17 at 07:26 -0500, Greg Wooledge wrote:
> On Wed, Jan 17, 2024 at 11:19:50AM +0100, hw wrote:
> > On Tue, 2024-01-16 at 08:41 -0500, Greg Wooledge wrote:
> > > On Tue, Jan 16, 2024 at 02:17:05PM +0100, hw wrote:
> > > > On Tue, 2024-01-16 at 08:03 -0500, Greg Wooledge wrote:
> > > > > On Tue, Jan 16, 2024 at 01:43:23PM +0100, hw wrote:
> > > > > > There's only a bunch of links in that directory, apparently all
> > > > > > pointing to files that don't exist.  Don't you have that?
> > > > > 
> > > > > unicorn:~$ ls -l /run/user/1000/systemd/units
> > > > > total 0
> > > > > lrwxrwxrwx 1 greg greg 32 Jan  4 10:33 invocation:at-spi-dbus-bus.service -> bfec6466520a4586b8c9205c235ccc92
> 
> > > You can access it just fine.  You just don't *understand* it.  (Neither
> > > do I.)
> > 
> > If I could access it, I could display the file.  If there is no file,
> > then these directory entries shouldn't exist.
> 
> I don't know how to make it any clearer.  THE SYMBOLIC LINK TARGET IS
> THE CONTENT.  They are storing this "Invocation ID" inside the symbolic
> link itself.
>
> This is what they chose to do.  I don't know WHY.  But you can clearly
> see what they're doing.

I can only see links to files that don't exist.

> > > I did a bit of Google searching, and I think this is something called
> > > an "InvocationID".
> > > 
> > > > > lrwxrwxrwx 1 greg greg 32 Jan  4 10:33 invocation:at-spi-dbus-bus.service -> bfec6466520a4586b8c9205c235ccc92
> > > 
> > > unicorn:~$ systemctl --user show -p InvocationID at-spi-dbus-bus.service
> > > InvocationID=bfec6466520a4586b8c9205c235ccc92
> > 
> > That is not useful:
> > 
> > 
> > systemctl --user show -p InvocationID at-spi-dbus-bus.service InvocationID=4bd113a0ec4c4f1eab6c51da8a43c1af
> > Invalid unit name "InvocationID=4bd113a0ec4c4f1eab6c51da8a43c1af" escaped as "InvocationID\x3d4bd113a0ec4c4f1eab6c51da8a43c1af" (maybe you should use systemd-escape?).
> > InvocationID=b6e84c2dd18b4d9f84436580113abaca
> > 
> > InvocationID=
> 
> What were you trying to do?  You took my command and mangled it.  You
> appended the *output* of my command as an *argument* to your command,
> substituting my 128-bit InvocationID with one of your own.  Why?

I copied your command and replaced the UUID with one that shows up in
/run/user/1000/systemd/units/ as a link target since it seems unlikely
that the same UUIDs you have are being used here..  At least that was
my intention.

Maybe your command was supposed to be 'systemctl --user show -p
InvocationID at-spi-dbus-bus.service'?  That shows only


InvocationID=b6e84c2dd18b4d9f84436580113abaca


which doesn't tell me anything.

> > Neither the user, nor root gets anything from this.  What is it
> > supposed to show?
> 
> You got the InvocationID of the at-spi-dbus-bus.service unit.  You
> also got an error message because of the mangled argument you passed,
> and an extra blank InvocationID= line as output from that same mangled
> argument, because it wasn't a running unit's name.
> 
> When I ran *my* command, I was simply demonstrating that the "systemctl"
> command, when asked for the InvocationID of a unit, gives the same
> 128-bit number that you can see with ls -l.
> 
> That's all.  Nothing more complicated than that.

How would that be useful?

> THE 128-BIT HEX NUMBER IS THE CONTENT.  IT IS THE DATA.  IT IS WHAT YOU
> SEEM TO BE LOOKING FOR.  THAT'S ALL THERE IS.  THERE IS NO ADDITIONAL
> PAYLOAD TO BE FOUND.
> 
> THE SYMBOLIC LINKS ARE *SUPPOSED* TO BE DANGLING.  THEY ARE NOT MEANT
> TO BE catTED.

If that is so, what is the purpose of useless directory entries?

> > > Maybe it's just a fancy PID?  I dunno, it's all very shrouded in mystery.
> > 
> > See, you're starting to understand how this is alarming :)
> 
> If you want to know what the InvocationID IS USED FOR, ask on the
> systemd mailing lists, because clearly we don't know.

That may be a good idea.

> If you want to know WHY they chose to store the InvocationID inside
> the target of a symbolic link, instead of as regular file content,
> ask on the systemd mailing lists, because clearly we don't know.
> 
> If you want to know why things that you've never seen before are
> alarming to you, ask your therapist, because... well, you get the picture,
> I hope.
> 

Unknown things never seen before are always alarming.  There may not
be any therapist able to help you if they aren't alarming to you.

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Thread

How to prevent rtkit from giving firefox higher priority? hw <hw@adminart.net> - 2024-01-15 19:50 +0100
  Re: How to prevent rtkit from giving firefox higher priority? <tomas@tuxteam.de> - 2024-01-15 20:30 +0100
    Re: How to prevent rtkit from giving firefox higher priority? hw <hw@adminart.net> - 2024-01-15 21:40 +0100
      Re: How to prevent rtkit from giving firefox higher priority? Tom Furie <tom@furie.org.uk> - 2024-01-15 22:10 +0100
        Re: How to prevent rtkit from giving firefox higher priority? Anssi Saari <anssi.saari@debian-user.mail.kapsi.fi> - 2024-01-16 11:30 +0100
        Re: How to prevent rtkit from giving firefox higher priority? Michel Verdier <mv524@free.fr> - 2024-01-16 13:10 +0100
      Re: How to prevent rtkit from giving firefox higher priority? <tomas@tuxteam.de> - 2024-01-16 07:00 +0100
        Re: How to prevent rtkit from giving firefox higher priority? hw <hw@adminart.net> - 2024-01-16 11:30 +0100
          Re: How to prevent rtkit from giving firefox higher priority? Greg Wooledge <greg@wooledge.org> - 2024-01-16 13:10 +0100
            Re: How to prevent rtkit from giving firefox higher priority? hw <hw@adminart.net> - 2024-01-16 13:50 +0100
              Re: How to prevent rtkit from giving firefox higher priority? Greg Wooledge <greg@wooledge.org> - 2024-01-16 14:10 +0100
                Re: How to prevent rtkit from giving firefox higher priority? hw <hw@adminart.net> - 2024-01-16 14:20 +0100
                Re: How to prevent rtkit from giving firefox higher priority? hw <hw@adminart.net> - 2024-01-16 14:40 +0100
                Re: How to prevent rtkit from giving firefox higher priority? Greg Wooledge <greg@wooledge.org> - 2024-01-16 14:50 +0100
                Re: How to prevent rtkit from giving firefox higher priority? hw <hw@adminart.net> - 2024-01-17 11:30 +0100
                Re: How to prevent rtkit from giving firefox higher priority? Tixy <tixy@yxit.co.uk> - 2024-01-17 13:30 +0100
                Re: How to prevent rtkit from giving firefox higher priority? hw <hw@adminart.net> - 2024-01-17 14:50 +0100
                Re: How to prevent rtkit from giving firefox higher priority? <tomas@tuxteam.de> - 2024-01-17 15:20 +0100
                Re: How to prevent rtkit from giving firefox higher priority? Greg Wooledge <greg@wooledge.org> - 2024-01-17 13:30 +0100
                Re: How to prevent rtkit from giving firefox higher priority? hw <hw@adminart.net> - 2024-01-17 15:10 +0100
                Re: How to prevent rtkit from giving firefox higher priority? The Wanderer <wanderer@fastmail.fm> - 2024-01-17 15:20 +0100
                Re: How to prevent rtkit from giving firefox higher priority? David Wright <deblis@lionunicorn.co.uk> - 2024-01-18 06:10 +0100
  Re: How to prevent rtkit from giving firefox higher priority? hw <hw@adminart.net> - 2024-01-15 21:00 +0100
    Re: How to prevent rtkit from giving firefox higher priority? <tomas@tuxteam.de> - 2024-01-15 21:10 +0100
      Re: How to prevent rtkit from giving firefox higher priority? hw <hw@adminart.net> - 2024-01-16 10:50 +0100
        Re: How to prevent rtkit from giving firefox higher priority? Arno Lehmann <al@its-lehmann.de> - 2024-01-16 11:30 +0100
          Re: How to prevent rtkit from giving firefox higher priority? hw <hw@adminart.net> - 2024-01-16 12:00 +0100
            Re: How to prevent rtkit from giving firefox higher priority? Tom Furie <tom@furie.org.uk> - 2024-01-16 12:50 +0100
            Re: How to prevent rtkit from giving firefox higher priority? debian-user@howorth.org.uk - 2024-01-16 13:20 +0100
              Re: How to prevent rtkit from giving firefox higher priority? hw <hw@adminart.net> - 2024-01-16 14:00 +0100
    Re: How to prevent rtkit from giving firefox higher priority? John Hasler <john@sugarbit.com> - 2024-01-15 22:30 +0100
      Re: How to prevent rtkit from giving firefox higher priority? hw <hw@adminart.net> - 2024-01-16 10:50 +0100
        Re: How to prevent rtkit from giving firefox higher priority? John Hasler <john@sugarbit.com> - 2024-01-16 17:20 +0100
          Re: How to prevent rtkit from giving firefox higher priority? hw <hw@adminart.net> - 2024-01-17 14:20 +0100

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