[DNG] Multi-seat on Devuan, do we actually need that useless curiosity?

2015-07-22 Thread Vlad
I think that the pretty useless feature which helped systemd into Debian in the 
first place was discussed some time ago.
As you might know multi seat is supposed  to make possible for multiple users 
to utilize a single desktop or laptop system in full blown GUI mode via special 
USB  hubs, the main selling point of this curiosity was as a way to run schools 
in 3rd world countries.
However these extension hubs actually cost more than a Raspberry Pi, and the Pi 
has the extra selling point that the student can take it home and use it there.
I do not see any real need for silly things like multi seat and with every 
nanometer less and every new cell phone the price and power consumption per Ghz 
falls.
There is also the cloud and BIOD to consider, as well as laptops and tablets.
In my opinion 99+% of users really won't care about this curiosity, which is a 
cool concept with less and less actual relevance or practical purpose behind it 
with every passing day.
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Re: [DNG] Multi-seat on Devuan, do we actually need that useless curiosity?

2015-07-22 Thread James Powell
There is ConsoleKit2...

From: Vlad<mailto:2389...@gmail.com>
Sent: ‎7/‎22/‎2015 5:49 PM
To: dng@lists.dyne.org<mailto:dng@lists.dyne.org>
Subject: [DNG] Multi-seat on Devuan, do we actually need that useless curiosity?

I think that the pretty useless feature which helped systemd into Debian in the 
first place was discussed some time ago.
As you might know multi seat is supposed  to make possible for multiple users 
to utilize a single desktop or laptop system in full blown GUI mode via special 
USB  hubs, the main selling point of this curiosity was as a way to run schools 
in 3rd world countries.
However these extension hubs actually cost more than a Raspberry Pi, and the Pi 
has the extra selling point that the student can take it home and use it there.
I do not see any real need for silly things like multi seat and with every 
nanometer less and every new cell phone the price and power consumption per Ghz 
falls.
There is also the cloud and BIOD to consider, as well as laptops and tablets.
In my opinion 99+% of users really won't care about this curiosity, which is a 
cool concept with less and less actual relevance or practical purpose behind it 
with every passing day.
--
Sent from my Android device with K-9 Mail. Please excuse my brevity.
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Re: [DNG] Multi-seat on Devuan, do we actually need that useless curiosity?

2015-07-22 Thread Isaac Dunham
On Thu, Jul 23, 2015 at 03:49:32AM +0300, Vlad wrote:
> I think that the pretty useless feature which helped systemd into Debian in 
> the first place was discussed some time ago.
> As you might know multi seat is supposed  to make possible for multiple users 
> to utilize a single desktop or laptop system in full blown GUI mode via 
> special USB  hubs, the main selling point of this curiosity was as a way to 
> run schools in 3rd world countries.
> However these extension hubs actually cost more than a Raspberry Pi, and the 
> Pi has the extra selling point that the student can take it home and use it 
> there.
> I do not see any real need for silly things like multi seat and with every 
> nanometer less and every new cell phone the price and power consumption per 
> Ghz falls.
> In my opinion 99+% of users really won't care about this curiosity, which is 
> a cool concept with less and less actual relevance or practical purpose 
> behind it with every passing day.

Somehow it seems to me like someone trying to reinvent the dumb terminal,
but with less distance possible.
I could imagine one situation where it makes sense:
 $site is running commercial software for x86{,_64}, licensed on a per-
 processor basis with multiple users permitted; said commercial software
 requires a decent processor but not much GPU.

Other than that, I can't picture a use.

All that said, I *can* picture a way to implement it using X(fbdev?) and
perhaps mdev (which I thought about not long ago...):
- *disable* input device hotplug in X11
- keyboards get renamed /dev/input/kbd$N, like how mice are named
- for new keyboards, mice, and framebuffer/drm nodes, run a helper
  script that will spawn an X11 login if the appropriate devices exist
  for the current $N.
You could even use hard links, bind mounts, and unshare to make
restricted containers for different users.
(I'm thinking of putting hard links to the device in /dev/seat$N/, but
with normal naming conventions under that. Then each seat gets a new
mount namespace and a private bind-mount over /dev.)

In theory, that should be a pretty small amount of work.
But I don't have any hardware suitable for testing, and don't feel that
it really justifies getting said hardware.

Thanks,
Isaac Dunham
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Re: [DNG] Multi-seat on Devuan, do we actually need that useless curiosity?

2015-07-22 Thread T.J. Duchene





On Thu, Jul 23, 2015 at 03:49:32AM +0300, Vlad wrote:




However these extension hubs actually cost more than a Raspberry Pi, and the Pi 
has the extra selling point that the student can take it home and use it there.
I do not see any real need for silly things like multi seat and with every 
nanometer less and every new cell phone the price and power consumption per Ghz 
falls.
In my opinion 99+% of users really won't care about this curiosity, which is a 
cool concept with less and less actual relevance or practical purpose behind it 
with every passing day.


Just my 2 cents

What I am about to say is not a judgement on you, but just because you might 
not find a feature useful does not mean that someone else doesn't. Perhaps the 
majority of the Linux programmer culture does not, but that does not mean that 
it is never used.  Multi-seat logins are very useful in situations where users 
do not understand how to run X11 applications with different user permissions.  
It is an easy mechanism that is familiar to users from other systems coming 
over to Linux. You don't have to have it installed on your copy, but having an 
option is not a bad thing.



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Re: [DNG] Multi-seat on Devuan, do we actually need that useless curiosity?

2015-07-22 Thread miro . rovis
On Wed, Jul 22, 2015 at 11:39:23PM -0500, T.J. Duchene wrote:
> >On Thu, Jul 23, 2015 at 03:49:32AM +0300, Vlad wrote:
> Multi-seat logins are very useful in situations where users do not
> understand how to run X11 applications with different user
> permissions.
I guess so.
> It is an easy mechanism that is familiar to users from
> other systems coming over to Linux.
Fine...
> You don't have to have it installed on your copy,
Intrinsically and absolutely important. I won't have'em in my copy! And
if I get to teach newbies Grsec for Devuan, if Devuan gets fully-foss
(in the terms of true freedom, such as SELinux, the spy-tool, certainly
is not) or close enough to, as I hope (see the MirDevuan "WTF" thread
too currently being contributed to), I will always recommend against
multiseat too.
> but having an option is not a bad thing.
In controlled (I mean user controlled) cases, fine!

Because, prove me wrong. Often the surveillors most used tools, since
otherwise they wouldn't be able to follow their targets, is exactly
multiseats.

They see, sitting in their bunkers, which public at large has mostly
never any notion about, and thanks to stuff like dbus, multiseat,
pulseaudio (pulsoaudio was designed by those tools of the
one-Ring-cravers for eavesdropping!), and surely systemd goes to
perfection in bulk collection and worse!...

They see, sitting in their bunkers, their target's every move, every
move! On their screen, replicated what the torget does. In real time!
And most of them wouldn't be able to follow their targets without such
aides, because they're not all experts, really.

A little harder following their tagets without any poetterware.

A disclaimer: fine, the spies following targets, fine! When we really
talk terrorists and criminals, you should follow those, I approve of
that! But for the love of God, not wholesale surveillance on the general
population, please!

Regards!

-- 
Miroslav Rovis
Zagreb, Croatia
http://www.CroatiaFidelis.hr


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Re: [DNG] Multi-seat on Devuan, do we actually need that useless curiosity?

2015-07-23 Thread T.J. Duchene



On 7/23/2015 12:01 AM, miro.ro...@croatiafidelis.hr wrote:

Because, prove me wrong.
Miro,  I truly wish you well, but feel no need to prove anything to you. 
:-)


Often the surveillors most used tools, since otherwise they wouldn't 
be able to follow their targets, is exactly multiseats. They see, 
sitting in their bunkers, which public at large has mostly never any 
notion about, and thanks to stuff like dbus, multiseat, pulseaudio 
(pulsoaudio was designed by those tools of the one-Ring-cravers for 
eavesdropping!), and surely systemd goes to perfection in bulk 
collection and worse!...


They see, sitting in their bunkers, their target's every move, every 
move! On their screen, replicated what the torget does. In real time! 
And most of them wouldn't be able to follow their targets without such 
aides, because they're not all experts, really. A little harder 
following their tagets without any poetterware. A disclaimer: fine, 
the spies following targets, fine! When we really talk terrorists and 
criminals, you should follow those, I approve of that! But for the 
love of God, not wholesale surveillance on the general population, 
please! Regards! 



The reason we prefer FOSS to proprietary code is that the source code is 
open.  You should never infer such things about other people and their 
contributions to FOSS without proof, which you can easily get.  If you 
have proof of these things, please post the relevant portions of the 
source code so that I might see these things, and offer you my deepest 
thanks.  Until you have real proof, baseless rumor and innuendo damage 
people's reputations for no reason.  It is wrong, and it is in very poor 
taste.  Without proof, no one will take you seriously, and rightly so.


Be well, Miro.



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Re: [DNG] Multi-seat on Devuan, do we actually need that useless curiosity?

2015-07-23 Thread miro . rovis
Is it because you send from (pasting from your header):

Mozilla/5.0 (Windows NT 6.3; WOW64; rv:38.0) Gecko/20100101
Thunderbird/38.1.0

or is it for some other reason (or for both or/and other reasons yet),
who can tell?

But...
> 
> 
> On 7/23/2015 12:01 AM, miro.ro...@croatiafidelis.hr wrote:
> >Because, prove me wrong.
> Miro,  I truly wish you well, but feel no need to prove anything to you. :-)
>
If you are developing for the public who want to use Free Open Source
Software, you may need to be at least kind, not in such attempted
condiscending protecting fashion like the line above would want to
sound, but sincerely kind, at least to some extent, and also truthful in
recognizing actual arguments put to you regarding the software they you
want to develop, or develop with, and which they want to use.
> >Often the surveillors most used tools, since otherwise they wouldn't be
> >able to follow their targets, is exactly multiseats. They see, sitting in
> >their bunkers, which public at large has mostly never any notion about,
> >and thanks to stuff like dbus, multiseat, pulseaudio (pulsoaudio was
> >designed by those tools of the one-Ring-cravers for eavesdropping!), and
> >surely systemd goes to perfection in bulk collection and worse!...
> >
[Remember the "But... " above. My Mutt showing me this, from the
Thunderbird GUI that T.J. Duchene uses, mangled, and I don't see it
displayed clearly on:
https://lists.dyne.org/lurker/message/20150723.073512.9673917a.en.html
either...
> >They see, sitting in their bunkers, their target's every move, every move!
> >On their screen, replicated what the torget does. In real time! And most
> >of them wouldn't be able to follow their targets without such aides,
> >because they're not all experts, really. A little harder following their
> >tagets without any poetterware. A disclaimer: fine, the spies following
> >targets, fine! When we really talk terrorists and criminals, you should
> >follow those, I approve of that! But for the love of God, not wholesale
> >surveillance on the general population, please! Regards!
> 
> 
> The reason we prefer FOSS to proprietary code is that the source code is
> open.  You should never infer such things about other people and their
> contributions to FOSS without proof, which you can easily get.
What proof? That there exists mass surveillance by most all big subjects
that can afford it? You need proofs for that?

That the RPC in dbus are made so that the programs in unixdom could work
with proprietory programs? I'm really no expert on this one, but I did
remember it well when a programmer complained about it. And I simply
believed. Just like I believe Jude C. Nelson when he said no need of
dbus for vdev (which I must repeat, is great to know!).

> If you have proof of these things, please post the relevant portions
> of the source code so that I might see these things, and offer you my
> deepest thanks.
Again, what proofs? That there is bulk data collection?

And if there is bulk data collection, the new term, previous term: mass
surveillance... If is it there, and I don't think you can denied that
there is, then:

Do you really really think they wouldn't want to get into all of unixdom
like they have in their pocket everything, I mean everything (and I'm
only citing Edward Snowden, the American hero), all of appledom and all
of M$ windillidillidom.

Do you really really think they wouldn't get their f**ing tools (only
citing Christopher Barry, find the link on, wait, I'll copy it from
there:
ttp://lkml.org/lkml/2014/8/12/459 
(copied from:
https://lists.dyne.org/lurker/message/20150722.143942.1c1b286a.en.html
))
Do you really really think they wouldn't get their tools (Poettering,
Sievers and cameraderie), to work, and work hard to open the unixdom to
them like the appledom and windillidillidom? (Sorry I really hate
windoze).  What do you think they pay them such money for? To make the
world freeer and nicer? Or to serve their one-ring-to-rule-them-all
purposes?
> Until you have real proof, baseless rumor and innuendo damage people's
> reputations for no reason.  It is wrong, and it is in very poor taste.
> Without proof, no one will take you seriously, and rightly so.
>
Poor taste is Windoze, and overwhelmed in such poor taste, you have
difficulty understanding my arguments. Maybe because you don't want to
admit the truth.

Poor taste is Windoze, if we know history, and many in Devuan do, and
always will, I hope. How much has that Billy the bandit (morally so),
turned (of recent) eugenic philantropist, made this world a more stupid
and less free place... (I mean Bill Gates if someone is in doubt).

Is it that you have no access to a *nix OS, or is it why? Do you like
Windoze?  How can someone like Windoze and develop in Linux, I sincerely
don't understand that.
> Be well, Miro.
>
I'm well. I'm afraid you are not, as there is no goodness in what you
use, and something could be very disharmonious in that for you and for
Devuan.

Re: [DNG] Multi-seat on Devuan, do we actually need that useless curiosity?

2015-07-23 Thread KatolaZ
On Thu, Jul 23, 2015 at 10:54:06AM +0200, miro.ro...@croatiafidelis.hr wrote:
> Is it because you send from (pasting from your header):
> 
> Mozilla/5.0 (Windows NT 6.3; WOW64; rv:38.0) Gecko/20100101
> Thunderbird/38.1.0
> 
> or is it for some other reason (or for both or/and other reasons yet),
> who can tell?
> 
> But...
> > 
> > 
> > On 7/23/2015 12:01 AM, miro.ro...@croatiafidelis.hr wrote:
> > >Because, prove me wrong.
> > Miro,  I truly wish you well, but feel no need to prove anything to you. :-)
> >
> If you are developing for the public who want to use Free Open Source
> Software, you may need to be at least kind, not in such attempted
> condiscending protecting fashion like the line above would want to
> sound, but sincerely kind, at least to some extent, and also truthful in
> recognizing actual arguments put to you regarding the software they you
> want to develop, or develop with, and which they want to use.

Guys, I have serious problems understanding what is the point of this
thread, really. And lenghty emails with many interleaving, fragmented
discussions and cross-quoting from several different sources are far
from helpful.

I am wondering whether we shall eventually decide to adopt a proper
netiquette for this ML...

HND

KatolaZ

-- 
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Re: [DNG] Multi-seat on Devuan, do we actually need that useless curiosity?

2015-07-23 Thread T.J. Duchene
> Guys, I have serious problems understanding what is the point of this thread,
> really. And lenghty emails with many interleaving, fragmented discussions
> and cross-quoting from several different sources are far from helpful.

Hi KatolaZ!

I assure you it was never my intention to offend anyone, including Miro.  If I 
have done so, then I apologize not only to you and Miro but to everyone for my 
part.  I admit I was slightly annoyed but meant only to very politely suggest 
that Miro tone it down a little.  My best wishes to him (or her) are entirely 
sincere.  Honestly, I did not expect problems.  I feel like I have walked into 
a bear trap.  =P   This might sound silly and naïve to you, but I genuinely do 
not comprehend animosity at times.  
 
> I am wondering whether we shall eventually decide to adopt a proper
> netiquette for this ML...

I quite agree. I will leave this discussion abandoned and not feed it.

I wish you boys a wonderful evening.

T.J.


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Re: [DNG] Multi-seat on Devuan, do we actually need that useless curiosity?

2015-07-23 Thread KatolaZ
On Thu, Jul 23, 2015 at 05:05:52AM -0500, T.J. Duchene wrote:
> > Guys, I have serious problems understanding what is the point of this 
> > thread,
> > really. And lenghty emails with many interleaving, fragmented discussions
> > and cross-quoting from several different sources are far from helpful.
> 
> Hi KatolaZ!
> 
> I assure you it was never my intention to offend anyone, including Miro.  If 
> I have done so, then I apologize not only to you and Miro but to everyone for 
> my part.  I admit I was slightly annoyed but meant only to very politely 
> suggest that Miro tone it down a little.  My best wishes to him (or her) are 
> entirely sincere.  Honestly, I did not expect problems.  I feel like I have 
> walked into a bear trap.  =P   This might sound silly and naïve to you, but I 
> genuinely do not comprehend animosity at times.  


Hi, 

my point was that by reading the thread, made by lengthy and
fragmented emails charcaterised by cross-quoting, top-quoting, and
bad-quoting, it was actually *impossible* for me to understand what
the thread was really about, and far harder to get if anybody had made
any good suggestion or had the intention to offend or attack anybody
else :D

If you have offended me or anybody else, I haven't had the opportunity
to notice it by reading those emails. And I have not been able to
discern if there were any good technical points made, or any good idea
or proposal either. 


>  
> > I am wondering whether we shall eventually decide to adopt a proper
> > netiquette for this ML...
> 
> I quite agree. I will leave this discussion abandoned and not feed it.
> 
> I wish you boys a wonderful evening.
> 

It was not my intention to urge for the thread to be terminated,
rather to ask the participants to be considerate in quoting and
replying. Otherwise the most likely result you obtain is just being
ignored and some (maybe good) points going unnoticed, and that would
be a shame.

My2Cents

KatolaZ

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Re: [DNG] Multi-seat on Devuan, do we actually need that useless curiosity?

2015-07-23 Thread Teodoro Santoni
Good morning,

On Wed, Jul 22, 2015 at 11:39:23PM -0500, T.J. Duchene wrote:
>[snip]
>Multi-seat logins are very useful in situations where users do not understand 
>how to run X11 applications with different user permissions.  It is an easy 
>mechanism that is familiar to users from other systems coming over to Linux. 
>You don't have to have it installed on your copy, but having an option is not 
>a bad thing.
> 

May you expand with an example? I'm truly curious about this argument.
Prior this day, I just thought it was a nonsense excuse to create an entire 
bizantine framework (CK, PolK) to impede me to shut off my machine from inside 
X. I'm not trolling.
If you deem it useful, it probably is, so I wish to learn more about 
multi-seat logins.
I thank you and anybody who will spend some time educating me about this 
argument.

--
Teodoro Santoni

Something is wrong. I don't wanna compile 20 KB of Go code to list files.
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Re: [DNG] Multi-seat on Devuan, do we actually need that useless curiosity?

2015-07-23 Thread Fernando M. Maresca


On Thu, Jul 23, 2015 at 03:49:32AM +0300, Vlad wrote:
> I think that the pretty useless feature which helped systemd into Debian in 
> the
> first place was discussed some time ago.

Better footprint, less power consumption.

I rutinelly do two and three seat ws without any expensive usb hub: a
us$5 usb hub can manage two pairs of keyboard and mouse, and most mb
these days have 6 usb ports. lightdm and xfce4 play nice in these
config. 

cheers,

-- 
Fernando M. Maresca
- - - - - - - - - - - - -
Cel: 221 15 545 8196
Tel: 221 450 5378
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Re: [DNG] Multi-seat on Devuan, do we actually need that useless curiosity?

2015-07-23 Thread Vlad
Yeah, but that is why we have VNC for.
As I said, multiseat is pretty much useless.
Hell, the proprietary software can be installed on a server and run from
anywhere.
On Jul 23, 2015 6:32 AM, "Isaac Dunham"  wrote:

> On Thu, Jul 23, 2015 at 03:49:32AM +0300, Vlad wrote:
> > I think that the pretty useless feature which helped systemd into Debian
> in the first place was discussed some time ago.
> > As you might know multi seat is supposed  to make possible for multiple
> users to utilize a single desktop or laptop system in full blown GUI mode
> via special USB  hubs, the main selling point of this curiosity was as a
> way to run schools in 3rd world countries.
> > However these extension hubs actually cost more than a Raspberry Pi, and
> the Pi has the extra selling point that the student can take it home and
> use it there.
> > I do not see any real need for silly things like multi seat and with
> every nanometer less and every new cell phone the price and power
> consumption per Ghz falls.
> > In my opinion 99+% of users really won't care about this curiosity,
> which is a cool concept with less and less actual relevance or practical
> purpose behind it with every passing day.
>
> Somehow it seems to me like someone trying to reinvent the dumb terminal,
> but with less distance possible.
> I could imagine one situation where it makes sense:
>  $site is running commercial software for x86{,_64}, licensed on a per-
>  processor basis with multiple users permitted; said commercial software
>  requires a decent processor but not much GPU.
>
> Other than that, I can't picture a use.
>
> All that said, I *can* picture a way to implement it using X(fbdev?) and
> perhaps mdev (which I thought about not long ago...):
> - *disable* input device hotplug in X11
> - keyboards get renamed /dev/input/kbd$N, like how mice are named
> - for new keyboards, mice, and framebuffer/drm nodes, run a helper
>   script that will spawn an X11 login if the appropriate devices exist
>   for the current $N.
> You could even use hard links, bind mounts, and unshare to make
> restricted containers for different users.
> (I'm thinking of putting hard links to the device in /dev/seat$N/, but
> with normal naming conventions under that. Then each seat gets a new
> mount namespace and a private bind-mount over /dev.)
>
> In theory, that should be a pretty small amount of work.
> But I don't have any hardware suitable for testing, and don't feel that
> it really justifies getting said hardware.
>
> Thanks,
> Isaac Dunham
>
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Re: [DNG] Multi-seat on Devuan, do we actually need that useless curiosity?

2015-07-23 Thread T.J. Duchene



On 7/23/2015 5:37 AM, Teodoro Santoni wrote:

Good morning,

On Wed, Jul 22, 2015 at 11:39:23PM -0500, T.J. Duchene wrote:

[snip]
Multi-seat logins are very useful in situations where users do not understand 
how to run X11 applications with different user permissions.  It is an easy 
mechanism that is familiar to users from other systems coming over to Linux. 
You don't have to have it installed on your copy, but having an option is not a 
bad thing.


May you expand with an example? I'm truly curious about this argument.
Prior this day, I just thought it was a nonsense excuse to create an entire
bizantine framework (CK, PolK) to impede me to shut off my machine from inside
X. I'm not trolling.

If you deem it useful, it probably is, so I wish to learn more about
multi-seat logins.
I thank you and anybody who will spend some time educating me about this 
argument.



Hi Theodoro! =)

It's not an "argument" really, just a difference of opinion.  (To me, an 
"argument" is something quite different.)


UNIX was designed from the beginning to be a multi-user system. That was 
entire reason in creating it, actually.  The concept of "multi-seat" as 
a feature is being able to login and allow multiple users to use the 
same hardware independently. A lot of people would argue that Linux 
already does this, and you don't need a framework for it.  I know this 
and they know it.  It's true.The Linux multi-seat  software provides 
a framework for the easy setup of hotplug devices, X11 logins, 
permissions, and other things that need to be done to easily provide 
access to more than one user.   Yes, you can do all the setup and 
management manually.  Why should you? The whole point of software is to 
spend more time being actually productive, not reinventing the wheel 
because you have to do every step manually.


What I personally do not understand (and what seems to get me into 
trouble) is the animosity toward multi-seat, pulseaudio, or anything 
else for that matter.  I'm not trying to bring old disagreements back 
into the mix, so please let's not go there, ladies and gentlemen.  I 
just want to expound on something that I think is very important when 
discussing multi-seat or anything else in the future.   There are other 
people besides you and me, and who do not have the skill to do these 
things manually.  They do not want to be told "RTFM."  They just want to 
plug the silly thing in and get their work done.  I believe that is 
reasonable and not asking for too much.  If you don't want to use a 
package, you don't have to. Multi-seat, Pulseaudio, and even Systemd are 
nothing more than tools.  If it does not fit the job you are doing, 
don't use it. No one wastes time getting angry about a pipewrench 
because it can't drive in a nail like a hammer.   I hope Devuan enforces 
as few requirements as possible, but leaves room for people who want all 
the bells and whistles - because you want more people using it, not less.


Linux is a very big place and there is plenty of room for everyone to 
play the way that they want to.



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Re: [DNG] Multi-seat on Devuan, do we actually need that useless curiosity?

2015-07-24 Thread tilt!

Hi,

T.J. Duchene wrote on 23/07/2015 at 21:35 CEST:

[...]
UNIX was designed from the beginning to be a multi-user system. That was
entire reason in creating it, actually.  The concept of "multi-seat" as
a feature is being able to login and allow multiple users to use the
same hardware independently. A lot of people would argue that Linux
already does this, and you don't need a framework for it.  I know this
and they know it.  It's true.The Linux multi-seat  software provides
a framework for the easy setup of hotplug devices, X11 logins,
permissions, and other things that need to be done to easily provide
access to more than one user. [...]


To me, "multi-seat" is a marketing term, because beyond the requirement
that there are mulitple seats involved (which makes sense if multiple
users are involved who are in a seated posture), it does not specify
much.

Kind regards,
T.

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