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#1 2012-08-22 13:58:51

sediment
Member
Registered: 2012-08-01
Posts: 14

Conditional auto-login?

I'm not altogether sure that this is in the right forum, but I don't know where would be more appropriate for it.

I'd like to arrange for Arch to automatically log in to a particular account on boot, but only if a certain condition is met. (To be specific, I'd like it to log in only if there isn't a keyboard plugged into the computer. My reason for doing this is that I make electronic music with my computer, and I'd like to be able to set it up at concerts just by turning it on, without needing to connect a keyboard (or monitor, or mouse...))

Does anyone know whether this is possible, or how I would go about doing it, if so? Incidentally, I've already figured out some bash code to check if the keyboard is present or not. I just have no idea where to put this so that it will then be able to login for me.

Thanks in advance.

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#2 2012-08-22 14:03:52

Trilby
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From: Massachusetts, USA
Registered: 2011-11-29
Posts: 14,001
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Re: Conditional auto-login?

Do you mean log in to a different WM/DE (or none at all), or do you mean log in as a different user account?

If you're looking for the former, check out this thread.

If you want the latter, I don't have any great ideas, but one kludge that would work is to autologin to any user you'd like: root would work, or create an additional user just for this purpose.  In that user's bashrc you can have your code to test for the keyboard and run an `exec login ...` command passing the appropriate username and arguments.

Last edited by Trilby (2012-08-22 14:04:25)


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#3 2012-08-22 14:13:46

sediment
Member
Registered: 2012-08-01
Posts: 14

Re: Conditional auto-login?

I should have specified that it's the latter. I don't want to log in to X or any kind of window manager, just into the shell, on one of the ttys, I guess. I'll have a few scripts to execute in the .bashrc. Your kludge seems feasible - may give it a try, but seems like this would disturb my normal login procedure for other purposes?

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#4 2012-08-22 14:15:22

Trilby
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From: Massachusetts, USA
Registered: 2011-11-29
Posts: 14,001
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Re: Conditional auto-login?

You can put it all in a conditional block to test which tty it is on, and that it is not in X - so that all this only runs when you want it to, and is ignored in other situations.


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#5 2012-08-22 14:26:18

sediment
Member
Registered: 2012-08-01
Posts: 14

Re: Conditional auto-login?

Oh, I see. I was misunderstanding you at first. I think something like your method should work - I just didn't spot that you could set up inittab to log in to accounts on a per-tty basis. I think I'll try having the account always autologin on tty6 or whatever, then do its conditional checks, and either proceed or logout (or perhaps just do nothing) accordingly. Thanks.

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