Re: s6/s6-rc policy for Gentoo: user session tracking

2024-07-15 Thread Laurent Bercot

That said, it might be of interest to you, that s6-setlock does not appear 
here: https://skarnet.org/software/s6/index.html.


 Whoops. And nobody noticed that in 13 years? Shame on all of you. :P
 Fixed, thanks!

--
 Laurent



Re: s6/s6-rc policy for Gentoo: user session tracking

2024-07-14 Thread Paul Sopka

 Yes - but since you're using s6 anyway, you also have s6-setlock,
which features more options than flock. ;)

I will happily use s6-setlock!

That said, it might be of interest to you, that s6-setlock does not 
appear here: https://skarnet.org/software/s6/index.html.



I wish you a nice week!


Paul



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Re: s6/s6-rc policy for Gentoo: user session tracking

2024-07-14 Thread Laurent Bercot

Good point. If I understood everything correctly, this can be easily solved by the 
"flock" command, right?


 Yes - but since you're using s6 anyway, you also have s6-setlock,
which features more options than flock. ;)

--
 Laurent



Re: s6/s6-rc policy for Gentoo: user session tracking

2024-07-14 Thread Paul Sopka

These two last points, if you really decide to implement them like that in
the final version, may require some synchronization, e.g. via file locking.
It is not impossible (I mean, it is quite unlikely, but especially with
automated CI systems not impossible *at all*) for two SSH sessions to
come in practically at once, and I have indeed seen shell startup scripts
run the same program at the same time.
Good point. If I understood everything correctly, this can be easily 
solved by the "flock" command, right?



It would be... interesting to have one login session write the first line,
then another session immediately write the second one, and then neither of
them will find exactly one line in the file 🙂 And same for logout.

Indeed.


Have a nice weekend!

Paul



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Re: s6/s6-rc policy for Gentoo: user session tracking

2024-07-14 Thread Peter Pentchev
On Thu, Jul 11, 2024 at 04:53:51PM +0200, Paul Sopka wrote:
> Since I was not 100% convinced by Turnstile, I made an attempt on a very
> simple alternative way to handle user session tracking.
> 
> The (currently very crude) script only runs once on each login and logout
> and does the following:
> 
> On login:
> 
> - Possibly create a /run/session/${USER} directory.
> 
> - Possibly start the user supervision tree (from S6/s6-rc or OpenRC, or
> anything but itself).
> 
> - If it does not exist, create a file named after the login type (e.g. sshd)
> at /run/session/${USER}/${LOGIN_TYPE}.
> 
> - Write a line (any content, but just one line) to
> /run/session/${USER}/${LOGIN_TYPE}.
> 
> - If the line count in /run/session/${USER}/${LOGIN_TYPE} is 1, start the
> bundle corresponding to ${LOGIN_TYPE} e.g. sshd.

These two last points, if you really decide to implement them like that in
the final version, may require some synchronization, e.g. via file locking.
It is not impossible (I mean, it is quite unlikely, but especially with
automated CI systems not impossible *at all*) for two SSH sessions to
come in practically at once, and I have indeed seen shell startup scripts
run the same program at the same time.

It would be... interesting to have one login session write the first line,
then another session immediately write the second one, and then neither of
them will find exactly one line in the file :) And same for logout.

G'luck,
Peter

-- 
Peter Pentchev  r...@ringlet.net r...@debian.org pe...@morpheusly.com
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