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Re: RFC: subcommand to pause/resume builds
From: |
John Soo |
Subject: |
Re: RFC: subcommand to pause/resume builds |
Date: |
Tue, 03 Nov 2020 06:41:02 -0800 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/27.1 (gnu/linux) |
Hello!
I want to preface all this by saying this is not a huge priority to me.
pause/resume would just be a nice quality of life improvement.
Ludovic Courtès <ludo@gnu.org> writes:
> First, note that the daemon is unaware of “packages”, it only knows
> about “derivations”.
Agreed. I was thinking mostly about the best interface for a user. But
if derivations are too low-level I can see not being able to use the
package name.
> Second, ‘guix processes’ is nice but it uses low-level heuristics to
> determine what daemon sessions are open, what their clients are, and
> what they’re building; it resorts to heuristics because the daemon as it
> stands doesn’t have a way to communicate its current state. It works
> well in practice, but still I wouldn’t go too far building around it.
>
> Last, you’d need to send SIGTSTP to the whole process group of the
> build, like so (I think, haven’t tried):
>
> sudo kill -TSTP -123
Ah right, I got that advice on IRC also but I don't actually know how to
do it. Thanks!
> where 123 is the “SessionPID” shown by ‘guix processes’. However, doing
> so may affect build results: processes in the build environment might
> handle SIGTSTP specially, which can have side effects. It’s an
> observable action.
I thought of the side effects after sending the email. Makes sense to
me. Does that mean it is not worth including? Given that the source and
state of a build do not change while paused, if a build tool changes its
outputs after paused/resumed is it still reproducible?
The other part that would make it difficult is that maybe different
build-systems respond differently to different signals. A simpler to
implement alternative might just be to provide a way to send an
arbitrary signal to the process tree. Given some builds might respond
un-reproducibly to it, a warning could be provided.
In any case, such a subcommand not a high priority to me as a user,
though sometimes I long to pause guix build ungoogled-chromium.
Thanks again,
John
- RFC: subcommand to pause/resume builds, John Soo, 2020/11/02
- Re: RFC: subcommand to pause/resume builds, Ludovic Courtès, 2020/11/03
- Re: RFC: subcommand to pause/resume builds,
John Soo <=
- Re: RFC: subcommand to pause/resume builds, Tobias Geerinckx-Rice, 2020/11/03
- Re: RFC: subcommand to pause/resume builds, Tobias Geerinckx-Rice, 2020/11/03
- Re: RFC: subcommand to pause/resume builds, John Soo, 2020/11/03
- Re: RFC: subcommand to pause/resume builds, John Soo, 2020/11/03
- Re: RFC: subcommand to pause/resume builds, Ludovic Courtès, 2020/11/06
- Re: RFC: subcommand to pause/resume builds, John Soo, 2020/11/06
Re: RFC: subcommand to pause/resume builds, Bengt Richter, 2020/11/04
Re: RFC: subcommand to pause/resume builds, Mark H Weaver, 2020/11/06