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Re: RFC: subcommand to pause/resume builds

From: Ludovic Courtès
Subject: Re: RFC: subcommand to pause/resume builds
Date: Tue, 03 Nov 2020 14:53:07 +0100
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/27.1 (gnu/linux)


John Soo <> skribis:

> I was looking to pause a long build today and asked on IRC how to
> accomplish pause/resume.  It seems this is possible already with the
> following:
> kill --signal SIGSTOP|SIGCONT {pids-of-build-process-tree}
> There is already a command to list the processes associated to guix
> commands: guix processes.  Perhaps pause/resume can be a subcommand or
> set of flags to guix processes. The following is the first thing that
> comes to mind:
> guix processes --pause package-name ... --resume package-name ...
> What do you think?

First, note that the daemon is unaware of “packages”, it only knows
about “derivations”.

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

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.

Conclusion: I don’t think we can implement this reliably.



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