Re: RFC: subcommand to pause/resume builds

[Tobias Geerinckx-Rice <me@tobias.gr>]

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Ludo',

Ludovic Courtès 写道：
> First, note that the daemon is unaware of “packages”, it only 
> knows
> about “derivations”.

Derivations have a (file) name, which can be matched with a regex 
allowing one to, say, ‘pause libreoffice’.  It works in practice. 
I do this often & it's *extremely* convenient.

Sometimes even necessary, because I have a habit of starting too 
many builds ;-)  It's nice not to lose 6h of work.

Not every handy hack needs to be upstreamed though.  ‘It's fugly’ 
is a strong argument in Guixland, and I like that.

However, this is FUD:

> 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.

Kind regards,

T G-R, now thinking about acronyms like ‘CRIU’ and what a 
next-level hack would look like...

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