invoking nix build from an interactive shell should inhibit sleep

[mschwaig]

Is your feature request related to a problem?

I'm running NixOS with KDE on my development machines, which by default is configured to go to to sleep after some idle time.
The problem is that invoking some long-running nix commands like nix build does not prevent the machine from going to sleep, so for longer running operations like builds and downloads, it will do part of it and then go to sleep forcing me to manually turn off the sleep on idle feature in less targeted ways.

Proposed solution

Invoking Nix to build something on an interactive terminal should invoke some API like the systemd-inhibit command, to mark the start and end of such long running applications.

Alternative solutions

I think the proposed behavior is always more desirable and should happen by default, but

• If people find some use case where this is unwanted we could make it configurable instead.
• If we do nothing users will still be able to configure the nix binary on their system to behave like this with other tools somehow - but to me that looks really tedious.

Checklist

• checked latest Nix manual (source)
• checked open feature issues and pull requests for possible duplicates

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