WIP libstore: control parallel builds with gnu make jobserver protocol #14556
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… derivation builder
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Motivation
Another stab at the known issue involving parallel building on powerful machines with many cores.
This is a WIP draft implementation of the GNU make jobserver protocol I saw originally mentioned as a possible solution in #11143, although the load-limit setting from that pr may be a more generalized solution for this.
Another idea for this problem could involve some mechanism for resource allocation to the builder sandboxes themselves from the perspective of the system, starting minimal and ballooning resources as needed, and sleeping when they are not available. Ideally we can have some way to set a global hard cap on resource consumption.
Hacking on this at Thaigersprint/thaigersprint-2025#2
Context
Creates nix-daemon options
use-jobserverandjobserver-tokens.Places an impure FIFO populated with
jobserver-tokenstokens when the nix-daemon is started if theuse-jobserveroption is enabled. Cleans up at termination.The jobserver FIFO is added to sandbox paths for use by derivation builders with make.
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