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prebuild: add gaming closure, stagger timers

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rope 2026-08-09 11:28:39 +01:00
parent b55d6de636
commit 55dc95dd2b
1 changed files with 48 additions and 28 deletions
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52
services/prebuild.nix
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@ -1,18 +1,18 @@
# services/prebuild.nix — nightly pre-build of the Macbook's system closure. # services/prebuild.nix — nightly pre-build of the other hosts' system closures.
# #
# The Macbook runs with max-jobs = 0 and offloads every build to this host # Both laptops/desktops offload builds to this host (nix.buildMachines in
# (nix.buildMachines in common.nix). Realising its toplevel here ahead of time # common.nix), and the Macbook can't build at all (max-jobs = 0). Realising
# turns `update` on the laptop into a pure copy: the offloaded build finds the # their toplevels here ahead of time turns `update` on those machines into a
# path already in this store and just ships it back over SSH. # pure copy: the offloaded build finds the path already in this store and just
# ships it back over SSH.
# #
# --out-link doubles as the gc root, so `clean` doesn't reap the closure # --out-link doubles as the gc root, so `clean` doesn't reap the closures
# before the laptop ever asks for it. # before the other machines ever ask for them.
{ config, lib, pkgs, ... }: { config, lib, pkgs, ... }:
{ let
config = lib.mkIf (config.networking.hostName == "FredOS-Mediaserver") { mkService = host: {
systemd.services.prebuild-macbook = { description = "Pre-build the ${host} system closure";
description = "Pre-build the FredOS-Macbook system closure";
after = [ "network-online.target" ]; after = [ "network-online.target" ];
wants = [ "network-online.target" ]; wants = [ "network-online.target" ];
path = [ pkgs.git ]; path = [ pkgs.git ];
@ -21,19 +21,39 @@
Type = "oneshot"; Type = "oneshot";
StateDirectory = "prebuild"; StateDirectory = "prebuild";
}; };
# Gaming's kernel comes from lantian's attic (see hosts/hardware/
# FredOS-Gaming.nix). That substituter isn't configured on this host, so
# without it the cachyos kernel gets built from source here instead of
# fetched — hours, not minutes. Harmless for the Macbook.
script = '' script = ''
${config.nix.package}/bin/nix build --refresh --out-link /var/lib/prebuild/FredOS-Macbook \ ${config.nix.package}/bin/nix build --refresh \
'git+https://forg.gregersen.it/rope/nixos#nixosConfigurations.FredOS-Macbook.config.system.build.toplevel' --option extra-substituters https://attic.xuyh0120.win/lantian \
--option extra-trusted-public-keys lantian:EeAUQ+W+6r7EtwnmYjeVwx5kOGEBpjlBfPlzGlTNvHc= \
--out-link /var/lib/prebuild/${host} \
'git+https://forg.gregersen.it/rope/nixos#nixosConfigurations.${host}.config.system.build.toplevel'
''; '';
}; };
systemd.timers.prebuild-macbook = { # Staggered so the two builds don't fight over cores and bandwidth.
mkTimer = startAt: {
wantedBy = [ "timers.target" ]; wantedBy = [ "timers.target" ];
timerConfig = { timerConfig = {
OnCalendar = "04:00"; OnCalendar = startAt;
Persistent = true; Persistent = true;
RandomizedDelaySec = "30m"; RandomizedDelaySec = "20m";
}; };
}; };
in
{
config = lib.mkIf (config.networking.hostName == "FredOS-Mediaserver") {
systemd.services = {
prebuild-macbook = mkService "FredOS-Macbook";
prebuild-gaming = mkService "FredOS-Gaming";
};
systemd.timers = {
prebuild-macbook = mkTimer "04:00";
prebuild-gaming = mkTimer "05:00";
};
}; };
} }