83 lines
2.8 KiB
Nix
83 lines
2.8 KiB
Nix
{ config, lib, ... }:
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# TODO: make a remote-build user on nixos boxes, instead of giving access to pbsds
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# TODO: https://exozy.me/quickstart
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# TODO: https://github.com/winterqt/darwin-build-box
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let
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inherit (builtins) map fromTOML readFile elem attrNames attrValues;
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inherit (lib) mkIf;
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hosts' = fromTOML (readFile ../hosts/known-hosts.toml); # TODO: eww
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hosts = lib.pipe hosts' [
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(lib.filterAttrs (name: host: name != "__default__"))
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(lib.mapAttrs (name: host:
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lib.recursiveUpdate (hosts'."__default__" or {}) host
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))
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];
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hostNames = attrNames hosts;
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thisHost = hosts.${config.networking.fqdn};
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thisHostIsBuilder = thisHost.maxJobs > 0;
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thisHostIsHopHost = builtins.elem config.networking.fqdn (lib.forEach (attrValues hosts) (host: host.ssh.proxyJump or null));
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thisHostIsConsumer = thisHost.ssh ? userPublicKey;
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mkRemoteConfig = fqdn: let
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host = hosts.${fqdn};
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jump = hosts.${host.ssh.proxyJump};
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buildMachine = (lib.filterAttrs (key: _: !elem key ["ssh"]) host) // {
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hostName = fqdn;
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sshUser = host.ssh.listenUser;
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};
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isBuilder = host.maxJobs > 0;
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isConsumer = host.ssh ? userPublicKey && thisHostIsBuilder;
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isThis = fqdn == config.networking.fqdn;
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in mkIf (!isThis) ( lib.mkMerge [
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# out
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(lib.mkIf (thisHostIsConsumer && isBuilder) {
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nix.buildMachines = [ buildMachine ];
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})
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# out or jump
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(lib.mkIf (thisHostIsConsumer && host.ssh ? listenPublicKey) {
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programs.ssh.knownHosts.${fqdn}.publicKey = host.ssh.listenPublicKey;
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# TODO: use nix.buildMachines.*.publicHostKey ?
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# timeouts are great when remote is unresponsive. nix doesn't care
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programs.ssh.extraConfig = ''
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Host ${fqdn}
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ConnectTimeout 3
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Port ${builtins.toString host.ssh.listenPort}
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${lib.optionalString (host.ssh ? proxyJump) ''
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ProxyJump ${jump.ssh.listenUser}@${host.ssh.proxyJump}:${builtins.toString jump.ssh.listenPort}
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''}
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'';
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})
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# in
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(mkIf ((thisHostIsBuilder || thisHostIsHopHost) && isConsumer) {
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users.users.${thisHost.ssh.listenUser} = {
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isSystemUser = lib.mkDefault (!config.users.users.${thisHost.ssh.listenUser}.isNormalUser);
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openssh.authorizedKeys.keys = [ host.ssh.userPublicKey ];
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group = lib.mkOptionDefault "nogroup";
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};
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})
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(mkIf (thisHostIsBuilder && isConsumer) {
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nix.settings.allowed-users = [ thisHost.ssh.listenUser ];
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nix.settings.trusted-users = [ thisHost.ssh.listenUser ];
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})
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]);
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in {
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nix.distributedBuilds = true;
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# TODO: Allow setting speedFactor for local builds, as local is currently fixed to 0
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# https://github.com/NixOS/nix/issues/2457
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# useful when the builder has a faster internet connection than i do
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nix.settings.builders-use-substitutes = true;
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imports = lib.forEach hostNames mkRemoteConfig;
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}
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