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|
{ flake, config, lib, hostName, ... }:
with lib;
let
cfg = config.nix.buildServers;
secretName = name: "nix-ssh-builder-${name}-private";
buildHostName = host: "nix-ssh-builder-${host}";
in {
options = {
nix = {
buildServers = mkOption {
type = types.attrsOf (types.submodule {
options = {
address = mkOption {
type = types.str;
};
system = mkOption {
type = types.nullOr types.str;
default = null;
example = "x86_64-linux";
description = ''
The system type the build machine can execute derivations on.
Either this attribute or <varname>systems</varname> must be
present, where <varname>system</varname> takes precedence if
both are set.
'';
};
systems = mkOption {
type = types.listOf types.str;
default = [];
example = [ "x86_64-linux" "aarch64-linux" ];
description = ''
The system types the build machine can execute derivations on.
Either this attribute or <varname>system</varname> must be
present, where <varname>system</varname> takes precedence if
both are set.
'';
};
maxJobs = mkOption {
type = types.int;
default = 1;
description = ''
The number of concurrent jobs the build machine supports. The
build machine will enforce its own limits, but this allows hydra
to schedule better since there is no work-stealing between build
machines.
'';
};
speedFactor = mkOption {
type = types.int;
default = 1;
description = ''
The relative speed of this builder. This is an arbitrary integer
that indicates the speed of this builder, relative to other
builders. Higher is faster.
'';
};
mandatoryFeatures = mkOption {
type = types.listOf types.str;
default = [];
example = [ "big-parallel" ];
description = ''
A list of features mandatory for this builder. The builder will
be ignored for derivations that don't require all features in
this list. All mandatory features are automatically included in
<varname>supportedFeatures</varname>.
'';
};
supportedFeatures = mkOption {
type = types.listOf types.str;
default = [];
example = [ "kvm" "big-parallel" ];
description = ''
A list of features supported by this builder. The builder will
be ignored for derivations that require features not in this
list.
'';
};
};
});
default = {};
};
};
};
config = mkIf (cfg != {}) {
programs.ssh.extraConfig = concatMapStringsSep "\n" ({ name, value }: ''
Host ${buildHostName name}
User nix-ssh-builder
HostName ${value.address}
IdentitiesOnly yes
IdentityFile ${config.sops.secrets.${secretName name}.path}
ControlMaster auto
ControlPath /run/nix-ssh-builder-master-%r@%n:%p
ControlPersist 30m
Compression yes
ForwardAgent no
ServerAliveInterval 6
ServerAliveCountMax 10
'') (mapAttrsToList nameValuePair cfg);
sops.secrets = mapAttrs' (name: hCfg: nameValuePair (secretName name) { sopsFile = ../system-profiles/build-server/clients + "/${hostName}/private"; format = "binary"; }) cfg;
nix = {
distributedBuilds = true;
buildMachines = mapAttrsToList (name: hCfg: { hostName = buildHostName name; inherit (hCfg) system systems maxJobs speedFactor mandatoryFeatures supportedFeatures; }) cfg;
};
};
}
|
