88d7aa56e1
We do not really declare module dependencies anywhere else and it would a nousance to move any file if many other referenced it without being necessary. Also most higher level modules depend on most of the lower level ones. So removing this because it can only potentially cause weird issues.
226 lines
8.3 KiB
Nix
226 lines
8.3 KiB
Nix
/*
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Manages the remote build configuration, /etc/nix/machines
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See also
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- ./nix.nix
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- nixos/modules/services/system/nix-daemon.nix
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*/
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{ config, lib, ... }:
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let
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inherit (lib)
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any
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concatMapStrings
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concatStringsSep
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filter
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getVersion
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mkIf
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mkMerge
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mkOption
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optional
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optionalString
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types
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versionAtLeast
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;
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cfg = config.nix;
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nixPackage = cfg.package.out;
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isNixAtLeast = versionAtLeast (getVersion nixPackage);
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buildMachinesText =
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concatMapStrings
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(machine:
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(concatStringsSep " " ([
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"${optionalString (machine.protocol != null) "${machine.protocol}://"}${optionalString (machine.sshUser != null) "${machine.sshUser}@"}${machine.hostName}"
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(if machine.system != null then machine.system else if machine.systems != [ ] then concatStringsSep "," machine.systems else "-")
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(if machine.sshKey != null then machine.sshKey else "-")
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(toString machine.maxJobs)
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(toString machine.speedFactor)
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(let res = (machine.supportedFeatures ++ machine.mandatoryFeatures);
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in if (res == []) then "-" else (concatStringsSep "," res))
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(let res = machine.mandatoryFeatures;
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in if (res == []) then "-" else (concatStringsSep "," machine.mandatoryFeatures))
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]
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++ optional (isNixAtLeast "2.4pre") (if machine.publicHostKey != null then machine.publicHostKey else "-")))
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+ "\n"
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)
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cfg.buildMachines;
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in
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{
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options = {
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nix = {
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buildMachines = mkOption {
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type = types.listOf (types.submodule {
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options = {
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hostName = mkOption {
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type = types.str;
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example = "nixbuilder.example.org";
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description = lib.mdDoc ''
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The hostname of the build machine.
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'';
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};
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protocol = mkOption {
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type = types.enum [ null "ssh" "ssh-ng" ];
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default = "ssh";
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example = "ssh-ng";
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description = lib.mdDoc ''
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The protocol used for communicating with the build machine.
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Use `ssh-ng` if your remote builder and your
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local Nix version support that improved protocol.
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Use `null` when trying to change the special localhost builder
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without a protocol which is for example used by hydra.
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'';
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};
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system = mkOption {
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type = types.nullOr types.str;
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default = null;
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example = "x86_64-linux";
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description = lib.mdDoc ''
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The system type the build machine can execute derivations on.
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Either this attribute or {var}`systems` must be
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present, where {var}`system` takes precedence if
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both are set.
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'';
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};
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systems = mkOption {
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type = types.listOf types.str;
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default = [ ];
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example = [ "x86_64-linux" "aarch64-linux" ];
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description = lib.mdDoc ''
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The system types the build machine can execute derivations on.
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Either this attribute or {var}`system` must be
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present, where {var}`system` takes precedence if
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both are set.
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'';
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};
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sshUser = mkOption {
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type = types.nullOr types.str;
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default = null;
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example = "builder";
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description = lib.mdDoc ''
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The username to log in as on the remote host. This user must be
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able to log in and run nix commands non-interactively. It must
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also be privileged to build derivations, so must be included in
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{option}`nix.settings.trusted-users`.
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'';
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};
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sshKey = mkOption {
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type = types.nullOr types.str;
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default = null;
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example = "/root/.ssh/id_buildhost_builduser";
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description = lib.mdDoc ''
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The path to the SSH private key with which to authenticate on
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the build machine. The private key must not have a passphrase.
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If null, the building user (root on NixOS machines) must have an
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appropriate ssh configuration to log in non-interactively.
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Note that for security reasons, this path must point to a file
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in the local filesystem, *not* to the nix store.
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'';
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};
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maxJobs = mkOption {
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type = types.int;
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default = 1;
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description = lib.mdDoc ''
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The number of concurrent jobs the build machine supports. The
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build machine will enforce its own limits, but this allows hydra
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to schedule better since there is no work-stealing between build
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machines.
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'';
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};
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speedFactor = mkOption {
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type = types.int;
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default = 1;
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description = lib.mdDoc ''
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The relative speed of this builder. This is an arbitrary integer
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that indicates the speed of this builder, relative to other
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builders. Higher is faster.
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'';
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};
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mandatoryFeatures = mkOption {
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type = types.listOf types.str;
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default = [ ];
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example = [ "big-parallel" ];
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description = lib.mdDoc ''
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A list of features mandatory for this builder. The builder will
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be ignored for derivations that don't require all features in
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this list. All mandatory features are automatically included in
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{var}`supportedFeatures`.
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'';
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};
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supportedFeatures = mkOption {
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type = types.listOf types.str;
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default = [ ];
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example = [ "kvm" "big-parallel" ];
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description = lib.mdDoc ''
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A list of features supported by this builder. The builder will
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be ignored for derivations that require features not in this
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list.
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'';
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};
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publicHostKey = mkOption {
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type = types.nullOr types.str;
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default = null;
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description = lib.mdDoc ''
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The (base64-encoded) public host key of this builder. The field
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is calculated via {command}`base64 -w0 /etc/ssh/ssh_host_type_key.pub`.
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If null, SSH will use its regular known-hosts file when connecting.
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'';
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};
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};
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});
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default = [ ];
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description = lib.mdDoc ''
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This option lists the machines to be used if distributed builds are
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enabled (see {option}`nix.distributedBuilds`).
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Nix will perform derivations on those machines via SSH by copying the
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inputs to the Nix store on the remote machine, starting the build,
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then copying the output back to the local Nix store.
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'';
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};
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distributedBuilds = mkOption {
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type = types.bool;
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default = false;
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description = lib.mdDoc ''
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Whether to distribute builds to the machines listed in
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{option}`nix.buildMachines`.
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'';
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};
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};
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};
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# distributedBuilds does *not* inhibit /etc/machines generation; caller may
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# override that nix option.
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config = mkIf cfg.enable {
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assertions =
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let badMachine = m: m.system == null && m.systems == [ ];
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in
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[
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{
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assertion = !(any badMachine cfg.buildMachines);
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message = ''
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At least one system type (via <varname>system</varname> or
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<varname>systems</varname>) must be set for every build machine.
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Invalid machine specifications:
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'' + " " +
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(concatStringsSep "\n "
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(map (m: m.hostName)
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(filter (badMachine) cfg.buildMachines)));
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}
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];
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# List of machines for distributed Nix builds
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environment.etc."nix/machines" =
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mkIf (cfg.buildMachines != [ ]) {
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text = buildMachinesText;
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};
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# Legacy configuration conversion.
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nix.settings = mkIf (!cfg.distributedBuilds) { builders = null; };
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};
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}
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