480 lines
17 KiB
Nix
480 lines
17 KiB
Nix
{ config, lib, pkgs, ... }:
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with lib;
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let
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cfg = config.nix;
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nix = cfg.package.out;
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isNix20 = versionAtLeast (getVersion nix) "2.0pre";
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makeNixBuildUser = nr:
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{ name = "nixbld${toString nr}";
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description = "Nix build user ${toString nr}";
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/* For consistency with the setgid(2), setuid(2), and setgroups(2)
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calls in `libstore/build.cc', don't add any supplementary group
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here except "nixbld". */
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uid = builtins.add config.ids.uids.nixbld nr;
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group = "nixbld";
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extraGroups = [ "nixbld" ];
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};
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nixbldUsers = map makeNixBuildUser (range 1 cfg.nrBuildUsers);
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nixConf =
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let
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# In Nix < 2.0, If we're using sandbox for builds, then provide
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# /bin/sh in the sandbox as a bind-mount to bash. This means we
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# also need to include the entire closure of bash. Nix >= 2.0
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# provides a /bin/sh by default.
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sh = pkgs.runtimeShell;
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binshDeps = pkgs.writeReferencesToFile sh;
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in
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pkgs.runCommand "nix.conf" { extraOptions = cfg.extraOptions; } (''
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${optionalString (!isNix20) ''
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extraPaths=$(for i in $(cat ${binshDeps}); do if test -d $i; then echo $i; fi; done)
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''}
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cat > $out <<END
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# WARNING: this file is generated from the nix.* options in
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# your NixOS configuration, typically
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# /etc/nixos/configuration.nix. Do not edit it!
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build-users-group = nixbld
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${if isNix20 then "max-jobs" else "build-max-jobs"} = ${toString (cfg.maxJobs)}
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${if isNix20 then "cores" else "build-cores"} = ${toString (cfg.buildCores)}
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${if isNix20 then "sandbox" else "build-use-sandbox"} = ${if (builtins.isBool cfg.useSandbox) then boolToString cfg.useSandbox else cfg.useSandbox}
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${if isNix20 then "extra-sandbox-paths" else "build-sandbox-paths"} = ${toString cfg.sandboxPaths} ${optionalString (!isNix20) "/bin/sh=${sh} $(echo $extraPaths)"}
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${if isNix20 then "substituters" else "binary-caches"} = ${toString cfg.binaryCaches}
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${if isNix20 then "trusted-substituters" else "trusted-binary-caches"} = ${toString cfg.trustedBinaryCaches}
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${if isNix20 then "trusted-public-keys" else "binary-cache-public-keys"} = ${toString cfg.binaryCachePublicKeys}
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auto-optimise-store = ${boolToString cfg.autoOptimiseStore}
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${if isNix20 then ''
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require-sigs = ${if cfg.requireSignedBinaryCaches then "true" else "false"}
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'' else ''
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signed-binary-caches = ${if cfg.requireSignedBinaryCaches then "*" else ""}
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''}
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trusted-users = ${toString cfg.trustedUsers}
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allowed-users = ${toString cfg.allowedUsers}
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${optionalString (isNix20 && !cfg.distributedBuilds) ''
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builders =
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''}
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$extraOptions
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END
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'' + optionalString cfg.checkConfig ''
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echo "Checking that Nix can read nix.conf..."
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ln -s $out ./nix.conf
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NIX_CONF_DIR=$PWD ${cfg.package}/bin/nix show-config >/dev/null
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'');
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in
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{
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###### interface
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options = {
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nix = {
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package = mkOption {
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type = types.package;
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default = pkgs.nix;
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defaultText = "pkgs.nix";
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description = ''
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This option specifies the Nix package instance to use throughout the system.
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'';
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};
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maxJobs = mkOption {
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type = types.either types.int (types.enum ["auto"]);
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default = 1;
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example = 64;
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description = ''
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This option defines the maximum number of jobs that Nix will try
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to build in parallel. The default is 1. You should generally
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set it to the total number of logical cores in your system (e.g., 16
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for two CPUs with 4 cores each and hyper-threading).
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'';
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};
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autoOptimiseStore = mkOption {
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type = types.bool;
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default = false;
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example = true;
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description = ''
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If set to true, Nix automatically detects files in the store that have
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identical contents, and replaces them with hard links to a single copy.
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This saves disk space. If set to false (the default), you can still run
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nix-store --optimise to get rid of duplicate files.
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'';
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};
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buildCores = mkOption {
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type = types.int;
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default = 1;
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example = 64;
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description = ''
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This option defines the maximum number of concurrent tasks during
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one build. It affects, e.g., -j option for make. The default is 1.
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The special value 0 means that the builder should use all
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available CPU cores in the system. Some builds may become
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non-deterministic with this option; use with care! Packages will
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only be affected if enableParallelBuilding is set for them.
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'';
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};
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useSandbox = mkOption {
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type = types.either types.bool (types.enum ["relaxed"]);
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default = true;
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description = "
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If set, Nix will perform builds in a sandboxed environment that it
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will set up automatically for each build. This prevents impurities
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in builds by disallowing access to dependencies outside of the Nix
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store by using network and mount namespaces in a chroot environment.
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This is enabled by default even though it has a possible performance
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impact due to the initial setup time of a sandbox for each build. It
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doesn't affect derivation hashes, so changing this option will not
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trigger a rebuild of packages.
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";
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};
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sandboxPaths = mkOption {
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type = types.listOf types.str;
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default = [];
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example = [ "/dev" "/proc" ];
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description =
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''
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Directories from the host filesystem to be included
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in the sandbox.
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'';
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};
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extraOptions = mkOption {
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type = types.lines;
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default = "";
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example = ''
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gc-keep-outputs = true
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gc-keep-derivations = true
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'';
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description = "Additional text appended to <filename>nix.conf</filename>.";
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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 = ''
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Whether to distribute builds to the machines listed in
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<option>nix.buildMachines</option>.
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'';
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};
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daemonNiceLevel = mkOption {
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type = types.int;
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default = 0;
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description = ''
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Nix daemon process priority. This priority propagates to build processes.
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0 is the default Unix process priority, 19 is the lowest.
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'';
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};
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daemonIONiceLevel = mkOption {
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type = types.int;
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default = 0;
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description = ''
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Nix daemon process I/O priority. This priority propagates to build processes.
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0 is the default Unix process I/O priority, 7 is the lowest.
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'';
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};
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buildMachines = mkOption {
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type = types.listOf types.attrs;
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default = [];
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example = literalExample ''
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[ { hostName = "voila.labs.cs.uu.nl";
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sshUser = "nix";
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sshKey = "/root/.ssh/id_buildfarm";
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system = "powerpc-darwin";
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maxJobs = 1;
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}
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{ hostName = "linux64.example.org";
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sshUser = "buildfarm";
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sshKey = "/root/.ssh/id_buildfarm";
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system = "x86_64-linux";
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maxJobs = 2;
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speedFactor = 2;
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supportedFeatures = [ "kvm" ];
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mandatoryFeatures = [ "perf" ];
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}
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]
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'';
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description = ''
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This option lists the machines to be used if distributed
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builds are enabled (see
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<option>nix.distributedBuilds</option>). Nix will perform
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derivations on those machines via SSH by copying the inputs
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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. Each
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element of the list should be an attribute set containing
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the machine's host name (<varname>hostname</varname>), the
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user name to be used for the SSH connection
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(<varname>sshUser</varname>), the Nix system type
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(<varname>system</varname>, e.g.,
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<literal>"i686-linux"</literal>), the maximum number of
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jobs to be run in parallel on that machine
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(<varname>maxJobs</varname>), the path to the SSH private
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key to be used to connect (<varname>sshKey</varname>), a
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list of supported features of the machine
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(<varname>supportedFeatures</varname>) and a list of
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mandatory features of the machine
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(<varname>mandatoryFeatures</varname>). The SSH private key
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should not have a passphrase, and the corresponding public
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key should be added to
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<filename>~<replaceable>sshUser</replaceable>/authorized_keys</filename>
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on the remote machine.
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'';
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};
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# Environment variables for running Nix.
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envVars = mkOption {
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type = types.attrs;
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internal = true;
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default = {};
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description = "Environment variables used by Nix.";
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};
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nrBuildUsers = mkOption {
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type = types.int;
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description = ''
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Number of <literal>nixbld</literal> user accounts created to
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perform secure concurrent builds. If you receive an error
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message saying that “all build users are currently in use”,
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you should increase this value.
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'';
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};
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readOnlyStore = mkOption {
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type = types.bool;
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default = true;
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description = ''
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If set, NixOS will enforce the immutability of the Nix store
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by making <filename>/nix/store</filename> a read-only bind
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mount. Nix will automatically make the store writable when
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needed.
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'';
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};
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binaryCaches = mkOption {
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type = types.listOf types.str;
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default = [ https://cache.nixos.org/ ];
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description = ''
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List of binary cache URLs used to obtain pre-built binaries
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of Nix packages.
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'';
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};
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trustedBinaryCaches = mkOption {
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type = types.listOf types.str;
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default = [ ];
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example = [ http://hydra.nixos.org/ ];
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description = ''
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List of binary cache URLs that non-root users can use (in
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addition to those specified using
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<option>nix.binaryCaches</option>) by passing
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<literal>--option binary-caches</literal> to Nix commands.
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'';
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};
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requireSignedBinaryCaches = mkOption {
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type = types.bool;
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default = true;
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description = ''
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If enabled (the default), Nix will only download binaries from binary caches if
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they are cryptographically signed with any of the keys listed in
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<option>nix.binaryCachePublicKeys</option>. If disabled, signatures are neither
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required nor checked, so it's strongly recommended that you use only
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trustworthy caches and https to prevent man-in-the-middle attacks.
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'';
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};
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binaryCachePublicKeys = mkOption {
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type = types.listOf types.str;
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example = [ "hydra.nixos.org-1:CNHJZBh9K4tP3EKF6FkkgeVYsS3ohTl+oS0Qa8bezVs=" ];
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description = ''
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List of public keys used to sign binary caches. If
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<option>nix.requireSignedBinaryCaches</option> is enabled,
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then Nix will use a binary from a binary cache if and only
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if it is signed by <emphasis>any</emphasis> of the keys
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listed here. By default, only the key for
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<uri>cache.nixos.org</uri> is included.
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'';
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};
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trustedUsers = mkOption {
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type = types.listOf types.str;
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default = [ "root" ];
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example = [ "root" "alice" "@wheel" ];
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description = ''
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A list of names of users that have additional rights when
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connecting to the Nix daemon, such as the ability to specify
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additional binary caches, or to import unsigned NARs. You
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can also specify groups by prefixing them with
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<literal>@</literal>; for instance,
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<literal>@wheel</literal> means all users in the wheel
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group.
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'';
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};
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allowedUsers = mkOption {
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type = types.listOf types.str;
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default = [ "*" ];
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example = [ "@wheel" "@builders" "alice" "bob" ];
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description = ''
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A list of names of users (separated by whitespace) that are
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allowed to connect to the Nix daemon. As with
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<option>nix.trustedUsers</option>, you can specify groups by
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prefixing them with <literal>@</literal>. Also, you can
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allow all users by specifying <literal>*</literal>. The
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default is <literal>*</literal>. Note that trusted users are
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always allowed to connect.
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'';
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};
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nixPath = mkOption {
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type = types.listOf types.str;
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default =
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[
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"nixpkgs=/nix/var/nix/profiles/per-user/root/channels/nixos"
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"nixos-config=/etc/nixos/configuration.nix"
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"/nix/var/nix/profiles/per-user/root/channels"
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];
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description = ''
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The default Nix expression search path, used by the Nix
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evaluator to look up paths enclosed in angle brackets
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(e.g. <literal><nixpkgs></literal>).
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'';
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};
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checkConfig = mkOption {
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type = types.bool;
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default = true;
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description = ''
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If enabled (the default), checks that Nix can parse the generated nix.conf.
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'';
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};
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};
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};
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###### implementation
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config = {
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nix.binaryCachePublicKeys = [ "cache.nixos.org-1:6NCHdD59X431o0gWypbMrAURkbJ16ZPMQFGspcDShjY=" ];
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environment.etc."nix/nix.conf".source = nixConf;
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# List of machines for distributed Nix builds in the format
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# expected by build-remote.pl.
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environment.etc."nix/machines" =
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{ enable = cfg.buildMachines != [];
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text =
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concatMapStrings (machine:
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"${if machine ? sshUser then "${machine.sshUser}@" else ""}${machine.hostName} "
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+ machine.system or (concatStringsSep "," machine.systems)
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+ " ${machine.sshKey or "-"} ${toString machine.maxJobs or 1} "
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+ toString (machine.speedFactor or 1)
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+ " "
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+ concatStringsSep "," (machine.mandatoryFeatures or [] ++ machine.supportedFeatures or [])
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+ " "
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+ concatStringsSep "," machine.mandatoryFeatures or []
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+ "\n"
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) cfg.buildMachines;
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};
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systemd.packages = [ nix ];
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systemd.sockets.nix-daemon.wantedBy = [ "sockets.target" ];
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systemd.services.nix-daemon =
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{ path = [ nix pkgs.utillinux config.programs.ssh.package ]
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++ optionals cfg.distributedBuilds [ pkgs.gzip ]
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++ optionals (!isNix20) [ pkgs.openssl.bin ];
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environment = cfg.envVars
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// { CURL_CA_BUNDLE = "/etc/ssl/certs/ca-certificates.crt"; }
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// config.networking.proxy.envVars;
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unitConfig.RequiresMountsFor = "/nix/store";
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serviceConfig =
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{ Nice = cfg.daemonNiceLevel;
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IOSchedulingPriority = cfg.daemonIONiceLevel;
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LimitNOFILE = 4096;
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};
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restartTriggers = [ nixConf ];
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};
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nix.envVars =
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optionalAttrs (!isNix20) {
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NIX_CONF_DIR = "/etc/nix";
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# Enable the copy-from-other-stores substituter, which allows
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# builds to be sped up by copying build results from remote
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# Nix stores. To do this, mount the remote file system on a
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# subdirectory of /run/nix/remote-stores.
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NIX_OTHER_STORES = "/run/nix/remote-stores/*/nix";
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}
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// optionalAttrs (cfg.distributedBuilds && !isNix20) {
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NIX_BUILD_HOOK = "${nix}/libexec/nix/build-remote.pl";
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};
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# Set up the environment variables for running Nix.
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environment.sessionVariables = cfg.envVars //
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{ NIX_PATH = cfg.nixPath;
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};
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environment.extraInit = optionalString (!isNix20)
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''
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# Set up secure multi-user builds: non-root users build through the
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# Nix daemon.
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if [ "$USER" != root -o ! -w /nix/var/nix/db ]; then
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export NIX_REMOTE=daemon
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fi
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'' + ''
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if [ -e "$HOME/.nix-defexpr/channels" ]; then
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export NIX_PATH="$HOME/.nix-defexpr/channels''${NIX_PATH:+:$NIX_PATH}"
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fi
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'';
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nix.nrBuildUsers = mkDefault (lib.max 32 cfg.maxJobs);
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users.users = nixbldUsers;
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services.xserver.displayManager.hiddenUsers = map ({ name, ... }: name) nixbldUsers;
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# FIXME: use systemd-tmpfiles to create Nix directories.
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system.activationScripts.nix = stringAfter [ "etc" "users" ]
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''
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# Nix initialisation.
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install -m 0755 -d \
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/nix/var/nix/gcroots \
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/nix/var/nix/temproots \
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/nix/var/nix/userpool \
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/nix/var/nix/profiles \
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/nix/var/nix/db \
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/nix/var/log/nix/drvs
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install -m 1777 -d \
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/nix/var/nix/gcroots/per-user \
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/nix/var/nix/profiles/per-user \
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/nix/var/nix/gcroots/tmp
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'';
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};
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}
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