forked from mirrors/nixpkgs
179acfb664
If you define a unit, and either systemd or a package in systemd.packages already provides that unit, then we now generate a file /etc/systemd/system/<unit>.d/overrides.conf. This makes it possible to use upstream units, while allowing them to be customised from the NixOS configuration. For instance, the module nix-daemon.nix now uses the units provided by the Nix package. And all unit definitions that duplicated upstream systemd units are finally gone. This makes the baseUnit option unnecessary, so I've removed it.
357 lines
11 KiB
Nix
357 lines
11 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;
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makeNixBuildUser = nr:
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{ name = "nixbld${toString nr}";
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description = "Nix build user ${toString nr}";
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/* For consistency with the setgid(2), setuid(2), and setgroups(2)
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calls in `libstore/build.cc', don't add any supplementary group
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here except "nixbld". */
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uid = builtins.add config.ids.uids.nixbld nr;
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group = "nixbld";
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extraGroups = [ "nixbld" ];
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};
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nixConf =
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let
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# Tricky: if we're using a chroot for builds, then we need
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# /bin/sh in the chroot (our own compromise to purity).
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# However, since /bin/sh is a symlink to some path in the
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# Nix store, which furthermore has runtime dependencies on
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# other paths in the store, we need the closure of /bin/sh
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# in `build-chroot-dirs' - otherwise any builder that uses
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# /bin/sh won't work.
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binshDeps = pkgs.writeReferencesToFile config.system.build.binsh;
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in
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pkgs.runCommand "nix.conf" {extraOptions = cfg.extraOptions; } ''
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extraPaths=$(for i in $(cat ${binshDeps}); do if test -d $i; then echo $i; fi; done)
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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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build-max-jobs = ${toString (cfg.maxJobs)}
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build-use-chroot = ${if cfg.useChroot then "true" else "false"}
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build-chroot-dirs = ${toString cfg.chrootDirs} $(echo $extraPaths)
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binary-caches = ${toString cfg.binaryCaches}
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trusted-binary-caches = ${toString cfg.trustedBinaryCaches}
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$extraOptions
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END
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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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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.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 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 number of CPUs in your system (e.g., 2 on an Athlon
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64 X2).
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";
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};
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useChroot = mkOption {
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type = types.bool;
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default = false;
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description = "
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If set, Nix will perform builds in a chroot-environment that it
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will set up automatically for each build. This prevents
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impurities in builds by disallowing access to dependencies
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outside of the Nix store.
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";
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};
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chrootDirs = 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 chroot.
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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, 20 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 = [
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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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supportedFeatures = "kvm";
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mandatoryFeatures = "perf";
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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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proxy = mkOption {
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type = types.str;
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default = "";
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description = ''
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This option specifies the proxy to use for fetchurl. The real effect
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is just exporting http_proxy, https_proxy and ftp_proxy with that
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value.
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'';
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example = "http://127.0.0.1:3128";
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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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default = 10;
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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 = [ http://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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};
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};
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###### implementation
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config = {
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nix.chrootDirs = [ "/bin" ];
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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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"${machine.sshUser}@${machine.hostName} "
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+ (if machine ? system then machine.system else concatStringsSep "," machine.systems)
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+ " ${machine.sshKey} ${toString machine.maxJobs} "
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+ (if machine ? speedFactor then toString machine.speedFactor else "1" )
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+ " "
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+ (if machine ? supportedFeatures then concatStringsSep "," machine.supportedFeatures else "" )
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+ " "
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+ (if machine ? mandatoryFeatures then concatStringsSep "," machine.mandatoryFeatures else "" )
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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.services.nix-daemon =
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{ path = [ nix pkgs.openssl pkgs.utillinux pkgs.openssh ]
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++ optionals cfg.distributedBuilds [ pkgs.gzip ];
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environment = cfg.envVars // { CURL_CA_BUNDLE = "/etc/ssl/certs/ca-bundle.crt"; };
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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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{ 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 {
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NIX_BUILD_HOOK = "${nix}/libexec/nix/build-remote.pl";
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NIX_REMOTE_SYSTEMS = "/etc/nix/machines";
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NIX_CURRENT_LOAD = "/run/nix/current-load";
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}
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# !!! These should not be defined here, but in some general proxy configuration module!
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// optionalAttrs (cfg.proxy != "") {
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http_proxy = cfg.proxy;
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https_proxy = cfg.proxy;
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ftp_proxy = cfg.proxy;
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};
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# Set up the environment variables for running Nix.
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environment.variables = cfg.envVars;
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environment.extraInit =
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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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users.extraUsers = map makeNixBuildUser (range 1 cfg.nrBuildUsers);
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system.activationScripts.nix = stringAfter [ "etc" "users" ]
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''
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# Nix initialisation.
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mkdir -m 0755 -p \
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/nix/var/nix/gcroots \
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/nix/var/nix/temproots \
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/nix/var/nix/manifests \
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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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/nix/var/nix/channel-cache \
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/nix/var/nix/chroots
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mkdir -m 1777 -p \
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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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ln -sf /nix/var/nix/profiles /nix/var/nix/gcroots/
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ln -sf /nix/var/nix/manifests /nix/var/nix/gcroots/
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'';
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};
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}
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