0930befd58
That flag doesn't do anything, except that it allows setting the client PID in the process title of the children.
361 lines
12 KiB
Nix
361 lines
12 KiB
Nix
{ config, pkgs, ... }:
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with pkgs.lib;
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let
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cfg = config.nix;
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inherit (config.environment) nix;
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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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in
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{
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###### interface
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options = {
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environment.nix = mkOption {
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default = pkgs.nix;
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merge = mergeOneOption;
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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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nix = {
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maxJobs = mkOption {
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default = 1;
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example = 2;
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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 a 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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default = false;
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example = true;
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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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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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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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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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If you know that the <option>buildMachines</option> are not
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always available either use nixos
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<command>nixos-rebuild --no-build-hook</command>
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or consider managing <filename>/etc/nix.machines</filename> manually
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by setting <option>manualNixMachines</option>. Then you can comment
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unavailable buildmachines.
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";
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};
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manualNixMachines = mkOption {
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default = false;
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description = "
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Whether to manually manage the list of buildmachines used in distributed
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builds in /etc/nix.machines.
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";
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};
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daemonNiceLevel = mkOption {
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default = 10;
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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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default = 7;
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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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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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}
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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 to
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the Nix store on the remote machine, starting the build, then
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copying the output back to the local Nix store. Each element
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of the list should be an attribute set containing the
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machine's host name (<varname>hostname</varname>), the user
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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 jobs
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to be run in parallel on that machine
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(<varname>maxJobs</varname>), and the path to the SSH private
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key to be used to connect (<varname>sshKey</varname>). The
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SSH private key should not have a passphrase, and the
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corresponding public 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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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. !!! Misnomer - it's
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# actually a shell script.
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envVars = mkOption {
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internal = true;
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default = {};
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type = types.attrs;
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description = "Environment variables used by Nix.";
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};
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nrBuildUsers = mkOption {
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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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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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default = [ http://nixos.org/binary-cache ];
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type = types.list types.string;
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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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default = [ ];
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example = [ http://hydra.nixos.org/ ];
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type = types.list types.string;
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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 = [ "/dev" "/dev/pts" "/proc" "/bin" ];
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environment.etc =
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[ { # Nix configuration.
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source =
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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.
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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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target = "nix/nix.conf";
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}
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]
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++ optional (cfg.distributedBuilds && !cfg.manualNixMachines)
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{ # List of machines for distributed Nix builds in the format expected
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# by build-remote.pl.
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source = pkgs.writeText "nix.machines"
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(concatStrings (map (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} ${toString machine.maxJobs} "
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+ (if machine ? speedFactor then toString machine.speedFactor else "1" )
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+ "\n"
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) cfg.buildMachines));
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target = "nix.machines";
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};
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systemd.sockets."nix-daemon" =
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{ description = "Nix Daemon Socket";
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wantedBy = [ "sockets.target" ];
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before = [ "multi-user.target" ];
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socketConfig.ListenStream = "/nix/var/nix/daemon-socket/socket";
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};
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systemd.services."nix-daemon" =
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{ description = "Nix Daemon";
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path = [ nix pkgs.openssl pkgs.utillinux ]
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++ optionals cfg.distributedBuilds [ pkgs.openssh pkgs.gzip ];
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environment = cfg.envVars;
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serviceConfig =
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{ ExecStart = "@${nix}/bin/nix-daemon nix-daemon --daemon";
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KillMode = "process";
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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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};
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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 builds
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# to be sped up by copying build results from remote Nix stores. To
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# do this, mount the remote file system on a subdirectory of
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# /var/run/nix/remote-stores.
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NIX_OTHER_STORES = "/var/run/nix/remote-stores/*/nix";
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}
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// optionalAttrs cfg.distributedBuilds {
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NIX_BUILD_HOOK = "${config.environment.nix}/libexec/nix/build-remote.pl";
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NIX_REMOTE_SYSTEMS = "/etc/nix.machines";
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NIX_CURRENT_LOAD = "/var/run/nix/current-load";
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}
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# !!! These should not be defined here, but in some general proxy configuration module!
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// optionalAttrs (cfg.proxy != "") {
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http_proxy = cfg.proxy;
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https_proxy = cfg.proxy;
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ftp_proxy = cfg.proxy;
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};
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environment.shellInit =
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''
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# Set up the environment variables for running Nix.
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${concatMapStrings (n: "export ${n}=\"${getAttr n cfg.envVars}\"\n") (attrNames cfg.envVars)}
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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 test "$USER" != root; then
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export NIX_REMOTE=daemon
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else
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export NIX_REMOTE=
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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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