17d287afa5
Our VM builds were causing Samba to go over this limit. svn path=/nixos/trunk/; revision=16960
254 lines
8.2 KiB
Nix
254 lines
8.2 KiB
Nix
{pkgs, config, ...}:
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with pkgs.lib;
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###### interface
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let
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options = {
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environment = {
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nix = mkOption {
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default = pkgs.nixUnstable;
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example = pkgs.nixCustomFun /root/nix.tar.gz;
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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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};
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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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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 = "
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This option allows to append lines to nix.conf.
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";
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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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";
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};
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daemonNiceLevel = mkOption {
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default = 2;
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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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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.
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# !!! Fix description.
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envVars = mkOption {
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internal = true;
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default = "";
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description = "
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Define the environment variables used by nix to
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";
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merge = pkgs.lib.mergeStringOption;
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# other option should be used to define the content instead of using
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# the apply function.
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apply = conf: ''
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export NIX_CONF_DIR=/nix/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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export NIX_OTHER_STORES=/var/run/nix/remote-stores/*/nix
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'' + # */
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(if config.nix.distributedBuilds then
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''
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export NIX_BUILD_HOOK=${config.environment.nix}/libexec/nix/build-remote.pl
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export NIX_REMOTE_SYSTEMS=/etc/nix.machines
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export NIX_CURRENT_LOAD=/var/run/nix/current-load
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''
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else "")
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+
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(if config.nix.proxy != "" then
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''
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export http_proxy=${config.nix.proxy}
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export https_proxy=${config.nix.proxy}
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export ftp_proxy=${config.nix.proxy}
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''
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else "")
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+ conf;
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};
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};
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};
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in
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###### implementation
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let
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inherit (config.environment) nix;
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in
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{
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require = [
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options
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];
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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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# Likewise, if chroots are turned on, we need Nix's own
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# closure in the chroot. Otherwise nix-channel and nix-env
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# won't work because the dependencies of its builders (like
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# coreutils and Perl) aren't visible. Sigh.
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nixDeps = pkgs.writeReferencesToFile config.environment.nix;
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in
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pkgs.runCommand "nix.conf" {extraOptions = config.nix.extraOptions; } ''
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extraPaths=$(for i in $(cat ${binshDeps} ${nixDeps}); 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 (config.nix.maxJobs)}
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build-use-chroot = ${if config.nix.useChroot then "true" else "false"}
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build-chroot-dirs = /dev /dev/pts /proc /bin $(echo $extraPaths)
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$extraOptions
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END
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'';
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target = "nix.conf"; # will be symlinked from /nix/etc/nix/nix.conf in activate-configuration.sh.
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}
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]
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++ optional config.nix.distributedBuilds
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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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(pkgs.lib.concatStrings (map (machine:
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"${machine.sshUser}@${machine.hostName} ${machine.system} ${machine.sshKey} ${toString machine.maxJobs}\n"
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) config.nix.buildMachines));
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target = "nix.machines";
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};
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jobs = pkgs.lib.singleton
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{ name = "nix-daemon";
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startOn = "startup";
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script =
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''
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export PATH=${if config.nix.distributedBuilds then "${pkgs.openssh}/bin:${pkgs.gzip}/bin:" else ""}${pkgs.openssl}/bin:${nix}/bin:$PATH
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${config.nix.envVars}
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exec nice -n ${builtins.toString config.nix.daemonNiceLevel} ${nix}/bin/nix-worker --daemon > /dev/null 2>&1
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'';
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extraConfig =
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''
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limit nofile 4096 4096
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'';
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};
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environment.shellInit =
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''
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# Set up the environment variables for running Nix.
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${config.nix.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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}
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