# Test Nix's remote build feature. { system, nix }: with import <nixpkgs/nixos/lib/testing.nix> { inherit system; }; makeTest ({ pkgs, ... }: let # The configuration of the build slaves. slave = { config, pkgs, ... }: { services.openssh.enable = true; virtualisation.writableStore = true; environment.nix = nix; }; # Trivial Nix expression to build remotely. expr = config: nr: pkgs.writeText "expr.nix" '' let utils = builtins.storePath ${config.system.build.extraUtils}; in derivation { name = "hello-${toString nr}"; system = "i686-linux"; PATH = "''${utils}/bin"; builder = "''${utils}/bin/sh"; args = [ "-c" "echo Hello; mkdir $out; cat /proc/sys/kernel/hostname > $out/host; sleep 3" ]; } ''; in { nodes = { slave1 = slave; slave2 = slave; client = { config, pkgs, ... }: { nix.maxJobs = 0; # force remote building nix.distributedBuilds = true; nix.buildMachines = [ { hostName = "slave1"; sshUser = "root"; sshKey = "/root/.ssh/id_dsa"; system = "i686-linux"; maxJobs = 1; } { hostName = "slave2"; sshUser = "root"; sshKey = "/root/.ssh/id_dsa"; system = "i686-linux"; maxJobs = 1; } ]; virtualisation.writableStore = true; virtualisation.pathsInNixDB = [ config.system.build.extraUtils ]; environment.nix = nix; }; }; testScript = { nodes }: '' startAll; # Create an SSH key on the client. my $key = `${pkgs.openssh}/bin/ssh-keygen -t dsa -f key -N ""`; $client->succeed("mkdir -m 700 /root/.ssh"); $client->copyFileFromHost("key", "/root/.ssh/id_dsa"); $client->succeed("chmod 600 /root/.ssh/id_dsa"); # Install the SSH key on the slaves. $client->waitForUnit("network.target"); foreach my $slave ($slave1, $slave2) { $slave->succeed("mkdir -m 700 /root/.ssh"); $slave->copyFileFromHost("key.pub", "/root/.ssh/authorized_keys"); $slave->waitForUnit("sshd"); $client->succeed("ssh -o StrictHostKeyChecking=no " . $slave->name() . " 'echo hello world'"); } # Perform a build and check that it was performed on the slave. my $out = $client->succeed("nix-build ${expr nodes.client.config 1}"); $slave1->succeed("test -e $out"); # And a parallel build. my ($out1, $out2) = split /\s/, $client->succeed("nix-store -r \$(nix-instantiate ${expr nodes.client.config 2} ${expr nodes.client.config 3})"); $slave1->succeed("test -e $out1 -o -e $out2"); $slave2->succeed("test -e $out1 -o -e $out2"); # Test whether the build hook automatically skips unavailable slaves. $slave1->block; $client->succeed("nix-build ${expr nodes.client.config 4}"); ''; })