* Move the remote building test from the NixOS tree to the Nix tree.

release.nix

@@ -1,5 +1,5 @@
-{ nixpkgs ? ../nixpkgs
-, nix ? { outPath = ./.; rev = 1234; }
+{ nixpkgs ? <nixpkgs>, nixos ? <nixos>
+, nix ? { outPath = ../nix-export; rev = 1234; }
 , officialRelease ? false
 }:
 
@@ -140,6 +140,11 @@ let
     deb_ubuntu1010x86_64 = makeDeb_x86_64 (diskImageFuns: diskImageFuns.ubuntu1010x86_64) 50;
 
 
+    # System tests.
+    tests.remote_builds = (import ./tests/remote-builds.nix rec {
+      inherit nixpkgs nixos; nix = build { inherit system; }; system = "x86_64-linux";
+    }).test;
+
   };
 
 

tests/remote-builds.nix

@@ -0,0 +1,97 @@
+# Test Nix's remote build feature.
+
+{ nixpkgs, nixos, system, nix }:
+
+with import "${nixos}/lib/testing.nix" { inherit nixpkgs 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.
+      foreach my $slave ($slave1, $slave2) {
+          $slave->succeed("mkdir -m 700 /root/.ssh");
+          $slave->copyFileFromHost("key.pub", "/root/.ssh/authorized_keys");
+          $slave->waitForJob("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}");
+    '';
+
+})