1 files changed, 108 insertions, 0 deletions
diff --git a/third_party/nix/tests/remote-builds.nix b/third_party/nix/tests/remote-builds.nix
new file mode 100644
index 000000000000..b867f13b4995
--- /dev/null
+++ b/third_party/nix/tests/remote-builds.nix
@@ -0,0 +1,108 @@
+# Test Nix's remote build feature.
+
+{ nixpkgs, system, nix }:
+
+with import (nixpkgs + "/nixos/lib/testing.nix") { inherit system; };
+
+makeTest (
+
+let
+
+  # The configuration of the remote builders.
+  builder =
+    { config, pkgs, ... }:
+    { services.openssh.enable = true;
+      virtualisation.writableStore = true;
+      nix.package = nix;
+      nix.useSandbox = true;
+    };
+
+  # 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" "if [ ${toString nr} = 5 ]; then echo FAIL; exit 1; fi; echo Hello; mkdir $out $foo; cat /proc/sys/kernel/hostname > $out/host; ln -s $out $foo/bar; sleep 10" ];
+        outputs = [ "out" "foo" ];
+      }
+    '';
+
+in
+
+{
+
+  nodes =
+    { builder1 = builder;
+      builder2 = builder;
+
+      client =
+        { config, pkgs, ... }:
+        { nix.maxJobs = 0; # force remote building
+          nix.distributedBuilds = true;
+          nix.buildMachines =
+            [ { hostName = "builder1";
+                sshUser = "root";
+                sshKey = "/root/.ssh/id_ed25519";
+                system = "i686-linux";
+                maxJobs = 1;
+              }
+              { hostName = "builder2";
+                sshUser = "root";
+                sshKey = "/root/.ssh/id_ed25519";
+                system = "i686-linux";
+                maxJobs = 1;
+              }
+            ];
+          virtualisation.writableStore = true;
+          virtualisation.pathsInNixDB = [ config.system.build.extraUtils ];
+          nix.package = nix;
+          nix.binaryCaches = [ ];
+          programs.ssh.extraConfig = "ConnectTimeout 30";
+        };
+    };
+
+  testScript = { nodes }:
+    ''
+      startAll;
+
+      # Create an SSH key on the client.
+      my $key = `${pkgs.openssh}/bin/ssh-keygen -t ed25519 -f key -N ""`;
+      $client->succeed("mkdir -p -m 700 /root/.ssh");
+      $client->copyFileFromHost("key", "/root/.ssh/id_ed25519");
+      $client->succeed("chmod 600 /root/.ssh/id_ed25519");
+
+      # Install the SSH key on the builders.
+      $client->waitForUnit("network.target");
+      foreach my $builder ($builder1, $builder2) {
+          $builder->succeed("mkdir -p -m 700 /root/.ssh");
+          $builder->copyFileFromHost("key.pub", "/root/.ssh/authorized_keys");
+          $builder->waitForUnit("sshd");
+          $client->succeed("ssh -o StrictHostKeyChecking=no " . $builder->name() . " 'echo hello world'");
+      }
+
+      # Perform a build and check that it was performed on the builder.
+      my $out = $client->succeed(
+        "nix-build ${expr nodes.client.config 1} 2> build-output",
+        "grep -q Hello build-output"
+      );
+      $builder1->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})\!out $(nix-instantiate ${expr nodes.client.config 3})\!out');
+      $builder1->succeed("test -e $out1 -o -e $out2");
+      $builder2->succeed("test -e $out1 -o -e $out2");
+
+      # And a failing build.
+      $client->fail("nix-build ${expr nodes.client.config 5}");
+
+      # Test whether the build hook automatically skips unavailable builders.
+      $builder1->block;
+      $client->succeed("nix-build ${expr nodes.client.config 4}");
+    '';
+
+})