From 097acae35bd99cebd6cdb22cd6e498f3a50951f1 Mon Sep 17 00:00:00 2001
From: eldritch horrors <pennae@lix.systems>
Date: Thu, 7 Mar 2024 02:58:26 +0100
Subject: tests/nixos: Test remote build against older versions

(cherry picked from commit e502d1cf945fb3cdd0ca1e1c16ec330ccab51c7b)
Change-Id: If6a1758b6457c5dae9305829c4d71d1905cfca22
---
 tests/nixos/default.nix              | 100 +++++++++++++++++++++++++++++++++++
 tests/nixos/remote-builds-ssh-ng.nix |  21 ++++++--
 tests/nixos/remote-builds.nix        |  21 ++++++--
 3 files changed, 136 insertions(+), 6 deletions(-)

diff --git a/tests/nixos/default.nix b/tests/nixos/default.nix
index 4c1cf785c..f2873f80e 100644
--- a/tests/nixos/default.nix
+++ b/tests/nixos/default.nix
@@ -14,6 +14,13 @@ let
     _module.args.nixpkgs = nixpkgs;
   };
 
+  # Checks that a NixOS configuration does not contain any references to our
+  # locally defined Nix version.
+  checkOverrideNixVersion = { pkgs, lib, ... }: {
+    # pkgs.nix: The new Nix in this repo
+    # We disallow it, to make sure we don't accidentally use it.
+    system.forbiddenDependenciesRegex = lib.strings.escapeRegex "nix-${pkgs.nix.version}";
+  };
 in
 
 {
@@ -21,8 +28,101 @@ in
 
   remoteBuilds = runNixOSTestFor "x86_64-linux" ./remote-builds.nix;
 
+  # Test our Nix as a client against remotes that are older
+
+  remoteBuilds_remote_2_3 = runNixOSTestFor "x86_64-linux" {
+    name = "remoteBuilds_remote_2_3";
+    imports = [ ./remote-builds.nix ];
+    builders.config = { lib, pkgs, ... }: {
+      imports = [ checkOverrideNixVersion ];
+      nix.package = lib.mkForce pkgs.nixVersions.nix_2_3;
+    };
+  };
+
+  remoteBuilds_remote_2_13 = runNixOSTestFor "x86_64-linux" ({ lib, pkgs, ... }: {
+    name = "remoteBuilds_remote_2_13";
+    imports = [ ./remote-builds.nix ];
+    builders.config = { lib, pkgs, ... }: {
+      imports = [ checkOverrideNixVersion ];
+      nix.package = lib.mkForce pkgs.nixVersions.nix_2_3;
+    };
+  });
+
+  # TODO: (nixpkgs update) remoteBuilds_remote_2_18 = ...
+
+  # Test our Nix as a builder for clients that are older
+
+  remoteBuilds_local_2_3 = runNixOSTestFor "x86_64-linux" ({ lib, pkgs, ... }: {
+    name = "remoteBuilds_local_2_3";
+    imports = [ ./remote-builds.nix ];
+    nodes.client = { lib, pkgs, ... }: {
+      imports = [ checkOverrideNixVersion ];
+      nix.package = lib.mkForce pkgs.nixVersions.nix_2_3;
+    };
+  });
+
+  remoteBuilds_local_2_13 = runNixOSTestFor "x86_64-linux" ({ lib, pkgs, ... }: {
+    name = "remoteBuilds_local_2_13";
+    imports = [ ./remote-builds.nix ];
+    nodes.client = { lib, pkgs, ... }: {
+      imports = [ checkOverrideNixVersion ];
+      nix.package = lib.mkForce pkgs.nixVersions.nix_2_13;
+    };
+  });
+
+  # TODO: (nixpkgs update) remoteBuilds_local_2_18 = ...
+
+  # End remoteBuilds tests
+
   remoteBuildsSshNg = runNixOSTestFor "x86_64-linux" ./remote-builds-ssh-ng.nix;
 
+  # Test our Nix as a client against remotes that are older
+
+  remoteBuildsSshNg_remote_2_3 = runNixOSTestFor "x86_64-linux" {
+    name = "remoteBuildsSshNg_remote_2_3";
+    imports = [ ./remote-builds-ssh-ng.nix ];
+    builders.config = { lib, pkgs, ... }: {
+      imports = [ checkOverrideNixVersion ];
+      nix.package = lib.mkForce pkgs.nixVersions.nix_2_3;
+    };
+  };
+
+  remoteBuildsSshNg_remote_2_13 = runNixOSTestFor "x86_64-linux" {
+    name = "remoteBuildsSshNg_remote_2_13";
+    imports = [ ./remote-builds-ssh-ng.nix ];
+    builders.config = { lib, pkgs, ... }: {
+      imports = [ checkOverrideNixVersion ];
+      nix.package = lib.mkForce pkgs.nixVersions.nix_2_13;
+    };
+  };
+  
+  # TODO: (nixpkgs update) remoteBuildsSshNg_remote_2_18 = ...
+
+  # Test our Nix as a builder for clients that are older
+
+  # FIXME: these tests don't work yet
+  /*
+  remoteBuildsSshNg_local_2_3 = runNixOSTestFor "x86_64-linux" ({ lib, pkgs, ... }: {
+    name = "remoteBuildsSshNg_local_2_3";
+    imports = [ ./remote-builds-ssh-ng.nix ];
+    nodes.client = { lib, pkgs, ... }: {
+      imports = [ checkOverrideNixVersion ];
+      nix.package = lib.mkForce pkgs.nixVersions.nix_2_3;
+    };
+  });
+
+  remoteBuildsSshNg_local_2_13 = runNixOSTestFor "x86_64-linux" ({ lib, pkgs, ... }: {
+    name = "remoteBuildsSshNg_local_2_13";
+    imports = [ ./remote-builds-ssh-ng.nix ];
+    nodes.client = { lib, pkgs, ... }: {
+      imports = [ checkOverrideNixVersion ];
+      nix.package = lib.mkForce pkgs.nixVersions.nix_2_13;
+    };
+  });
+
+  # TODO: (nixpkgs update) remoteBuildsSshNg_local_2_18 = ...
+  */
+
   nix-copy-closure = runNixOSTestFor "x86_64-linux" ./nix-copy-closure.nix;
 
   nix-copy = runNixOSTestFor "x86_64-linux" ./nix-copy.nix;
diff --git a/tests/nixos/remote-builds-ssh-ng.nix b/tests/nixos/remote-builds-ssh-ng.nix
index b59dde9bf..c75ad7253 100644
--- a/tests/nixos/remote-builds-ssh-ng.nix
+++ b/tests/nixos/remote-builds-ssh-ng.nix
@@ -1,4 +1,4 @@
-{ config, lib, hostPkgs, ... }:
+test@{ config, lib, hostPkgs, ... }:
 
 let
   pkgs = config.nodes.client.nixpkgs.pkgs;
@@ -28,12 +28,27 @@ let
 in
 
 {
-  name = "remote-builds-ssh-ng";
+  name = lib.mkDefault "remote-builds-ssh-ng";
+
+  # TODO expand module shorthand syntax instead of use imports
+  imports = [{
+    options = {
+      builders.config = lib.mkOption {
+        type = lib.types.deferredModule;
+        description = ''
+          Configuration to add to the builder nodes.
+        '';
+        default = { };
+      };
+    };
+  }];
 
   nodes =
     { builder =
       { config, pkgs, ... }:
-      { services.openssh.enable = true;
+      {
+        imports = [ test.config.builders.config ];
+        services.openssh.enable = true;
         virtualisation.writableStore = true;
         nix.settings.sandbox = true;
         nix.settings.substituters = lib.mkForce [ ];
diff --git a/tests/nixos/remote-builds.nix b/tests/nixos/remote-builds.nix
index 1c96cc787..eae1ccd88 100644
--- a/tests/nixos/remote-builds.nix
+++ b/tests/nixos/remote-builds.nix
@@ -1,6 +1,6 @@
 # Test Nix's remote build feature.
 
-{ config, lib, hostPkgs, ... }:
+test@{ config, lib, hostPkgs, ... }:
 
 let
   pkgs = config.nodes.client.nixpkgs.pkgs;
@@ -8,7 +8,9 @@ let
   # The configuration of the remote builders.
   builder =
     { config, pkgs, ... }:
-    { services.openssh.enable = true;
+    {
+      imports = [ test.config.builders.config ];
+      services.openssh.enable = true;
       virtualisation.writableStore = true;
       nix.settings.sandbox = true;
 
@@ -35,7 +37,20 @@ let
 in
 
 {
-  name = "remote-builds";
+  name = lib.mkDefault "remote-builds";
+
+  # TODO expand module shorthand syntax instead of use imports
+  imports = [{
+    options = {
+      builders.config = lib.mkOption {
+        type = lib.types.deferredModule;
+        description = ''
+          Configuration to add to the builder nodes.
+        '';
+        default = { };
+      };
+    };
+  }];
 
   nodes =
     { builder1 = builder;
-- 
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