From 04c9ee6a1b53ee3b34ed9b48c0c17c001627aa75 Mon Sep 17 00:00:00 2001
From: Mayeu <m@mayeu.me>
Date: Sat, 9 May 2026 19:03:42 +0200
Subject: [PATCH 1/2] feat: add build action to nixostests blocktype

Reuses the generic actions.build (same pattern as installables,
runnables, devshells, containers). Lets downstream registries set
ci.build = 1 on nixostests blocks so std-action's proviso skips
targets whose test derivation is already cached, instead of
re-running the VM driver every time via ci.run = 1.

The interactive `run`/`run-vm`/`run-vm+` actions are unchanged.
---
 src/std/fwlib/blockTypes/nixostests.nix | 2 ++
 tests/bt-blocktypes/expr.nix            | 2 ++
 2 files changed, 4 insertions(+)

diff --git a/src/std/fwlib/blockTypes/nixostests.nix b/src/std/fwlib/blockTypes/nixostests.nix
index bcb7dd5c..00082e39 100644
--- a/src/std/fwlib/blockTypes/nixostests.nix
+++ b/src/std/fwlib/blockTypes/nixostests.nix
@@ -7,6 +7,7 @@ Use the NixosTests Blocktype in order to instrucement nixos
 vm-based test inside your reporisory.
 
 Available actions:
+  - build
   - run
   - run-vm
   - audit-script
@@ -32,6 +33,7 @@ in
       inherit (pkgs.stdenv) isLinux;
     in
       [
+        (actions.build currentSystem target)
         (mkCommand currentSystem "run" "run tests in headless vm" [] ''
           # ${target.driver}
           ${target.driver}/bin/nixos-test-driver
diff --git a/tests/bt-blocktypes/expr.nix b/tests/bt-blocktypes/expr.nix
index d2c3dbba..9ba079c2 100644
--- a/tests/bt-blocktypes/expr.nix
+++ b/tests/bt-blocktypes/expr.nix
@@ -33,6 +33,8 @@
       configFile = "path/to/configFile";
     };
     nixostests = {
+      drvPath = "drvPath";
+      outPath = "outPath";
       driver = "driver";
       driverInteractive = "driverInteractive";
     };

From a37805b7205cef9bf72a71f61f1ef20d58d49e89 Mon Sep 17 00:00:00 2001
From: Mayeu <m@mayeu.me>
Date: Sat, 9 May 2026 19:04:46 +0200
Subject: [PATCH 2/2] test: snapshot nixostests build action

Updates the bt-blocktypes namaka snapshot with the new `build`
entry under `nixostests.actions`.
---
 tests/_snapshots/bt-blocktypes | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/tests/_snapshots/bt-blocktypes b/tests/_snapshots/bt-blocktypes
index 627e4465..16e9aea9 100644
--- a/tests/_snapshots/bt-blocktypes
+++ b/tests/_snapshots/bt-blocktypes
@@ -255,6 +255,13 @@
   };
   nixostests = {
     actions = [
+      {
+        command = <derivation build>;
+        description = "build it";
+        name = "build";
+        proviso = "std/fwlib/actions/build-proviso.sh";
+        targetDrv = "drvPath";
+      }
       {
         command = <derivation run>;
         description = "run tests in headless vm";