feat(tvix/cli): introduce mkNixpkgsEvalCheck, add outPath check r/6189

This introduces a function that can be instantiated with an attribute
path to instantiate, as well as the expected path (normally interpolated
with the nix evaluator).

Check both pkgs.stdenv.drvPath and pkgs.stdenv.outPath to match.

Change-Id: Id667ed35fa159ff83fedb3017ef8d3271aa42695
Reviewed-on: https://cl.tvl.fyi/c/depot/+/8606
Reviewed-by: tazjin <tazjin@tvl.su>
Autosubmit: flokli <flokli@flokli.de>
Tested-by: BuildkiteCI

1 files changed, 23 insertions, 16 deletions

diff --git a/tvix/cli/default.nix b/tvix/cli/default.nix
index 96a1b73668..03c01ddc77 100644
--- a/tvix/cli/default.nix
+++ b/tvix/cli/default.nix
@@ -1,25 +1,32 @@
 { depot, pkgs, lib, ... }:
 
+let
+  mkNixpkgsEvalCheck = attrset: expectedPath: {
+    label = ":nix: evaluate nixpkgs.${attrset} in tvix";
+    needsOutput = true;
+
+    command = pkgs.writeShellScript "tvix-eval-${builtins.replaceStrings [".drv"] ["-drv"] attrset}" ''
+      TVIX_OUTPUT=$(result/bin/tvix -E '(import ${pkgs.path} {}).${attrset}')
+      EXPECTED='${/* the verbatim expected Tvix output: */ "=> \"${expectedPath}\" :: string"}'
+
+      echo "Tvix output: ''${TVIX_OUTPUT}"
+      if [ "$TVIX_OUTPUT" != "$EXPECTED" ]; then
+        echo "Correct would have been ''${EXPECTED}"
+        exit 1
+      fi
+
+      echo "Output was correct."
+    '';
+  };
+in
+
 (depot.tvix.crates.workspaceMembers.tvix-cli.build.override {
   runTests = true;
 }).overrideAttrs (_: {
   meta = {
-    ci.extraSteps.eval-nixpkgs-stdenv = {
-      label = ":nix: evaluate nixpkgs.stdenv in tvix";
-      needsOutput = true;
-
-      command = pkgs.writeShellScript "tvix-eval-stdenv" ''
-        TVIX_OUTPUT=$(result/bin/tvix -E '(import ${pkgs.path} {}).stdenv.drvPath')
-        EXPECTED='${/* the verbatim expected Tvix output: */ "=> \"${pkgs.stdenv.drvPath}\" :: string"}'
-
-        echo "Tvix output: ''${TVIX_OUTPUT}"
-        if [ "$TVIX_OUTPUT" != "$EXPECTED" ]; then
-          echo "Correct would have been ''${EXPECTED}"
-          exit 1
-        fi
-
-        echo "Output was correct."
-      '';
+    ci.extraSteps = {
+      eval-nixpkgs-stdenv-drvpath = (mkNixpkgsEvalCheck "stdenv.drvPath" pkgs.stdenv.drvPath);
+      eval-nixpkgs-stdenv-outpath = (mkNixpkgsEvalCheck "stdenv.outPath" pkgs.stdenv.outPath);
     };
   };
 })