Test cabalProject when src is a non store path (#752)

Author: hamishmack

.buildkite/pipeline.yml

@@ -33,3 +33,8 @@ steps:
     command:
       - nix-build build.nix -A maintainer-scripts.check-materialization-concurrency -o check-materialization-concurrency.sh
       - ./check-materialization-concurrency.sh
+
+  - label: 'Make sure non store paths like can be used as src'
+    command:
+      - nix-build build.nix -A maintainer-scripts.check-path-support -o check-path-support.sh
+      - ./check-path-support.sh

build.nix

@@ -55,6 +55,7 @@ in rec {
       ];
     };
     check-materialization-concurrency = pkgs.buildPackages.callPackage ./scripts/check-materialization-concurrency/check.nix {};
+    check-path-support = pkgs.buildPackages.callPackage ./scripts/check-path-support.nix {};
   };
 
   # These are pure parts of maintainer-script so they can be built by hydra

scripts/check-path-support.nix

@@ -0,0 +1,13 @@
+{ stdenv, writeScript, nix }:
+
+with stdenv.lib;
+
+writeScript "check-path-supprot.sh" ''
+  #!${stdenv.shell}
+
+  set -euo pipefail
+
+  export PATH="${makeBinPath [ nix ]}"
+
+  nix-build -E '((import ./. {}).pkgs.haskell-nix.cabalProject { compiler-nix-name = "ghc865"; src = ./test/cabal-simple; }).cabal-simple.components.library'
+''