runInFHSUserEnv: init

pkgs/build-support/run-in-fhs/default.nix

@@ -0,0 +1,15 @@
+{ lib, buildFHSUserEnv }:
+
+# Similar to runInLinuxVM, except we run under a FHS user env instead
+# of a VM. This allows you to use build systems that depend on the FHS
+# without any sort of patching. Resulting binaries may not work on
+# NixOS without wrapping them in FHS though.
+drv: envArgs: let
+  fhsWrapper = buildFHSUserEnv ({
+    name = "${drv.name}-fhs-wrapper";
+    runScript = "$@";
+  } // envArgs);
+in lib.overrideDerivation drv (old: {
+  builder = "${fhsWrapper}/bin/${fhsWrapper.name}";
+  args = [old.builder] ++ old.args;
+})

pkgs/top-level/all-packages.nix

@@ -306,6 +306,7 @@ with pkgs;
   buildFHSUserEnv = buildFHSUserEnvChroot;
   buildFHSUserEnvChroot = callPackage ../build-support/build-fhs-userenv { };
   buildFHSUserEnvBubblewrap = callPackage ../build-support/build-fhs-userenv-bubblewrap { };
+  runInFHSUserEnv = callPackage ../build-support/run-in-fhs { };
 
   buildMaven = callPackage ../build-support/build-maven.nix {};