nix-build: extend the meaning of $IN_NIX_SHELL

An equivalent was originally filed against the perl version: NixOS#933
vcunat · Aug 11, 2016 · 1bffd83 · 1bffd83
1 parent 80ebc55
commit 1bffd83
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/src/nix-build/nix-build.cc b/src/nix-build/nix-build.cc
@@ -332,7 +332,7 @@ int main(int argc, char ** argv)
         }
 
         if (runEnv)
-            setenv("IN_NIX_SHELL", "1", 1);
+            setenv("IN_NIX_SHELL", pure ? "pure" : "impure", 1);
 
         for (auto & expr : exprs) {
             // Instantiate.