nix develop: do not assume that saved vars are set

This fixes https://github.com/NixOS/nix/issues/6809
2022-07-14 23:25:39 -07:00
parent de287964d5
commit 04386f7d69
1 changed files with 3 additions and 1 deletions
@@ -288,8 +288,10 @@ struct Common : InstallableCommand, MixProfile

        out << "unset shellHook\n";

-        for (auto & var : savedVars)
+        for (auto & var : savedVars) {
+            out << fmt("%s=${%s:-}\n", var, var);
            out << fmt("nix_saved_%s=\"$%s\"\n", var, var);
+        }

        buildEnvironment.toBash(out, ignoreVars);