b01c9624cf
This function is quite similar to runInLinuxVM, but also ensures that the builder is run decoupled of the Nix store and using the userland inside the VM. We're now picking up the environment variables saved in the previous commit. The reason we suppress all errors from the source operation is that it would emit a ton of errors because we're trying to set read-only variables. Also, detecting whether the origBuilder is using the default builder from the stdenv is currently a bit of a workaround until we have a specialized pseudo-cross-stdenv someday in the future[TM]. Signed-off-by: aszlig <aszlig@redmoonstudios.org>