Merge pull request #87414 from chkno/specify-shell-when-sudoing-to-user-with-unknown-shell

nixos/test-driver: Specify /bin/sh shell when running a bourne shell script as the user

nixos/lib/test-driver/test-driver.py

@@ -369,7 +369,7 @@ class Machine:
             q = q.replace("'", "\\'")
             return self.execute(
                 (
-                    "su -l {} -c "
+                    "su -l {} --shell /bin/sh -c "
                     "$'XDG_RUNTIME_DIR=/run/user/`id -u` "
                     "systemctl --user {}'"
                 ).format(user, q)