Ludovic Courtès 00b9ab0a83
tests: root-unmount: Wait for the first QEMU process to finish.
There was a tiny possibility that the first QEMU process would still be
running by the time we launch the second one.

* gnu/build/marionette.scm (marionette-pid): Export.
* gnu/tests/base.scm (run-root-unmount-test)[test]: Add 'waitpid' call.
2022-11-17 11:10:09 +01:00
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