Ludovic Courtès be6520e6a5 vm: Distinguish between success and failure of the guest code. ...

Fixes <https://bugs.gnu.org/34276>.
Reported by Tobias Geerinckx-Rice <me@tobias.gr>.

* gnu/system/vm.scm (expression->derivation-in-linux-vm)[loader]:
Produce '/xchg/.exit-status' file upon success.
* gnu/build/vm.scm (load-in-linux-vm): Check for 'xchg/.exit-status'
once QEMU has completed and respond accordingly.

2020-03-26 23:45:41 +01:00

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