Improve ifup script UX #21
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Without the shell option, if there is any error (e.g. brctl not installed), QEMU will boot regardless. In such case, the error may go unnoticed, given the amount of information dumped on the screen by the boot sequence.
In Ubuntu [20.04] for example, the package is not installed by default.
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Currently, the ifup script doesn't fail even if the commands run do. The problem with this is that problems can go unnoticed, since the VM boot immediatley prints a wall of text.
This PR makes the VM startup fail if anything in the script fail, and it also gives (marginally) more helpful information in case the bridge tool is not found.