Add --dependents option to qvm-shutdown and qvm-kill

[tasket]

Qubes OS version:

R4.0

Affected component(s):

dom0 tools

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Steps to reproduce the behavior:

Expected behavior:

Actual behavior:

General notes:

Having a way to shutdown all the dependent VMs of a particular VM that requires shutdown would be a time saver. For example, when sys-net locks up after wake, or when a template change must take effect for one or more upstream VMs, a user could:

qvm-shutdown --dependents sys-net

The dependencies would trace the netvm prefs of the target VM in reverse. But this might not be limited to netvm, depending on whether other VM associations are enforced in the future.

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Related issues: