Add qubes.ShowTerminal service

qubes-rpc-policy/qubes.ShowTerminal

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+## Note that policy parsing stops at the first match,
+## so adding anything below "$anyvm $anyvm action" line will have no effect
+
+## Please use a single # to start your custom comments
+
+$anyvm	$anyvm	deny,target=dom0
+
+# WARNING: The qubes.ShowTerminal service is dangerous and allows any
+# qube to access any other qube console. It should be restricted
+# only to management/admin qubes. This is why the default policy is 'deny'
+
+# Example of policy: mgmtvm $tag:created-by-mgmtvm allow,target=dom0

qubes-rpc/qubes.ShowTerminal

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+#!/bin/bash
+
+lock="/var/run/qubes/$QREXEC_REQUESTED_TARGET.terminal.lock"
+
+# Create an exclusive lock to ensure that multiple qubes cannot access to the same socket
+# In the case of multiple qrexec calls it returns a specific exit code
+sudo flock -n -E 200 -x "$lock" socat - OPEN:"$(virsh -c xen ttyconsole "$QREXEC_REQUESTED_TARGET")"