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config: Require a new UTS namespace for config.json's hostname
The UTS namespace is for hostnames and NIS domain names [1]. Without a new namespace, the hostname entry would clobber the host environment's hostname. Clobbering the host's hostname or a joined-namespace's hostname might be acceptable for folks who trust their bundles, but it's not allowed by the "error out if the config specifies anything else related to that namespace" language that landed in 02b456e (Clarify behavior around namespaces paths, 2015-09-08, #158). [1]: http://man7.org/linux/man-pages/man7/namespaces.7.html Signed-off-by: W. Trevor King <wking@tremily.us>
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