the quota of a the user indicated in User= via unit file settings, like the
other resource management concepts. Would mix nicely with DynamicUser=1
+* add dissect_image_warn() as a wrapper around dissect_image() that prints
+ friendly log messages for the returned errors, so that we don't have to
+ duplicate that in nspawn, systemd-dissect and PID 1.
+
* maybe set a new set of env vars for services, based on RuntimeDirectory=,
StateDirectory=, LogsDirectory=, CacheDirectory= and ConfigurationDirectory=
automatically. For example, there could be $RUNTIME_DIRECTORY,