Add a SetTags() method to the io.systemd.Hostname Varlink interface that combines what the D-Bus SetTags() and AddAndRemoveTags() methods do into a single call: it takes three tag lists, 'set', 'add' and 'remove'. If 'set' is supplied the tag list is first reset to it (an explicit empty array clears it), otherwise the current tags are used as basis; then the 'add' tags are added and the 'remove' tags are dropped. The set arithmetic is shared with the D-Bus AddAndRemoveTags() handler via machine_tags_add_remove(). Being reachable over Varlink (and hence socket-activatable without the system bus) this is usable very early at boot, before dbus-daemon is up.
System and Service Manager
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