Lennart Poettering
3eb956700f
Add a new D-Bus method on org.freedesktop.hostname1 that incrementally updates the machine tags instead of replacing the whole list: it takes two string arrays, one of tags to add and one of tags to remove, and stores (current ∪ add) \ remove. This avoids the read-modify-write race that clients would otherwise hit when several of them each manage a subset of the host's tags. Factor the tag persistence and the write-error-to-D-Bus-error mapping out of method_set_tags() into helpers, and add a machine_tags_add_remove() helper for the set arithmetic, all to be shared with further callers.
System and Service Manager
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