Previously, we used either the fully split path or the fully merged path, treating "split sbin" as a boolean condition. The idea was that conversion to to merged bin would be a single event, so we don't need to care about the details of the transition. But it turns out that some systems may be converted in disparate steps. In https://bugzilla.redhat.com/show_bug.cgi?id=2400220, there was a lengthy discussion about a coreos system where /usr/local/{bin,sbin} were created as separate directories. Since /usr/local is not part of the packaged system, it might remain split for a longer time. So check /usr/local/s?bin separately and stop adding /usr/sbin to $PATH if only /usr/local/s?bin is split. (I don't think it makes sense to handle the reverse case, i.e. only /usr/s?bin being split, since that should be much rarer.) Inspired by https://bugzilla.redhat.com/show_bug.cgi?id=2400220.
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