I'm working on the transition to merged sbin in Fedora. While the transition is happening (and probably for a while after), we need to compile systemd with split-bin=true to support systems upgraded from previous versions. But when the system has been upgraded and already has /usr/sbin that is a symlink, be nice and give $PATH without sbin. We check for both /usr/sbin and /usr/local/sbin. If either exists and is not a symlink to ./bin, we retain previous behaviour. This means that if both are converted, we get the same behaviour as split-bin=false, and otherwise we get the same behaviour as before. sd-path uses the same logic. This is not a hot path, so I got rid of the nulstr macros that duplicated the logic.
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