Andy Fowler ae9c3e28d6 Fix #10961 NFS sharing in macOS 10.15 host
On OS X 10.15, / is read-only and paths inside of /Users (and elsewhere)
are mounted via a "firmlink" (which is a new invention in APFS). These
must be resolved to their full path to be shareable via NFS.

/Users/johnsmith/mycode  =>  /System/Volumes/Data/Users/johnsmith/mycode

We check to see if a path is mounted here with `df`, and prepend it.

Firmlinks are only createable by the OS and this wasn't supposed to be
visible to applications anyway:
https://developer.apple.com/videos/play/wwdc2019/710/?time=481
2019-10-08 13:21:34 -07:00
..

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