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A few more details that I've managed to suss out. The Data volume is mounted on /System/Volumes/Data. Currently, there are 21 firm links into it. They are enume

by dunham 7y ago

A few more details that I've managed to suss out. The Data volume is mounted on /System/Volumes/Data. Currently, there are 21 firm links into it. They are enumerated in /usr/share/firmlinks (included below). /AppleInternal Device/AppleInternal /Applications Device/Applications /Library Device/Library /System/Library/Caches Device/System/Library/Caches /System/Library/Assets Device/System/Library/Assets /System/Library/PreinstalledAssets Device/System/Library/PreinstalledAssets /System/Library/AssetsV2 Device/System/Library/AssetsV2 /System/Library/PreinstalledAssetsV2 Device/System/Library/PreinstalledAssetsV2 /System/Library/CoreServices/CoreTypes.bundle/Contents/Library Device/System/Library/CoreServices/CoreTypes.bundle/Contents/Library /System/Library/Speech Device/System/Library/Speech /Users Users /Volumes Device/Volumes /cores Device/cores /home Device/home /mnt Device/mnt /opt Device/opt /private Device/private /sw Device/sw /usr/local Device/usr/local /usr/libexec/cups Device/usr/libexec/cups /usr/share/snmp Device/usr/share/snmp

matthewbauer 7y ago
It's interesting that /usr/X11 isn't in that list!
- klodolph 7y ago
  Well, X11 hasn't been provided by Apple since 10.8, about 7 years ago. So it wouldn't be touched by OS upgrades anyway (it's a separate product).
  - matthewbauer 7y ago
    /sw isn't provided by Apple either, but they provide it so that Fink will work.
- dunham 7y ago
  On my older High Sierra box, /usr/X11 is a symlink to /opt/X11. Catalina ships with /usr/X11 symlinked to ../private/var/select/X11. So it should still be possible to get X11 to work.