Catalina introduced a lot of security changes and the most intrusive is probably all the popups asking to give permission for apps to access directories under Home, like Documents. Worse still, apps which weren't written to handle the new security measures might just fail silently with no clues for the user. A solution is to give apps like Emacs "Full Disk Access" under "Security & Privacy" in Preferences, to give unfettered access to your files and avoid all the popups and silent failures. Sounds good, but that doesn't actually work for Emacs because "Emacs" in the app bundle is actually a Ruby script which decides which flavour of Emacs executable to run. This never mattered before, but it does under Catalina because MacOS thinks the executable is /usr/bin/ruby . Conventional wisdom is therefore to give "Full Disk Access" to Ruby. While this does work, I've always been uncomfortable giving all Ruby scripts full access...
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