I am having the same exact issue as described here, which is now closed:
I noticed this after upgrading my Macbook to Catalina.
Git is installed:
(base) QST-ML-0208:~ btibert$ whereis git /usr/bin/git
Rstudio recognizes git
But the project open within Rstudio does not
And last but not, least I previously managed this project via git prior to the upgrade. Worth noting is that I actually uninstalled Rstudio this morning, and reinstalled it just now, no dice.
Proof this is a git project on my machine:
My system info:
> Sys.info() sysname "Darwin" release "19.2.0" version "Darwin Kernel Version 19.2.0: Sat Nov 9 03:47:04 PST 2019; root:xnu-6153.61.1~20/RELEASE_X86_64" nodename "QST-ML-0208.ad.bu.edu" machine "x86_64" login "btibert" user "btibert" effective_user "btibert"