I tried running git after the Mac OS Catalina upgrade and got this error.
xcrun: error: invalid active developer path (/Library/Developer/CommandLineTools),
missing xcrun at: /Library/Developer/CommandLineTools/usr/bin/xcrun
Here’s the fix. For some very odd reason, Apple does not automatically reinstall xcode after each Mac OS upgrade.
You will need to either reset it or install it again.
# Try reset first
xcode-select --reset
# Or install it if reset doesn't work
xcode-select --install
Close your terminal, and reopen and run git again.