$ curl -o- https://raw.githubusercontent.com/creationix/nvm/v0.33.8/install.sh | bash
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
100 12540 100 12540 0 0 43532 0 --:--:-- --:--:-- --:--:-- 43693
=> Downloading nvm from git to '/Users/peter/.nvm'
=> xcode-select: note: no developer tools were found at '/Applications/Xcode.app', requesting install. Choose an option in the dialog to download the command line developer tools.
Failed to clone nvm repo. Please report this!
It'll also open a dialog to ask about installing Xcode with command line tools or not:
The problem is because the path /usr/bin/git is actually the built-in Xcode, so nvm can find git successfully and assume git is installed and working.