Restrict ssh to git

 cat /etc/shells

# /etc/shells: valid login shells

/bin/sh

/bin/dash

/bin/bash

/bin/rbash

/usr/bin/tmux

/usr/bin/screen

 

$ which git-shell

/usr/bin/git-shell

 

$ sudo nano /etc/shells (add  /usr/bin/git-shell)

$ sudo chsh git -s /usr/bin/git-shell