Shell file for creating git server - restricts ssh commands to git only (probably not totally secure)

ssh-git.sh

#!/bin/bash
# To force particular keys to only use git, prefix their entry on authorized_keys with:
# command="/home/user/ssh-git.sh" ssh-ed25519 AAAAC3NzaC....

# Only allows git commands
if [ -z "$SSH_ORIGINAL_COMMAND" ] || [ "$SSH_ORIGINAL_COMMAND" = "${SSH_ORIGINAL_COMMAND#git-}" ]; then
 echo "Sorry, only git allowed"
else
 client_arr=( ${SSH_CLIENT} )
 client_ip=${client_arr[0]}
 resolve_arr=( $(dig +noall +answer -x ${client_ip}) )
 if [ -z "$resolve_arr" ]; then
  client_host=""
 else
  client_host=" [${resolve_arr[-1]}]"
 fi
 echo "$(date -Iseconds) ${SSH_ORIGINAL_COMMAND} (${SSH_CLIENT})${client_host}" >> ssh-git.log
 eval "$SSH_ORIGINAL_COMMAND"
fi