git pre-receive hook to decline non-signed commits

pre-receive

#!/bin/sh

status=0 

while read oldrev newrev refname
do
        git verify-commit "$newrev" 2>&- >&-

        if [ $? -ne 0 ]; then
                echo "[GPG] Missing signature"
                status=1
        else
                echo "[GPG] Signature verfied"
        fi
done

exit "$status";