get branch name in git hook post-receive

#!/bin/bash
echo "---------------------start post-receive :  `date`" >> ~/kuji.log

while read oldrev newrev ref
do
    branch=`echo $ref | sed 's/refs\/heads\///'`
    echo $ref >> ~/kuji.log
done

echo $branch >> ~/kuji.log

`git push origin --all --force` >> ~/kuji.log
git log -1 --stat HEAD >> ~/kuji.log




echo "end post-receive" >> ~/kuji.log