1#!/bin/sh23. git-sh-setup-script || die "Not a git archive"45branchname="$1"6rev=$(git-rev-parse --verify --default HEAD "$2"^0) || exit78[ -z "$branchname" ] && die "git branch: I want a branch name"9[ -e "$GIT_DIR/refs/heads/$branchname" ] && die "$branchname already exists"1011echo $rev > "$GIT_DIR/refs/heads/$branchname"