This file is indexed.

/usr/bin/git-fresh-branch is in git-extras 1.9.1-2.

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The actual contents of the file can be viewed below.

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#!/bin/sh

branch=$1

test -z $branch && echo "branch required." 1>&2 && exit 1

changes=`git status --porcelain`

clean()
{
    git symbolic-ref HEAD refs/heads/$branch
    rm .git/index
    git clean -fdx
}

if [ ! -z "$changes" ]; then
    read -p "All untracked changes will be lost. Continue [y/N]? " res
    case $res in
        [Yy]* ) clean; break;;
        * ) exit 0;;
    esac
fi

clean