Update buildout including all sources in src dir

update.sh

#!/bin/sh
spinner() {
    # thanks to: http://fitnr.com/showing-a-bash-spinner.html
    local pid=$1
    local delay=0.075
    local spinstr='|/-\'
    local infotext=$2
    while [ "$(ps a | awk '{print $1}' | grep $pid)" ]; do
        local temp=${spinstr#?}
        printf "[ %c  ] %s" "$spinstr" "$infotext"
        local spinstr=$temp${spinstr%"$temp"}
        sleep $delay
        printf "\b\b\b\b\b\b\b"
        for i in $(seq 1 ${#infotext}); do
            printf "\b"
        done
    done
    printf " \b\b\b\b"
}

function update {
    if [ ! -d $1/.git ]; then
        echo "[ \033[0;33mSKIP\033[0m ] $1 is not a git repository."
        exit 1
    fi
    cd $1

    DIRTY=`git status|grep 'modified:'`
    if [ ! -z "$DIRTY" ]; then
        git stash 1>/dev/null
        echo "- Stashed local changes for $1."
    fi
    git fetch --all 1>/dev/null &
    spinner $! "Fetching repository... "
    git pull --rebase=preserve 2>/dev/null
    if [ ! -z "$DIRTY" ]; then
        git stash pop 1>/dev/null
        echo "- Restored local changes for $1."
    fi
    echo "[ \033[0;32mOK\033[0m ] Rebased $1."
}

DIR=`pwd`
for REPOS in `ls $DIR/src`; do
    update $DIR/src/$REPOS
done

cd $DIR
update $DIR

symlink into your buildout root and run it using ./update.sh.