Self-updating bash script

script.sh

#!/usr/bin/env bash
VERSION="0.0.2"
SCRIPT_URL='https://gist.github.com/cubedtear/54434fc66439fc4e04e28bd658189701/raw'
SCRIPT_DESCRIPTION=""
SCRIPT_LOCATION="${BASH_SOURCE[@]}"

rm -f updater.sh

function update()
{
    TMP_FILE=$(mktemp -p "" "XXXXX.sh")
    curl -s -L "$SCRIPT_URL" > "$TMP_FILE"
    NEW_VER=$(grep "^VERSION" "$TMP_FILE" | awk -F'[="]' '{print $3}')
    ABS_SCRIPT_PATH=$(readlink -f "$SCRIPT_LOCATION")
    if [ "$VERSION" \< "$NEW_VER" ]
    then
        printf "Updating script \e[31;1m%s\e[0m -> \e[32;1m%s\e[0m\n" "$VERSION" "$NEW_VER"

        echo "cp \"$TMP_FILE\" \"$ABS_SCRIPT_PATH\"" > updater.sh
        echo "rm -f \"$TMP_FILE\"" >> updater.sh
        echo "echo Running script again: `basename ${BASH_SOURCE[@]}` $@" >> updater.sh
        echo "exec \"$ABS_SCRIPT_PATH\" \"$@\"" >> updater.sh

        chmod +x updater.sh
        chmod +x "$TMP_FILE"
        exec updater.sh
    else
        rm -f "$TMP_FILE"
    fi
}

update "$@"

echo "$@"

SCRIPT_DESCRIPTION is unused and could be removed
${BASH_SOURCE[@]} double quote array expansions to avoid re-splitting elements

SCRIPT_DESCRIPTION is unused and could be removed

It is intended as a placeholder in order to remember to describe the scripts usage. A comment would be enough, but they are easily forgotten.

Thanks for a very good script.
I have a few suggestions tho.

1. add a check for curl
   which curls > /dev/null 2>&1 || echo "curl not found"

2. check for curl download failure and add logic to skip if there is no internet connection
   curl --connect-timeout 5 ....

3. Your version comparison would fail: ie.
   "1.10.1" < "1.2.1" will return true, when it is not.
   There are a few technique to compare versions on the internet. just google it.

4. update.sh is hardcoded too many times. puting it in a local variable would be better.