zbundle: bundle code and zip to have one unit of deployment

zbundle

#!/bin/bash
set -e
getopts "s" show && shift
if [[ $show == "s" ]]; then
    while read line; do
        hex="$(echo $line | od -N4 -x | head -1)"
        byte=(${hex})
        if [[ ${byte[1]} == "4b50" && ${byte[2]} == "0403" ]]; then
            break
        fi
        fragment="$fragment$newline$line"
        newline="\n"
    done < ${1:-/dev/stdin}
    echo -e $fragment
    exit
fi
if [[ -z "$2" ]]; then
    cat << EOF
$0 FRAGMENT FILE [FILES]...
$0 -s FILE.zip

Prefix a zip file created of FILEs with shell FRAGMENT.
The zip file is self extracting and after doing so it executes the shell fragment.
The name of the zip file is FILE.zip.

Note the first command of the script must be:
    unzip -qo $0 2>/dev/null

When the -s flag is given the shell fragment is echoed on standard output.
EOF
    exit
fi

fragment="$1"
shift
if ! grep -v '^#' "$fragment" | head -5 | grep -q 'unzip -qo \$0 2>/dev/null'; then
    echo "$0: command 'unzip -qo \$0 2>/dev/null' should be at the top of the fragment"
    exit
fi
cat $fragment <(zip - "$@") > "$1".zip && chmod +x "$1".zip
echo "$1".zip >&2