scripts/toolboxrun

#!/usr/bin/env bash
toolboxrun () {

    _printHelpAndExit () {

        cat <<-'EOF'
USAGE
    toolboxrun -c NAME [-i NAME] [-r RELEASE] [--no-sh] [-h] [-s] [-d] [COMMANDS [ARGS...]]

COMMANDS

    COMMANDS to run in the container (e.g. the current active file, an external
    build script, a program residing in the container, etc.)
    Can be empty (default entrypoint)

OPTIONS

    --container NAME, -c NAME
        Assign  a  different  NAME  to the toolbox container. This is useful for creating multiple
        toolbox containers from the same base image, or for entirely  customized  containers  from
        custom-built base images.

        If the toolbox container NAME already exists, the command passed to toolboxRun will be
        executed in the existing toolbox. If toolbox container NAME does not exist, it will be
        created and the COMMAND will then be run in it.

    --image NAME, -i NAME
        Change the NAME of the base image used to create the toolbox container. This is useful for
        creating containers from custom-built base images.

    --release RELEASE, -r RELEASE
        Create a toolbox container for a different operating system RELEASE than the host.

    --ephemeral
        The toolbox will be removed after the COMMAND is executed

    --recreate
        If the toolbox NAME already exists, it will first be removed and recreated

    --no-sh, -n
        Do not wrap COMMANDS in 'sh -c'

    --help, -h
        Print this help message and exit (overrides --silent)

EOF

        # Exit using passed exit code
        [[ -z $1 ]] && exit 0 || exit "$1"
    }


    _parseInput () {

        # Parse input and set switches using getopt
        if _input=$(getopt -o +c:i:r:nh -l container:,image:,release:,ephemeral,recreate,no-sh,help -- "$@"); then
            eval set -- "$_input"
            while true; do
                case "$1" in
                    --container|-c)
                        shift && export _cname="$1"
                        ;;
                    --image|-i)
                        shift && export _image=("-i" "$1")
                        ;;
                    --release|-r)
                        shift && export _release=("-r" "$1")
                        ;;
                    --ephemeral)
                        export _ephemeral="true"
                        ;;
                    --recreate)
                        export _recreate="true"
                        ;;
                    --no-sh|-n)
                        export _no_sh="true"
                        ;;
                    --help|-h)
                        _printHelpAndExit 0
                        ;;
                    --)
                        shift
                        break
                        ;;
                esac
                shift
            done
        else
            echo "Incorrect options provided"
            _printHelpAndExit 1
        fi

        # Create _pre_commands_array from remaining arguments
        # shift getopt parameters away
        shift $((OPTIND - 1))
        # Assume program name is first argument
        export _program="$1"
        # create command array
        declare -ga _cmd_array=("$@")
    }


    _shWrap () { [[ -z $_no_sh ]] && _cmd_array=("sh" "-c" "${_cmd_array[*]}"); }
    _toolboxExists () { toolbox list -c | cut -d ' ' -f 3 | grep -w "$1" > /dev/null 2>&1; }
    _toolboxCreate () { toolbox create -c "$1" "${_image[@]}" "${_release[@]}"; }
    _toolboxRemove () { toolbox rm -f "$1"; }
    _toolboxRun () { toolbox run -c "$1" "${_cmd_array[@]}"; }


    __main () {

        # Get input
        _parseInput "$@"
        # Wrap command with `sh -c` by default
        [[ -z $_no_sh ]] && _shWrap
        # Check if container exists
        if _toolboxExists "$_cname"; then
            if [[ -n $_recreate || -n $_ephemeral ]]; then
                _toolboxRemove "$_cname"
            fi
        else
            _toolboxCreate "$_cname"
        fi

        _toolboxRun "$_cname" && export _ec="$?"

        [[ -n $_ephemeral ]] && _toolboxRemove "$_cname"
    }

    # Allow this function to be executed directly
    __main "$@"
}

if [[ "${BASH_SOURCE[0]}" == "${0}" ]]; then
    toolboxrun "$@"
    exit "$_ec"
fi