junest/bin/juju

#!/usr/bin/env bash
#
# This file is part of JuJu: The portable GNU/Linux distribution
#
# Copyright (c) 2012-2014 Filippo Squillace <feel.squally@gmail.com>
#
# This program is free software; you can redistribute it and/or modify it
# under the terms of the GNU Library General Public License as published
# by the Free Software Foundation; either version 2, or (at your option)
# any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.
#

NAME='JuJu'
CMD='juju'
VERSION='2.5.6'
CODE_NAME='Lion'
DESCRIPTION='The GNU/Linux distribution container for non-root users'
AUTHOR='Filippo Squillace <feel dot squally at gmail.com>'
HOMEPAGE='https://github.com/fsquillace/juju'
COPYRIGHT='2012-2014'

source "$(dirname $0)/../lib/core.sh"

###################################
### General functions           ###
###################################

usage() {
    echo -e "$NAME: $DESCRIPTION"
    echo -e "Usage: $CMD [options] [command]"
    echo -e "Options:"
    echo -e "-i, --setup-from-file <image>  Setup the $NAME image in ${JUJU_HOME}"
    echo -e "-f, --fakeroot                 Run $NAME with fakeroot privileges"
    echo -e "-r, --root                     Run $NAME with root privileges"
    echo -e "-p, --proot-args               Proot arguments"
    echo -e "-b, --build-image              Build a $NAME image (must run in ArchLinux)"
    echo -e "-d, --delete                   Delete $NAME from ${JUJU_HOME}"
    echo -e "-h, --help                     Show this help message"
    echo -e "-v, --version                  Show the $NAME version"
}

version() {
	echo -e "$NAME $VERSION ($CODE_NAME): $DESCRIPTION"
    echo -e "Copyright (c) $COPYRIGHT $AUTHOR"
    echo -e "Homepage: $HOMEPAGE"
}

check_cli(){
    if $OPT_BUILD_IMAGE
    then
        if $OPT_DELETE || $OPT_HELP || $OPT_VERSION || $OPT_SETUP_FROM_FILE || \
            $OPT_FAKEROOT || $OPT_ROOT
        then
            die "The build image option must be used exclusively"
        fi
    fi
    if $OPT_DELETE
    then
        if $OPT_BUILD_IMAGE || $OPT_HELP || $OPT_VERSION || $OPT_SETUP_FROM_FILE || \
            $OPT_FAKEROOT || $OPT_ROOT
        then
            die "The $NAME delete option must be used exclusively"
        fi
    fi
    if $OPT_HELP
    then
        if $OPT_BUILD_IMAGE || $OPT_DELETE || $OPT_VERSION || $OPT_SETUP_FROM_FILE || \
            $OPT_FAKEROOT || $OPT_ROOT
        then
            die "The $NAME help option must be used exclusively"
        fi
    fi
    if $OPT_VERSION
    then
        if $OPT_BUILD_IMAGE || $OPT_DELETE || $OPT_HELP || $OPT_SETUP_FROM_FILE || \
            $OPT_FAKEROOT || $OPT_ROOT
        then
            die "The $NAME version option must be used exclusively"
        fi
    fi
    if $OPT_FAKEROOT && $OPT_ROOT
    then
        die "You must access to $NAME with either fakeroot or root permissions"
    fi
    if $OPT_PROOT_ARGS
    then
        if $OPT_BUILD_IMAGE || $OPT_DELETE || $OPT_HELP || $OPT_SETUP_FROM_FILE || \
            $OPT_ROOT || $OPT_VERSION
        then
            die "Invalid syntax: Proot args are not allowed with the other options"
        fi
    fi
    if [ "$ARGS" != "" ]
    then
        if $OPT_BUILD_IMAGE || $OPT_DELETE || $OPT_HELP || $OPT_SETUP_FROM_FILE || \
            $OPT_VERSION
        then
            die "No arguments are needed. For the CLI syntax run: $CMD --help"
        fi
    fi

    return 0
}


function parse_arguments(){
    TEMP=$(getopt -o drp:fbi:hv --long delete,root,proot-args:,fakeroot,build-image,setup-from-file:,help,version -n "$CMD" -- "$@")
	eval set -- "$TEMP"

	OPT_SETUP_FROM_FILE=false
	IMAGE_FILE=""
	OPT_FAKEROOT=false
	OPT_ROOT=false
	OPT_PROOT_ARGS=false
	PROOT_ARGS=""
	OPT_BUILD_IMAGE=false
	OPT_DELETE=false
	OPT_HELP=false
	OPT_VERSION=false
	while true ; do
		case "$1" in
			-i|--setup-from-file) OPT_SETUP_FROM_FILE=true ; shift ; IMAGE_FILE=$1 ; shift ;;
			-f|--fakeroot) OPT_FAKEROOT=true ; shift ;;
			-r|--root) OPT_ROOT=true ; shift ;;
			-p|--proot-args) OPT_PROOT_ARGS=true ; shift ; PROOT_ARGS=$1; shift ;;
			-b|--build-image) OPT_BUILD_IMAGE=true ; shift ;;
			-d|--delete) OPT_DELETE=true ; shift ;;
			-h|--help) OPT_HELP=true ; shift ;;
			-v|--version) OPT_VERSION=true ; shift ;;
			--) shift ; break ;;
			*) die "Internal error!" ;;
		esac
	done

	ARGS=()
	for arg do
		ARGS+=($arg)
	done
}

function execute_operation(){
	$OPT_HELP && usage && return
	$OPT_VERSION && version && return

	if $OPT_BUILD_IMAGE; then
		build_image_juju
		return
	elif $OPT_DELETE; then
		delete_juju
		return
	fi

	if ! is_juju_installed
	then
		if $OPT_SETUP_FROM_FILE; then
			setup_from_file_juju $IMAGE_FILE
		else
			setup_juju
		fi
	elif $OPT_SETUP_FROM_FILE; then
		die "Error: The image cannot be installed since $JUJU_HOME is not empty."
	fi

	if $OPT_FAKEROOT; then
		run_juju_as_fakeroot "${PROOT_ARGS}" ${ARGS[@]}
	elif $OPT_ROOT; then
		run_juju_as_root ${ARGS[@]}
	else
		run_juju_as_user "${PROOT_ARGS}" ${ARGS[@]}
	fi
}

parse_arguments "$@"
check_cli
execute_operation
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