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'
VERSION='1.0'

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

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

usage() {
    echo -e "JuJu: The portable GNU/Linux distribution"
    echo -e "Usage: $NAME [options]"
    echo -e "Options:"
    echo -e "-i, --setup-from-file <image>  Setup the JuJu image in ${JUJU_HOME}"
    echo -e "-f, --fakeroot                 Run JuJu with fakeroot privileges"
    echo -e "-r, --root                     Run JuJu with root privileges"
    echo -e "-b, --build-image              Build a JuJu image (must run in ArchLinux)"
    echo -e "-d, --delete                   Delete JuJu from ${JUJU_HOME}"
    echo -e "-h, --help                     Show this help message"
    echo -e "-v, --version                  Show the $NAME version"
}

version() {
    echo -e "JuJu ($VERSION): The portable GNU/Linux distribution"
    echo -e "Copyright (c) 2012-2014 Filippo Squillace <feel.squally@gmail.com>"
    echo -e "Homepage: http://github.com/fsquillace/juju"
}

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 JuJu 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 JuJu 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 JuJu version option must be used exclusively"
        fi
    fi

    if $OPT_FAKEROOT && $OPT_ROOT
    then
        die "You must access to JuJu with either fakeroot or root permissions"
    fi

	[ "$ARGS" != "" ] && die "No arguments are needed. For the CLI syntax run: $NAME --help"

    return 0
}


###################################
### MAIN PROGRAM                ###
###################################

TEMP=`getopt -o drfbi:hv --long delete,root,fakeroot,build-image,setup-from-file:,help,version -n 'juju' -- "$@"`

if [ $? != 0 ] ; then error "Error on parsing the command line. Try juju -h." ; exit ; fi

# Note the quotes around `$TEMP': they are essential!
eval set -- "$TEMP"

OPT_SETUP_FROM_FILE=false
IMAGE_FILE=""
OPT_FAKEROOT=false
OPT_ROOT=false
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 ;;
        -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 ;;
        *) error "Internal error!" ; exit 1 ;;
    esac
done

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

check_cli || exit 1

################ DEFINE ACTION ########################

$OPT_HELP && usage && exit
$OPT_VERSION && version && exit

if $OPT_BUILD_IMAGE; then
    build_image_juju
    exit
elif $OPT_DELETE; then
    delete_juju
    exit
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
elif $OPT_ROOT; then
    run_juju_as_root
else
    run_juju_as_user
fi

# vim: set ts=4 sw=4 noet: