#!/bin/bash

#

# prepare_updatePackages.sh -- This function verifies the required

# packages your workstation needs to have installed in order for

# `centos-art.sh' script to run correctly. If there is one or more

# missing packages, the `centos-art.sh' script asks you to confirm

# their installation through `sudo yum'.

#

# Copyright (C) 2009, 2010, 2011 The CentOS Project

#

# This program is free software; you can redistribute it and/or modify

# it under the terms of the GNU General Public License as published by

# the Free Software Foundation; either version 2 of the License, 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, write to the Free Software

# Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

#

# ----------------------------------------------------------------------

# $Id$

# ----------------------------------------------------------------------

function prepare_updatePackages {

    local PACKAGE=''

    local PACKAGES=''

    local PACKAGES_THIRDS=''

    local -a PACKAGES_MISSING

    local -a PACKAGES_INSTALL

    local RPM='/bin/rpm'

    local YUM='/usr/bin/yum'

    local YUM_OPTIONS=''

    # Check execution rights of package managers.

    cli_checkFiles $RPM --execution

    cli_checkFiles $YUM --execution

    # Define required packages needed by centos-art.sh script.

    PACKAGES="inkscape ImageMagick netpbm netpbm-progs syslinux gimp

        coreutils texinfo info tetex-latex tetex-fonts tetex-xdvi

        tetex-dvips gettext texi2html gnome-doc-utils elinks

        docbook-style-xsl docbook-utils docbook-dtds

        docbook-style-dsssl docbook-simple docbook-utils-pdf

        docbook-slides firefox sudo yum rpm ctags"

    # Define packages from third party repositories (i.e., packages

    # not included in CentOS [base] repository.) required by

    # centos-art to work as expected.

    PACKAGES_THIRDS="(inkscape|blender)"

    # Build list of installed and missing packages.

    for PACKAGE in $PACKAGES;do

        $RPM -q --queryformat "%{NAME}\n" $PACKAGE --quiet

        if [[ $? -ne 0 ]];then

            PACKAGES_MISSING[((++${#PACKAGES_MISSING[*]}))]=$PACKAGE

        else

            PACKAGES_INSTALL[((++${#PACKAGES_INSTALL[*]}))]=$PACKAGE

        fi

    done

    # Define relation between centos-art.sh options and yum options.

    [[ $FLAG_ANSWER == 'true' ]] && YUM_OPTIONS="${YUM_OPTIONS} -y"

    [[ $FLAG_QUIET  == 'true' ]] && YUM_OPTIONS="${YUM_OPTIONS} -q"

    # Use `sudo yum' to install missing packages in your workstation.

    if [[ ${#PACKAGES_MISSING[*]} -gt 0 ]];then

        sudo ${YUM} ${YUM_OPTIONS} install ${PACKAGES_MISSING[*]}

    fi

    # Use `sudo yum' to update installed packages in your workstation.

    if [[ ${#PACKAGES_INSTALL[*]} -gt 0 ]];then

        sudo ${YUM} ${YUM_OPTIONS} update ${PACKAGES_INSTALL[*]}

    fi

}