#!/bin/bash

# Copyright 2012 Universidad Nacional de Cordoba

# Written by Tomas Cohen Arazi

#            Mark Tompsett

#

# This file is part of Koha.

#

# Koha 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.

#

# Koha 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 Koha; if not, write to the Free Software Foundation, Inc.,

# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.

# Output simple help

usage() {

    local scriptname=$(basename $0)

    cat <<EOF

$scriptname

Query for missing dependencies. Print the install command for them if specified.

Usage:

$scriptname -r

$scriptname -ic

$scriptname -h

    -r  | --report             Report the status of Koha's dependencies

    -ic | --install-command    Display the install command for the missing dependencies

    -h  | --help               Display this help message

EOF

}

# Check if the package is installed

packageInstalled() {

    local package=$1

    local package_status=`dpkg-query --showformat='${Status}' \

                          -W $package 2> /dev/null`

    if [ "$package_status" == "install ok installed" ] ; then

        echo "yes"

    else

        echo "no"

    fi

}

# Get the installed package version

getPackageVersion() {

    local package=$1

    dpkg-query --showformat='${Version}' -W $package

}

# A parameter is required.

if [ "$#" -eq "0" ]; then

    usage

    exit 1

fi

# Initialize variables

CHECK=no

INSTALLCMD=no

HELP=no

# Loop over parameters

while (( "$#" )); do

    case $1 in

        -r | --report )

            CHECK=yes

            ;;

        -ic | --install-command )

            INSTALLCMD=yes

            ;;

        -h | --help)

            HELP=yes

            ;;

        * )

            usage

            exit 1

    esac

    shift

done

if [ "$HELP" = "yes" ]; then

    usage

    exit 0

fi

# Determine what directory this script is in, the packages files

# should be in the same path.

DIR=`dirname $0`

# Determine the Ubuntu release

UBUNTU_RELEASE=`lsb_release -r | cut -f2 -d'	'`

UBUNTU_PACKAGES_FILE=$DIR/ubuntu.$UBUNTU_RELEASE.packages

# Check for the release-specific packages file. Default to the general one

# but warn the user about LTS releases recommended, if they are attempting

# to do an install command option.

if [ ! -e $UBUNTU_PACKAGES_FILE ]; then

    UBUNTU_PACKAGES_FILE=$DIR/ubuntu.packages

    if [ "$INSTALLCMD" == "yes" ]; then

        echo "# There's no packages file for your distro/release"

        echo "# WARNING! We strongly recommend an LTS release."

    fi

fi

# We where asked to print the packages list and current versions (if any)

UBUNTU_PACKAGES=`awk '{print $1}' $UBUNTU_PACKAGES_FILE | grep -v '^\s*#' | grep -v '^\s*$'`

# Only output this on an install command option in order to maintain

# output equivalence to the former script, in the case of reporting

# only.

if [ "$INSTALLCMD" == "yes" ]; then

    # Tell them which file being used to determine the output.

    echo "# Using the $UBUNTU_PACKAGES_FILE file as source"

    # Comment for skiping the dots if needed ....

    if [ "$CHECK" == "no" ]; then

        echo -n "#"

    fi

fi

# Initialize variable to accumulate missing packages in.

MISSING_PACKAGES=""

# Loop used to accumulate the missing packages and display package information if requested to report.

for PACKAGE in $UBUNTU_PACKAGES; do

    # If an install command option is running, but not a report option,

    # There is no need to determine the version number. If it was

    # This would run even slower!

    # Test if the package is installed

    PACKAGE_INSTALLED=`packageInstalled $PACKAGE`

    # If we are supposed to report...

    if [ "$CHECK" == "yes" ]; then

        # Determine the package version if it is installed.

        if [ "$PACKAGE_INSTALLED" == "yes" ]; then

            PACKAGE_VERSION=`getPackageVersion $PACKAGE`

        # otherwise default to 'none'.

        else

            PACKAGE_VERSION="none"

        fi

        # report the package name and version number.

        echo "$PACKAGE = $PACKAGE_VERSION"

    # Otherwise, we'll just echo a dot for the impatient.

    else

        echo -n "."

    fi

done

# If we aren't reporting, then the last echo didn't have a newline.

if [ "$CHECK" != "yes" ]; then

    echo

fi

# If the install command was requested...

if [ "$INSTALLCMD" == "yes" ]; then

    # Give them a nicely indented command to copy, if dependencies are missing.

    if [ "${#MISSING_PACKAGES}" -gt "0" ]; then

        cat <<EOF

# Copy and paste the following command to install all Koha's dependencies on your system:

# Note: this command will run with admin privileges. Make sure your user has sudo rights

EOF

        echo -e "\tsudo apt-get install $MISSING_PACKAGES"

    # Otherwise tell them all is well.

    else

        echo -e "# All dependencies installed!"

        echo -e "# Please confirm the version numbers are sufficient"

        echo -e "# By running koha_perl_deps.pl -m -u."

    fi

fi

exit 0