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#!/bin/bash
#  pkgbuild-check-nonfree
#  Copyright 2010 Joshua Ismael Haase Hernández, Joseph Graham

#  ---------- GNU General Public License 3 ----------

#  This file is part of Parabola.

#  Parabola 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 3 of the License, or
#  (at your option) any later version.

#  Parabola 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 Parabola.  If not, see <http://www.gnu.org/licenses/>.

# function log_end {
#     kill "$teepid"
#     rm "$logpipe"
# }

# function log {
#     LOG="pkgbuild-check-nonfree-$(date -u +%Y%m%d).log"
#     # ensure overridden package variables survive tee with split packages
#     logpipe="$(mktemp -u "$startdir/logpipe.XXXXXXXX")"
#     mkfifo "$logpipe"
#     tee "$LOG" < "$logpipe" &
#     teepid=$!
#     trap log_end ERR EXIT
# }


function unset_pkgbuild {

    unset 'pkgbase' 'pkgname' 'pkgver' 'pkgrel' 'epoch' 'pkgdesc' \
        'arch' 'url' 'license' 'groups' 'optdepends' 'provides' \
        'conflicts' 'replaces' 'backup' 'options' 'install' \
        'changelog' 'source' 'noextract' 'md5sums' 'build' \
        'check' 'package' 'depends' 'makedepends' 'checkdepends'

}

function assert_pkgbuild {

    if [ -e "$1" ]; then

        source "$1"
        if [ -n "${pkgname[0]}" ]; then
            return 0 # valid PKGBUILD
        fi

    fi

    error "$1 is not a valid PKGBUILD"
    return 1
}

function check_replacement {

    [ $2 ] || return 0  # Free (not found)
    local needle=$1; shift
    local item
    local rep
    for line in $@; do

        item="$(echo "$line" | cut -d':' -f1)"
        rep="$(echo "$line" | cut -s -d':' -f2)"

        if [ "$item" == "$needle" ]; then
            if [ -z "$rep" ]; then
                return 15 # Nonfree (found)
            else
                echo "$rep"
                return 0 # Free (has replacement)
            fi
        fi

    done
    return 0 # Free (not found)
}

function get_blacklist {  # Download the blacklist.

    pushd "$XDG_CONFIG_HOME/libretools" >/dev/null

    msg "Downloading the blacklist of proprietary software packages."

    if ! wget -N -q -O blacklist.txt "${BLACKLIST}" 2>/dev/null; then

        if [ -e "$XDG_CONFIG_HOME/libretools/blacklist.txt" ]; then
            warning "Using local copy of blacklist"
        else
            error "Download failed, exiting"
        fi

    fi

    popd > /dev/null
}

function check_deps {  # Check wheter a package depends on non-free

    unset_pkgbuild

    if ! assert_pkgbuild "$1"; then
        return 1 # not PKGBUILD
    fi

    msg "${pkgbase:-${pkgname[0]}} $pkgver $pkgrel ${epoch:-""}" # > "$logpipe"

    for pkg in ${pkgname[@]} ${depends[@]} ${makedepends[@]} ${checkdepends[@]}; do

        lines=($(grep "$pkg" "$XDG_CONFIG_HOME/libretools/blacklist.txt" | tr " " "_"))

        rep="$(check_replacement $pkg ${lines[@]})"
        freedom=$?

        if [ "$freedom" -eq 15 ]; then
            warning "found $pkg"  # > "$logpipe"
            ev=15
            continue

        elif [ -n "$rep" ]; then

            if [ "$rep" = "$pkg" ]; then
                msg2 "$pkg is repackaged with the same name." # > "$logpipe"
                continue
            else
                msg2 "$pkg -> $rep"  # > "$logpipe"
                continue
            fi

        fi

    done

}

function usage {
    # TODO: implement PKGBUILD arguments
    echo ""
    echo "$(basename $0) [options] [PKGBUILD1 PKGBUILD2 ...]"
    echo ""
    echo "OPTIONS"
    echo ""
    echo " -h : this message"
    echo ""
    echo "If no PKGBUILD is specified, one is searched on current directory"

    exit 1
}

while getopts 'h' arg; do
    case "$arg" in
        h) usage ;;
    esac
done

if (( ! EUID )); then
    error "Run as normal user"
fi

source /etc/libretools.conf
if [ -e "$XDG_CONFIG_HOME/libretools/libretools.conf" ]; then
    source "$XDG_CONFIG_HOME/libretools/libretools.conf"
fi

if [ -z "${BLACKLIST}" ]; then
    error "BLACKLIST variable is not set your libretools.conf file"
    exit 1
fi

if [ ! -d "$XDG_CONFIG_HOME/libretools" ]; then
    mkdir -p "$XDG_CONFIG_HOME/libretools"
fi

startdir=`pwd`

get_blacklist
# log

shift $(( OPTIND - 1))

msg "Looking for unfree dependencies"

if [ $# -gt 1 ]; then

    for p in $@; do
        if [ -n "$p" ]; then
            check_deps "$p"
        fi
    done

else

    check_deps "`pwd`/PKGBUILD"

fi

exit $ev