#!/bin/bash

function PrimaryXml {
        wget -q -O - $1/repodata/repomd.xml \
                | grep primary.xml \
                | sed -n -e 's/.*"\(.*\)".*/\1/p'
}

function GetPackages {
        BaseUrl="$1"
        Include=`echo $2 | tr ' ' '|'`
        Exclude=`echo $3 | tr ' ' '|'`

        wget -q -O - $BaseUrl`PrimaryXml $BaseUrl` \
                | zcat \
                | sed -n -e 's/.*href="\([^"]*\)\".*/\1/p' \
                | grep -E "rpm$" \
                | ( [ -z "$Include" ] && cat || grep -E "($Include)" ) \
                | ( [ -z "$Exclude" ] && cat || grep -vE "($Exclude)" ) \
}

function DownloadPackages {
        BaseUrl="$1"

        Mode=0
        Include=""
        Exclude=""

        shift
        while (($#)); do
                if [[ "$1" == "-v" ]] ; then
                        Mode=1
                else
                        if [ $Mode -eq 1 ] ; then
                                Exclude="$Exclude $1"
                        else
                                Include="$Include $1"
                        fi
                fi

                shift
        done

        GetPackages $BaseUrl "$Include" "$Exclude" | while read i ; do
                if [ ! -f $i ] ; then
                        test -d `dirname $i` || mkdir -p `dirname $i`

                        echo "Downloading $BaseUrl$i..."
                        wget -q -O $i $BaseUrl$i
                fi
        done

        echo "Download complete."
}


DownloadPackages https://dl.google.com/linux/chrome/rpm/stable/x86_64/ google-chrome-stable