lib32-find_updates

#!/bin/bash
#Finding updates to lib32 packages

#For archlinux system
WORKING_DIRECTORY="/var/lib/pacman/sync"
USE_LOCAL_DATABASE=1;

#For non-archlinux systems
#WORKING_DIRECTORY="/home/user/lib32"
#USE_LOCAL_DATABASE=0;
#MIRROR="http://mir.archlinux.fr"


#extract pkgver from lib32-package-pkgver-pkgrel format
get_pkgver(){
    echo $1 | rev | awk -F"-" '{print $2}' | rev;
}

#extract pkgrel from lib32-package-pkgver-pkgrel format
get_pkgrel(){
    echo $1 | rev | awk -F"-" '{print $1}' | rev;
}

#extract pkgname from lib32-package-pkgver-pkgrel
get_pkgname(){
    source_string=$1;
    substring="-$2-$3";
    echo ${source_string%$substring};
}

#check version between lib32-package and package.
# $_pkgver is the version from core/extra
# $_pkgrel is the version from core/extra
check_all(){
    if [ $_pkgver != $pkgver ];then
	echo "$pkgname $_pkgver new $pkgver is old";
    else
	if [ $_pkgrel != $pkgrel ];then
	    if [[ $_pkgrel == *.*  || $pkgrel == *.* ]] ; then
		continue; #ignore packages that have . in pkgrel
	    else
		echo "$pkgname $_pkgrel is newrel $pkgrel is old";
	    fi
	fi
    fi

}
#find package in core/extra
#return 1 if the package is not found
#return 0 succes
find_package(){
    _pkgname=${1#"lib32-"};
    #testing first core
    if [ $_pkgname = "nas" ]; then
	result=$(ls -1 "$WORKING_DIRECTORY/community" | grep ^$_pkgname -m1);
    else
    	result=$(ls -1 "$WORKING_DIRECTORY/core" | grep ^$_pkgname -m1);
    	if [ -z $result ]; then
	    result=$(ls -1 "$WORKING_DIRECTORY/extra" | grep ^$_pkgname -m1);
	    if [ -z $result ]; then
		return 1; #package not found;
	    fi
    	fi
    fi
    _pkgver=$(get_pkgver $result);
    _pkgrel=$(get_pkgrel $result);
    return 0; #sucess
}

extract_database(){
    #clean working directory
    rm -rf "$WORKING_DIRECTORY"/*
    mkdir "$WORKING_DIRECTORY"/{core,extra,community}
    for repo in core extra community; do
	wget "$MIRROR/$repo/os/x86_64/$repo.db.tar.gz" -q -P "$WORKING_DIRECTORY/$repo"
	tar xzf "$WORKING_DIRECTORY/$repo/$repo.db.tar.gz" -C "$WORKING_DIRECTORY/$repo"
    done
}

if [ ! -d "$WORKING_DIRECTORY" ]; then
    echo "Working directory doesn't exist"
    exit
fi

if [ $USE_LOCAL_DATABASE -eq 0 ];then
    extract_database;
fi

list=$(ls -1 "$WORKING_DIRECTORY/community/" | grep ^lib32-)
#MAIN
for i in $list; do
    pkgver=$(get_pkgver $i);
    pkgrel=$(get_pkgrel $i);
    pkgname=$(get_pkgname $i $pkgver $pkgrel);
    find_package $pkgname;
    return_val=$?
    if [ $return_val -eq 0 ];then
	check_all;
    else
	echo "$pkgname not found!!";
    fi
done