#!/bin/bash

reposdir=/srv/ftp/
targetdir=$reposdir
repos="core extra testing community"
DB_COMPRESSION="gz"

. $(dirname $0)/../config

if [ -f /etc/makepkg.conf ]; then
    . /etc/makepkg.conf
else
    echo "Error: /etc/makepkg.conf does not exist."
    exit 1
fi

if [ -f "/tmp/createFileList.lock" ]; then
    echo "Error: createFileList allready in progress."
    exit 1
fi

touch "/tmp/createFileList.lock" || exit 1
TMPDIR=$(mktemp -d /tmp/createFileList.XXXXXX) || exit 1
CACHEDIR=$(mktemp -d /tmp/createFileList.XXXXXX) || exit 1

#adjust the nice level to run at a lower priority
/usr/bin/renice +10 -p $$ > /dev/null

getpkgname() {
    local tmp

    tmp=${1##*/}
    tmp=${tmp%$PKGEXT}
    tmp=${tmp%-i686}
    tmp=${tmp%-x86_64}
    tmp=${tmp%-any}
    echo $tmp
}

case "${DB_COMPRESSION}" in
	gz)  TAR_OPT="z" ;;
	bz2) TAR_OPT="j" ;;
	xz)  TAR_OPT="J" ;;
	*) echo "${DB_COMPRESSION} is not a valid archive compression" && exit 1 ;;
esac

cd $reposdir
for repo in $repos; do
    REPO_DB_FILE=${repo}.files.tar.${DB_COMPRESSION}
    for arch in ${ARCHES[@]}; do
        repodir=${repo}/os/${arch}/
        cached="no"

        # extract old file archive
        if [ -f ${targetdir}${repodir}${REPO_DB_FILE} ]; then
            mkdir -p ${CACHEDIR}/${repodir}
            bsdtar -xf ${targetdir}${repodir}${REPO_DB_FILE} -C ${CACHEDIR}/${repodir}
            cached="yes"
        fi

        # create file lists
        for pkg in $repodir*${PKGEXT}; do
            basename=$(basename $pkg)
            pkgname=$(getpkgname $basename)
            tmppkgdir=${TMPDIR}/${repodir}${pkgname}/
            mkdir -p $tmppkgdir
            if [ -f "${CACHEDIR}/${repodir}${pkgname}/files" ]; then
#               echo "cache: $pkgname"
                mv ${CACHEDIR}/${repodir}${pkgname}/files ${tmppkgdir}files
            else
#               echo "$repo/$arch: $pkgname"
                echo '%FILES%' > ${tmppkgdir}files
                bsdtar --exclude=.* -tf $pkg >> ${tmppkgdir}files
                cached="no"
            fi
        done

        # create new file archive
        if [ "$cached" == "no" ]; then
            # at least one package has changed, so let's rebuild the archive
#           echo "creating ${REPO_DB_FILE}/${arch}"
            pkgdir=${targetdir}${repodir}
            mkdir -p $pkgdir
            cd ${TMPDIR}/${repodir}
            [ -f "${pkgdir}${REPO_DB_FILE}.old" ] && rm "${pkgdir}${REPO_DB_FILE}.old"
            [ -f "${pkgdir}${REPO_DB_FILE}" ] && mv "${pkgdir}${REPO_DB_FILE}" "${pkgdir}${REPO_DB_FILE}.old"
            bsdtar --exclude=*.tar.${DB_COMPRESSION} -c${TAR_OPT}f ${pkgdir}${REPO_DB_FILE} *
        fi

        cd $reposdir
    done
done

cd - >/dev/null
rm -rf $TMPDIR || exit 1
rm -rf $CACHEDIR || exit 1
rm -f "/tmp/createFileList.lock" || exit 1
# echo 'done'