!#/bin/env sh

PORTDIR="/portage/tree/dir"
OVERLAY="/nginx/overaly/dir"
PATCHES="/nginx/patches/dir/"

die () {
    echo "$1"
    exit "${2:-1}"
}

die "Path not set!"

for e in "${PORTDIR}"/www-servers/nginx/*.ebuild; do
    name=$(basename "$e")
    target="${OVERLAY}/${name}"

    if [ "$e" -nt "$target" ]; then
        prefix=$(qatom "$name" | cut -d' ' -f3-4 | tr ' ' '/')

        while ! [ -d "${PATCHES}/$prefix" ]; do
            prefix=$(dirname "$prefix")
        done

        cp -f "$e" "$target"

        for p in "${PATCHES}/${prefix}"/*.patch; do
            patch "$target" "$p" || die "patch $p -- failed!"
        done
    fi
done