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# Maintainer: Leonardo Arena <rnalrd@alpinelinux.org>
pkgname=dns-root-hints
pkgver=2019073000
pkgrel=2
pkgdesc="The DNS root hint(s)"
url="https://www.internic.net/domain"
arch="noarch"
license="Public-Domain"
depends="curl gnupg"
makedepends="curl"
options="net"
source="verisign-grs-nstld-key.asc named.root named.root.sig
	update-$pkgname
	$pkgname.crond
	"

build() {
	mkdir -p "$builddir"
}

package() {
	cd "$builddir"
	install -D -m 644 -o root -g root "$srcdir"/named.root \
		"$pkgdir"/usr/share/$pkgname/named.root
	install -D -m 644 -o root -g root "$srcdir"/named.root.sig \
		"$pkgdir"/usr/share/$pkgname/named.root.sig
	install -D -m 644 -o root -g root "$srcdir"/verisign-grs-nstld-key.asc \
		"$pkgdir"/usr/share/$pkgname/verisign-grs-nstld-key.asc
	install -D -m 755 -o root -g root "$srcdir"/update-$pkgname \
		"$pkgdir"/usr/bin/update-$pkgname
	install -D -m 755 -o root -g root "$srcdir"/$pkgname.crond \
		"$pkgdir"/etc/periodic/monthly/$pkgname

	# compatibility links
	cd "$pkgdir/usr/share/$pkgname"
	ln -s named.root named.cache
	ln -s named.root db.cache
}

check() {
	cd "$builddir"
	local _awkprog='
		/related version of root zone:/ {
			rootver=$NF;
			if (pkgver != rootver) {
				$1="ERROR:";
				print;
				exit 1;
			};
			printf "OK: %s\n", rootver;
			quit;
		}'
	awk -v pkgver="$pkgver" "$_awkprog" "$srcdir"/named.root
}

# check new versions of root hints and commit
snapshot() {
	# use a temporary dir for new files
	export _tmp=$(mktemp -d -p .)
	for file in named.root named.root.sig; do
		curl -sLR "${url}/${file}" -o "${_tmp}/${file}"
	done

	# compare new and current versions
	local _drh_new_ver=$(grep "related version of root zone:" ${_tmp}/named.root | egrep -o '[0-9]{10}')
	local _drh_current_ver=$(grep "related version of root zone:" named.root | egrep -o '[0-9]{10}')

	# commit if new version is found
	if [ "$_drh_new_ver" != "$_drh_current_ver" ]; then
		_check_sig
		mv ${_tmp}/named.root named.root
		mv ${_tmp}/named.root.sig named.root.sig
		git add named.root named.root.sig
		abump $pkgname-$_drh_new_ver
	fi

	# cleanup
	rm "${_tmp}"/* 2>/dev/null || true
	rmdir "${_tmp}"
}

_check_sig() {
	local GNUPGHOME="$builddir/.gpg"
	install -d -m 0700 "$GNUPGHOME"
	gpg --import < verisign-grs-nstld-key.asc
	gpg --verify "${_tmp}/named.root.sig" "${_tmp}/named.root"
}

sha512sums="3ecf5d66e506526ad98ea0b371202f0763b987322bd4407b40fcd95415202bddb18fd06c82eb397566b393e214dc88cb17ec94f3908328e8a55f5f68cc730993  verisign-grs-nstld-key.asc
0491784a0d0722113120bae4dd42c7671cb05b4b76d4dd4773718ee4c7777d7fb7b039f76b8a30179d5dfa8f3142182bf0b0d809f9d6e1ef581d08482e06d250  named.root
b1d76a8040c534f2a5ffc54b92aa3a465ddd01b345e2a7eade258359017c623d5a847a270b259cd58ba3d8550a3519b0921f9f62dc6e98a0acdd3873b2556359  named.root.sig
7e640e997dd0eae47fb1e609f73d5206e09684eada15d3b6043fc23e639859af743b99cbd868e98269c2af25e7c3eeea307f52f2fb7d4a6f3e00f8b14a289322  update-dns-root-hints
67a7ef07ee9086ce584a8b316b15cd05214968f89bbc363fb2d5932ebf47ed962c0862fe254082e68f27574acb62f3672137dd23c40d7d2047c969ee449827f8  dns-root-hints.crond"