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#!/bin/sh
# Copyright 2022 Helmut Grohne <helmut@subdivi.de>
# SPDX-License-Identifier: MIT
#
# This is a mmdebstrap customize hook that enables systemd-resolved on various
# Debian releases.
set -eu
TARGET=$1
LIBNSS_RESOLVE_VERSION=$(dpkg-query --root "$TARGET" -f '${Version}' -W libnss-resolve 2>/dev/null) || :
link_resolv_conf() {
if ! test -e "$TARGET$1" -o -h "$TARGET/etc/resolv.conf"; then
# To avoid breaking network during mmdebstrap via a dead link, take a copy.
install -D "$TARGET/etc/resolv.conf" "$TARGET$1"
fi
ln -fs "..$1" "$TARGET/etc/resolv.conf"
}
if dpkg --compare-versions "$LIBNSS_RESOLVE_VERSION" lt 251.3-2~exp1; then
if test "${MMDEBSTRAP_MODE:-}" = chrootless; then
systemctl --root "$TARGET" enable systemd-resolved.service
else
chroot "$TARGET" systemctl enable systemd-resolved.service
fi
if test -z "$LIBNSS_RESOLVE_VERSION" || dpkg --compare-versions "$LIBNSS_RESOLVE_VERSION" lt 236; then
link_resolv_conf /run/systemd/resolve/resolv.conf
else
link_resolv_conf /run/systemd/resolve/stub-resolv.conf
fi
else
if test -h "$TARGET/etc/resolv.conf" && ! test -e "$TARGET/etc/resolv.conf"; then
resolvconftarget=$(readlink "$TARGET/etc/resolv.conf")
if test "${resolvconftarget#../run/}" != "$resolvconftarget"; then
# /etc/resolv.conf is a dead link pointing to ../run/*
# mmdebstrap originally copied /etc/resolv.conf
# This situation arises when installing systemd-resolved in bookworm
# Fix network during mmdebstrap.
install -D /etc/resolv.conf "$TARGET${resolvconftarget#..}"
fi
fi
fi
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