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fix(matrix): point the tuwunel container resolver at the bridge dnsmasq

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The hive-matrix nixos-container came up with an EMPTY /etc/resolv.conf
even with networking.nameservers set, so tuwunel hard-failed at boot
(no nameservers found). The nixos-container default useHostResolvConf=true
puts in-container resolvconf in host-tracking mode: it ignores
networking.nameservers and never receives the host resolv.conf across the
shared-netns boundary, so resolvconf regenerates an empty file.

When the hive network module is on, turn off host-tracking (mkForce, to
beat the module default) so resolvconf honours networking.nameservers,
pointing the resolver at the gateway-container dnsmasq at bridgeIp.
Network module off -> inherit the host resolv.conf.
This commit is contained in:
atlas 2026-06-06 12:57:02 +02:00 • committed by mara
commit 812a072e1c
1 changed files with 13 additions and 6 deletions
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19
nix/modules/hive-matrix.nix
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@ -342,18 +342,25 @@ in
# tuwunel hard-fails to boot if `/etc/resolv.conf` has no
# `nameserver` line (`Failed to configure DNS resolver ... no
# nameservers found in config` → exit 1). This declarative
# nixos-container generates its own resolv.conf via resolvconf
# and — unlike agent containers, whose resolv.conf is written by
# hive-c0re's lifecycle — it has no nameserver source, so it
# comes up empty (just `options edns0`). When the hive network
# module is on, point it at the dnsmasq resolver the module runs
# at `bridgeIp`; this container always shares the host netns
# nixos-container had it come up EMPTY (just `options edns0`)
# even with `networking.nameservers` set: the nixos-container
# default `useHostResolvConf = true` puts in-container resolvconf
# in host-tracking mode, which ignores `networking.nameservers`
# and never receives the host's resolv.conf across the
# shared-netns boundary — so resolvconf regenerates an empty file
# and tuwunel dies at boot.
#
# When the hive network module is on, turn off host-tracking so
# resolvconf honours `networking.nameservers`, pointing the
# resolver at the dnsmasq the network module runs at `bridgeIp`.
# This container always shares the host netns
# (`privateNetwork = false`), so it reaches `bridgeIp` whether or
# not `isolateContainers` is set. With the network module off,
# inherit the host's resolv.conf (which carries the host
# resolver). See `docs/network.md`.
networking = lib.mkMerge [
(lib.mkIf networkCfg.enable {
useHostResolvConf = lib.mkForce false;
nameservers = [ networkCfg.bridgeIp ];
})
(lib.mkIf (!networkCfg.enable) {