From 18b572dc44dd43259f1ba60e159ba5ade69d60ce Mon Sep 17 00:00:00 2001
From: Alex Smith <alex@smith.is>
Date: Tue, 3 Jun 2025 11:26:20 +1200
Subject: [PATCH] Push the build files

---
 Dockerfile    | 20 ++++++++++++++++++++
 entrypoint.sh | 20 ++++++++++++++++++++
 2 files changed, 40 insertions(+)
 create mode 100644 Dockerfile
 create mode 100644 entrypoint.sh

diff --git a/Dockerfile b/Dockerfile
new file mode 100644
index 0000000..4b33a4e
--- /dev/null
+++ b/Dockerfile
@@ -0,0 +1,20 @@
+FROM alpine:3.22.0
+
+RUN apk add --no-cache build-base bash docker-cli git \
+    && git clone -b add-ipv6-support https://github.com/Alphix/mdns-repeater.git \
+    && cd mdns-repeater \
+    && make \
+    && mv mdns-repeater /bin \
+    && chmod a+x /bin/mdns-repeater \
+    && apk del build-base git \
+    && rm -rf /var/cache/apk/* /tmp/*
+
+COPY entrypoint.sh /entrypoint.sh
+RUN chmod a+x entrypoint.sh
+
+ENV USE_MDNS_REPEATER=1 \
+    OPTIONS="" \
+    INTERFACES="eth0" \
+    DOCKER_NETWORKS="net1 net2"
+
+ENTRYPOINT [ "/entrypoint.sh" ]
diff --git a/entrypoint.sh b/entrypoint.sh
new file mode 100644
index 0000000..5dc7505
--- /dev/null
+++ b/entrypoint.sh
@@ -0,0 +1,20 @@
+#!/bin/bash
+
+ifnames=(${INTERFACES})
+
+# determine interface names for all given docker networks
+for dn in ${DOCKER_NETWORKS}; do
+  ifname=$(docker network list | grep "$dn" | awk '{print $1}')
+  if [[ -z $ifname ]]; then
+    echo "unable to find docker interface for $dn" > /dev/stderr
+  fi
+
+  ifnames+=("br-$ifname")
+done
+
+if [[ ${USE_MDNS_REPEATER} -eq 1 ]]; then
+  exec mdns-repeater ${OPTIONS} ${ifnames[@]}
+else
+  # If the local user has disabled the app, then just sleep forever
+  sleep infinity
+fi