From 68fd14c7a27de9d962d8783d4c771a39188d0a55 Mon Sep 17 00:00:00 2001
From: Sam Mesterton-Gibbons <sam@samn.co.uk>
Date: Mon, 11 May 2020 10:01:15 +0100
Subject: [PATCH] Start dnsmasq as a system service

Adds a service startup file for dnsmasq to run when the container
starts.
Also adds an environment variable to allow DHCP range to be overridden.
---
 Dockerfile                 | 5 +++++
 etc/services.d/dnsmasq/run | 3 +++
 2 files changed, 8 insertions(+)
 create mode 100755 etc/services.d/dnsmasq/run

diff --git a/Dockerfile b/Dockerfile
index 4ed5aa0..bdc70ec 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -5,3 +5,8 @@ RUN apk add --update dnsmasq
 
 # Copy config files for dnsmasq, and running as a service
 COPY etc /etc/
+
+# Set the start of the IP range to reply to PXE DHCP requests on
+ENV DHCP_RANGE_START=192.168.0.1
+
+# dnsmasq will be started as a system service by the s6 supervisor
diff --git a/etc/services.d/dnsmasq/run b/etc/services.d/dnsmasq/run
new file mode 100755
index 0000000..b44586b
--- /dev/null
+++ b/etc/services.d/dnsmasq/run
@@ -0,0 +1,3 @@
+#!/usr/bin/with-contenv bash
+
+dnsmasq --no-daemon --dhcp-range=${DHCP_RANGE_START},proxy ${DNSMASQ_ARGS}