From 5b345477300a4ab4424a58021d1adca58d23ac33 Mon Sep 17 00:00:00 2001
From: "Dustin C. Hatch" <dustin@hatch.name>
Date: Thu, 1 Aug 2024 09:27:52 -0500
Subject: [PATCH] h-a: Config Zigbee2MQTT w/ env vars

Zigbee2MQTT commits the cardinal sin of storing state in its
configuration file.  This means the file has to be writable and thus
stored in persistent storage rather than in a ConfigMap.  As a
consequence, making changes to the configuration when the application is
not running is rather difficult.  Case in point: when I added the
internal alias for _mqtt.pyrocufflink.blue_ pointing to the in-cluster
service, Zigbee2MQTT became unable to connect to the broker because it
was using the node port instead of the internal port.  Since it could
not connect to the broker, it refused to start, and thus the container
would not stay running long enough to fix the configuration to point
to the correct port.

Fortunately, Zigbee2MQTT also allows configuring settings via
environment variables, which can be managed with a ConfigMap.  Luckily,
the values read from environment variables override those from the
configuration file, so pointing to the correct broker port with the
environment variable was sufficient to allow the application to start.
---
 home-assistant/kustomization.yaml | 4 ++++
 home-assistant/zigbee2mqtt.env    | 1 +
 home-assistant/zigbee2mqtt.yaml   | 4 ++++
 3 files changed, 9 insertions(+)
 create mode 100644 home-assistant/zigbee2mqtt.env

diff --git a/home-assistant/kustomization.yaml b/home-assistant/kustomization.yaml
index 32e81e5..3528244 100644
--- a/home-assistant/kustomization.yaml
+++ b/home-assistant/kustomization.yaml
@@ -41,6 +41,10 @@ configMapGenerator:
   files:
   - mosquitto.conf
 
+- name: zigbee2mqtt
+  envs:
+  - zigbee2mqtt.env
+
 patches:
 - patch: |-
     apiVersion: apps/v1
diff --git a/home-assistant/zigbee2mqtt.env b/home-assistant/zigbee2mqtt.env
new file mode 100644
index 0000000..d5e2d59
--- /dev/null
+++ b/home-assistant/zigbee2mqtt.env
@@ -0,0 +1 @@
+ZIGBEE2MQTT_CONFIG_MQTT_SERVER=mqtts://mqtt.pyrocufflink.blue:8883
diff --git a/home-assistant/zigbee2mqtt.yaml b/home-assistant/zigbee2mqtt.yaml
index be20c00..3b57bc0 100644
--- a/home-assistant/zigbee2mqtt.yaml
+++ b/home-assistant/zigbee2mqtt.yaml
@@ -61,6 +61,10 @@ spec:
       containers:
       - name: zigbee2mqtt
         image: docker.io/koenkk/zigbee2mqtt:1.33.1
+        envFrom:
+        - configMapRef:
+            name: zigbee2mqtt
+            optional: true
         ports:
         - containerPort: 8080
           name: http