use python for variable substitution

k8s/matrix/bridge-meta.yaml

@@ -45,6 +45,20 @@ spec:
       labels:
         app: bridge-facebook
     spec:
+      initContainers:
+        - name: template-config
+          image: docker.io/library/python
+          command: ["python", "/init/initialize-bridge.py"]
+          volumeMounts:
+            - name: init
+              mountPath: /init
+            - name: storage
+              mountPath: /data
+            - name: config
+              mountPath: /config
+          envFrom:
+            - secretRef:
+                name: bridge-facebook
       containers:
       - image: dock.mau.dev/mautrix/meta:latest
         name: bridge-facebook
@@ -58,11 +72,6 @@ spec:
             mountPath: /data
           - name: config
             mountPath: /config
-          - name: init
-            mountPath: /init
-        envFrom:
-          - secretRef:
-              name: bridge-facebook
       volumes:
         - name: config
           configMap:

k8s/matrix/bridge-telegram.yaml

@@ -63,6 +63,20 @@ spec:
       labels:
         app: bridge-telegram
     spec:
+      initContainers:
+        - name: template-config
+          image: docker.io/library/python
+          command: ["python", "/init/initialize-bridge.py"]
+          volumeMounts:
+            - name: init
+              mountPath: /init
+            - name: storage
+              mountPath: /data
+            - name: config
+              mountPath: /config
+          envFrom:
+            - secretRef:
+                name: bridge-telegram
       containers:
       - image: dock.mau.dev/mautrix/telegram:latest
         name: bridge-telegram
@@ -76,11 +90,6 @@ spec:
             mountPath: /data
           - name: config
             mountPath: /config
-          - name: init
-            mountPath: /init
-        envFrom:
-          - secretRef:
-              name: bridge-telegram
       volumes:
         - name: config
           configMap:

k8s/matrix/bridge.yaml

@@ -4,11 +4,18 @@ metadata:
   name: bridge-init
   namespace: matrix
 data:
-  initialize-bridge.sh: |
-    #!/bin/bash
-    set -euo pipefail
-    cp /config/config.yaml /data/config.yaml
-    sed -i "s#AS_TOKEN#${AS_TOKEN}#g" /data/config.yaml
-    sed -i "s#HS_TOKEN#${HS_TOKEN}#g" /data/config.yaml
-    sed -i "s#TG_API_ID#${TG_API_ID}#g" /data/config.yaml
-    sed -i "s#TG_API_HASH#${TG_API_HASH}#g" /data/config.yaml
+  initialize-bridge.py: |
+    #!/usr/bin/python
+    import os
+
+    with open("/config/config.yaml") as r:
+      c = r.read()
+
+    for i in ["AS_TOKEN", "HS_TOKEN", "TG_API_ID", "TG_API_HASH"]:
+      value = os.getenv(i)
+      if value is not None:
+        c = c.replace(i, value)
+        print("replaced", i)
+
+    with open("/data/config.yaml", 'w') as w:
+      w.write(c)