Use a manifest template to have different update URL for each xpi

Makefile

@@ -1,13 +1,20 @@
 ARCHS=linux linux64 mac64 win32
-MANIFEST=extension/manifest.json
 
-VERSION=`grep -Eo '"version"\:\s*"[^"]+' $(MANIFEST) | grep -Eo '[0-9].*'`
+ROOT_PATH=/pub/labs/fxos-simulator/adb-helper/
+ROOT_UPDATE_URL=https://ftp.mozilla.org$(ROOT_PATH)
+
+VERSION=1.0
 
 define build-xpis
 	cd extension; \
 	for arch in $(ARCHS); do \
 		echo "build dist/$$arch-$(VERSION).xpi"; \
+		sed \
+			-e 's#@@UPDATE_URL@@#$(ROOT_UPDATE_URL)$$arch/updates.json#' \
+			-e 's#@@VERSION@@#$(VERSION)#' \
+			template-manifest.json > manifest.json; \
 		zip ../dist/$$arch-$(VERSION).xpi -r $$arch adb.json manifest.json; \
+		rm manifest.json; \
 	done
 endef
 

extension/template-manifest.json

@@ -2,13 +2,13 @@
   "manifest_version": 2,
   "name": "ADB binary provider",
   "author": "Mozilla & Android Open Source Project",
-  "version": "1.0",
+  "version": "@@VERSION@@",
   "description": "An extension providing adb blobs for connecting to Firefox for Android",
   "applications": {
     "gecko": {
       "id": "adb@mozilla.org",
       "strict_min_version": "63.0a1",
-      "update_url": "https://ftp.mozilla.org/pub/labs/fxos-simulator/adb-helper/updates.json"
+      "update_url": "@@UPDATE_URL@@"
     }
   },
   "permissions": [