From 97ff781ee8ffc7f5298cb287d72d01d7e9cf9bbc Mon Sep 17 00:00:00 2001
From: "Matt A. Tobin" <email@mattatobin.com>
Date: Sun, 11 Feb 2018 09:25:10 -0500
Subject: Add UpdateChannel.jsm

---
 toolkit/modules/UpdateChannel.jsm | 47 +++++++++++++++++++++++++++++++++++++++
 toolkit/modules/moz.build         |  3 +++
 2 files changed, 50 insertions(+)
 create mode 100644 toolkit/modules/UpdateChannel.jsm

diff --git a/toolkit/modules/UpdateChannel.jsm b/toolkit/modules/UpdateChannel.jsm
new file mode 100644
index 000000000..c2bdce8ad
--- /dev/null
+++ b/toolkit/modules/UpdateChannel.jsm
@@ -0,0 +1,47 @@
+#filter substitution
+
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+this.EXPORTED_SYMBOLS = ["UpdateChannel"];
+
+const Cu = Components.utils;
+
+Cu.import("resource://gre/modules/Services.jsm");
+
+this.UpdateChannel = {
+  /**
+   * Read the update channel from defaults only.  We do this to ensure that
+   * the channel is tightly coupled with the application and does not apply
+   * to other instances of the application that may use the same profile.
+   *
+   * @param [optional] aIncludePartners
+   *        Whether or not to include the partner bits. Default: true.
+   */
+  get: function UpdateChannel_get(aIncludePartners = true) {
+    let channel = "@MOZ_UPDATE_CHANNEL@";
+    let defaults = Services.prefs.getDefaultBranch(null);
+    try {
+      channel = defaults.getCharPref("app.update.channel");
+    } catch (e) {
+      // use default value when pref not found
+    }
+
+    if (aIncludePartners) {
+      try {
+        let partners = Services.prefs.getChildList("app.partner.").sort();
+        if (partners.length) {
+          channel += "-cck";
+          partners.forEach(function (prefName) {
+            channel += "-" + Services.prefs.getCharPref(prefName);
+          });
+        }
+      } catch (e) {
+        Cu.reportError(e);
+      }
+    }
+
+    return channel;
+  }
+};
diff --git a/toolkit/modules/moz.build b/toolkit/modules/moz.build
index 271c9b8f7..74c40a55e 100644
--- a/toolkit/modules/moz.build
+++ b/toolkit/modules/moz.build
@@ -104,6 +104,9 @@ EXTRA_JS_MODULES += [
 EXTRA_JS_MODULES.third_party.jsesc += ['third_party/jsesc/jsesc.js']
 EXTRA_JS_MODULES.sessionstore += ['sessionstore/Utils.jsm']
 
+if not CONFIG['MOZ_WEBEXTENSIONS']:
+  EXTRA_JS_PP_MODULES += ['UpdateChannel.jsm']
+
 if CONFIG['MOZ_WIDGET_TOOLKIT'] in ('windows', 'cocoa'):
     DEFINES['CAN_DRAW_IN_TITLEBAR'] = 1
 
-- 
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