Bug 1602840 add build switch for sideloading addons r=zombie

Differential Revision: https://phabricator.services.mozilla.com/D57660

--HG--
extra : moz-landing-system : lando

toolkit/modules/AppConstants.jsm

@@ -278,6 +278,20 @@ this.AppConstants = Object.freeze({
     return result;
   },
 
+  MOZ_ALLOW_ADDON_SIDELOAD:
+#ifdef MOZ_ALLOW_ADDON_SIDELOAD
+  true,
+#else
+  false,
+#endif
+
+  MOZ_ALLOW_LEGACY_EXTENSIONS:
+#ifdef MOZ_ALLOW_LEGACY_EXTENSIONS
+  true,
+#else
+  false,
+#endif
+
   MENUBAR_CAN_AUTOHIDE:
 #ifdef MENUBAR_CAN_AUTOHIDE
   true,

toolkit/modules/moz.build

@@ -287,7 +287,8 @@ for var in ('ANDROID_PACKAGE_NAME',
             'OMNIJAR_NAME'):
             DEFINES[var] = CONFIG[var]
 
-for var in ('MOZ_SYSTEM_NSS',
+for var in ('MOZ_ALLOW_ADDON_SIDELOAD',
+            'MOZ_SYSTEM_NSS',
             'MOZ_UNSIGNED_APP_SCOPE',
             'MOZ_UNSIGNED_SYSTEM_SCOPE',
             'MOZ_UPDATER'):

toolkit/moz.configure

@@ -1233,6 +1233,25 @@ def unsigned_addon_scopes(scopes):
 set_config('MOZ_UNSIGNED_APP_SCOPE', unsigned_addon_scopes.app)
 set_config('MOZ_UNSIGNED_SYSTEM_SCOPE', unsigned_addon_scopes.system)
 
+# Addon sideloading
+# ==============================================================
+
+@depends(update_channel)
+def addon_sideload_allowed_default(update_channel):
+    if update_channel == 'esr':
+        return True
+
+option('--allow-addon-sideload', default=addon_sideload_allowed_default,
+       help='Addon sideloading is allowed')
+
+@depends('--allow-addon-sideload')
+def addon_sideload_allowed(value):
+    allowed = bool(value)
+    if allowed:
+        return True
+
+set_config('MOZ_ALLOW_ADDON_SIDELOAD', addon_sideload_allowed)
+
 # Launcher process (Windows only)
 # ==============================================================