Bug 1799503 - Update Firefox via APT (not balrog) in our .deb packages r=bytesized

Differential Revision: https://phabricator.services.mozilla.com/D168324

widget/gtk/WidgetUtilsGtk.cpp

@@ -14,6 +14,13 @@
 #include "nsWindow.h"
 #include "nsIGfxInfo.h"
 #include "mozilla/Components.h"
+#include "nsCOMPtr.h"
+#include "nsIProperties.h"
+#include "nsIFile.h"
+#include "nsXULAppAPI.h"
+#include "nsXPCOMCID.h"
+#include "nsDirectoryServiceDefs.h"
+#include "nsString.h"
 #include "nsGtkKeyUtils.h"
 #include "nsGtkUtils.h"
 
@@ -137,6 +144,31 @@ bool IsRunningUnderFlatpak() {
   return sRunning;
 }
 
+bool IsPackagedAppFileExists() {
+  static bool sRunning = [] {
+    nsresult rv;
+    nsCString path;
+    nsCOMPtr<nsIFile> file;
+    nsCOMPtr<nsIProperties> directoryService;
+
+    directoryService = do_GetService(NS_DIRECTORY_SERVICE_CONTRACTID);
+    NS_ENSURE_TRUE(directoryService, FALSE);
+
+    rv = directoryService->Get(NS_GRE_DIR, NS_GET_IID(nsIFile),
+                               getter_AddRefs(file));
+    NS_ENSURE_SUCCESS(rv, FALSE);
+
+    rv = file->AppendNative("is-packaged-app"_ns);
+    NS_ENSURE_SUCCESS(rv, FALSE);
+
+    rv = file->GetNativePath(path);
+    NS_ENSURE_SUCCESS(rv, FALSE);
+
+    return g_file_test(path.get(), G_FILE_TEST_EXISTS);
+  }();
+  return sRunning;
+}
+
 const char* GetSnapInstanceName() {
   static const char* sInstanceName = []() -> const char* {
     const char* snapName = g_getenv("SNAP_NAME");

widget/gtk/WidgetUtilsGtk.h

@@ -45,6 +45,7 @@ GdkEvent* GetLastMousePressEvent();
 const char* GetSnapInstanceName();
 bool IsRunningUnderSnap();
 bool IsRunningUnderFlatpak();
+bool IsPackagedAppFileExists();
 inline bool IsRunningUnderFlatpakOrSnap() {
   return IsRunningUnderFlatpak() || IsRunningUnderSnap();
 }

xpcom/base/nsSystemInfo.cpp

@@ -1126,7 +1126,8 @@ nsresult nsSystemInfo::Init() {
     return rv;
   }
   rv = SetPropertyAsBool(u"isPackagedApp"_ns,
-                         widget::IsRunningUnderFlatpakOrSnap());
+                         widget::IsRunningUnderFlatpakOrSnap() ||
+                             widget::IsPackagedAppFileExists());
   if (NS_WARN_IF(NS_FAILED(rv))) {
     return rv;
   }