[geary/mjog/data-location-migration: 27/29] Application.Client: Support determining if running under flatpak

[Michael Gratton <mjog src gnome org>]

commit 072156096d61889cc61445738e5122ad451bad61
Author: Michael Gratton <mike vee net>
Date:   Wed Oct 14 00:53:04 2020 +1100

    Application.Client: Support determining if running under flatpak

 src/client/application/application-client.vala | 9 +++++++++
 1 file changed, 9 insertions(+)
---
diff --git a/src/client/application/application-client.vala b/src/client/application/application-client.vala
index a61a68554..7e8d9fbdc 100644
--- a/src/client/application/application-client.vala
+++ b/src/client/application/application-client.vala
@@ -212,6 +212,14 @@ public class Application.Client : Gtk.Application {
         }
     }
 
+    /**
+     * Determines if Geary appears to be running under Flatpak.
+     *
+     * If this returns `true`, then the application instance
+     * appears to be running inside a Flatpak sandbox.
+     */
+    public bool is_flatpak_sandboxed { get; private set; }
+
     /**
      * The global controller for this application instance.
      *
@@ -317,6 +325,7 @@ public class Application.Client : Gtk.Application {
         );
         this.add_main_option_entries(OPTION_ENTRIES);
         this.window_removed.connect_after(on_window_removed);
+        this.is_flatpak_sandboxed = GLib.FileUtils.test("/.flatpak-info", EXISTS);
     }
 
     public override bool local_command_line(ref unowned string[] args,