[gnome-boxes] installer-media: Add supports_efi() method

[Felipe Borges <felipeborges src gnome org>]

commit a391cb9a4e82b3251be8c62ac5e0b6cc301df204
Author: Fabiano Fidêncio <fidencio redhat com>
Date:   Mon Aug 26 20:11:22 2019 +0300

    installer-media: Add supports_efi() method
    
    supports_efi() method checks whether the OS to be installed supports
    UEFI or not.
    
    The information about the UEFI support comes from osinfo-db.
    
    https://gitlab.gnome.org/GNOME/gnome-boxes/issues/199
    
    Signed-off-by: Fabiano Fidêncio <fidencio redhat com>

 src/installer-media.vala | 14 ++++++++++++++
 1 file changed, 14 insertions(+)
---
diff --git a/src/installer-media.vala b/src/installer-media.vala
index dd66c8a9..db3e2480 100644
--- a/src/installer-media.vala
+++ b/src/installer-media.vala
@@ -55,6 +55,20 @@
         }
     }
 
+    public bool supports_efi {
+        get {
+            if (os == null)
+                return false;
+
+            foreach (var iter in os.get_firmware_list (null) .get_elements ()) {
+                var firmware = iter as Firmware;
+                if (firmware.get_firmware_type () == "efi")
+                    return true;
+            }
+            return false;
+        }
+    }
+
     public bool prefers_q35 {
         get {
             if (os == null)