utils: improve uefi detection mechanism

Checking the existence /sys/firmware/efi as it might appear
sometimes in BIOS installs if the BIOS configuration is not
proper. Checking for the EFI partition is the safest method
to veryfy the install type.

src/live/ogOperations.py

@@ -262,7 +262,7 @@ class OgLiveOperations:
         disk = request.getDisk()
         partition = request.getPartition()
 
-        if is_uefi_supported():
+        if is_uefi_supported(disk):
             logging.info('UEFI support detected')
             logging.info(f'Booting disk={disk} partition={partition}')
             boot_os_at(int(disk), int(partition))

src/utils/boot.py

@@ -69,7 +69,7 @@ def _boot_uefi_linux(disk, part, mountpoint):
         umount(esp_mountpoint)
 
 def boot_os_at(disk, part):
-    if not is_uefi_supported():
+    if not is_uefi_supported(disk):
         raise NotImplementedError('BIOS booting is not implemented yet')
 
     device = get_partition_device(disk, part)

src/utils/uefi.py

@@ -11,6 +11,7 @@ import logging
 import os
 import shlex
 import subprocess
+from src.utils.disk import get_efi_partition
 
 import fdisk
 
@@ -46,8 +47,17 @@ def _check_efibootmgr_json():
     return supported
 
 
-def is_uefi_supported():
-    return True if os.path.exists("/sys/firmware/efi") else False
+def is_uefi_supported(disknum):
+    is_supported = os.path.exists("/sys/firmware/efi")
+
+    if is_supported:
+        try:
+            get_efi_partition(disknum)
+        except Exception as e:
+            logging.info(e)
+            is_supported = False
+
+    return is_supported
 
 
 def run_efibootmgr_json():