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.

2 files changed, 13 insertions, 3 deletions

diff --git a/src/utils/boot.py b/src/utils/boot.py
index cd66357..4de20b9 100644
--- a/src/utils/boot.py
+++ b/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)
diff --git a/src/utils/uefi.py b/src/utils/uefi.py
index 753cc0b..67f1354 100644
--- a/src/utils/uefi.py
+++ b/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():