curthooks: check for non-availability of EFI variables

Some UEFI firmware does not support EFI variables at runtime. In this case directory /sys/firmware/efi/efivars does not exist. This would lead to an exception when calling efibootmgr. Signed-off-by: Heinrich Schuchardt <[email protected]>
canonical · Jan 26, 2023 · db8f452 · db8f452
1 parent c0354b3
commit db8f452
Showing 1 changed file with 5 additions and 1 deletion.
diff --git a/curtin/commands/curthooks.py b/curtin/commands/curthooks.py
@@ -813,7 +813,11 @@ def setup_grub(cfg, target, osfamily=DISTROS.debian, variant=None):
     else:
         instdevs = ["none"]
 
-    update_nvram = grubcfg.get('update_nvram', True)
+    if util.is_efivars_writable():
+        update_nvram = grubcfg.get('update_nvram', True)
+    else:
+        update_nvram = False
+
     if uefi_bootable and update_nvram:
         efi_orig_output = util.get_efibootmgr(target)
         uefi_remove_old_loaders(grubcfg, target)