utils: drop ogCopyEfiBootLoader script

Implement a Python equivalent of ogCopyEfiBootLoader as the
function copy_efi_bootloader. This function copies the contents of
the folder of the EFI loader in the ESP into a ogBoot folder at
the root of the partition target of an image creation.
copy_efi_bootloader is a Windows only functionality.

1 files changed, 52 insertions, 0 deletions

diff --git a/src/utils/uefi.py b/src/utils/uefi.py
index 9bc2e09..5561a6a 100644
--- a/src/utils/uefi.py
+++ b/src/utils/uefi.py
@@ -11,6 +11,10 @@ import logging
 import os
 import shlex
 import subprocess
+import shutil
+from src.utils.disk import *
+from src.utils.fs import *
+from src.utils.probe import *
 
 import fdisk
 
@@ -96,3 +100,51 @@ def efibootmgr_create_bootentry(disk, part, loader, label, add_to_bootorder=True
         proc = subprocess.run(shlex.split(efibootmgr_cmd), check=True, text=True)
     except OSError as e:
         raise OSError(f'Unexpected error adding boot entry to nvram. UEFI firmware might be buggy') from e
+
+
+def copy_windows_efi_bootloader(disk, partition):
+    device = get_partition_device(disk, partition)
+    mountpoint = device.replace('dev', 'mnt')
+    if not mount_mkdir(device, mountpoint):
+        raise RuntimeError(f'Cannot probe OS family. Unable to mount {device} at {esp_mountpoint}')
+
+    os_family = get_os_family(mountpoint)
+    is_uefi = is_uefi_supported()
+
+    if not is_uefi or os_family != OSFamily.WINDOWS:
+        return
+
+    bootlabel = f'Part-{disk:02d}-{partition:02d}'
+    esp, esp_disk, esp_part_number = get_efi_partition(disk, enforce_gpt=True)
+    esp_mountpoint = esp.replace('dev', 'mnt')
+    if not mount_mkdir(esp, esp_mountpoint):
+        umount(mountpoint)
+        raise RuntimeError(f'Unable to mount detected EFI System Partition at {esp} into {esp_mountpoint}')
+
+    loader_paths = [f'{esp_mountpoint}/EFI/{bootlabel}/Boot/bootmgfw.efi',
+                    f'{esp_mountpoint}/EFI/Microsoft/Boot/bootmgfw.efi']
+    try:
+        for efi_app in loader_paths:
+            logging.info(f'Searching for {efi_app}')
+            if os.path.exists(efi_app):
+                loader = efi_app
+                logging.info(f'Found bootloader at ESP partition: {loader}')
+                break
+        else:
+            raise RuntimeError(f'Unable to locate Windows EFI bootloader bootmgfw.efi')
+
+        loader_dir = os.path.dirname(loader)
+        destination_dir = f'{mountpoint}/ogBoot'
+        if os.path.exists(destination_dir):
+            try:
+                shutil.rmtree(destination_dir)
+            except Exception as e:
+                raise OSError(f'Failed to delete {destination_dir}: {e}') from e
+        logging.info(f'Copying {loader_dir} into {destination_dir}')
+        try:
+            shutil.copytree(loader_dir, destination_dir)
+        except Exception as e:
+            raise OSError(f'Failed to copy {loader_dir} into {destination_dir}: {e}') from e
+    finally:
+        umount(mountpoint)
+        umount(esp_mountpoint)