add --restore-root option to specify target for misc vm files

Provide a flag to specify where misc files (NVRAM vars, loader, etc) restored from the backup should be placed.

libvirtnbdbackup/common.py

@@ -209,6 +209,9 @@ def copy(args: Namespace, source: str, target: str) -> None:
         if args.sshClient:
             args.sshClient.copy(source, target)
         else:
+            if args.restore_root is not None:
+                dir, _ = os.path.split(target)
+                os.makedirs(dir, exist_ok=True)
             shutil.copyfile(source, target)
     except OSError as e:
         log.warning("Failed to copy [%s] to [%s]: [%s]", source, target, e)

libvirtnbdbackup/restore/files.py

@@ -38,6 +38,9 @@ def restore(args: Namespace, vmConfig: str, virtClient: virt.client) -> None:
 
     for setting, val in info.items():
         f = lib.getLatest(args.input, f"*{os.path.basename(val)}*", -1)
+        if args.restore_root is not None:
+            _, _, val_as_relative = os.path.splitroot(val)
+            val = os.path.join(args.restore_root, val_as_relative)
         if lib.exists(args, val):
             logging.info(
                 "File [%s]: for boot option [%s] already exists, skipping.",

virtnbdrestore

@@ -175,6 +175,13 @@ def main() -> None:
         action="store_true",
         help="Preallocate restored qcow images. (default: %(default)s)",
     )
+    opt.add_argument(
+        "-R",
+        "--restore-root",
+        default=None,
+        type=str,
+        help="Store restored misc VM files (loader, firmware vars, etc) under alternative root directory (default /)",
+    )
 
     remopt = parser.add_argument_group("Remote Restore options")
     argopt.addRemoteArgs(remopt)