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import logging
import os
import shutil
from uaclient import exceptions
def export_gpg_key(source_keyfile: str, destination_keyfile: str) -> None:
"""Copy a specific key from source_keyring_dir into destination_keyfile
:param source_keyfile: Path of source keyring file to export.
:param destination_keyfile: The filename created with the single exported
key.
:raise UserFacingError: Any GPG errors or if specific key does not exist in
the source_keyring_file.
"""
logging.debug("Exporting GPG key %s", source_keyfile)
if not os.path.exists(source_keyfile):
raise exceptions.UserFacingError(
"GPG key '{}' not found.".format(source_keyfile)
)
shutil.copy(source_keyfile, destination_keyfile)
os.chmod(destination_keyfile, 0o644)