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# Copyright (C) 2016 Canonical Ltd.
#
# Author: Scott Moser <scott.moser@canonical.com>
# Author: Christian Ehrhardt <christian.ehrhardt@canonical.com>
#
# This file is part of cloud-init. See LICENSE file for license information.
"""gpg.py - Collection of gpg key related functions"""
from cloudinit import log as logging
from cloudinit import util
LOG = logging.getLogger(__name__)
def export_armour(key):
"""Export gpg key, armoured key gets returned"""
try:
(armour, _) = util.subp(["gpg", "--export", "--armour", key],
capture=True)
except util.ProcessExecutionError as error:
# debug, since it happens for any key not on the system initially
LOG.debug('Failed to export armoured key "%s": %s', key, error)
armour = None
return armour
def recv_key(key, keyserver):
"""Receive gpg key from the specified keyserver"""
LOG.debug('Receive gpg key "%s"', key)
try:
util.subp(["gpg", "--keyserver", keyserver, "--recv", key],
capture=True)
except util.ProcessExecutionError as error:
raise ValueError(('Failed to import key "%s" '
'from server "%s" - error %s') %
(key, keyserver, error))
def delete_key(key):
"""Delete the specified key from the local gpg ring"""
try:
util.subp(["gpg", "--batch", "--yes", "--delete-keys", key],
capture=True)
except util.ProcessExecutionError as error:
LOG.warning('Failed delete key "%s": %s', key, error)
def getkeybyid(keyid, keyserver='keyserver.ubuntu.com'):
"""get gpg keyid from keyserver"""
armour = export_armour(keyid)
if not armour:
try:
recv_key(keyid, keyserver=keyserver)
armour = export_armour(keyid)
except ValueError:
LOG.exception('Failed to obtain gpg key %s', keyid)
raise
finally:
# delete just imported key to leave environment as it was before
delete_key(keyid)
return armour
# vi: ts=4 expandtab
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