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"""gpg.py - Collection of gpg key related functions"""
# vi: ts=4 expandtab
#
# Copyright (C) 2016 Canonical Ltd.
#
# Author: Scott Moser <scott.moser@canonical.com>
# Author: Juerg Haefliger <juerg.haefliger@hp.com>
# Author: Joshua Harlow <harlowja@yahoo-inc.com>
# Author: Christian Ehrhardt <christian.ehrhardt@canonical.com>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 3, as
# published by the Free Software Foundation.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
from cloudinit import util
from cloudinit import log as logging
LOG = logging.getLogger(__name__)
def gpg_export_armour(key):
"""Export gpg key, armoured key gets returned"""
(armour, _) = util.subp(["gpg", "--export", "--armour", key], capture=True)
return armour
def gpg_recv_key(key, keyserver):
"""Receive gpg key from the specified keyserver"""
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 gpg_delete_key(key):
"""Delete the specified key from the local gpg ring"""
util.subp(["gpg", "--batch", "--yes", "--delete-keys", key], capture=True)
def gpg_getkeybyid(keyid, keyserver):
"""get gpg keyid from keyserver"""
armour = gpg_export_armour(keyid)
if not armour:
try:
gpg_recv_key(keyid, keyserver=keyserver)
except ValueError:
LOG.exception('Failed to obtain gpg key %s', keyid)
raise
armour = gpg_export_armour(keyid)
# delete just imported key to leave environment as it was before
gpg_delete_key(keyid)
return armour.rstrip('\n')
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