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#!/usr/bin/env python
# Turku backups - client agent
# Copyright 2015 Canonical Ltd.
#
# 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 warranties of MERCHANTABILITY,
# SATISFACTORY QUALITY, 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 __future__ import print_function
import os
import json
import random
import subprocess
import tempfile
import time
from utils import load_config, acquire_lock, api_call
def parse_args():
import argparse
parser = argparse.ArgumentParser(
formatter_class=argparse.ArgumentDefaultsHelpFormatter)
parser.add_argument('--config-dir', '-c', type=str, default='/etc/turku-agent')
parser.add_argument('--wait', '-w', type=float)
parser.add_argument('--restore', action='store_true')
parser.add_argument('--restore-storage', type=str, default=None)
return parser.parse_args()
def call_ssh(config, storage, ssh_req):
# Write the server host public key
t = tempfile.NamedTemporaryFile()
for key in storage['ssh_ping_host_keys']:
t.write('%s %s\n' % (storage['ssh_ping_host'], key))
t.flush()
# Call ssh
ssh_command = config['ssh_command']
ssh_command += [
'-T',
'-o', 'BatchMode=yes',
'-o', 'UserKnownHostsFile=%s' % t.name,
'-o', 'StrictHostKeyChecking=yes',
'-o', 'CheckHostIP=no',
'-i', config['ssh_private_key_file'],
'-R', '%d:%s:%d' % (ssh_req['port'], config['rsyncd_local_address'], config['rsyncd_local_port']),
'-p', str(storage['ssh_ping_port']),
'-l', storage['ssh_ping_user'],
storage['ssh_ping_host'],
'turku-ping-remote',
]
p = subprocess.Popen(ssh_command, stdin=subprocess.PIPE)
# Write the ssh request
p.stdin.write(json.dumps(ssh_req) + '\n.\n')
# Wait for the server to close the SSH connection
try:
p.wait()
except KeyboardInterrupt:
pass
# Cleanup
t.close()
def main(argv):
args = parse_args()
# Sleep a random amount of time if requested
if args.wait:
time.sleep(random.uniform(0, args.wait))
config = load_config(args.config_dir)
# Basic checks
for i in ('ssh_private_key_file', 'machine_uuid', 'machine_secret', 'api_url'):
if i not in config:
return
if not os.path.isfile(config['ssh_private_key_file']):
return
lock = acquire_lock(os.path.join(config['lock_dir'], 'turku-agent-ping.lock'))
restore_mode = args.restore
# Check with the API server
api_out = {}
machine_merge_map = (
('machine_uuid', 'uuid'),
('machine_secret', 'secret'),
)
api_out['machine'] = {}
for a, b in machine_merge_map:
if a in config:
api_out['machine'][b] = config[a]
if restore_mode:
print('Entering restore mode.')
print()
api_reply = api_call(config['api_url'], 'agent_ping_restore', api_out)
sources_by_storage = {}
for source_name in api_reply['machine']['sources']:
source = api_reply['machine']['sources'][source_name]
if source_name not in config['sources']:
continue
if 'storage' not in source:
continue
if source['storage']['name'] not in sources_by_storage:
sources_by_storage[source['storage']['name']] = {}
sources_by_storage[source['storage']['name']][source_name] = source
if len(sources_by_storage) == 0:
print('Cannot find any appropraite sources.')
return
print('This machine\'s sources are on the following storage units:')
for storage_name in sources_by_storage:
print(' %s' % storage_name)
for source_name in sources_by_storage[storage_name]:
print(' %s' % source_name)
print()
if len(sources_by_storage) == 1:
storage = sources_by_storage.values()[0].values()[0]['storage']
elif args.restore_storage:
if args.restore_storage in sources_by_storage:
storage = sources_by_storage[args.restore_storage]['storage']
else:
print('Cannot find appropriate storage "%s"' % args.restore_storage)
return
else:
print('Multiple storages found. Please use --restore-storage to specify one.')
return
ssh_req = {
'verbose': True,
'action': 'restore',
'port': random.randint(49152, 65535),
}
print('Storage unit: %s' % storage['name'])
if 'restore_path' in config:
print('Local destination path: %s' % config['restore_path'])
print('Sample restore usage from storage unit:')
print(
' RSYNC_PASSWORD=%s rsync -avzP --numeric-ids ${P?}/ rsync://%s@127.0.0.1:%s/%s/' % (
config['restore_password'],
config['restore_username'],
ssh_req['port'], config['restore_module']
)
)
print()
call_ssh(config, storage, ssh_req)
else:
api_reply = api_call(config['api_url'], 'agent_ping_checkin', api_out)
if 'scheduled_sources' not in api_reply:
return
sources_by_storage = {}
for source_name in api_reply['machine']['scheduled_sources']:
source = api_reply['machine']['scheduled_sources'][source_name]
if source_name not in config['sources']:
continue
if 'storage' not in source:
continue
if source['storage']['name'] not in sources_by_storage:
sources_by_storage[source['storage']['name']] = {}
sources_by_storage[source['storage']['name']][source_name] = source
for storage_name in sources_by_storage:
ssh_req = {
'verbose': True,
'action': 'checkin',
'port': random.randint(49152, 65535),
'sources': {},
}
for source in sources_by_storage[storage_name]:
ssh_req['sources'][source] = {
'username': config['sources'][source]['username'],
'password': config['sources'][source]['password'],
}
call_ssh(config, sources_by_storage[storage_name].values()[0]['storage'], ssh_req)
# Cleanup
lock.close()
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