1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
|
# This file is part of cloud-init. See LICENSE file for license information.
"""Query standardized instance metadata from the command line."""
import argparse
from errno import EACCES
import os
import sys
from cloudinit.handlers.jinja_template import (
convert_jinja_instance_data, render_jinja_payload)
from cloudinit.cmd.devel import addLogHandlerCLI, read_cfg_paths
from cloudinit import log
from cloudinit.sources import (
INSTANCE_JSON_FILE, INSTANCE_JSON_SENSITIVE_FILE, REDACT_SENSITIVE_VALUE)
from cloudinit import util
NAME = 'query'
LOG = log.getLogger(NAME)
def get_parser(parser=None):
"""Build or extend an arg parser for query utility.
@param parser: Optional existing ArgumentParser instance representing the
query subcommand which will be extended to support the args of
this utility.
@returns: ArgumentParser with proper argument configuration.
"""
if not parser:
parser = argparse.ArgumentParser(
prog=NAME, description='Query cloud-init instance data')
parser.add_argument(
'-d', '--debug', action='store_true', default=False,
help='Add verbose messages during template render')
parser.add_argument(
'-i', '--instance-data', type=str,
help=('Path to instance-data.json file. Default is /run/cloud-init/%s'
% INSTANCE_JSON_FILE))
parser.add_argument(
'-l', '--list-keys', action='store_true', default=False,
help=('List query keys available at the provided instance-data'
' <varname>.'))
parser.add_argument(
'-u', '--user-data', type=str,
help=('Path to user-data file. Default is'
' /var/lib/cloud/instance/user-data.txt'))
parser.add_argument(
'-v', '--vendor-data', type=str,
help=('Path to vendor-data file. Default is'
' /var/lib/cloud/instance/vendor-data.txt'))
parser.add_argument(
'varname', type=str, nargs='?',
help=('A dot-delimited instance data variable to query from'
' instance-data query. For example: v2.local_hostname'))
parser.add_argument(
'-a', '--all', action='store_true', default=False, dest='dump_all',
help='Dump all available instance-data')
parser.add_argument(
'-f', '--format', type=str, dest='format',
help=('Optionally specify a custom output format string. Any'
' instance-data variable can be specified between double-curly'
' braces. For example -f "{{ v2.cloud_name }}"'))
return parser
def handle_args(name, args):
"""Handle calls to 'cloud-init query' as a subcommand."""
paths = None
addLogHandlerCLI(LOG, log.DEBUG if args.debug else log.WARNING)
if not any([args.list_keys, args.varname, args.format, args.dump_all]):
LOG.error(
'Expected one of the options: --all, --format,'
' --list-keys or varname')
get_parser().print_help()
return 1
uid = os.getuid()
if not all([args.instance_data, args.user_data, args.vendor_data]):
paths = read_cfg_paths()
if args.instance_data:
instance_data_fn = args.instance_data
else:
redacted_data_fn = os.path.join(paths.run_dir, INSTANCE_JSON_FILE)
if uid == 0:
sensitive_data_fn = os.path.join(
paths.run_dir, INSTANCE_JSON_SENSITIVE_FILE)
if os.path.exists(sensitive_data_fn):
instance_data_fn = sensitive_data_fn
else:
LOG.warning(
'Missing root-readable %s. Using redacted %s instead.',
sensitive_data_fn, redacted_data_fn)
instance_data_fn = redacted_data_fn
else:
instance_data_fn = redacted_data_fn
if args.user_data:
user_data_fn = args.user_data
else:
user_data_fn = os.path.join(paths.instance_link, 'user-data.txt')
if args.vendor_data:
vendor_data_fn = args.vendor_data
else:
vendor_data_fn = os.path.join(paths.instance_link, 'vendor-data.txt')
try:
instance_json = util.load_file(instance_data_fn)
except (IOError, OSError) as e:
if e.errno == EACCES:
LOG.error("No read permission on '%s'. Try sudo", instance_data_fn)
else:
LOG.error('Missing instance-data file: %s', instance_data_fn)
return 1
instance_data = util.load_json(instance_json)
if uid != 0:
instance_data['userdata'] = (
'<%s> file:%s' % (REDACT_SENSITIVE_VALUE, user_data_fn))
instance_data['vendordata'] = (
'<%s> file:%s' % (REDACT_SENSITIVE_VALUE, vendor_data_fn))
else:
instance_data['userdata'] = util.load_file(user_data_fn)
instance_data['vendordata'] = util.load_file(vendor_data_fn)
if args.format:
payload = '## template: jinja\n{fmt}'.format(fmt=args.format)
rendered_payload = render_jinja_payload(
payload=payload, payload_fn='query commandline',
instance_data=instance_data,
debug=True if args.debug else False)
if rendered_payload:
print(rendered_payload)
return 0
return 1
response = convert_jinja_instance_data(instance_data)
if args.varname:
try:
for var in args.varname.split('.'):
response = response[var]
except KeyError:
LOG.error('Undefined instance-data key %s', args.varname)
return 1
if args.list_keys:
if not isinstance(response, dict):
LOG.error("--list-keys provided but '%s' is not a dict", var)
return 1
response = '\n'.join(sorted(response.keys()))
elif args.list_keys:
response = '\n'.join(sorted(response.keys()))
if not isinstance(response, str):
response = util.json_dumps(response)
print(response)
return 0
def main():
"""Tool to query specific instance-data values."""
parser = get_parser()
sys.exit(handle_args(NAME, parser.parse_args()))
if __name__ == '__main__':
main()
# vi: ts=4 expandtab
|
