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
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
|
# This file is part of cloud-init. See LICENSE file for license information.
"""Query standardized instance metadata provided to machine, returning a JSON
structure.
Some instance-data values may be binary on some platforms, such as userdata and
vendordata. Attempt to decompress and decode UTF-8 any binary values.
Any binary values in the instance metadata will be base64-encoded and prefixed
with "ci-b64:" in the output. userdata and, where applicable, vendordata may
be provided to the machine gzip-compressed (and therefore as binary data).
query will attempt to decompress these to a string before emitting the JSON
output; if this fails, they are treated as binary.
"""
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=__doc__)
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 specific variable to query from'
' instance-data. For example: v1.local_hostname. If the'
' value is not JSON serializable, it will be base64-encoded and'
' will contain the prefix "ci-b64:". '))
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 load_userdata(ud_file_path):
"""Attempt to return a string of user-data from ud_file_path
Attempt to decode or decompress if needed.
If unable to decode the content, raw bytes will be returned.
@returns: String of uncompressed userdata if possible, otherwise bytes.
"""
bdata = util.load_file(ud_file_path, decode=False)
try:
return bdata.decode('utf-8')
except UnicodeDecodeError:
return util.decomp_gzip(bdata, quiet=False, decode=True)
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'] = load_userdata(user_data_fn)
instance_data['vendordata'] = load_userdata(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
|
