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
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
|
# Copyright 2014 Microsoft Corporation
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
# Requires Python 2.4+ and Openssl 1.0+
#
import os
import re
import sys
import threading
import azurelinuxagent.common.logger as logger
from azurelinuxagent.common.future import ustr
import azurelinuxagent.common.conf as conf
from azurelinuxagent.common.event import add_event, WALAEventOperation
import azurelinuxagent.common.utils.fileutil as fileutil
import azurelinuxagent.common.utils.shellutil as shellutil
from azurelinuxagent.common.exception import ResourceDiskError
from azurelinuxagent.common.osutil import get_osutil
DATALOSS_WARNING_FILE_NAME="DATALOSS_WARNING_README.txt"
DATA_LOSS_WARNING="""\
WARNING: THIS IS A TEMPORARY DISK.
Any data stored on this drive is SUBJECT TO LOSS and THERE IS NO WAY TO RECOVER IT.
Please do not use this disk for storing any personal or application data.
For additional details to please refer to the MSDN documentation at : http://msdn.microsoft.com/en-us/library/windowsazure/jj672979.aspx
"""
class ResourceDiskHandler(object):
def __init__(self):
self.osutil = get_osutil()
def start_activate_resource_disk(self):
disk_thread = threading.Thread(target = self.run)
disk_thread.start()
def run(self):
mount_point = None
if conf.get_resourcedisk_format():
mount_point = self.activate_resource_disk()
if mount_point is not None and \
conf.get_resourcedisk_enable_swap():
self.enable_swap(mount_point)
def activate_resource_disk(self):
logger.info("Activate resource disk")
try:
mount_point = conf.get_resourcedisk_mountpoint()
fs = conf.get_resourcedisk_filesystem()
mount_point = self.mount_resource_disk(mount_point, fs)
warning_file = os.path.join(mount_point, DATALOSS_WARNING_FILE_NAME)
try:
fileutil.write_file(warning_file, DATA_LOSS_WARNING)
except IOError as e:
logger.warn("Failed to write data loss warnning:{0}", e)
return mount_point
except ResourceDiskError as e:
logger.error("Failed to mount resource disk {0}", e)
add_event(name="WALA", is_success=False, message=ustr(e),
op=WALAEventOperation.ActivateResourceDisk)
def enable_swap(self, mount_point):
logger.info("Enable swap")
try:
size_mb = conf.get_resourcedisk_swap_size_mb()
self.create_swap_space(mount_point, size_mb)
except ResourceDiskError as e:
logger.error("Failed to enable swap {0}", e)
def mount_resource_disk(self, mount_point, fs):
device = self.osutil.device_for_ide_port(1)
if device is None:
raise ResourceDiskError("unable to detect disk topology")
device = "/dev/" + device
mountlist = shellutil.run_get_output("mount")[1]
existing = self.osutil.get_mount_point(mountlist, device)
if(existing):
logger.info("Resource disk {0}1 is already mounted", device)
return existing
fileutil.mkdir(mount_point, mode=0o755)
logger.info("Detect GPT...")
partition = device + "1"
ret = shellutil.run_get_output("parted {0} print".format(device))
if ret[0]:
raise ResourceDiskError("({0}) {1}".format(device, ret[1]))
if "gpt" in ret[1]:
logger.info("GPT detected")
logger.info("Get GPT partitions")
parts = [x for x in ret[1].split("\n") if re.match("^\s*[0-9]+", x)]
logger.info("Found more than {0} GPT partitions.", len(parts))
if len(parts) > 1:
logger.info("Remove old GPT partitions")
for i in range(1, len(parts) + 1):
logger.info("Remove partition: {0}", i)
shellutil.run("parted {0} rm {1}".format(device, i))
logger.info("Create a new GPT partition using entire disk space")
shellutil.run("parted {0} mkpart primary 0% 100%".format(device))
logger.info("Format partition: {0} with fstype {1}",partition,fs)
shellutil.run("mkfs." + fs + " " + partition + " -F")
else:
logger.info("GPT not detected")
logger.info("Check fstype")
ret = shellutil.run_get_output("sfdisk -q -c {0} 1".format(device))
if ret[1].rstrip() == "7" and fs != "ntfs":
logger.info("The partition is formatted with ntfs")
logger.info("Format partition: {0} with fstype {1}",partition,fs)
shellutil.run("sfdisk -c {0} 1 83".format(device))
shellutil.run("mkfs." + fs + " " + partition + " -F")
logger.info("Mount resource disk")
ret = shellutil.run("mount {0} {1}".format(partition, mount_point),
chk_err=False)
if ret:
logger.warn("Failed to mount resource disk. Retry mounting")
shellutil.run("mkfs." + fs + " " + partition + " -F")
ret = shellutil.run("mount {0} {1}".format(partition, mount_point))
if ret:
raise ResourceDiskError("({0}) {1}".format(partition, ret))
logger.info("Resource disk ({0}) is mounted at {1} with fstype {2}",
device, mount_point, fs)
return mount_point
def create_swap_space(self, mount_point, size_mb):
size_kb = size_mb * 1024
size = size_kb * 1024
swapfile = os.path.join(mount_point, 'swapfile')
swaplist = shellutil.run_get_output("swapon -s")[1]
if swapfile in swaplist and os.path.getsize(swapfile) == size:
logger.info("Swap already enabled")
return
if os.path.isfile(swapfile) and os.path.getsize(swapfile) != size:
logger.info("Remove old swap file")
shellutil.run("swapoff -a", chk_err=False)
os.remove(swapfile)
if not os.path.isfile(swapfile):
logger.info("Create swap file")
self.mkfile(swapfile, size_kb * 1024)
shellutil.run("mkswap {0}".format(swapfile))
if shellutil.run("swapon {0}".format(swapfile)):
raise ResourceDiskError("{0}".format(swapfile))
logger.info("Enabled {0}KB of swap at {1}".format(size_kb, swapfile))
def mkfile(self, filename, nbytes):
"""
Create a non-sparse file of that size. Deletes and replaces existing file.
To allow efficient execution, fallocate will be tried first. This includes
``os.posix_fallocate`` on Python 3.3+ (unix) and the ``fallocate`` command
in the popular ``util-linux{,-ng}`` package.
A dd fallback will be tried too. When size < 64M, perform single-pass dd.
Otherwise do two-pass dd.
"""
if not isinstance(nbytes, int):
nbytes = int(nbytes)
if nbytes < 0:
raise ValueError(nbytes)
if os.path.isfile(filename):
os.remove(filename)
# os.posix_fallocate
if sys.version_info >= (3, 3):
# Probable errors:
# - OSError: Seen on Cygwin, libc notimpl?
# - AttributeError: What if someone runs this under...
with open(filename, 'w') as f:
try:
os.posix_fallocate(f.fileno(), 0, nbytes)
return 0
except:
# Not confident with this thing, just keep trying...
pass
# fallocate command
fn_sh = shellutil.quote((filename,))
ret = shellutil.run(u"fallocate -l {0} {1}".format(nbytes, fn_sh))
if ret != 127: # 127 = command not found
return ret
# dd fallback
dd_maxbs = 64 * 1024 ** 2
dd_cmd = "dd if=/dev/zero bs={0} count={1} conv=notrunc of={2}"
blocks = int(nbytes / dd_maxbs)
if blocks > 0:
ret = shellutil.run(dd_cmd.format(dd_maxbs, fn_sh, blocks)) << 8
remains = int(nbytes % dd_maxbs)
if remains > 0:
ret += shellutil.run(dd_cmd.format(remains, fn_sh, 1))
return ret
|
