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
|
# vi: ts=4 expandtab
#
# Copyright (C) 2012 Canonical Ltd.
# Copyright (C) 2012 Hewlett-Packard Development Company, L.P.
# Copyright (C) 2012 Yahoo! Inc.
#
# Author: Scott Moser <scott.moser@canonical.com>
# Author: Juerg Haefliger <juerg.haefliger@hp.com>
# Author: Joshua Harlow <harlowja@yahoo-inc.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/>.
import contextlib
from cloudinit import util
class MountFailedError(Exception):
pass
@contextlib.contextmanager
def unmounter(umount):
try:
yield umount
finally:
if umount:
sh.subp(["umount", '-l', umount])
def mount_callback_umount(device, callback, data=None):
"""
mount the device, call method 'callback' passing the directory
in which it was mounted, then unmount. Return whatever 'callback'
returned. If data != None, also pass data to callback.
"""
# go through mounts to see if it was already mounted
mounts = sh.load_file("/proc/mounts").splitlines()
mounted = {}
for mpline in mounts:
(dev, mp, fstype, _opts, _freq, _passno) = mpline.split()
mp = mp.replace("\\040", " ")
mounted[dev] = (dev, fstype, mp, False)
with util.tempdir() as tmpd:
umount = False
if device in mounted:
mountpoint = "%s/" % mounted[device][2]
else:
try:
mountcmd = ["mount", "-o", "ro", device, tmpd]
util.subp(mountcmd)
umount = tmpd
except IOError as exc:
raise MountFailedError("%s" % (exc))
mountpoint = "%s/" % tmpd
with unmounter(umount):
if data is None:
ret = callback(mountpoint)
else:
ret = callback(mountpoint, data)
return ret
|
