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
| | #! /usr/bin/python3
# SPDX-License-Identifier: GPL-2.0-or-later
#
# tasst - Test A Simple Socket Transport
# library of test helpers for passt & pasta
#
# tasst/nstool.py - Run commands in namespaces via 'nstool'
#
# Copyright Red Hat
# Author: David Gibson <david@gibson.dropbear.id.au>
import contextlib
import os
import sys
import tempfile
import avocado
from avocado.utils.process import CmdError
from tasst import Tasst
from tasst.site import IsolatedSiteTasst, SiteTasst, Site, REAL_HOST
from tasst.typing import typecheck
# FIXME: Can this be made more portable?
UNIX_PATH_MAX = 108
class NsToolSite(Site):
NST_BIN = './test/nstool'
def __init__(self, name, sockpath):
if len(sockpath) > UNIX_PATH_MAX:
raise ValueError('Unix domain socket path \"{}\" is too long'.format(sockpath))
super().__init__(name)
self.sockpath = sockpath
def __enter__(self):
self._pid = int(REAL_HOST.output('{} info -wp {}'.format(self.NST_BIN, self.sockpath), timeout=1))
return self
def __exit__(self, *exc_details):
pass
# PID of the nstool hold process as seen by the test host
def pid(self):
return self._pid
# PID of the nstool hold process as seen by another site
# (important when using PID namespaces)
def relative_pid(self, relative_to):
cmd = '{} info -p {}'.format(self.NST_BIN, self.sockpath)
return int(relative_to.output(cmd))
def _nst_cmd(self, cmd, sudo=False):
nst_args = self.sockpath
if sudo:
nst_args = '--keep-caps ' + nst_args
return '{} exec {} -- {}'.format(self.NST_BIN, nst_args, cmd)
def output(self, cmd, sudo=False, **kwargs):
return REAL_HOST.output(self._nst_cmd(cmd, sudo), **kwargs)
def fg(self, cmd, sudo=False, **kwargs):
return REAL_HOST.fg(self._nst_cmd(cmd, sudo), **kwargs)
def bg(self, cmd, sudo=False, **kwargs):
return REAL_HOST.bg(self._nst_cmd(cmd, sudo), **kwargs)
# Create path for temporary nstool Unix socket
#
# The obvious choice would be to use Avocado's workdir, but that often
# gives paths that are too long for Unix sockets
def temp_sockpath(name):
tmpd = tempfile.mkdtemp(suffix=name)
return os.path.join(tmpd, 's')
class UnshareSite(NsToolSite):
def __init__(self, name, unshare_opts, parent=REAL_HOST, sudo=False):
sockpath = temp_sockpath(name)
parent.require_cmds('unshare', self.NST_BIN)
super().__init__(name, sockpath)
self.parent = typecheck(parent, Site)
self.holdcmd = 'unshare {} -- {} hold {}'.format(unshare_opts,
self.NST_BIN, sockpath)
self.sudo = typecheck(sudo, bool)
def __enter__(self):
self.holder = self.parent.bg(self.holdcmd, sudo=self.sudo)
self.holder.__enter__()
return super().__enter__()
def __exit__(self, *exc_details):
super().__exit__(*exc_details)
try:
self.parent.fg('{} stop {}'.format(self.NST_BIN, self.sockpath))
finally:
self.holder.__exit__(*exc_details)
try:
os.remove(self.sockpath)
except FileNotFoundError:
pass
os.rmdir(os.path.dirname(self.sockpath))
class UserNetNsTasst(IsolatedSiteTasst):
"""
Test creating a userns+netns together
:avocado: tags=meta
"""
@contextlib.contextmanager
def setup_site(self):
with UnshareSite(type(self).__name__, '-Ucn') as ns:
ns.ifup('lo')
yield ns
def test_userns(self):
REAL_HOST.require_cmds('capsh')
with self.setup_site() as ns:
ns.require_cmds('capsh')
capcmd = 'capsh --has-p=CAP_SETUID'
self.assertRaises(CmdError, REAL_HOST.fg, capcmd)
ns.fg(capcmd, sudo=True)
class NestedNsTasst(IsolatedSiteTasst):
"""
Test creating userns with a netns nested within
:avocado: tags=meta
"""
@contextlib.contextmanager
def setup_site(self):
name = type(self).__name__
with UnshareSite(name + '.userns', '-Uc') as userns:
with UnshareSite(name + '.netns', '-n', parent=userns, sudo=True) as netns:
netns.ifup('lo')
yield netns
class PidNsTasst(IsolatedSiteTasst):
"""
Test unsing unshare -p to create a pidns
:avocado: tags=meta
"""
@contextlib.contextmanager
def setup_site(self):
with UnshareSite(type(self).__name__, '-Upfn') as ns:
ns.ifup('lo')
yield ns
def test_relative_pid(self):
with self.setup_site() as site:
# The holder is init (pid 1) within its own pidns
self.assertEquals(site.relative_pid(site), 1)
class ConnectNsToolTasst(SiteTasst):
"""
Test connecting to a pre-existing nstool
:avocado: tags=meta
"""
@contextlib.contextmanager
def setup_site(self):
sockpath = temp_sockpath(type(self).__name__)
holdcmd = '{} hold {}'.format(NsToolSite.NST_BIN, sockpath)
with REAL_HOST.bg(holdcmd) as holder:
with NsToolSite("fake ns", sockpath) as site:
yield site
try:
os.remove(sockpath)
finally:
os.rmdir(os.path.dirname(sockpath))
|