3 # pylint: disable=c0111, w0703
9 from argparse import ArgumentParser
13 # can set to True here, but also use the -d option
18 output = os.popen('readelf -h %s 2>&1' % file).readlines()
19 classlines = [x for x in output if 'Class' in x.split(':')[0]]
21 token = line.split(':')[1]
26 raise Exception('Could not determine architecture')
29 def get_cgroup_subdirs_for_pid(pid):
30 cgroup_info_file = '/proc/%s/cgroup' % pid
31 cgroup_lines = open(cgroup_info_file).read().splitlines()
34 for line in cgroup_lines:
36 _, cgroup_name, subdir = line.split(':')
37 subdirs[cgroup_name] = subdir
38 except Exception as exc:
39 print("Error reading cgroup info: %s" % str(exc))
44 def umount(fs_dir, opts=''):
45 output = os.popen('/bin/umount %s %s 2>&1' % (opts, fs_dir)).read()
46 return 'device is busy' not in output
49 def kvmsu(slice_name, args):
52 # Find MAC addresses of virt interfaces
53 process = os.popen("virsh domiflist %s" % slice_name)
55 match = re.search(r'([0-9A-F]{2}[:-]){5}([0-9A-F]{2})', line, re.I)
57 mac_addresses.append(match.group())
59 # Find IP address of a reachable virt interface
60 # Here we're taking the one attached to br-nat, but this is specific to OpenCloud
63 with open('/var/lib/dnsmasq/br-nat.hosts', 'r') as feed:
65 for mac in mac_addresses:
66 match = re.search("^%s,[0-9.]+$" % mac, line, re.I)
68 ip_addr = match.group().split(',')[1]
74 # Need to login to a Ubuntu Cloud image as 'ubuntu' user
75 # Not sure how to make this more general
76 os.execv('/usr/bin/ssh',
77 ['/usr/bin/ssh', '-o', 'StrictHostKeyChecking=no',
78 'ubuntu@%s' % ip_addr]
79 + args.command_to_run)
81 # What should happen here?
82 print("Cannot map instance to IP address")
86 def lxcsu(slice_name, args):
89 # no command given: enter interactive shell
90 if not args.command_to_run:
91 args.command_to_run = ['/bin/sh']
92 args.command_to_run = ['-c'] + [" ".join(args.command_to_run)]
94 # support for either setting debug at the top of this file, or on the command-line
100 cmd = '/usr/bin/virsh --connect lxc:/// domid %s' % slice_name
101 # convert to int as a minimal raincheck
102 driver_pid = int(os.popen(cmd).read().strip())
103 # locate the pid for the - expected - single child, that would be the init for that VM
104 #init_pid = int(open("/proc/%s/task/%s/children"%(driver_pid,driver_pid)).read().strip())
105 init_pid = int(os.popen('pgrep -P %s' %
106 driver_pid).readlines()[0].strip())
107 # Thierry: I am changing the code below to use child_pid instead of driver_pid
108 # for the namespace handling features, that I was able to check
109 # I've left the other ones as they were, i.e. using driver_pid, but I suspect
110 # they chould be changed as well
113 print("Domain %s not found" % slice_name)
116 if not driver_pid or not init_pid:
117 print("Domain %s not started" % slice_name)
121 print("Found driver_pid", driver_pid, 'and init_pid=', init_pid)
122 arch = getarch('/proc/%s/exe' % driver_pid)
124 # Set sysctls specific to slice
126 sysctl_dir = '/etc/planetlab/vsys-attributes/%s' % slice_name
127 if os.access(sysctl_dir, 0):
128 entries = os.listdir(sysctl_dir)
129 for entry in entries:
130 prefix = 'vsys_sysctl.'
131 if entry.startswith(prefix):
132 sysctl_file = '/'.join([sysctl_dir, entry])
133 sysctl_name = entry[len(prefix):]
134 with open(sysctl_file) as feed:
135 sysctl_val = feed.read()
136 sysctls.append((sysctl_file, sysctl_name, sysctl_val))
138 subdirs = get_cgroup_subdirs_for_pid(driver_pid)
139 sysfs_root = '/sys/fs/cgroup'
141 # If the slice is frozen, then we'll get an EBUSY when trying to write to the task
142 # list for the freezer cgroup. Since the user couldn't do anything anyway, it's best
143 # in this case to error out the shell. (an alternative would be to un-freeze it,
144 # add the task, and re-freeze it)
147 for subsystem in ['cpuset', 'memory', 'blkio', 'cpuacct', 'cpuacct,cpu', 'freezer']:
149 current_cgroup = subsystem
151 # There seems to be a bug in the cgroup schema: cpuacct,cpu can become cpu,cpuacct
152 # We need to handle both
154 subsystem_comps = subsystem.split(',')
155 subsystem_comps.reverse()
156 subsystem_alt = ','.join(subsystem_comps)
157 tasks_path_alt = [sysfs_root, subsystem_alt,
158 subdirs[subsystem], 'tasks']
162 tasks_path = [sysfs_root, subsystem, subdirs[subsystem], 'tasks']
163 tasks_path_str = '/'.join(tasks_path)
166 feed = open(tasks_path_str, 'w')
168 tasks_path_alt_str = '/'.join(tasks_path_alt)
169 feed = open(tasks_path_alt_str, 'w')
171 feed.write(str(os.getpid()))
172 if subsystem == 'freezer':
175 except Exception as exc:
176 if subsystem not in subdirs:
181 print("Error assigning cgroup %s (pid=%s) for slice %s" %
182 (current_cgroup, driver_pid, slice_name))
186 retcod = setns.chcontext(path)
188 print('WARNING - setns(%s)=>%s (ignored)' % (path, retcod))
191 # Use init_pid and not driver_pid to locate reference namespaces
192 ref_ns = "/proc/%s/ns/" % init_pid
195 chcontext(ref_ns+'uts')
197 chcontext(ref_ns+'ipc')
199 if not args.no_pidns:
200 chcontext(ref_ns+'pid')
201 if not args.no_netns:
202 chcontext(ref_ns+'net')
203 if not args.no_mntns:
204 chcontext(ref_ns+'mnt')
206 if not os.access('/proc/self', 0):
209 for (sysctl_file, sysctl_name, sysctl_val) in sysctls:
210 for binary in ["/sbin/sysctl", "/usr/sbin/sysctl", "/bin/sysctl", "/usr/bin/sysctl"]:
211 if os.path.exists(binary):
212 os.system('%s -w %s=%s >/dev/null 2>&1' %
213 (binary, sysctl_name, sysctl_val))
216 print("Error: image does not have a sysctl binary")
218 # cgroups is not yet LXC-safe, so we need to use the coarse grained access control
219 # strategy of unmounting the filesystem
221 for subsystem in ['cpuset', 'cpu,cpuacct', 'memory', 'devices', 'freezer',
222 'net_cls', 'blkio', 'perf_event', 'systemd']:
223 fs_path = '/sys/fs/cgroup/%s' % subsystem
224 if not umount(fs_path, '-l'):
225 print('WARNING - umount failed (ignored) with path=', fs_path)
226 # Leaving these comments for historical reference
227 # print "Error disabling cgroup access"
228 # exit(1) - Don't need this because failure here implies failure
229 # in the call to umount /sys/fs/cgroup
231 if not umount('/sys/fs/cgroup'):
232 print("Error disabling cgroup access")
237 def getuid(slicename):
240 return pwd.getpwnam(slicename).pw_uid
248 # we still want to drop capabilities, but don't want to switch UIDs
249 exec_args = [arch, '/bin/sh', '--login', ] + args.command_to_run
251 # let's keep this check even though we don't use the uid
252 # as a way of checking the existence of the slice account
253 uid = getuid(slice_name)
255 print("lxcsu could not spot %s in /etc/passwd - exiting" %
258 exec_args = [arch, '/usr/bin/sudo', '-u', slice_name,
259 '/bin/sh', '--login', ] + args.command_to_run
260 # once we can drop f12, it would be nicer to instead go for
261 # exec_args = [arch,'/usr/sbin/capsh',cap_arg,'--user=%s'%slice_name,'--login',]+args.command_to_run
263 exec_args = [arch, '/bin/sh', '--login'] + args.command_to_run
265 os.environ['SHELL'] = '/bin/sh'
266 if os.path.exists('/etc/planetlab/lib/bind_public.so'):
267 os.environ['LD_PRELOAD'] = '/etc/planetlab/lib/bind_public.so'
268 if not args.noslicehome:
269 os.environ['HOME'] = '/home/%s' % slice_name
270 os.chdir("/home/%s" % (slice_name))
272 print('lxcsu:execv:', '/usr/bin/setarch', exec_args)
273 os.execv('/usr/bin/setarch', exec_args)
276 _, status = os.waitpid(fork_pid, 0)
277 exit(os.WEXITSTATUS(status))
281 parser = ArgumentParser()
284 action="store_true", dest="no_netns", default=False,
285 help="Don't enter network namespace")
288 action="store_true", dest="no_mntns", default=False,
289 help="Don't enter mount namespace")
292 action="store_true", dest="no_pidns", default=False,
293 help="Don't enter pid namespace")
296 action="store_true", dest="root", default=False,
297 help="Enter as root: be careful")
300 action="store_true", dest="internal", default=False,
301 help="does *not* prepend '-- -c' to arguments - or invoke lxcsu-internal")
304 action='store_true', dest='debug', default=False,
307 "-s", "--nosliceuid",
308 action='store_true', dest="nosliceuid", default=False,
309 help="do not change to slice uid inside of slice")
311 "-o", "--noslicehome",
312 action='store_true', dest="noslicehome", default=False,
313 help="do not change to slice home directory inside of slice")
315 if os.path.exists("/etc/lxcsu_default"):
316 with open("/etc/lxcsu_default", "r") as feed:
317 defaults = parser.parse_args(feed.read().split())
318 parser.set_defaults(**defaults.__dict__)
320 parser.add_argument("slice_name")
321 parser.add_argument("command_to_run", nargs="*")
323 args = parser.parse_args()
324 slice_name = args.slice_name
326 # unless we run the symlink 'lxcsu-internal', or we specify the -i option, prepend '--' '-c'
327 if sys.argv[0].find('internal') >= 0:
330 if args.command_to_run and (args.command_to_run[0] == "/sbin/service"):
331 # A quick hack to support nodemanager interfaces.py when restarting
332 # networking in a slice.
333 args.nosliceuid = True
336 cmd = '/usr/bin/virsh dominfo %s' % slice_name
337 info = os.popen(cmd).read()
341 for line in info.split('\n'):
342 pair = line.split(':')
343 useless_hash[pair[0].strip()] = pair[1].strip()
344 if pair[0].strip() == 'OS Type':
345 ostype = pair[1].strip()
348 print("Domain %s not found" % slice_name)
350 is_kvm = ostype == 'hvm'
353 kvmsu(slice_name, args)
355 lxcsu(slice_name, args)
358 if __name__ == '__main__':