8 from argparse import ArgumentParser
10 # can set to True here, but also use the -d option
14 output = os.popen('readelf -h %s 2>&1'%f).readlines()
15 classlines = [x for x in output if ('Class' in x.split(':')[0])]
17 c = line.split(':')[1]
23 raise Exception('Could not determine architecture')
25 def get_cgroup_subdirs_for_pid(pid):
26 cgroup_info_file = '/proc/%s/cgroup'%pid
27 cgroup_lines = open(cgroup_info_file).read().splitlines()
30 for line in cgroup_lines:
32 _, cgroup_name, subdir = line.split(':')
33 subdirs[cgroup_name] = subdir
35 print "Error reading cgroup info: %s"%str(e)
41 def umount(fs_dir, opts=''):
42 output = os.popen('/bin/umount %s %s 2>&1'%(opts, fs_dir)).read()
43 return ('device is busy' not in output)
45 def kvmsu(slice_name, args):
46 # Find MAC address of virt interface
47 ifstr = os.popen('/usr/bin/virsh domiflist %s'%slice_name).read().strip()
48 mac_address = ifstr.split()[-1]
50 # Find IP address of virt interface
51 ipaddr_str = os.popen('arp -an | grep %s'%'78:2b:cb:2d:f0:60').read().strip()
52 ip_addr_part = ipaddr_str.split()[1]
53 if (ip_addr_part[0]=='(' and ip_addr_part[-1]==')'):
54 ip_addr = ip_addr_part[1:len(ip_addr_part)-1]
56 os.execv('/usr/bin/ssh',['/usr/bin/ssh','-o','StrictHostKeyChecking=no','root@%s'%ip_addr] + args.command_to_run)
59 def lxcsu(slice_name, args):
62 # no command given: enter interactive shell
63 if not args.command_to_run: args.command_to_run=['/bin/sh']
64 args.command_to_run = [ '-c' ] + [" ".join(args.command_to_run)]
66 # support for either setting debug at the top of this file, or on the command-line
72 cmd = '/usr/bin/virsh --connect lxc:/// domid %s'%slice_name
73 # convert to int as a minimal raincheck
74 driver_pid = int(os.popen(cmd).read().strip())
75 # locate the pid for the - expected - single child, that would be the init for that VM
76 #init_pid = int(open("/proc/%s/task/%s/children"%(driver_pid,driver_pid)).read().strip())
77 init_pid = int(os.popen('pgrep -P %s'%driver_pid).readlines()[0].strip())
78 # Thierry: I am changing the code below to use child_pid instead of driver_pid
79 # for the namespace handling features, that I was able to check
80 # I've left the other ones as they were, i.e. using driver_pid, but I suspect
81 # they chould be changed as well
84 print "Domain %s not found"%slice_name
87 if not driver_pid or not init_pid:
88 print "Domain %s not started"%slice_name
91 if debug: print "Found driver_pid",driver_pid,'and init_pid=',init_pid
92 # xxx probably init_pid here too
93 arch = getarch('/proc/%s/exe'%driver_pid)
95 # Set sysctls specific to slice
97 sysctl_dir = '/etc/planetlab/vsys-attributes/%s'%slice_name
98 if (os.access(sysctl_dir,0)):
99 entries = os.listdir(sysctl_dir)
101 prefix = 'vsys_sysctl.'
102 if (e.startswith(prefix)):
103 sysctl_file = '/'.join([sysctl_dir,e])
104 sysctl_name = e[len(prefix):]
105 sysctl_val = open(sysctl_file).read()
106 sysctls.append((sysctl_file, sysctl_name, sysctl_val))
108 # xxx probably init_pid here too
109 subdirs = get_cgroup_subdirs_for_pid(driver_pid)
110 sysfs_root = '/sys/fs/cgroup'
112 # If the slice is frozen, then we'll get an EBUSY when trying to write to the task
113 # list for the freezer cgroup. Since the user couldn't do anything anyway, it's best
114 # in this case to error out the shell. (an alternative would be to un-freeze it,
115 # add the task, and re-freeze it)
118 for subsystem in ['cpuset','memory','blkio','cpuacct','cpuacct,cpu','freezer']:
120 current_cgroup = subsystem
122 # There seems to be a bug in the cgroup schema: cpuacct,cpu can become cpu,cpuacct
123 # We need to handle both
126 subsystem_comps = subsystem.split(',')
127 subsystem_comps.reverse()
128 subsystem_alt = ','.join(subsystem_comps)
129 tasks_path_alt = [sysfs_root, subsystem_alt, subdirs[subsystem], 'tasks']
133 tasks_path = [sysfs_root,subsystem,subdirs[subsystem],'tasks']
134 tasks_path_str = '/'.join(tasks_path)
137 f = open(tasks_path_str, 'w')
139 tasks_path_alt_str = '/'.join(tasks_path_alt)
140 f = open(tasks_path_alt_str, 'w')
142 f.write(str(os.getpid()))
143 if (subsystem=='freezer'):
147 if (not subdirs.has_key(subsystem)):
151 print "Error assigning cgroup %s (pid=%s) for slice %s"%(current_cgroup,driver_pid, slice_name)
155 def chcontext (path):
156 retcod = setns.chcontext (path)
158 print 'WARNING - setns(%s)=>%s (ignored)'%(path,retcod)
161 # Use init_pid and not driver_pid to locate reference namespaces
162 ref_ns = "/proc/%s/ns/"%init_pid
164 if True: chcontext(ref_ns+'uts')
165 if True: chcontext(ref_ns+'ipc')
167 if (not args.no_pidns): chcontext(ref_ns+'pid')
168 if (not args.no_netns): chcontext(ref_ns+'net')
169 if (not args.no_mntns): chcontext(ref_ns+'mnt')
172 if (not os.access('/proc/self',0)):
176 for (sysctl_file, sysctl_name, sysctl_val) in sysctls:
177 for fn in ["/sbin/sysctl", "/usr/sbin/sysctl", "/bin/sysctl", "/usr/bin/sysctl"]:
178 if os.path.exists(fn):
179 os.system('%s -w %s=%s >/dev/null 2>&1'%(fn, sysctl_name,sysctl_val))
182 print "Error: image does not have a sysctl binary"
184 # cgroups is not yet LXC-safe, so we need to use the coarse grained access control
185 # strategy of unmounting the filesystem
188 for subsystem in ['cpuset','cpu,cpuacct','memory','devices','freezer','net_cls','blkio','perf_event','systemd']:
189 fs_path = '/sys/fs/cgroup/%s'%subsystem
190 if (not umount(fs_path,'-l')):
191 print 'WARNING - umount failed (ignored) with path=',fs_path
193 # Leaving these comments for historical reference
194 #print "Error disabling cgroup access"
195 #exit(1) - Don't need this because failure here implies failure in the call to umount /sys/fs/cgroup
197 if (not umount('/sys/fs/cgroup')):
198 print "Error disabling cgroup access"
203 def getuid (slicename):
206 return pwd.getpwnam(slicename).pw_uid
213 if (args.nosliceuid):
214 # we still want to drop capabilities, but don't want to switch UIDs
215 exec_args = [arch,'/bin/sh','--login',]+args.command_to_run
217 # let's keep this check even though we don't use the uid
218 # as a way of checking the existence of the slice account
219 uid = getuid (slice_name)
221 print "lxcsu could not spot %s in /etc/passwd - exiting"%slice_name
223 exec_args = [arch,'/usr/bin/sudo','-u',slice_name,'/bin/sh','--login',]+args.command_to_run
224 # once we can drop f12, it would be nicer to instead go for
225 # exec_args = [arch,'/usr/sbin/capsh',cap_arg,'--user=%s'%slice_name,'--login',]+args.command_to_run
227 exec_args = [arch,'/bin/sh','--login']+args.command_to_run
229 os.environ['SHELL'] = '/bin/sh'
230 if os.path.exists('/etc/planetlab/lib/bind_public.so'):
231 os.environ['LD_PRELOAD'] = '/etc/planetlab/lib/bind_public.so'
232 if not args.noslicehome:
233 os.environ['HOME'] = '/home/%s'%slice_name
234 os.chdir("/home/%s"%(slice_name))
235 if debug: print 'lxcsu:execv:','/usr/bin/setarch',exec_args
236 os.execv('/usr/bin/setarch',exec_args)
239 _,status = os.waitpid(fork_pid,0)
240 exit(os.WEXITSTATUS(status))
243 parser = ArgumentParser()
244 parser.add_argument("-n", "--nonet",
245 action="store_true", dest="no_netns", default=False,
246 help="Don't enter network namespace")
247 parser.add_argument("-m", "--nomnt",
248 action="store_true", dest="no_mntns", default=False,
249 help="Don't enter mount namespace")
250 parser.add_argument("-p", "--nopid",
251 action="store_true", dest="no_pidns", default=False,
252 help="Don't enter pid namespace")
253 parser.add_argument("-r", "--root",
254 action="store_true", dest="root", default=False,
255 help="Enter as root: be careful")
256 parser.add_argument("-i","--internal",
257 action="store_true", dest="internal", default=False,
258 help="does *not* prepend '-- -c' to arguments - or invoke lxcsu-internal")
259 parser.add_argument("-d","--debug",
260 action='store_true', dest='debug', default=False,
262 parser.add_argument("-s","--nosliceuid",
263 action='store_true', dest="nosliceuid", default=False,
264 help="do not change to slice uid inside of slice")
265 parser.add_argument("-o","--noslicehome",
266 action='store_true', dest="noslicehome", default=False,
267 help="do not change to slice home directory inside of slice")
269 if os.path.exists("/etc/lxcsu_default"):
270 defaults = parser.parse_args(file("/etc/lxcsu_default","r").read().split())
271 parser.set_defaults(**defaults.__dict__)
273 parser.add_argument ("slice_name")
274 parser.add_argument ("command_to_run",nargs="*")
276 args = parser.parse_args()
277 slice_name=args.slice_name
279 # unless we run the symlink 'lxcsu-internal', or we specify the -i option, prepend '--' '-c'
280 if sys.argv[0].find('internal')>=0: args.internal=True
282 if len(args.command_to_run)>0 and (args.command_to_run[0] == "/sbin/service"):
283 # A quick hack to support nodemanager interfaces.py when restarting
284 # networking in a slice.
285 args.nosliceuid = True
288 cmd = '/usr/bin/virsh dominfo %s'%slice_name
289 info = os.popen(cmd).read()
293 for line in info.split('\n'):
294 pair = line.split(':')
295 d[pair[0].strip()] = pair[1].strip()
296 if (pair[0].strip()=='OS Type'):
297 ostype = pair[1].strip()
300 print "Domain %s not found"%slice_name
302 is_kvm = ostype=='hvm'
305 kvmsu(slice_name, args)
307 lxcsu(slice_name, args)
309 if __name__ == '__main__':