+ args = parser.parse_args()
+ slice_name=args.slice_name
+
+ # support for either setting debug at the top of this file, or on the command-line
+ if args.debug:
+ global debug
+ debug=True
+
+ # somehow some older nodes won't be able to find the login name in /etc/passwd
+ # when this is done down the road, so compute slice_uid while in a safe env
+ # even though we don't use the slice_uid any more, this is still
+ # checked later on as a means to ensure existence of the slice account
+ try:
+ slice_uid = pwd.getpwnam(slice_name).pw_uid
+ except Exception, e:
+ if debug:
+ import traceback
+ print 'error while computing slice_uid',e
+ traceback.print_exc()
+ slice_uid=None
+
+ # unless we run the symlink 'lxcsu-internal', or we specify the -i option, prepend '--' '-c'
+ if sys.argv[0].find('internal')>=0: args.internal=True
+
+ if len(args.command_to_run)>0 and (args.command_to_run[0] == "/sbin/service"):
+ # A quick hack to support nodemanager interfaces.py when restarting
+ # networking in a slice.
+ args.nosliceuid = True
+
+ # plain lxcsu
+ if not args.internal:
+ # no command given: enter interactive shell
+ if not args.command_to_run: args.command_to_run=['/bin/sh']
+ args.command_to_run = [ '-c' ] + [" ".join(args.command_to_run)]
+
+ try:
+ cmd = '/usr/bin/virsh --connect lxc:/// domid %s'%slice_name
+ # convert to int as a minimal raincheck
+ driver_pid = int(os.popen(cmd).read().strip())
+ # locate the pid for the - expected - single child, that would be the init for that VM
+ #init_pid = int(open("/proc/%s/task/%s/children"%(driver_pid,driver_pid)).read().strip())
+ init_pid = int(os.popen('pgrep -P %s'%driver_pid).readlines()[0].strip())
+ # Thierry: I am changing the code below to use child_pid instead of driver_pid
+ # for the namespace handling features, that I was able to check
+ # I've left the other ones as they were, i.e. using driver_pid, but I suspect
+ # they chould be changed as well
+
+ except:
+ print "Domain %s not found"%slice_name
+ exit(1)
+
+ if not driver_pid or not init_pid:
+ print "Domain %s not started"%slice_name
+ exit(1)
+
+ if debug: print "Found driver_pid",driver_pid,'and init_pid=',init_pid
+ # xxx probably init_pid here too
+ arch = getarch('/proc/%s/exe'%driver_pid)
+
+ # Set sysctls specific to slice
+ sysctls = []
+ sysctl_dir = '/etc/planetlab/vsys-attributes/%s'%slice_name
+ if (os.access(sysctl_dir,0)):
+ entries = os.listdir(sysctl_dir)
+ for e in entries:
+ prefix = 'vsys_sysctl.'
+ if (e.startswith(prefix)):
+ sysctl_file = '/'.join([sysctl_dir,e])
+ sysctl_name = e[len(prefix):]
+ sysctl_val = open(sysctl_file).read()
+ sysctls.append((sysctl_file, sysctl_name, sysctl_val))
+
+ # xxx probably init_pid here too
+ subdirs = get_cgroup_subdirs_for_pid(driver_pid)
+ sysfs_root = '/sys/fs/cgroup'
+
+ # If the slice is frozen, then we'll get an EBUSY when trying to write to the task
+ # list for the freezer cgroup. Since the user couldn't do anything anyway, it's best
+ # in this case to error out the shell. (an alternative would be to un-freeze it,
+ # add the task, and re-freeze it)
+ # Enter cgroups
+ current_cgroup = ''
+ for subsystem in ['cpuset','memory','blkio','cpuacct','cpuacct,cpu','freezer']:
+ try:
+ current_cgroup = subsystem
+
+ # There seems to be a bug in the cgroup schema: cpuacct,cpu can become cpu,cpuacct
+ # We need to handle both
+ task_path_alt = None
+ try:
+ subsystem_comps = subsystem.split(',')
+ subsystem_comps.reverse()
+ subsystem_alt = ','.join(subsystem_comps)
+ tasks_path_alt = [sysfs_root, subsystem_alt, subdirs[subsystem], 'tasks']
+ except Exception,e:
+ pass
+
+ tasks_path = [sysfs_root,subsystem,subdirs[subsystem],'tasks']
+ tasks_path_str = '/'.join(tasks_path)
+
+ try:
+ f = open(tasks_path_str, 'w')
+ except:
+ tasks_path_alt_str = '/'.join(tasks_path_alt)
+ f = open(tasks_path_alt_str, 'w')
+
+ f.write(str(os.getpid()))
+ if (subsystem=='freezer'):
+ f.close()
+
+ except Exception,e:
+ if (not subdirs.has_key(subsystem)):
+ pass
+ else:
+ if debug: print e
+ print "Error assigning cgroup %s (pid=%s) for slice %s"%(current_cgroup,driver_pid, slice_name)
+ exit(1)
+
+
+ def chcontext (path):
+ retcod = setns.chcontext (path)
+ if retcod != 0:
+ print 'WARNING - setns(%s)=>%s (ignored)'%(path,retcod)
+ return retcod
+
+ # Use init_pid and not driver_pid to locate reference namespaces
+ ref_ns = "/proc/%s/ns/"%init_pid
+
+ if True: chcontext(ref_ns+'uts')
+ if True: chcontext(ref_ns+'ipc')
+
+ if (not args.no_pidns): chcontext(ref_ns+'pid')
+ if (not args.no_netns): chcontext(ref_ns+'net')
+ if (not args.no_mntns): chcontext(ref_ns+'mnt')
+
+ proc_mounted = False
+ if (not os.access('/proc/self',0)):
+ proc_mounted = True
+ setns.proc_mount()
+
+ for (sysctl_file, sysctl_name, sysctl_val) in sysctls:
+ for fn in ["/sbin/sysctl", "/usr/sbin/sysctl", "/bin/sysctl", "/usr/bin/sysctl"]:
+ if os.path.exists(fn):
+ os.system('%s -w %s=%s >/dev/null 2>&1'%(fn, sysctl_name,sysctl_val))
+ break
+ else:
+ print "Error: image does not have a sysctl binary"
+
+ # cgroups is not yet LXC-safe, so we need to use the coarse grained access control
+ # strategy of unmounting the filesystem
+
+ umount_result = True
+ for subsystem in ['cpuset','cpu,cpuacct','memory','devices','freezer','net_cls','blkio','perf_event','systemd']:
+ fs_path = '/sys/fs/cgroup/%s'%subsystem
+ if (not umount(fs_path,'-l')):
+ print 'WARNING - umount failed (ignored) with path=',fs_path
+ pass
+ # Leaving these comments for historical reference
+ #print "Error disabling cgroup access"
+ #exit(1) - Don't need this because failure here implies failure in the call to umount /sys/fs/cgroup
+
+ if (not umount('/sys/fs/cgroup')):
+ print "Error disabling cgroup access"
+ exit(1)
+
+ fork_pid = os.fork()