-#from optparse import OptionParser
-
-drop_capabilities='cap_sys_admin,cap_sys_boot,cap_sys_module'
-
-def umount(fs_dir):
- output = os.popen('/bin/umount %s 2>&1'%fs_dir).read()
- return ('device is busy' not in fs_dir)
-
-
-"""
-parser = OptionParser()
-parser.add_option("-n", "--net",
- action="store_true", dest="netns", default=False,
- help="Enter network namespace")
-parser.add_option("-m", "--mnt",
- action="store_true", dest="mntns", default=False,
- help="Enter mount namespace")
-parser.add_option("-p", "--pid",
- action="store_true", dest="pidns", default=False,
- help="Enter pid namespace")
-
-(options, args) = parser.parse_args()
-"""
-args = sys.argv[1:]
-
-try:
- slice_name = args[0]
-except IndexError:
- print "You must specify a vm name"
- exit(1)
-
-try:
- cmd = 'grep %s /proc/*/cgroup | grep freezer'%slice_name
- output = os.popen(cmd).readlines()
-except:
- print "Error finding slice %s"%slice_name
- exit(1)
-
-slice_spec = None
-for e in output:
- try:
- l = e.rstrip()
- path = l.split(':')[0]
- comp = l.rsplit(':')[-1]
- slice_name_check = comp.rsplit('/')[-1]
-
- if (slice_name_check == slice_name):
- slice_path = path
- pid = slice_path.split('/')[2]
- cmdline = open('/proc/%s/cmdline'%pid).read().rstrip('\n\x00')
- if (cmdline == '/sbin/init'):
- slice_spec = slice_path
- break
- except:
- break
-
-if (not slice_spec or not pid):
- print "Not started: %s"%slice_name
- exit(1)
-
-# Enter cgroups
-try:
- for subsystem in ['cpuset','memory','blkio']:
- open('/sys/fs/cgroup/%s/libvirt/lxc/%s/tasks'%(subsystem,slice_name),'w').write(str(os.getpid()))
-
-except:
- print "Error assigning resources: %s"%slice_name
- exit(1)
-
-try:
- open('/sys/fs/cgroup/cpuacct/system/libvirtd.service/libvirt/lxc/%s/tasks'%slice_name,'w').write(str(os.getpid()))
-except:
- print "Error assigning cpuacct: %s" % slice_name
- exit(1)
-
-# 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)
-try:
- f=open('/sys/fs/cgroup/freezer/libvirt/lxc/%s/tasks'%(slice_name),'w')
- f.write(str(os.getpid()))
- # note: we need to call f.close() explicitly, or we'll get an exception in
- # the object destructor, which will not be caught
- f.close()
-except:
- print "Error adding task to freezer cgroup. Slice is probably frozen: %s" % slice_name
- exit(1)
-
-r1 = setns.chcontext('/proc/%s/ns/uts'%pid)
-r2 = setns.chcontext('/proc/%s/ns/ipc'%pid)
-r3 = setns.chcontext('/proc/%s/ns/net'%pid)
-
-open('/proc/lxcsu','w').write(pid)
-open('/proc/pidsu','w').write(pid)
-
-# cgroups is not yet LXC-safe, so we need to use the course 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']:
- fs_path = '/sys/fs/cgroup/%s'%subsystem
- if (not umount(fs_path)):
- print "Error disabling cgroup access"
+ # 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 init_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
+ # some should 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)
+ # driver_pid is always x86_64, we need to look at the VM's init process here
+ arch = getarch(init_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 as 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 as e:
+ if (subsystem not in subdirs):
+ 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")