8 #from optparse import OptionParser
10 drop_capabilities='cap_sys_admin,cap_sys_boot,cap_sys_module'.split(',')
13 parser = OptionParser()
14 parser.add_option("-n", "--net",
15 action="store_true", dest="netns", default=False,
16 help="Enter network namespace")
17 parser.add_option("-m", "--mnt",
18 action="store_true", dest="mntns", default=False,
19 help="Enter mount namespace")
20 parser.add_option("-p", "--pid",
21 action="store_true", dest="pidns", default=False,
22 help="Enter pid namespace")
24 (options, args) = parser.parse_args()
31 print "You must specify a vm name"
35 cmd = 'grep %s /proc/*/cgroup | grep freezer'%slice_name
36 output = os.popen(cmd).readlines()
38 print "Error finding slice %s"%slice_name
45 path = l.split(':')[0]
46 comp = l.rsplit(':')[-1]
47 slice_name_check = comp.rsplit('/')[-1]
49 if (slice_name_check == slice_name):
51 pid = slice_path.split('/')[2]
52 cmdline = open('/proc/%s/cmdline'%pid).read().rstrip('\n\x00')
53 if (cmdline == '/sbin/init'):
54 slice_spec = slice_path
59 if (not slice_spec or not pid):
60 print "Not started: %s"%slice_name
65 for subsystem in ['cpuset','memory','blkio']:
66 open('/sys/fs/cgroup/%s/libvirt/lxc/%s/tasks'%(subsystem,slice_name),'w').write(str(os.getpid()))
69 print "Error assigning resources: %s"%slice_name
72 # If the slice is frozen, then we'll get an EBUSY when trying to write to the task
73 # list for the freezer cgroup. Since the user couldn't do anything anyway, it's best
74 # in this case to error out the shell. (an alternative would be to un-freeze it,
75 # add the task, and re-freeze it)
77 f=open('/sys/fs/cgroup/freezer/libvirt/lxc/%s/tasks'%(slice_name),'w')
78 f.write(str(os.getpid()))
79 # note: we need to call f.close() explicitly, or we'll get an exception in
80 # the object destructor, which will not be caught
83 print "Error adding task to freezer cgroup. Slice is probably frozen: %s" % slice_name
86 r1 = setns.chcontext('/proc/%s/ns/uts'%pid)
87 r2 = setns.chcontext('/proc/%s/ns/ipc'%pid)
88 r3 = setns.chcontext('/proc/%s/ns/net'%pid)
90 open('/proc/lxcsu','w').write(pid)
91 open('/proc/pidsu','w').write(pid)
95 cap_args = map(lambda c:'--drop='+c, drop_capabilities)
98 os.execv('/usr/sbin/capsh',cap_args+['--','--login']+args[1:])
99 os.environ['SHELL'] = '/bin/sh'