import setns
import os
+import sys
-from optparse import OptionParser
+#from optparse import OptionParser
+drop_capabilities='cap_sys_admin,cap_sys_boot,cap_sys_module'.split(',')
+
+"""
parser = OptionParser()
parser.add_option("-n", "--net",
action="store_true", dest="netns", default=False,
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]
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:
break
-if (not slice_spec):
- print "Could not find any processes associated with %s"%slice_name
+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)
-#os.closerange(0,1024)
+# 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/utc'%pid)
r2 = setns.chcontext('/proc/%s/ns/ipc'%pid)
path = '/proc/%s/ns/net'%pid
r3 = setns.chcontext(path)
-os.system('whoami')
+
open('/proc/lxcsu','w').write(pid)
-os.system('mount none -t proc /proc')
-os.execv('/bin/sh',['/bin/sh'])
+open('/proc/pidsu','w').write(pid)
+
+
+
+pid = os.fork()
+
+cap_args = map(lambda c:'--drop='+c, drop_capabilities)
+
+if (pid == 0):
+ os.execv('/usr/sbin/capsh',cap_args+['--']+args[1:])
+else:
+ os.waitpid(pid,0)