- return ('device is busy' not in fs_dir)
-
-parser = OptionParser()
-parser.add_option("-n", "--nonet",
- action="store_true", dest="netns", default=False,
- help="Don't enter network namespace")
-parser.add_option("-m", "--nomnt",
- action="store_true", dest="mntns", default=False,
- help="Don't enter mount namespace")
-parser.add_option("-p", "--nopid",
- action="store_true", dest="pidns", default=False,
- help="Don't enter pid namespace")
-parser.add_option("-r", "--root",
- action="store_true", dest="root", default=False,
- help="Enter as root: be careful")
-
-(options, args) = parser.parse_args()
-
-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)
-
-setns.chcontext('/proc/%s/ns/uts'%pid)
-setns.chcontext('/proc/%s/ns/ipc'%pid)
-
-if (not options.netns):
- setns.chcontext('/proc/%s/ns/net'%pid)
-
-if (not options.mntns):
- open('/proc/lxcsu','w').write(pid)
-
-if (not options.pidns):
- 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"
+ return ('device is busy' not in output)
+
+def main ():
+ parser = ArgumentParser()
+ parser.add_argument("-n", "--nonet",
+ action="store_true", dest="netns", default=False,
+ help="Don't enter network namespace")
+ parser.add_argument("-m", "--nomnt",
+ action="store_true", dest="mntns", default=False,
+ help="Don't enter mount namespace")
+ parser.add_argument("-p", "--nopid",
+ action="store_true", dest="pidns", default=False,
+ help="Don't enter pid namespace")
+ parser.add_argument("-r", "--root",
+ action="store_true", dest="root", default=False,
+ help="Enter as root: be careful")
+ parser.add_argument("-i","--internal",
+ action="store_true", dest="internal", default=False,
+ help="does *not* prepend '-- -c' to arguments - or invoke lxcsu-internal")
+ parser.add_argument("-d","--debug",
+ action='store_true', dest='debug', default=False,
+ help="debug option")
+ parser.add_argument ("slice_name")
+ parser.add_argument ("command_to_run",nargs="*")
+
+ args = parser.parse_args()
+ slice_name=args.slice_name
+
+ # 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
+
+ # 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' ] + args.command_to_run
+
+ # support for either setting debug at the top of this file, or on the command-line
+ if args.debug:
+ global debug
+ debug=True
+
+ 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
+
+ # provide a default as this is not always properly computed
+ arch = None
+
+ for e in output:
+ try:
+ l = e.rstrip()
+ path = l.split(':')[0]
+ comp = l.rsplit(':')[-1]
+ slice_name_check = comp.rsplit('/')[-1]
+ if debug: print "dealing with >%s<"%slice_name_check
+
+ if (slice_name_check == slice_name):
+ if debug: print "found %s"%slice_name
+ slice_path = path
+ pid = slice_path.split('/')[2]
+ cmdline = open('/proc/%s/cmdline'%pid).read().rstrip('\n\x00')
+ if (cmdline == '/sbin/init') or (cmdline.startswith("init [")):
+ slice_spec = slice_path
+ arch = getarch('/proc/%s/exe'%pid)
+ break
+ except Exception,e:
+ if debug:
+ import traceback
+ print "BEG lxcsu - ignoring exception"
+ traceback.print_exc()
+ print "END lxcsu - ignoring exception"
+ pass
+
+ if (not slice_spec or not pid):
+ print "Not started: %s"%slice_name