# can set to True here, but also use the -d option
debug = False
+
def getarch(pid):
- exe_filename='/proc/%s/exe'%pid
- output = os.popen('readelf -h %s 2>&1'%exe_filename).readlines()
+ exe_filename = '/proc/%s/exe' % pid
+ output = os.popen('readelf -h %s 2>&1' % exe_filename).readlines()
classlines = [x for x in output if ('Class' in x.split(':')[0])]
line = classlines[0]
c = line.split(':')[1]
elif ('ELF32' in c):
return 'i686'
else:
- raise Exception('Could not determine architecture for pid %s'%pid)
+ raise Exception('Could not determine architecture for pid %s' % pid)
+
def get_cgroup_subdirs_for_pid(pid):
- cgroup_info_file = '/proc/%s/cgroup'%pid
+ cgroup_info_file = '/proc/%s/cgroup' % pid
cgroup_lines = open(cgroup_info_file).read().splitlines()
subdirs = {}
_, cgroup_name, subdir = line.split(':')
subdirs[cgroup_name] = subdir
except Exception as e:
- print("Error reading cgroup info: %s"%str(e))
+ print("Error reading cgroup info: %s" % str(e))
pass
return subdirs
def umount(fs_dir, opts=''):
- output = os.popen('/bin/umount %s %s 2>&1'%(opts, fs_dir)).read()
+ output = os.popen('/bin/umount %s %s 2>&1' % (opts, fs_dir)).read()
return ('device is busy' not in output)
-def main ():
+
+def main():
parser = ArgumentParser()
parser.add_argument("-n", "--nonet",
- action="store_true", dest="no_netns", default=False,
- help="Don't enter network namespace")
+ action="store_true", dest="no_netns", default=False,
+ help="Don't enter network namespace")
parser.add_argument("-m", "--nomnt",
- action="store_true", dest="no_mntns", default=False,
- help="Don't enter mount namespace")
+ action="store_true", dest="no_mntns", default=False,
+ help="Don't enter mount namespace")
parser.add_argument("-p", "--nopid",
- action="store_true", dest="no_pidns", default=False,
- help="Don't enter pid namespace")
+ action="store_true", dest="no_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("-s","--nosliceuid",
- action='store_true', dest="nosliceuid", default=False,
- help="do not change to slice uid inside of slice")
- parser.add_argument("-o","--noslicehome",
- action='store_true', dest="noslicehome", default=False,
- help="do not change to slice home directory inside of slice")
+ 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("-s", "--nosliceuid",
+ action='store_true', dest="nosliceuid", default=False,
+ help="do not change to slice uid inside of slice")
+ parser.add_argument("-o", "--noslicehome",
+ action='store_true', dest="noslicehome", default=False,
+ help="do not change to slice home directory inside of slice")
if os.path.exists("/etc/lxcsu_default"):
- defaults = parser.parse_args(file("/etc/lxcsu_default","r").read().split())
+ defaults = parser.parse_args(
+ file("/etc/lxcsu_default", "r").read().split())
parser.set_defaults(**defaults.__dict__)
- parser.add_argument ("slice_name")
- parser.add_argument ("command_to_run",nargs="*")
+ parser.add_argument("slice_name")
+ parser.add_argument("command_to_run", nargs="*")
args = parser.parse_args()
- slice_name=args.slice_name
+ 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
+ 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
except Exception as e:
if debug:
import traceback
- print('error while computing slice_uid',e)
+ print('error while computing slice_uid', e)
traceback.print_exc()
- slice_uid=None
+ 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 sys.argv[0].find('internal') >= 0:
+ args.internal = True
- if len(args.command_to_run)>0 and (args.command_to_run[0] == "/sbin/service"):
+ 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)]
+ # 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
+ 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())
+ 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())
+ 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)
+ 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)
+ print("Domain %s not started" % slice_name)
+ exit(1)
- if debug: print("Found driver_pid",driver_pid,'and init_pid=',init_pid)
+ 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)):
+ sysctl_dir = '/etc/planetlab/vsys-attributes/%s' % slice_name
+ if (os.access(sysctl_dir, 0)):
entries = os.listdir(sysctl_dir)
- for e in entries:
+ 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))
+ 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)
# add the task, and re-freeze it)
# Enter cgroups
current_cgroup = ''
- for subsystem in ['cpuset','memory','blkio','cpuacct','cpuacct,cpu','freezer']:
+ for subsystem in ['cpuset', 'memory', 'blkio', 'cpuacct', 'cpuacct,cpu', 'freezer']:
try:
current_cgroup = subsystem
# 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']
+ 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 = [sysfs_root, subsystem, subdirs[subsystem], 'tasks']
tasks_path_str = '/'.join(tasks_path)
try:
f = open(tasks_path_alt_str, 'w')
f.write(str(os.getpid()))
- if (subsystem=='freezer'):
+ 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))
+ 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)
+ def chcontext(path):
+ retcod = setns.chcontext(path)
if retcod != 0:
- print('WARNING - setns(%s)=>%s (ignored)'%(path,retcod))
+ 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
+ ref_ns = "/proc/%s/ns/" % init_pid
- if True: chcontext(ref_ns+'uts')
- if True: chcontext(ref_ns+'ipc')
+ 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')
+ 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()
+ 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")
+ 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
+ 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")
setns.drop_caps()
if (args.nosliceuid):
# we still want to drop capabilities, but don't want to switch UIDs
- exec_args = [arch,'/bin/sh','--login',]+args.command_to_run
+ exec_args = [arch, '/bin/sh', '--login', ]+args.command_to_run
else:
if not slice_uid:
- print("lxcsu could not spot %s in /etc/passwd - exiting"%slice_name)
+ print("lxcsu could not spot %s in /etc/passwd - exiting" %
+ slice_name)
exit(1)
- exec_args = [arch,'/usr/bin/sudo','-u',slice_name,'/bin/sh','--login',]+args.command_to_run
+ exec_args = [arch, '/usr/bin/sudo', '-u', slice_name,
+ '/bin/sh', '--login', ]+args.command_to_run
# once we can drop f12, it would be nicer to instead go for
# exec_args = [arch,'/usr/sbin/capsh',cap_arg,'--user=%s'%slice_name,'--login',]+args.command_to_run
else:
- exec_args = [arch,'/bin/sh','--login']+args.command_to_run
+ exec_args = [arch, '/bin/sh', '--login']+args.command_to_run
os.environ['SHELL'] = '/bin/sh'
if os.path.exists('/etc/planetlab/lib/bind_public.so'):
os.environ['LD_PRELOAD'] = '/etc/planetlab/lib/bind_public.so'
if not args.noslicehome:
- os.environ['HOME'] = '/home/%s'%slice_name
- os.chdir("/home/%s"%(slice_name))
- if debug: print('lxcsu:execv:','/usr/bin/setarch',exec_args)
- os.execv('/usr/bin/setarch',exec_args)
+ os.environ['HOME'] = '/home/%s' % slice_name
+ os.chdir("/home/%s" % (slice_name))
+ if debug:
+ print('lxcsu:execv:', '/usr/bin/setarch', exec_args)
+ os.execv('/usr/bin/setarch', exec_args)
else:
setns.proc_umount()
- _,status = os.waitpid(fork_pid,0)
+ _, status = os.waitpid(fork_pid, 0)
exit(os.WEXITSTATUS(status))
+
if __name__ == '__main__':
- main()
+ main()
git://git.onelab.eu / lxc-userspace.git / blobdiff