- # 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)]
-
- # 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 = '/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 child_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
- # they chould 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
- # xxx probably init_pid here too
- arch = getarch('/proc/%s/exe'%driver_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,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,e:
- if (not subdirs.has_key(subsystem)):
- 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"
- exit(1)
-
- fork_pid = os.fork()
-
- def getuid (slicename):
- import pwd
- try:
- return pwd.getpwnam(slicename).pw_uid
- except:
- return
-
- if (fork_pid == 0):
- if (not args.root):
- 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
- else:
- # let's keep this check even though we don't use the uid
- # as a way of checking the existence of the slice account
- uid = getuid (slice_name)
- if not uid:
- 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
+ # 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)]
+
+ # 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 = '/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 child_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
+ # they chould be changed as well
+
+ except Exception:
+ 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)
+ arch = getarch('/proc/%s/exe' % driver_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 entry in entries:
+ prefix = 'vsys_sysctl.'
+ if entry.startswith(prefix):
+ sysctl_file = '/'.join([sysctl_dir, entry])
+ sysctl_name = entry[len(prefix):]
+ with open(sysctl_file) as feed:
+ sysctl_val = feed.read()
+ sysctls.append((sysctl_file, sysctl_name, sysctl_val))
+
+ 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
+ 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:
+ pass
+
+ tasks_path = [sysfs_root, subsystem, subdirs[subsystem], 'tasks']
+ tasks_path_str = '/'.join(tasks_path)
+
+ try:
+ feed = open(tasks_path_str, 'w')
+ except Exception:
+ tasks_path_alt_str = '/'.join(tasks_path_alt)
+ feed = open(tasks_path_alt_str, 'w')
+
+ feed.write(str(os.getpid()))
+ if subsystem == 'freezer':
+ feed.close()
+
+ except Exception as exc:
+ if subsystem not in subdirs:
+ pass
+ else:
+ if DEBUG:
+ print(exc)
+ 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')
+
+ if not os.access('/proc/self', 0):
+ setns.proc_mount()
+
+ for (sysctl_file, sysctl_name, sysctl_val) in sysctls:
+ for binary in ["/sbin/sysctl", "/usr/sbin/sysctl", "/bin/sysctl", "/usr/bin/sysctl"]:
+ if os.path.exists(binary):
+ os.system('%s -w %s=%s >/dev/null 2>&1' %
+ (binary, 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
+
+ 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)
+ # 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")
+ exit(1)
+
+ fork_pid = os.fork()
+
+ def getuid(slicename):
+ import pwd
+ try:
+ return pwd.getpwnam(slicename).pw_uid
+ except Exception:
+ return
+
+ if fork_pid == 0:
+ if not args.root:
+ 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
+ else:
+ # let's keep this check even though we don't use the uid
+ # as a way of checking the existence of the slice account
+ uid = getuid(slice_name)
+ if not uid:
+ 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