import setns
import os
-import sys
from argparse import ArgumentParser
parser.add_argument ("slice_name")
parser.add_argument ("command_to_run",nargs="*")
- options = parser.parse_args()
- slice_name=options.slice_name
+ args = parser.parse_args()
+ slice_name=args.slice_name
# support for either setting debug at the top of this file, or on the command-line
- if options.debug:
+ if args.debug:
global debug
debug=True
slice_path = path
pid = slice_path.split('/')[2]
cmdline = open('/proc/%s/cmdline'%pid).read().rstrip('\n\x00')
- if (cmdline == '/sbin/init'):
+ if (cmdline == '/sbin/init') or (cmdline.startswith("init [")):
slice_spec = slice_path
arch = getarch('/proc/%s/exe'%pid)
break
setns.chcontext('/proc/%s/ns/uts'%pid)
setns.chcontext('/proc/%s/ns/ipc'%pid)
+
+ if (not args.pidns):
+ setns.chcontext('/proc/%s/ns/pid'%pid)
- if (not options.netns):
+ if (not args.netns):
setns.chcontext('/proc/%s/ns/net'%pid)
- if (not options.mntns):
+ if (not args.mntns):
setns.chcontext('/proc/%s/ns/mnt'%pid)
- if (not options.pidns):
- setns.chcontext('/proc/%s/ns/pid'%pid)
+
+ proc_mounted = False
if (not os.access('/proc/self',0)):
+ proc_mounted = True
setns.proc_mount()
+
+
# cgroups is not yet LXC-safe, so we need to use the course grained access control
# strategy of unmounting the filesystem
pid = os.fork()
+ # capsh has a --user option starting with f14
+ # so if only for f12 we need to fake this one
+ #
+ # capsh.c does essentially the following when invoked with --user:
+ # pwd = getpwnam(user); ...
+ # ngroups = MAX_GROUPS;
+ # status = getgrouplist(user, pwd->pw_gid, groups, &ngroups); ...
+ # status = setgroups(ngroups, groups); ...
+ # status = setgid(pwd->pw_gid); ...
+ # status = setuid(pwd->pw_uid); ...
+ # however we cannot simulate that ourselves because if we did in this process then
+ # capsh could not be allowed to mess with caps any more
+
+ def getuid (slicename):
+ import pwd
+ try:
+ return pwd.getpwnam(slicename).pw_uid
+ except:
+ return
+
if (pid == 0):
cap_arg = '--drop='+drop_capabilities
- if (not options.root):
- exec_args = [arch,'/usr/sbin/capsh',cap_arg,'--','--login']+options.command_to_run
-# Thierry's suggestion:exec_args = [arch,'/usr/sbin/capsh',cap_arg,'--user=%s'%slice_name,'--','--login',]+options.command_to_run
+ if (not args.root):
+ uid = getuid (slice_name)
+ if not uid:
+ print "lxcsu-internal could not spot %s in /etc/passwd - exiting"%slice_name
+ exit(1)
+ exec_args = [arch,'/usr/sbin/capsh',cap_arg,'--uid=%s'%uid,'--','--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,'/usr/sbin/capsh','--','--login']+options.command_to_run
+ exec_args = [arch,'/usr/sbin/capsh','--','--login']+args.command_to_run
os.environ['SHELL'] = '/bin/sh'
-# Thierry's suggestion:os.environ['HOME'] = '/home/%s'%slice_name
+ os.environ['HOME'] = '/home/%s'%slice_name
+ os.environ['LD_PRELOAD'] = '/etc/planetlab/lib/bind_public.so'
+ os.chdir("/home/%s"%(slice_name))
if debug: print 'lxcsu-internal:execv:','/usr/bin/setarch',exec_args
os.execv('/usr/bin/setarch',exec_args)
else:
+ setns.proc_umount()
_,status = os.waitpid(pid,0)
exit(os.WEXITSTATUS(status))