import sys
import os
import setns
-import pdb
+import pwd
from argparse import ArgumentParser
# can set to True here, but also use the -d option
debug = False
-def getarch(f):
- output = os.popen('readelf -h %s 2>&1'%f).readlines()
+def getarch(pid):
+ 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')
+ raise Exception('Could not determine architecture for pid %s'%pid)
def get_cgroup_subdirs_for_pid(pid):
cgroup_info_file = '/proc/%s/cgroup'%pid
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 args.debug:
+ global debug
+ 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
+ # even though we don't use the slice_uid any more, this is still
+ # checked later on as a means to ensure existence of the slice account
+ try:
+ slice_uid = pwd.getpwnam(slice_name).pw_uid
+ except Exception, e:
+ if debug:
+ import traceback
+ print 'error while computing slice_uid',e
+ traceback.print_exc()
+ 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 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
# 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
+ # 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
- # they chould be changed as well
+ # some should be changed as well
except:
print "Domain %s not found"%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)
+ # 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 = []
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()
# 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:
+ if not slice_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