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lxc-checkconfig.py
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lxc-checkconfig.py
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#!/usr/bin/env python
import sys
import os
import platform
import re
import json
import gzip
import argparse
from collections import defaultdict
config = os.getenv('CONFIG', '/proc/config.gz')
COLORS = defaultdict(lambda :'\033[0;39m')
COLORS['enabled'] = '\033[1;32m'
COLORS['requred'] = '\033[1;31m'
COLORS['missing'] = '\033[1;33m'
# simplify error handling for argparse
class ArgParser(argparse.ArgumentParser):
def error(self, message):
sys.stderr.write('error: %s\n' % message)
self.print_help()
sys.exit(2)
def printerr(msg):
sys.stderr.write('%s\n' % msg)
def is_set(config_name):
if config.endswith('.gz'):
config_file = [ i.decode('utf-8') for i in gzip.open(config, 'r').readlines()]
else:
config_file = [ i for i in open(config, 'r').readlines()]
for line in config_file:
if re.match('%s=[y|m]' % config_name, line):
return True
def is_enabled(config_name, mandatory=None):
if is_set(config_name):
return 'enabled'
else:
if mandatory == True:
return 'required'
else:
return 'missing'
def get_cgroup_mount_path(search_for, search_where):
allmounts = open(search_where,'r')
for mount_line in allmounts:
if mount_line.strip().split(' ')[2].startswith(search_for):
return mount_line.split(' ')[1]
return ''
def print_config(config_dict):
print_groups = {
'Namespaces' : [ 'Namespaces','Utsname namespace','Ipc namespace','Pid namespace',
'User namespace','Network namespace','Multiple /dev/pts instances'],
'Control groups' : ['Cgroup', 'Cgroup clone_children flag', 'Cgroup namespace',
'Cgroup device', 'Cgroup sched', 'Cgroup cpu account', 'Cgroup memory controller',
'Cgroup cpuset'],
'Misc' : ['Veth pair device', 'Macvlan', 'Vlan', 'File capabilities']
}
groups_order = ['Namespaces', 'Control groups', 'Misc']
normal = COLORS['normal']
if config != config_orig:
print('Kernel configuration not found at %s; searching...' % config_orig)
if not os.path.isfile(config):
script_name = os.path.basename(__file__)
printerr('%s: unable to retrieve kernel configuration' % script_name)
printerr('Try recompiling with IKCONFIG_PROC, installing the kernel headers,')
printerr('or specifying the kernel configuration path with:')
printerr(' CONFIG=<path> %s' % script_name)
sys.exit(1)
else:
print('Kernel configuration found at %s' % config)
for name in groups_order:
print('--- %s ---' % name)
for field in print_groups[name]:
if field not in config_dict :
continue
color = COLORS[config_dict[field].lower()]
print('%s: %s%s%s' % (field, color, config_dict[field], normal) )
print('')
print('Note : Before booting a new kernel, you can check its configuration')
print('usage : CONFIG=/path/to/config /usr/bin/lxc-checkconfig\n')
####################################
## BASH CODE NEED HELP TO CONVERT ##
####################################
# print_cgroups() {
# # print all mountpoints for cgroup filesystems
# awk '$1 !~ /#/ && $3 == mp { print $2; } ; END { exit(0); } ' "mp=$1" "$2" ;
# }
## DONE ## CGROUP_MNT_PATH=`print_cgroups cgroup /proc/self/mounts | head -n 1`
# KVER_MAJOR=$($GREP '^# Linux.*Kernel Configuration' $CONFIG | \
# sed -r 's/.* ([0-9])\.[0-9]{1,2}\.[0-9]{1,3}.*/\1/')
# if [ "$KVER_MAJOR" = "2" ]; then
# KVER_MINOR=$($GREP '^# Linux.*Kernel Configuration' $CONFIG | \
# sed -r 's/.* 2.6.([0-9]{2}).*/\1/')
# else
# KVER_MINOR=$($GREP '^# Linux.*Kernel Configuration' $CONFIG | \
# sed -r 's/.* [0-9]\.([0-9]{1,3})\.[0-9]{1,3}.*/\1/')
# fi
####################################
####################################
cgroup_mnt_path = get_cgroup_mount_path('cgroup','/proc/self/mounts')
kver = platform.uname()[2]
kver_split = kver.split('.')
kver_major = int(kver_split[0])
kver_minor = int(kver_split[1])
if not os.path.isfile(config):
config_orig = config
headers_config = '/lib/modules/%s/build/.config' % kver
boot_config = '/boot/config-%s' % kver
if os.path.isfile(headers_config):
config = headers_config
if os.path.isfile(boot_config):
config = boot_config
# Define dict type
config_dict = {}
if os.path.isfile(config):
# Namespaces
config_dict['Namespaces'] = is_enabled('CONFIG_NAMESPACES', True)
config_dict['Utsname namespace'] = is_enabled('CONFIG_UTS_NS')
config_dict['Ipc namespace'] = is_enabled('CONFIG_IPC_NS', True)
config_dict['Pid namespace'] = is_enabled('CONFIG_PID_NS', True)
config_dict['User namespace'] = is_enabled('CONFIG_USER_NS')
config_dict['Network namespace'] = is_enabled('CONFIG_NET_NS')
config_dict['Multiple /dev/pts instances'] = is_enabled('CONFIG_DEVPTS_MULTIPLE_INSTANCES')
# Control groups
config_dict['Cgroup'] = is_enabled('CONFIG_CGROUPS', True)
if os.path.isfile('%s/cgroup.clone_children' % cgroup_mnt_path):
config_dict['Cgroup clone_children flag'] = 'enabled'
else:
config_dict['Cgroup namespace'] = is_enabled('CONFIG_CGROUP_NS', True)
config_dict['Cgroup device'] = is_enabled('CONFIG_CGROUP_DEVICE')
config_dict['Cgroup sched'] = is_enabled('CONFIG_CGROUP_SCHED')
config_dict['Cgroup cpu account'] = is_enabled('CONFIG_CGROUP_CPUACCT')
if kver_major >= 3 and kver_minor >= 6:
config_dict['Cgroup memory controller'] = is_enabled('CONFIG_MEMCG')
else:
config_dict['Cgroup memory controller'] = is_enabled('CONFIG_CGROUP_MEM_RES_CTLR')
if is_set('CONFIG_SMP'):
config_dict['Cgroup cpuset'] = is_enabled('CONFIG_CPUSETS')
# Misc
config_dict['Veth pair device'] = is_enabled('CONFIG_VETH')
config_dict['Macvlan'] = is_enabled('CONFIG_MACVLAN')
config_dict['Vlan'] = is_enabled('CONFIG_VLAN_8021Q')
if kver_major == 2 and kver_minor < 33:
config_dict['File capabilities'] = is_enabled('CONFIG_SECURITY_FILE_CAPABILITIES')
if (kver_major == 2 and kver_minor > 32) or kver_major > 2:
config_dict['File capabilities'] = 'enabled'
if __name__ == '__main__':
parser = ArgParser(description='Set network for a new container')
parser.add_argument('-j','--json', help='output in JSON format', action='store_true')
args = vars(parser.parse_args())
if args['json']:
if not os.path.isfile(config):
config_dict['error'] = 'unable to retrieve kernel configuration'
print(json.dumps(config_dict, sort_keys=True, indent=4, separators=(',', ': ')))
else:
print_config(config_dict)