import subprocess
import shutil
import sys
+import signal
import logger
the process. If the process is not found then (None, None) is returned.
"""
try:
- cmd = 'grep %s /proc/*/cgroup | grep freezer'%slice_name
- output = os.popen(cmd).readlines()
+ cmd = 'grep %s /proc/*/cgroup | grep freezer'%slice_name
+ output = os.popen(cmd).readlines()
except:
- # the slice couldn't be found
- logger.log("get_sliver_process: couldn't find slice %s" % slice_name)
- return (None, None)
+ # the slice couldn't be found
+ logger.log("get_sliver_process: couldn't find slice %s" % slice_name)
+ return (None, None)
cgroup_fn = None
pid = None
for e in output:
- try:
- l = e.rstrip()
- path = l.split(':')[0]
- comp = l.rsplit(':')[-1]
- slice_name_check = comp.rsplit('/')[-1]
-
- if (slice_name_check == slice_name):
- slice_path = path
- pid = slice_path.split('/')[2]
- cmdline = open('/proc/%s/cmdline'%pid).read().rstrip('\n\x00')
- if (cmdline == process_cmdline):
- cgroup_fn = slice_path
- break
- except:
+ try:
+ l = e.rstrip()
+ path = l.split(':')[0]
+ comp = l.rsplit(':')[-1]
+ slice_name_check = comp.rsplit('/')[-1]
+
+ if (slice_name_check == slice_name):
+ slice_path = path
+ pid = slice_path.split('/')[2]
+ cmdline = open('/proc/%s/cmdline'%pid).read().rstrip('\n\x00')
+ if (cmdline == process_cmdline):
+ cgroup_fn = slice_path
break
+ except:
+ break
if (not cgroup_fn) or (not pid):
logger.log("get_sliver_process: process %s not running in slice %s" % (process_cmdline, slice_name))
side effects: adds "/usr/sbin" to sys.path
"""
+ # See if setns is installed. If it's not then we're probably not running
+ # LXC.
+ if not os.path.exists("/usr/sbin/setns.so"):
+ return None
+
# setns is part of lxcsu and is installed to /usr/sbin
if not "/usr/sbin" in sys.path:
sys.path.append("/usr/sbin")
return None
path = '/proc/%s/ns/net'%pid
- r3 = setns.chcontext(path)
result = None
try:
return None
+### this returns the kind of virtualization on the node
+# either 'vs' or 'lxc'
+# also caches it in /etc/planetlab/virt for next calls
+# could be promoted to core nm if need be
+virt_stamp="/etc/planetlab/virt"
+def get_node_virt ():
+ try:
+ return file(virt_stamp).read().strip()
+ except:
+ pass
+ logger.log("Computing virt..")
+ try:
+ if subprocess.call ([ 'vserver', '--help' ]) ==0: virt='vs'
+ else: virt='lxc'
+ except:
+ virt='lxc'
+ with file(virt_stamp,"w") as f:
+ f.write(virt)
+ return virt
+
+### this return True or False to indicate that systemctl is present on that box
+# cache result in memory as _has_systemctl
+_has_systemctl=None
+def has_systemctl ():
+ if _has_systemctl is None:
+ _has_systemctl = (subprocess.call([ 'systemctl', '--help' ]) == 0)
+ return _has_systemctl
+
+# how to run a command in a slice
+# now this is a painful matter
+# the problem is with capsh that forces a bash command to be injected in its exec'ed command
+# so because lxcsu uses capsh, you cannot exec anything else than bash
+# bottom line is, what actually needs to be called is
+# vs: vserver exec slicename command and its arguments
+# lxc: lxcsu slicename "command and its arguments"
+# which, OK, is no big deal as long as the command is simple enough,
+# but do not stretch it with arguments that have spaces or need quoting as that will become a nightmare
+def command_in_slice (slicename, argv):
+ virt=get_node_virt()
+ if virt=='vs':
+ return [ 'vserver', slicename, 'exec', ] + argv
+ elif virt=='lxc':
+ # wrap up argv in a single string for -c
+ return [ 'lxcsu', slicename, ] + [ " ".join(argv) ]
+ logger.log("command_in_slice: WARNING: could not find a valid virt")
+ return argv
+
+####################
+def init_signals ():
+ def handler (signum, frame):
+ logger.log("Received signal %d - exiting"%signum)
+ os._exit(1)
+ signal.signal(signal.SIGHUP,handler)
+ signal.signal(signal.SIGQUIT,handler)
+ signal.signal(signal.SIGINT,handler)
+ signal.signal(signal.SIGTERM,handler)