-# $Id$
-# $URL$
-
"""A few things that didn't seem to fit anywhere else."""
import os, os.path
import errno
import threading
import subprocess
+import shutil
+import sys
+import signal
import logger
def write_file(filename, do_write, **kw_args):
"""Write file <filename> atomically by opening a temporary file, using <do_write> to write that file, and then renaming the temporary file."""
- os.rename(write_temp_file(do_write, **kw_args), filename)
+ shutil.move(write_temp_file(do_write, **kw_args), filename)
def write_temp_file(do_write, mode=None, uidgid=None):
fd, temporary_filename = tempfile.mkstemp()
os.close(fd)
if os.path.exists(target):
os.unlink(target)
- os.rename(name,target)
+ shutil.move(name,target)
if chmod: os.chmod(target,chmod)
return True
def release(self):
logger.log("tools: Lock released.", 2)
fcntl.lockf(self.fd, fcntl.LOCK_UN)
+
+####################
+# Utilities for getting the IP address of a LXC/Openvswitch slice. Do this by
+# running ifconfig inside of the slice's context.
+
+def get_sliver_process(slice_name, process_cmdline):
+ """ Utility function to find a process inside of an LXC sliver. Returns
+ (cgroup_fn, pid). cgroup_fn is the filename of the cgroup file for
+ the process, for example /proc/2592/cgroup. Pid is the process id of
+ 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()
+ except:
+ # 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:
+ break
+
+ if (not cgroup_fn) or (not pid):
+ logger.log("get_sliver_process: process %s not running in slice %s" % (process_cmdline, slice_name))
+ return (None, None)
+
+ return (cgroup_fn, pid)
+
+def get_sliver_ifconfig(slice_name, device="eth0"):
+ """ return the output of "ifconfig" run from inside the sliver.
+
+ 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")
+ import setns
+
+ (cgroup_fn, pid) = get_sliver_process(slice_name, "/sbin/init")
+ if (not cgroup_fn) or (not pid):
+ return None
+
+ path = '/proc/%s/ns/net'%pid
+
+ result = None
+ try:
+ setns.chcontext(path)
+
+ args = ["/sbin/ifconfig", device]
+ sub = subprocess.Popen(args, stderr = subprocess.PIPE, stdout = subprocess.PIPE)
+ sub.wait()
+
+ if (sub.returncode != 0):
+ logger.log("get_slice_ifconfig: error in ifconfig: %s" % sub.stderr.read())
+
+ result = sub.stdout.read()
+ finally:
+ setns.chcontext("/proc/1/ns/net")
+
+ return result
+
+def get_sliver_ip(slice_name):
+ ifconfig = get_sliver_ifconfig(slice_name)
+ if not ifconfig:
+ return None
+
+ for line in ifconfig.split("\n"):
+ if "inet addr:" in line:
+ # example: ' inet addr:192.168.122.189 Bcast:192.168.122.255 Mask:255.255.255.0'
+ parts = line.strip().split()
+ if len(parts)>=2 and parts[1].startswith("addr:"):
+ return parts[1].split(":")[1]
+
+ 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 ():
+ global _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)
git://git.onelab.eu / nodemanager.git / blobdiff