+# -*- python-indent: 4 -*-
+
"""A few things that didn't seem to fit anywhere else."""
-import cPickle
-import errno
-import os
+import os, os.path
import pwd
import tempfile
-import threading
import fcntl
-import commands
+import errno
+import threading
+import subprocess
+import shutil
+import sys
+import signal
+
import logger
-PID_FILE = '/var/run/nm.pid'
+PID_FILE = '/var/run/nodemanager.pid'
+####################
def get_default_if():
interface = get_if_from_hwaddr(get_hwaddr_from_plnode())
if not interface: interface = "eth0"
if dev_hwaddr == hwaddr: return dev
return None
+####################
+# daemonizing
def as_daemon_thread(run):
"""Call function <run> with no arguments in its own thread."""
thr = threading.Thread(target=run)
os.setsid()
if os.fork() != 0: os._exit(0)
os.chdir('/')
- os.umask(0)
+ os.umask(0022)
devnull = os.open(os.devnull, os.O_RDWR)
os.dup2(devnull, 0)
# xxx fixme - this is just to make sure that nothing gets stupidly lost - should use devnull
- crashlog = os.open('/var/log/nm.daemon', os.O_RDWR | os.O_APPEND | os.O_CREAT, 0644)
+ crashlog = os.open('/var/log/nodemanager.daemon', os.O_RDWR | os.O_APPEND | os.O_CREAT, 0644)
os.dup2(crashlog, 1)
os.dup2(crashlog, 2)
def fork_as(su, function, *args):
- """fork(), cd / to avoid keeping unused directories open, close all nonstandard file descriptors (to avoid capturing open sockets), fork() again (to avoid zombies) and call <function> with arguments <args> in the grandchild process. If <su> is not None, set our group and user ids appropriately in the child process."""
+ """
+fork(), cd / to avoid keeping unused directories open,
+close all nonstandard file descriptors (to avoid capturing open sockets),
+fork() again (to avoid zombies) and call <function>
+with arguments <args> in the grandchild process.
+If <su> is not None, set our group and user ids
+ appropriately in the child process.
+ """
child_pid = os.fork()
if child_pid == 0:
try:
except:
os.seteuid(os.getuid()) # undo su so we can write the log file
os.setegid(os.getgid())
- logger.log_exc()
+ logger.log_exc("tools: fork_as")
os._exit(0)
else: os.waitpid(child_pid, 0)
+####################
+# manage files
def pid_file():
- """We use a pid file to ensure that only one copy of NM is running at a given time. If successful, this function will write a pid file containing the pid of the current process. The return value is the pid of the other running process, or None otherwise."""
+ """
+We use a pid file to ensure that only one copy of NM is running at a given time.
+If successful, this function will write a pid file containing the pid of the current process.
+The return value is the pid of the other running process, or None otherwise.
+ """
other_pid = None
if os.access(PID_FILE, os.F_OK): # check for a pid file
handle = open(PID_FILE) # pid file exists, read it
return other_pid
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)
+ """
+Write file <filename> atomically by opening a temporary file,
+using <do_write> to write that file, and then renaming the temporary file.
+ """
+ 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()
finally: f.close()
return temporary_filename
+def replace_file_with_string (target, new_contents, chmod=None, remove_if_empty=False):
+ """
+Replace a target file with a new contents
+checks for changes: does not do anything if previous state was already right
+can handle chmod if requested
+can also remove resulting file if contents are void, if requested
+performs atomically:
+writes in a tmp file, which is then renamed (from sliverauth originally)
+returns True if a change occurred, or the file is deleted
+ """
+ try:
+ current=file(target).read()
+ except:
+ current=""
+ if current==new_contents:
+ # if turns out to be an empty string, and remove_if_empty is set,
+ # then make sure to trash the file if it exists
+ if remove_if_empty and not new_contents and os.path.isfile(target):
+ logger.verbose("tools.replace_file_with_string: removing file %s"%target)
+ try: os.unlink(target)
+ finally: return True
+ return False
+ # overwrite target file: create a temp in the same directory
+ path=os.path.dirname(target) or '.'
+ fd, name = tempfile.mkstemp('','repl',path)
+ os.write(fd,new_contents)
+ os.close(fd)
+ if os.path.exists(target):
+ os.unlink(target)
+ shutil.move(name,target)
+ if chmod: os.chmod(target,chmod)
+ return True
+
+####################
# utilities functions to get (cached) information from the node
# get node_id from /etc/planetlab/node_id and cache it
_node_id=""
return _node_id
-# get slicefamily from /etc/planetlab/slicefamily and cache it
-# http://svn.planet-lab.org/wiki/SliceFamily
-_slicefamily=None
-def slicefamily():
- global _slicefamily
- if _slicefamily is None:
- try:
- _slicefamily=file("/etc/planetlab/slicefamily").read().strip()
- except:
- _slicefamily=""
- return _slicefamily
-
_root_context_arch=None
def root_context_arch():
global _root_context_arch
if not _root_context_arch:
- _root_context_arch=commands.getoutput("uname -i")
+ sp=subprocess.Popen(["uname","-i"],stdout=subprocess.PIPE)
+ (_root_context_arch,_)=sp.communicate()
+ _root_context_arch=_root_context_arch.strip()
return _root_context_arch
+####################
class NMLock:
def __init__(self, file):
- logger.log("Lock %s initialized." % file, 2)
+ logger.log("tools: Lock %s initialized." % file, 2)
self.fd = os.open(file, os.O_RDWR|os.O_CREAT, 0600)
flags = fcntl.fcntl(self.fd, fcntl.F_GETFD)
flags |= fcntl.FD_CLOEXEC
def __del__(self):
os.close(self.fd)
def acquire(self):
- logger.log("Lock acquired.", 2)
+ logger.log("tools: Lock acquired.", 2)
fcntl.lockf(self.fd, fcntl.LOCK_SH)
def release(self):
- logger.log("Lock released.", 2)
+ 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]
+ # the lines below were added by Guilherme <gsm@machados.org>
+ # due to the ipv6 plugin requirements (LXC)
+ virt=get_node_virt()
+ if virt=='lxc':
+ slice_name_check = slice_name_check.rsplit('.')[0]
+
+ 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)
+
+###################################################
+# Added by Guilherme Sperb Machado <gsm@machados.org>
+###################################################
+
+try:
+ import re
+ import socket
+ import fileinput
+except:
+ logger.log("Could not import 're', 'socket', or 'fileinput' python packages.")
+
+# TODO: is there anything better to do if the "libvirt", "sliver_libvirt",
+# and "sliver_lxc" are not in place?
+try:
+ import libvirt
+ from sliver_libvirt import Sliver_Libvirt
+ import sliver_lxc
+except:
+ logger.log("Could not import 'sliver_lxc' or 'libvirt' or 'sliver_libvirt'.")
+###################################################
+
+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
+
+###################################################
+# Author: Guilherme Sperb Machado <gsm@machados.org>
+###################################################
+# Get the slice ipv6 address
+# Only for LXC!
+###################################################
+def get_sliver_ipv6(slice_name):
+ ifconfig = get_sliver_ifconfig(slice_name)
+ if not ifconfig:
+ return None,None
+
+ # example: 'inet6 2001:67c:16dc:1302:5054:ff:fea7:7882 prefixlen 64 scopeid 0x0<global>'
+ prog = re.compile(r'inet6\s+(.*)\s+prefixlen\s+(\d+)\s+scopeid\s+(.+)<global>')
+ for line in ifconfig.split("\n"):
+ search = prog.search(line)
+ if search:
+ ipv6addr = search.group(1)
+ prefixlen = search.group(2)
+ return (ipv6addr,prefixlen)
+ return None,None
+
+###################################################
+# Author: Guilherme Sperb Machado <gsm@machados.org>
+###################################################
+# Check if the address is a AF_INET6 family address
+###################################################
+def is_valid_ipv6(ipv6addr):
+ try:
+ socket.inet_pton(socket.AF_INET6, ipv6addr)
+ except socket.error:
+ return False
+ return True
+
+### 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
+
+###################################################
+# Author: Guilherme Sperb Machado <gsm@machados.org>
+###################################################
+# This method was developed to support the ipv6 plugin
+# Only for LXC!
+###################################################
+def reboot_slivers():
+ type = 'sliver.LXC'
+ # connecting to the libvirtd
+ connLibvirt = Sliver_Libvirt.getConnection(type)
+ domains = connLibvirt.listAllDomains()
+ for domain in domains:
+ try:
+ domain.destroy()
+ logger.log("tools: DESTROYED %s" % (domain.name()) )
+ domain.create()
+ logger.log("tools: CREATED %s" % (domain.name()) )
+ except:
+ logger.log("tools: FAILED to reboot %s" % (domain.name()) )
+
+###################################################
+# Author: Guilherme Sperb Machado <gsm@machados.org>
+###################################################
+# Get the /etc/hosts file path
+###################################################
+def get_hosts_file_path(slicename):
+ containerDir = os.path.join(sliver_lxc.Sliver_LXC.CON_BASE_DIR, slicename)
+ return os.path.join(containerDir, 'etc', 'hosts')
+
+###################################################
+# Author: Guilherme Sperb Machado <gsm@machados.org>
+###################################################
+# Search if there is a specific ipv6 address in the
+# /etc/hosts file of a given slice
+# If the parameter 'ipv6addr' is None, then search
+# for any ipv6 address
+###################################################
+def search_ipv6addr_hosts(slicename, ipv6addr):
+ hostsFilePath = get_hosts_file_path(slicename)
+ found=False
+ try:
+ for line in fileinput.input(r'%s' % (hostsFilePath)):
+ if ipv6addr is not None:
+ if re.search(r'%s' % (ipv6addr), line):
+ found=True
+ else:
+ search = re.search(r'^(.*)\s+.*$', line)
+ if search:
+ ipv6candidate = search.group(1)
+ ipv6candidatestrip = ipv6candidate.strip()
+ valid = is_valid_ipv6(ipv6candidatestrip)
+ if valid:
+ found=True
+ fileinput.close()
+ return found
+ except:
+ logger.log("tools: FAILED to search %s in /etc/hosts file of slice=%s" % \
+ (ipv6addr, slicename) )
+
+###################################################
+# Author: Guilherme Sperb Machado <gsm@machados.org>
+###################################################
+# Removes all ipv6 addresses from the /etc/hosts
+# file of a given slice
+###################################################
+def remove_all_ipv6addr_hosts(slicename, node):
+ hostsFilePath = get_hosts_file_path(slicename)
+ try:
+ for line in fileinput.input(r'%s' % (hostsFilePath), inplace=True):
+ search = re.search(r'^(.*)\s+(%s|%s)$' % (node,'localhost'), line)
+ if search:
+ ipv6candidate = search.group(1)
+ ipv6candidatestrip = ipv6candidate.strip()
+ valid = is_valid_ipv6(ipv6candidatestrip)
+ if not valid:
+ print line,
+ fileinput.close()
+ logger.log("tools: REMOVED IPv6 address from /etc/hosts file of slice=%s" % \
+ (slicename) )
+ except:
+ logger.log("tools: FAILED to remove the IPv6 address from /etc/hosts file of slice=%s" % \
+ (slicename) )
+
+###################################################
+# Author: Guilherme Sperb Machado <gsm@machados.org>
+###################################################
+# Adds an ipv6 address to the /etc/hosts file within a slice
+###################################################
+def add_ipv6addr_hosts_line(slicename, node, ipv6addr):
+ hostsFilePath = get_hosts_file_path(slicename)
+ logger.log("tools: %s" % (hostsFilePath) )
+ # debugging purposes:
+ #string = "127.0.0.1\tlocalhost\n192.168.100.179\tmyplc-node1-vm.mgmt.local\n"
+ #string = "127.0.0.1\tlocalhost\n"
+ try:
+ with open(hostsFilePath, "a") as file:
+ file.write(ipv6addr + " " + node + "\n")
+ file.close()
+ logger.log("tools: ADDED IPv6 address to /etc/hosts file of slice=%s" % \
+ (slicename) )
+ except:
+ logger.log("tools: FAILED to add the IPv6 address to /etc/hosts file of slice=%s" % \
+ (slicename) )
+
+
+
+# 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