+# -*- python-indent: 4 -*-
+
"""A few things that didn't seem to fit anywhere else."""
import os, os.path
import sys
import signal
-###################################################
-# Added by Guilherme Sperb Machado <gsm@machados.org>
-###################################################
-
-import re
-import socket
-import fileinput
-
-# 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 -- which is required here.")
-###################################################
-
import logger
PID_FILE = '/var/run/nodemanager.pid'
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:
####################
# manage files
def pid_file():
- """We use a pid file to ensure that only one copy of NM is running at a given time.
+ """
+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."""
+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."""
+ """
+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):
finally: f.close()
return temporary_filename
-# replace a target file with a new contents - checks for changes
-# 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
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:
if chmod: os.chmod(target,chmod)
return True
-
####################
# utilities functions to get (cached) information from the node
# 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.
+ """
+ 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
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
return (cgroup_fn, pid)
###################################################
-# Author: Guilherme Sperb Machado <gsm@machados.org>
-###################################################
-# Basically this method is just a copy from "get_process()", just
-# adding one more split() to correctly parse the processes for LXC.
-# Only for LXC!
-# TODO: maybe merge both methods, and put the type as an argument, if
-# it is LXC or vserver
+# Added by Guilherme Sperb Machado <gsm@machados.org>
###################################################
-def get_sliver_process_lxc(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()
- #logger.log("tools: l=%s" % (l) )
- path = l.split(':')[0]
- #logger.log("tools: path=%s" % (path) )
- comp = l.rsplit(':')[-1]
- #logger.log("tools: comp=%s" % (comp) )
- slice_name_check1 = comp.rsplit('/')[-1]
- #logger.log("tools: slice_name_check1=%s" % (slice_name_check1) )
- slice_name_check2 = slice_name_check1.rsplit('.')[0]
- #logger.log("tools: slice_name_check2=%s" % (slice_name_check2) )
-
- if (slice_name_check2 == slice_name):
- slice_path = path
- pid = slice_path.split('/')[2]
- #logger.log("tools: pid=%s" % (pid) )
- cmdline = open('/proc/%s/cmdline'%pid).read().rstrip('\n\x00')
- #logger.log("tools: cmdline=%s" % (cmdline) )
- #logger.log("tools: process_cmdline=%s" % (process_cmdline) )
- if (cmdline == process_cmdline):
- cgroup_fn = slice_path
- break
- except:
- #logger.log("tools: break!")
- 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)
+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.
+ """
+ return the output of "ifconfig" run from inside the sliver.
- side effects: adds "/usr/sbin" to sys.path
+ side effects: adds "/usr/sbin" to sys.path
"""
# See if setns is installed. If it's not then we're probably not running
return result
-###################################################
-# Author: Guilherme Sperb Machado <gsm@machados.org>
-###################################################
-# Basically this method is just a copy from "get_sliver_ifconfig()", but,
-# instead, calls the "get_sliver_process_lxc()" method.
-# Only for LXC!
-# TODO: maybe merge both methods, and put the type as an argument, if
-# it is LXC or vserver
-###################################################
-def get_sliver_ifconfig_lxc(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_lxc(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:
# Only for LXC!
###################################################
def get_sliver_ipv6(slice_name):
- ifconfig = get_sliver_ifconfig_lxc(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)
+ 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 isValidIPv6(ipv6addr):
- try:
- socket.inet_pton(socket.AF_INET6, ipv6addr)
- except socket.error:
- return False
- return True
+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'
except:
pass
logger.log("Computing virt..")
- try:
+ try:
if subprocess.call ([ 'vserver', '--help' ]) ==0: virt='vs'
- else: virt='lxc'
+ else: virt='lxc'
except:
virt='lxc'
with file(virt_stamp,"w") as f:
# This method was developed to support the ipv6 plugin
# Only for LXC!
###################################################
-def reboot_sliver(name):
- type = 'sliver.LXC'
- # connecting to the libvirtd
- connLibvirt = Sliver_Libvirt.getConnection(type)
- domains = connLibvirt.listAllDomains()
- for domain in domains:
- #ret = dir(domain)
- #for method in ret:
- # logger.log("ipv6: " + repr(method))
- #logger.log("tools: " + str(domain.name()) )
- try:
- domain.destroy()
- logger.log("tools: %s destroyed" % (domain.name()) )
- domain.create()
- logger.log("tools: %s created" % (domain.name()) )
- except:
- logger.log("tools: %s could not be rebooted" % (domain.name()) )
+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>
###################################################
def get_hosts_file_path(slicename):
containerDir = os.path.join(sliver_lxc.Sliver_LXC.CON_BASE_DIR, slicename)
- logger.log("tools: %s" % (containerDir) )
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
+# 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 re.search(r'%s' % (ipv6addr), line):
- found=True
- fileinput.close()
- return found
+ 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+.*$', line)
+ if search:
+ ipv6candidate = search.group(1)
+ ipv6candidatestrip = ipv6candidate.strip()
+ valid = is_valid_ipv6(ipv6candidatestrip)
+ if valid:
+ found=True
+ fileinput.close()
+ return found
except:
- logger.log("tools: error when finding ipv6 address %s in the /etc/hosts file of slice=%s" % (ipv6addr, slicename) )
+ logger.log("tools: FAILED to search %s in /etc/hosts file of slice=%s" % \
+ (ipv6addr, slicename) )
###################################################
# Author: Guilherme Sperb Machado <gsm@machados.org>
###################################################
-# Removes all ipv6 addresses from the /etc/hosts file of a given slice
+# Removes all ipv6 addresses from the /etc/hosts
+# file of a given slice
###################################################
def remove_all_ipv6addr_hosts(slicename, node):
hostsFilePath = get_hosts_file_path(slicename)
try:
- for line in fileinput.input(r'%s' % (hostsFilePath), inplace=True):
- logger.log("tools: line=%s" % (line) )
- search = re.search(r'^(.*)\s+(%s|%s)$' % (node,'localhost'), line)
- if search:
- ipv6candidate = search.group(1)
- ipv6candidatestrip = ipv6candidate.strip()
- logger.log("tools: group1=%s" % (ipv6candidatestrip) )
- valid = isValidIPv6(ipv6candidatestrip)
- if not valid:
- logger.log("tools: address=%s not valid" % (ipv6candidatestrip) )
- print line,
- fileinput.close()
+ 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: could not delete the ipv6 address from the hosts file of slice=%s" % (slicename) )
+ logger.log("tools: FAILED to remove the IPv6 address from /etc/hosts file of slice=%s" % \
+ (slicename) )
###################################################
# Author: Guilherme Sperb Machado <gsm@machados.org>
#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:
- # debugging purposes only:
- #file.write(string)
- file.write(ipv6addr + " " + node + "\n")
- file.close()
+ 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: could not add the IPv6 address to the hosts file of slice=%s" % (slicename) )
+ logger.log("tools: FAILED to add the IPv6 address to /etc/hosts file of slice=%s" % \
+ (slicename) )
# 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,
+# 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()
git://git.onelab.eu / nodemanager.git / blobdiff