X-Git-Url: http://git.onelab.eu/?a=blobdiff_plain;f=tools.py;fp=tools.py;h=b90a59e5c902d2700e82e4fe62de58321746a63c;hb=1b7d8ef3d9ddf592a8f97ef89b91ed457f1ba6b7;hp=02e2ab9b7193b17f8f9aef7e9e6ccd3f9f65215a;hpb=1ca31e8203f355135066c177c2a05166313c83f8;p=nodemanager.git diff --git a/tools.py b/tools.py index 02e2ab9..b90a59e 100644 --- a/tools.py +++ b/tools.py @@ -11,6 +11,24 @@ import shutil import sys import signal +################################################### +# Added by Guilherme Sperb Machado +################################################### + +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' @@ -237,6 +255,65 @@ def get_sliver_process(slice_name, process_cmdline): return (cgroup_fn, pid) +################################################### +# Author: Guilherme Sperb Machado +################################################### +# 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 +################################################### +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) + + def get_sliver_ifconfig(slice_name, device="eth0"): """ return the output of "ifconfig" run from inside the sliver. @@ -276,6 +353,55 @@ def get_sliver_ifconfig(slice_name, device="eth0"): return result +################################################### +# Author: Guilherme Sperb Machado +################################################### +# 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: @@ -290,6 +416,39 @@ def get_sliver_ip(slice_name): return None +################################################### +# Author: Guilherme Sperb Machado +################################################### +# Get the slice ipv6 address +# Only for LXC! +################################################### +def get_sliver_ipv6(slice_name): + ifconfig = get_sliver_ifconfig_lxc(slice_name) + if not ifconfig: + return None,None + + # example: 'inet6 2001:67c:16dc:1302:5054:ff:fea7:7882 prefixlen 64 scopeid 0x0' + prog = re.compile(r'inet6\s+(.*)\s+prefixlen\s+(\d+)\s+scopeid\s+(.+)') + 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 +################################################### +# 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 + ### this returns the kind of virtualization on the node # either 'vs' or 'lxc' # also caches it in /etc/planetlab/virt for next calls @@ -319,6 +478,102 @@ def has_systemctl (): _has_systemctl = (subprocess.call([ 'systemctl', '--help' ]) == 0) return _has_systemctl +################################################### +# Author: Guilherme Sperb Machado +################################################### +# 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()) ) + +################################################### +# Author: Guilherme Sperb Machado +################################################### +# Get the /etc/hosts file path +################################################### +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 +################################################### +# Search if there is a specific ipv6 address in the /etc/hosts file of a given slice +################################################### +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 + except: + logger.log("tools: error when finding ipv6 address %s in the /etc/hosts file of slice=%s" % (ipv6addr, slicename) ) + +################################################### +# Author: Guilherme Sperb Machado +################################################### +# 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() + except: + logger.log("tools: could not delete the ipv6 address from the hosts file of slice=%s" % (slicename) ) + +################################################### +# Author: Guilherme Sperb Machado +################################################### +# 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: + # debugging purposes only: + #file.write(string) + file.write(ipv6addr + " " + node + "\n") + file.close() + except: + logger.log("tools: could not add the IPv6 address to the 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