"""This class wraps LXC commands"""

SHELL = '/usr/sbin/vsh'

TYPE = 'sliver.LXC'

# Need to add a tag at myplc to actually use this account

# type = 'sliver.LXC'

REF_IMG_BASE_DIR = '/vservers/.lvref'

CON_BASE_DIR = '/vservers'

def __init__(self, rec):

name = rec['name']

Sliver_Libvirt.__init__(self, rec)

Initscript.__init__(self, name)

def configure(self, rec):

logger.log('========== sliver_lxc.configure {}'.format(self.name))

Sliver_Libvirt.configure(self, rec)

# in case we update nodemanager..

self.install_and_enable_vinit()

# do the configure part from Initscript

Initscript.configure(self, rec)

# remember configure() always gets called *before* start()

# in particular the slice initscript

# is expected to be in place already at this point

def start(self, delay=0):

logger.log('==================== sliver_lxc.start {}'.format(self.name))

if 'enabled' in self.rspec and self.rspec['enabled'] <= 0:

logger.log('sliver_lxc: not starting {}, is not enabled'.format(self.name))

return

# the generic /etc/init.d/vinit script is permanently refreshed, and enabled

self.install_and_enable_vinit()

# expose .ssh for omf_friendly slivers

if 'tags' in self.rspec and 'omf_control' in self.rspec['tags']:

Account.mount_ssh_dir(self.name)

# logger.log("NM is exiting for debug - just about to start {}".format(self.name))

# exit(0)

Sliver_Libvirt.start(self, delay)

def rerun_slice_vinit(self):

"""This is called at startup, and whenever the initscript code changes"""

logger.log("sliver_lxc.rerun_slice_vinit {}".format(self.name))

plain = "virsh -c lxc:/// lxc-enter-namespace --noseclabel -- {} /usr/bin/systemctl --system daemon-reload"\

.format(self.name)

command = plain.split()

logger.log_call(command, timeout=3)

plain = "virsh -c lxc:/// lxc-enter-namespace --noseclabel -- {} /usr/bin/systemctl restart vinit.service"\

.format(self.name)

command = plain.split()

logger.log_call(command, timeout=3)

@staticmethod

def create(name, rec=None):

'''

Create dirs, copy fs image, lxc_create

'''

logger.verbose('sliver_lxc: {} create'.format(name))

conn = Sliver_Libvirt.getConnection(Sliver_LXC.TYPE)

vref = rec['vref']

if vref is None:

vref = "lxc-f24-x86_64"

logger.log("sliver_libvirt: {}: WARNING - no vref attached, using hard-wired default {}"

.format(name, vref))

# compute guest arch from vref

# essentially we want x86_64 (default) or i686 here for libvirt

try:

(x, y, arch) = vref.split('-')

arch = "x86_64" if arch.find("64") >= 0 else "i686"

except:

arch = 'x86_64'

# Get the type of image from vref myplc tags specified as:

# pldistro = lxc

# fcdistro = squeeze

# arch x86_64

arch = 'x86_64'

tags = rec['rspec']['tags']

if 'arch' in tags:

arch = tags['arch']

if arch == 'i386':

arch = 'i686'

refImgDir = os.path.join(Sliver_LXC.REF_IMG_BASE_DIR, vref)

containerDir = os.path.join(Sliver_LXC.CON_BASE_DIR, name)

# check the template exists -- there's probably a better way..

if not os.path.isdir(refImgDir):

logger.log('sliver_lxc: {}: ERROR Could not create sliver - reference image {} not found'

.format(name, vref))

logger.log('sliver_lxc: {}: ERROR Expected reference image in {}'.format(name, refImgDir))

return

# during some time this fragment had been commented out

# but we're seeing cases where this code might actually be useful, so..

# this hopefully should be fixed now

# # in fedora20 we have some difficulty in properly cleaning up /vservers/<slicename>

# # also note that running e.g. btrfs subvolume create /vservers/.lvref/image /vservers/foo

# # behaves differently, whether /vservers/foo exists or not:

# # if /vservers/foo does not exist, it creates /vservers/foo

# # but if it does exist, then it creates /vservers/foo/image !!

# # so we need to check the expected container rootfs does not exist yet

# # this hopefully could be removed in a future release

if os.path.exists (containerDir):

logger.log("sliver_lxc: {}: WARNING cleaning up pre-existing {}".format(name, containerDir))

command = ['btrfs', 'subvolume', 'delete', containerDir]

logger.log_call(command, BTRFS_TIMEOUT)

# re-check

if os.path.exists (containerDir):

logger.log('sliver_lxc: {}: ERROR Could not create sliver - could not clean up empty {}'

.format(name, containerDir))

return

# Snapshot the reference image fs

# this assumes the reference image is in its own subvolume

command = ['btrfs', 'subvolume', 'snapshot', refImgDir, containerDir]

if not logger.log_call(command, timeout=BTRFS_TIMEOUT):

logger.log('sliver_lxc: ERROR Could not create BTRFS snapshot at {}'

.format(containerDir))

return

command = ['chmod', '755', containerDir]

logger.log_call(command)

# TODO: set quotas...

# Set hostname. A valid hostname cannot have '_'

#with open(os.path.join(containerDir, 'etc/hostname'), 'w') as f:

# print >>f, name.replace('_', '-')

# Add slices group if not already present

try:

group = grp.getgrnam('slices')

except:

command = ['/usr/sbin/groupadd', 'slices']

logger.log_call(command)

# Add unix account (TYPE is specified in the subclass)

command = ['/usr/sbin/useradd', '-g', 'slices', '-s', Sliver_LXC.SHELL, name, '-p', '*']

logger.log_call(command)

command = ['mkdir', '/home/{}/.ssh'.format(name)]

logger.log_call(command)

# Create PK pair keys to connect from the host to the guest without

# password... maybe remove the need for authentication inside the

# guest?

command = ['su', '-s', '/bin/bash', '-c',

'ssh-keygen -t rsa -N "" -f /home/{}/.ssh/id_rsa'.format(name)]

logger.log_call(command)

command = ['chown', '-R', '{}:slices'.format(name), '/home/{}/.ssh'.format(name)]

logger.log_call(command)

command = ['mkdir', '{}/root/.ssh'.format(containerDir)]

logger.log_call(command)

command = ['cp', '/home/{}/.ssh/id_rsa.pub'.format(name),

'{}/root/.ssh/authorized_keys'.format(containerDir)]

logger.log_call(command)

logger.log("creating /etc/slicename file in {}".format(os.path.join(containerDir, 'etc/slicename')))

try:

with open(os.path.join(containerDir, 'etc/slicename'), 'w') as f:

f.write(name)

except:

logger.log_exc("exception while creating /etc/slicename")

try:

with open(os.path.join(containerDir, 'etc/slicefamily'), 'w') as f:

f.write(vref)

except:

logger.log_exc("exception while creating /etc/slicefamily")

uid = None

try:

uid = getpwnam(name).pw_uid

except KeyError:

# keyerror will happen if user id was not created successfully

logger.log_exc("exception while getting user id")

if uid is not None:

logger.log("uid is {}".format(uid))

command = ['mkdir', '{}/home/{}'.format(containerDir, name)]

logger.log_call(command)

command = ['chown', name, '{}/home/{}'.format(containerDir, name)]

logger.log_call(command)

etcpasswd = os.path.join(containerDir, 'etc/passwd')

etcgroup = os.path.join(containerDir, 'etc/group')

if os.path.exists(etcpasswd):

# create all accounts with gid=1001 - i.e. 'slices' like it is in the root context

slices_gid = 1001

logger.log("adding user {name} id {uid} gid {slices_gid} to {etcpasswd}"

.format(**(locals())))

try:

with open(etcpasswd, 'a') as passwdfile:

passwdfile.write("{name}:x:{uid}:{slices_gid}::/home/{name}:/bin/bash\n"

.format(**locals()))

except:

logger.log_exc("exception while updating {}".format(etcpasswd))

logger.log("adding group slices with gid {slices_gid} to {etcgroup}"

.format(**locals()))

try:

with open(etcgroup, 'a') as groupfile:

groupfile.write("slices:x:{slices_gid}\n"

.format(**locals()))

except:

logger.log_exc("exception while updating {}".format(etcgroup))

sudoers = os.path.join(containerDir, 'etc/sudoers')

if os.path.exists(sudoers):

try:

with open(sudoers, 'a') as f:

f.write("{} ALL=(ALL) NOPASSWD: ALL\n".format(name))

except:

logger.log_exc("exception while updating /etc/sudoers")

# customizations for the user environment - root or slice uid

# we save the whole business in /etc/planetlab.profile

# and source this file for both root and the slice uid's .profile

# prompt for slice owner, + LD_PRELOAD for transparently wrap bind

pl_profile = os.path.join(containerDir, "etc/planetlab.profile")

ld_preload_text = """# by default, we define this setting so that calls to bind(2),

# when invoked on 0.0.0.0, get transparently redirected to the public interface of this node

# see https://svn.planet-lab.org/wiki/LxcPortForwarding"""

usrmove_path_text = """# VM's before Features/UsrMove need /bin and /sbin in their PATH"""

usrmove_path_code = """

pathmunge () {

if ! echo $PATH | /bin/egrep -q "(^|:)$1($|:)" ; then

if [ "$2" = "after" ] ; then

PATH=$PATH:$1

else

PATH=$1:$PATH

fi

fi

}

pathmunge /bin after

pathmunge /sbin after

unset pathmunge

"""

with open(pl_profile, 'w') as f:

f.write("export PS1='{}@\H \$ '\n".format(name))

f.write("{}\n".format(ld_preload_text))

f.write("if [ -e /etc/planetlab/lib/bind_public.so ] ; then # Only preload bind_public if it exists.\n")

f.write(" export LD_PRELOAD=/etc/planetlab/lib/bind_public.so\n")

f.write("fi\n")

f.write("{}\n".format(usrmove_path_text))

f.write("{}\n".format(usrmove_path_code))

# make sure this file is sourced from both root's and slice's .profile

enforced_line = "[ -f /etc/planetlab.profile ] && source /etc/planetlab.profile\n"

for path in [ 'root/.profile', 'home/{}/.profile'.format(name) ]:

from_root = os.path.join(containerDir, path)

# if dir is not yet existing let's forget it for now

if not os.path.isdir(os.path.dirname(from_root)): continue

found = False

try:

with open(from_root) as f:

contents = f.readlines()

for content in contents:

if content == enforced_line:

found = True

except IOError:

pass

if not found:

with open(from_root, "a") as user_profile:

user_profile.write(enforced_line)

# in case we create the slice's .profile when writing

if from_root.find("/home") >= 0:

command = ['chown', '{}:slices'.format(name), from_root]

logger.log_call(command)

# Lookup for xid and create template after the user is created so we

# can get the correct xid based on the name of the slice

xid = bwlimit.get_xid(name)

# Template for libvirt sliver configuration

template_filename_sliceimage = os.path.join(Sliver_LXC.REF_IMG_BASE_DIR, 'lxc_template.xml')

if os.path.isfile(template_filename_sliceimage):

logger.verbose("Using XML template {}".format(template_filename_sliceimage))

template_filename = template_filename_sliceimage

else:

logger.log("Cannot find XML template {}".format(template_filename_sliceimage))

return

interfaces = Sliver_Libvirt.get_interfaces_xml(rec)

try:

with open(template_filename) as f:

template = Template(f.read())

xml = template.substitute(name=name, xid=xid, interfaces=interfaces, arch=arch)

except IOError:

logger.log('Failed to parse or use XML template file {}'.format(template_filename))

return

# Lookup for the sliver before actually

# defining it, just in case it was already defined.

try:

dom = conn.lookupByName(name)

except:

dom = conn.defineXML(xml)

logger.verbose('lxc_create: {} -> {}'.format(name, Sliver_Libvirt.dom_details(dom)))

@staticmethod

def destroy(name):

# umount .ssh directory - only if mounted

Account.umount_ssh_dir(name)

logger.verbose ('sliver_lxc: {} destroy'.format(name))

conn = Sliver_Libvirt.getConnection(Sliver_LXC.TYPE)

containerDir = os.path.join(Sliver_LXC.CON_BASE_DIR, name)

try:

# Destroy libvirt domain

dom = conn.lookupByName(name)

except:

logger.verbose('sliver_lxc.destroy: Domain {} does not exist!'.format(name))

return

# Slivers with vsys running will fail the subvolume delete

# removeSliverFromVsys return True if it stops vsys, telling us to start it again later

vsys_stopped = removeSliverFromVsys (name)

try:

logger.log("sliver_lxc.destroy: destroying domain {}".format(name))

dom.destroy()

except:

logger.verbose("sliver_lxc.destroy: Domain {} not running... continuing.".format(name))

try:

logger.log("sliver_lxc.destroy: undefining domain {}".format(name))

dom.undefine()

except:

logger.verbose('sliver_lxc.destroy: Domain {} is not defined... continuing.'.format(name))

# Remove user after destroy domain to force logout

command = ['/usr/sbin/userdel', '-f', '-r', name]

logger.log_call(command)

# Remove rootfs of destroyed domain

command = ['/usr/bin/rm', '-rf', containerDir]

logger.log_call(command, timeout=BTRFS_TIMEOUT)

# ???

logger.log("-TMP-ls-l {}".format(name))

command = ['ls', '-lR', containerDir]

logger.log_call(command)

logger.log("-TMP-vsys-status")

command = ['/usr/bin/systemctl', 'status', 'vsys']

logger.log_call(command)

# ???

# Remove rootfs of destroyed domain

command = ['btrfs', 'subvolume', 'delete', containerDir]

logger.log_call(command, timeout=BTRFS_TIMEOUT)

# For some reason I am seeing this :

#log_call: running command btrfs subvolume delete /vservers/inri_sl1

#log_call: ERROR: cannot delete '/vservers/inri_sl1' - Device or resource busy

#log_call: Delete subvolume '/vservers/inri_sl1'

#log_call:end command (btrfs subvolume delete /vservers/inri_sl1) returned with code 1

#

# something must have an open handle to a file in there, but I can't find out what it is

# the following code aims at gathering data on what is going on in the system at this point in time

# note that some time later (typically when the sliver gets re-created) the same

# attempt at deleting the subvolume does work

# also lsof never shows anything relevant; this is painful..

if not os.path.exists(containerDir):

logger.log('sliver_lxc.destroy: {} cleanly destroyed.'.format(name))

else:

# we're in /

#logger.log("-TMP-cwd {} : {}".format(name, os.getcwd()))

# also lsof never shows anything relevant; this is painful..

#logger.log("-TMP-lsof {}".format(name))

#command = ['lsof']

#logger.log_call(command)

logger.log("-TMP-ls-l {}".format(name))

command = ['ls', '-lR', containerDir]

logger.log_call(command)

logger.log("-TMP-lsof")

command = ['lsof']

logger.log_call(command)

if os.path.exists(containerDir):

logger.log('sliver_lxc.destroy: ERROR could not cleanly destroy {} - giving up'.format(name))

if vsys_stopped: