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"""
Enables the "cobbler enchant" command to apply profiles
to remote systems, whether or not they are running koan.
Copyright 2006, Red Hat, Inc
Michael DeHaan <mdehaan@redhat.com>
This software may be freely redistributed under the terms of the GNU
general public license.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
"""
import cexceptions
import os
import os.path
import sub_process
import traceback
class Enchant:
def __init__(self,config,address,profile,system,is_virt):
"""
Constructor.
config: a configuration reference (see api module)
sysname: address of system to enchant (not necc. defined in cobbler)
profile: profile to make the system become
"""
self.config = config
self.settings = self.config.settings()
self.address = address
self.profile = profile
self.system = system
self.is_virt = is_virt
if address is None:
raise cexceptions.CobblerException("enchant_failed","no address specified")
if system is None and profile is None:
raise cexceptions.CobblerException("enchant_failed","no profile specified")
if system is not None and self.config.systems().find(system) is None:
raise cexceptions.CobblerException("enchant_failed","system name not found")
if profile is not None and self.config.profiles().find(profile) is None:
raise cexceptions.CobblerException("enchant_failed","profile name not found")
def ssh_exec(self,cmd,catch_fail=True):
"""
Invoke an SSH command.
-o 'HostKeyAlias NoHostKeyStorage'
"""
cmd2 = "ssh -o 'StrictHostKeyChecking=no' -o 'HostKeyAlias nocobblerhostkey' root@%s %s" % (self.address,cmd)
print "running: %s" % cmd2
rc = sub_process.call(cmd2,shell=True)
print "returns: %d" % rc
if catch_fail and rc != 0:
raise cexceptions.CobblerException("enchant_failed","ssh failure")
def run(self):
"""
Replace the OS of a remote system.
"""
# clean out known hosts file to eliminate conflicts
known_hosts = open("/root/.ssh/known_hosts","r")
data = known_hosts.read()
known_hosts.close()
known_hosts = open("/root/.ssh/known_hosts","w+")
for line in data.split("\n"):
if not line.startswith("nocobblerhostkey"):
known_hosts.write(line)
known_hosts.write("\n")
known_hosts.close()
# make sure the koan rpm is present, if it's not there, user didn't run sync first
# or it's not configured in /var/lib/cobbler/settings
koan = os.path.basename(self.settings.koan_path)
where_is_koan = os.path.join(self.settings.webdir,os.path.basename(koan))
if not os.path.exists(where_is_koan) or os.path.isdir(where_is_koan):
raise cexceptions.CobblerException("enchant_failed","koan is missing")
try:
self.ssh_exec("wget http://%s/cobbler/%s" % (self.settings.server, koan))
# koan doesn't require libvirt-python, but uses it for koan --virt options if available
# so, if --virt is requested, we have to make sure it's installed. It's probably
# reasonable to just assume it /IS/ installed though as Xen kernel usage is required.
extra_virt_packages = ""
if self.is_virt:
extra_virt_packages = " libvirt-python libvirt"
# package installation without knowing whether the target is yum-based or not
self.ssh_exec("up2date install syslinux%s" % (extra_virt_packages), catch_fail=False)
self.ssh_exec("yum -y install syslinux%s" % (extra_virt_packages), catch_fail=False)
self.ssh_exec("rpm -Uvh %s --force --nodeps" % koan)
# choose SSH command line based on whether this command was given --virt or not
operation = "--replace-self"
if self.is_virt:
operation = "--virt"
if self.system:
self.ssh_exec("koan %s --system=%s --server=%s" % (operation, self.system, self.settings.server))
else:
self.ssh_exec("koan %s --profile=%s --server=%s" % (operation, self.profile, self.settings.server))
# don't have to reboot for virt installs
if not self.is_virt:
self.ssh_exec("/sbin/reboot")
return True
except:
traceback.print_exc()
raise cexceptions.CobblerException("enchant_failed","exception")
return False # shouldn't be here
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