# Copyright 2005 Princeton University
+#$Id: vserver.py,v 1.59 2007/07/17 17:56:04 faiyaza Exp $
+
import errno
import fcntl
import os
import mountimpl
import runcmd
import utmp
-import vserverimpl, vduimpl
+import vserverimpl
import cpulimit, bwlimit
from vserverimpl import VS_SCHED_CPU_GUARANTEED as SCHED_CPU_GUARANTEED
class NoSuchVServer(Exception): pass
+class VServerConfig:
+ def __init__(self, name, directory):
+ self.name = name
+ self.dir = directory
+
+ def get(self, option, default = None):
+ try:
+ f = open(os.path.join(self.dir, option), "r")
+ buf = f.readline().rstrip()
+ f.close()
+ return buf
+ except KeyError, e:
+ # No mapping exists for this option
+ raise e
+ except IOError, e:
+ if default is not None:
+ return default
+ else:
+ raise KeyError, "Key %s is not set for %s" % (option, self.name)
+
+ def update(self, option, value):
+ try:
+ old_umask = os.umask(0022)
+ filename = os.path.join(self.dir, option)
+ try:
+ os.makedirs(os.path.dirname(filename), 0755)
+ except:
+ pass
+ f = open(filename, 'w')
+ if isinstance(value, list):
+ f.write("%s\n" % "\n".join(value))
+ else:
+ f.write("%s\n" % value)
+ f.close()
+ os.umask(old_umask)
+ except KeyError, e:
+ raise KeyError, "Don't know how to handle %s, sorry" % option
+
+
class VServer:
INITSCRIPTS = [('/etc/rc.vinit', 'start'),
('/etc/rc.d/rc', '%(runlevel)d')]
- def __init__(self, name, vm_id = None, vm_running = False):
+ def __init__(self, name, vm_id = None, vm_running = None):
self.name = name
self.rlimits_changed = False
- self.config_file = "/etc/vservers/%s.conf" % name
self.dir = "%s/%s" % (vserverimpl.VSERVER_BASEDIR, name)
if not (os.path.isdir(self.dir) and
os.access(self.dir, os.R_OK | os.W_OK | os.X_OK)):
raise NoSuchVServer, "no such vserver: " + name
- self.config = {}
- for config_file in ["/etc/vservers.conf", self.config_file]:
- try:
- self.config.update(self.__read_config_file(config_file))
- except IOError, ex:
- if ex.errno != errno.ENOENT:
- raise
+ self.config = VServerConfig(name, "/etc/vservers/%s" % name)
self.remove_caps = ~vserverimpl.CAP_SAFE;
if vm_id == None:
- vm_id = int(self.config['S_CONTEXT'])
+ vm_id = int(self.config.get('context'))
self.ctx = vm_id
+ if vm_running == None:
+ vm_running = self.is_running()
self.vm_running = vm_running
def have_limits_changed(self):
def set_rlimit_config(self,type,hard,soft,minimum):
"""Generic set resource limit function for vserver"""
- resources = {}
if hard <> VC_LIM_KEEP:
- resources["VS_%s_HARD"%type] = hard
+ self.config.update('rlimits/%s.hard' % type.lower(), hard)
if soft <> VC_LIM_KEEP:
- resources["VS_%s_SOFT"%type] = soft
+ self.config.update('rlimits/%s.soft' % type.lower(), soft)
if minimum <> VC_LIM_KEEP:
- resources["VS_%s_MINIMUM"%type] = minimum
- if len(resources)>0:
- self.update_resources(resources)
+ self.config.update('rlimits/%s.min' % type.lower(), minimum)
self.set_rlimit_limit(type,hard,soft,minimum)
def get_rlimit_limit(self,type):
def get_rlimit_config(self,type):
"""Generic get resource configuration function for vserver"""
- hard = int(self.config.get("VS_%s_HARD"%type,VC_LIM_KEEP))
- soft = int(self.config.get("VS_%s_SOFT"%type,VC_LIM_KEEP))
- minimum = int(self.config.get("VS_%s_MINIMUM"%type,VC_LIM_KEEP))
+ hard = int(self.config.get("rlimits/%s.hard"%type.lower(),VC_LIM_KEEP))
+ soft = int(self.config.get("rlimits/%s.soft"%type.lower(),VC_LIM_KEEP))
+ minimum = int(self.config.get("rlimits/%s.min"%type.lower(),VC_LIM_KEEP))
return (hard,soft,minimum)
def set_WHITELISTED_config(self,whitelisted):
- resources = {'VS_WHITELISTED': whitelisted}
- self.update_resources(resources)
+ self.config.update('whitelisted', whitelisted)
- config_var_re = re.compile(r"^ *([A-Z_]+)=(.*)\n?$", re.MULTILINE)
+ def set_capabilities(self, capabilities):
+ return vserverimpl.setbcaps(self.ctx, vserverimpl.text2bcaps(capabilities))
- def __read_config_file(self, filename):
-
- f = open(filename, "r")
- data = f.read()
- f.close()
- config = {}
- for m in self.config_var_re.finditer(data):
- (key, val) = m.groups()
- config[key] = val.strip('"')
- return config
+ def set_capabilities_config(self, capabilities):
+ self.config.update('bcapabilities', capabilities)
+ self.set_capabilities(capabilities)
- def __update_config_file(self, filename, newvars):
-
- # read old file, apply changes
- f = open(filename, "r")
- data = f.read()
- f.close()
- todo = newvars.copy()
- changed = False
- offset = 0
- for m in self.config_var_re.finditer(data):
- (key, val) = m.groups()
- newval = todo.pop(key, None)
- if newval != None:
- data = data[:offset+m.start(2)] + str(newval) + data[offset+m.end(2):]
- offset += len(str(newval)) - (m.end(2)-m.start(2))
- changed = True
- for (newkey, newval) in todo.items():
- data += "%s=%s\n" % (newkey, newval)
- changed = True
-
- if not changed:
- return
-
- # write new file
- newfile = filename + ".new"
- f = open(newfile, "w")
- f.write(data)
- f.close()
-
- # replace old file with new
- os.rename(newfile, filename)
+ def get_capabilities(self):
+ return vserverimpl.bcaps2text(vserverimpl.getbcaps(self.ctx))
+
+ def get_capabilities_config(self):
+ return self.config.get('bcapabilities')
def __do_chroot(self):
print "Unexpected error with setdlimit for context %d" % self.ctx
- resources = {'VS_DISK_MAX': block_limit}
- self.update_resources(resources)
+ self.config.update('dlimits/0/space_total', block_limit)
def is_running(self):
return vserverimpl.isrunning(self.ctx)
configuration file. This method does not modify the kernel CPU
scheduling parameters for this context. """
- if cpu_share == int(self.config.get("CPULIMIT", -1)):
- return
- cpu_guaranteed = sched_flags & SCHED_CPU_GUARANTEED
- cpu_config = { "CPULIMIT": cpu_share, "CPUGUARANTEED": cpu_guaranteed }
- self.update_resources(cpu_config)
+ if sched_flags & SCHED_CPU_GUARANTEED:
+ cpu_guaranteed = cpu_share
+ else:
+ cpu_guaranteed = 0
+ self.config.update('sched/fill-rate2', cpu_share)
+ self.config.update('sched/fill-rate', cpu_guaranteed)
+
if self.vm_running:
self.set_sched(cpu_share, sched_flags)
def __do_chcontext(self, state_file):
if state_file:
- print >>state_file, "S_CONTEXT=%u" % self.ctx
- print >>state_file, "S_PROFILE="
+ print >>state_file, "%u" % self.ctx
state_file.close()
- if vserverimpl.chcontext(self.ctx):
+ if vserverimpl.chcontext(self.ctx, vserverimpl.text2bcaps(self.get_capabilities_config())):
self.set_resources()
vserverimpl.setup_done(self.ctx)
([], filter_fn))[0]
garbage += filter(os.path.isfile, map((LOCKDIR + "/").__add__,
os.listdir(LOCKDIR)))
- if False:
- for f in garbage:
- os.unlink(f)
+ for f in garbage:
+ os.unlink(f)
# set the initial runlevel
f = open(RUNDIR + "/utmp", "w")
raise ex
def enter(self):
-
- state_file = open("/var/run/vservers/%s.ctx" % self.name, "w")
self.__do_chroot()
- self.__do_chcontext(state_file)
+ self.__do_chcontext(None)
def start(self, wait, runlevel = 3):
self.vm_running = True
os.setsid()
# open state file to record vserver info
- state_file = open("/var/run/vservers/%s.ctx" % self.name, "w")
+ state_file = open("/var/run/vservers/%s" % self.name, "w")
# use /dev/null for stdin, /var/log/boot.log for stdout/err
os.close(0)
pass
- def update_resources(self, resources):
-
- self.config.update(resources)
-
- # write new values to configuration file
- self.__update_config_file(self.config_file, resources)
-
def init_disk_info(self):
-
- (self.disk_inodes, self.disk_blocks, size) = vduimpl.vdu(self.dir)
-
- return size
+ cmd = "/usr/sbin/vdu --script --space --inodes --blocksize 1024 --xid %d %s" % (self.ctx, self.dir)
+ (child_stdin, child_stdout, child_stderr) = os.popen3(cmd)
+ child_stdin.close()
+ line = child_stdout.readline()
+ if not line:
+ sys.stderr.write(child_stderr.readline())
+ (space, inodes) = line.split()
+ self.disk_inodes = int(inodes)
+ self.disk_blocks = int(space)
+ #(self.disk_inodes, self.disk_blocks) = vduimpl.vdu(self.dir)
+
+ return self.disk_blocks * 1024
def stop(self, signal = signal.SIGKILL):
vserverimpl.killall(self.ctx, signal)
git://git.onelab.eu / util-vserver.git / commitdiff