X-Git-Url: http://git.onelab.eu/?a=blobdiff_plain;f=accounts.py;h=480129c41717ffd3aefb04d4afc8ea9929b3fb7c;hb=refs%2Fheads%2F1.7;hp=b330033fa91ef8d477fa7d1158786ee088e47b18;hpb=4d9692d62b91108ef3b705dd92b1aa93a76cdc8a;p=nodemanager.git diff --git a/accounts.py b/accounts.py index b330033..480129c 100644 --- a/accounts.py +++ b/accounts.py @@ -23,17 +23,24 @@ maximum stack size. import Queue import os import pwd +from grp import getgrnam import threading import logger import tools +# When this variable is true, start after any ensure_created +Startingup = False # shell path -> account class association shell_acct_class = {} # account type -> account class association type_acct_class = {} +# these semaphores are acquired before creating/destroying an account +create_sem = threading.Semaphore(1) +destroy_sem = threading.Semaphore(1) + def register_class(acct_class): """Call once for each account class. This method adds the class to the dictionaries used to look up account classes by shell and type.""" shell_acct_class[acct_class.SHELL] = acct_class @@ -44,9 +51,12 @@ def register_class(acct_class): name_worker_lock = threading.Lock() name_worker = {} +def allpwents(): + return [pw_ent for pw_ent in pwd.getpwall() if pw_ent[6] in shell_acct_class] + def all(): """Return the names of all accounts on the system with recognized shells.""" - return [pw_ent[0] for pw_ent in pwd.getpwall() if pw_ent[6] in shell_acct_class] + return [pw_ent[0] for pw_ent in allpwents()] def get(name): """Return the worker object for a particular username. If no such object exists, create it first.""" @@ -59,86 +69,84 @@ def get(name): class Account: def __init__(self, rec): + logger.verbose('Initing account %s'%rec['name']) self.name = rec['name'] self.keys = '' + self.initscriptchanged = False self.configure(rec) @staticmethod - def create(name): abstract + def create(name, vref = None): abstract @staticmethod def destroy(name): abstract def configure(self, rec): """Write to my authorized_keys file.""" + logger.verbose('%s: in accounts:configure'%self.name) new_keys = rec['keys'] if new_keys != self.keys: self.keys = new_keys dot_ssh = '/home/%s/.ssh' % self.name - def do_installation(): - if not os.access(dot_ssh, os.F_OK): os.mkdir(dot_ssh) - tools.write_file(dot_ssh + '/authorized_keys', lambda f: f.write(new_keys)) + if not os.access(dot_ssh, os.F_OK): os.mkdir(dot_ssh) + os.chmod(dot_ssh, 0700) + tools.write_file(dot_ssh + '/authorized_keys', lambda f: f.write(new_keys)) logger.log('%s: installing ssh keys' % self.name) - tools.fork_as(self.name, do_installation) + user = pwd.getpwnam(self.name)[2] + group = getgrnam("slices")[2] + os.chown(dot_ssh, user, group) + os.chown(dot_ssh + '/authorized_keys', user, group) def start(self, delay=0): pass def stop(self): pass - + def is_running(self): pass class Worker: - # these semaphores are acquired before creating/destroying an account - _create_sem = threading.Semaphore(1) - _destroy_sem = threading.Semaphore(1) - def __init__(self, name): self.name = name # username self._acct = None # the account object currently associated with this worker - # task list - # outsiders request operations by putting (fn, args...) tuples on _q - # the worker thread (created below) will perform these operations in order - self._q = Queue.Queue() - tools.as_daemon_thread(self._run) - def ensure_created(self, rec): - """Cause the account specified by to exist if it doesn't already.""" - self._q.put((self._ensure_created, rec.copy())) - - def _ensure_created(self, rec): + def ensure_created(self, rec, startingup = Startingup): + """Check account type is still valid. If not, recreate sliver. If still valid, + check if running and configure/start if not.""" curr_class = self._get_class() next_class = type_acct_class[rec['type']] if next_class != curr_class: self._destroy(curr_class) - self._create_sem.acquire() + create_sem.acquire() try: next_class.create(self.name, rec['vref']) - finally: self._create_sem.release() + finally: create_sem.release() if not isinstance(self._acct, next_class): self._acct = next_class(rec) + if startingup or \ + not self.is_running() or \ + next_class != curr_class or \ + self._acct.initscriptchanged: + self.start(rec) else: self._acct.configure(rec) - if next_class != curr_class: self._acct.start() - def ensure_destroyed(self): self._q.put((self._ensure_destroyed,)) - def _ensure_destroyed(self): self._destroy(self._get_class()) + def ensure_destroyed(self): self._destroy(self._get_class()) + + def start(self, rec, d = 0): + self._acct.configure(rec) + self._acct.start(delay=d) - def start(self, delay=0): self._q.put((self._start, delay)) - def _start(self, d): self._acct.start(delay=d) + def stop(self): self._acct.stop() - def stop(self): self._q.put((self._stop,)) - def _stop(self): self._acct.stop() + def is_running(self): + if (self._acct != None) and self._acct.is_running(): + status = True + else: + status = False + logger.verbose("Worker(%s): is not running" % self.name) + return status def _destroy(self, curr_class): self._acct = None if curr_class: - self._destroy_sem.acquire() + destroy_sem.acquire() try: curr_class.destroy(self.name) - finally: self._destroy_sem.release() + finally: destroy_sem.release() def _get_class(self): try: shell = pwd.getpwnam(self.name)[6] except KeyError: return None return shell_acct_class[shell] - - def _run(self): - """Repeatedly pull commands off the queue and execute. If memory usage becomes an issue, it might be wise to terminate after a while.""" - while True: - try: - cmd = self._q.get() - cmd[0](*cmd[1:]) - except: logger.log_exc()