root / lib / runtime.py @ 28d466dc
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# Copyright (C) 2010 Google Inc.
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful, but
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# WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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# General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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# 02110-1301, USA.
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"""Module implementing configuration details at runtime.
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"""
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import grp |
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import pwd |
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import threading |
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import platform |
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from ganeti import constants |
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from ganeti import errors |
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from ganeti import utils |
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_priv = None
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_priv_lock = threading.Lock() |
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#: Architecture information
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_arch = None
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def GetUid(user, _getpwnam): |
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"""Retrieve the uid from the database.
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@type user: string
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@param user: The username to retrieve
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@return: The resolved uid
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"""
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try:
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return _getpwnam(user).pw_uid
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except KeyError, err: |
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raise errors.ConfigurationError("User '%s' not found (%s)" % (user, err)) |
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def GetGid(group, _getgrnam): |
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"""Retrieve the gid from the database.
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@type group: string
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@param group: The group name to retrieve
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@return: The resolved gid
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"""
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try:
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return _getgrnam(group).gr_gid
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except KeyError, err: |
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raise errors.ConfigurationError("Group '%s' not found (%s)" % (group, err)) |
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class GetentResolver: |
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"""Resolves Ganeti uids and gids by name.
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@ivar masterd_uid: The resolved uid of the masterd user
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@ivar masterd_gid: The resolved gid of the masterd group
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@ivar confd_uid: The resolved uid of the confd user
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@ivar confd_gid: The resolved gid of the confd group
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@ivar luxid_uid: The resolved uid of the luxid user
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@ivar luxid_gid: The resolved gid of the luxid group
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@ivar rapi_uid: The resolved uid of the rapi user
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@ivar rapi_gid: The resolved gid of the rapi group
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@ivar noded_uid: The resolved uid of the noded user
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@ivar daemons_gid: The resolved gid of the daemons group
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@ivar admin_gid: The resolved gid of the admin group
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"""
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def __init__(self, _getpwnam=pwd.getpwnam, _getgrnam=grp.getgrnam): |
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"""Initialize the resolver.
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"""
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# Daemon pairs
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self.masterd_uid = GetUid(constants.MASTERD_USER, _getpwnam)
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self.masterd_gid = GetGid(constants.MASTERD_GROUP, _getgrnam)
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self.confd_uid = GetUid(constants.CONFD_USER, _getpwnam)
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self.confd_gid = GetGid(constants.CONFD_GROUP, _getgrnam)
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self.luxid_uid = GetUid(constants.LUXID_USER, _getpwnam)
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self.luxid_gid = GetGid(constants.LUXID_GROUP, _getgrnam)
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self.rapi_uid = GetUid(constants.RAPI_USER, _getpwnam)
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self.rapi_gid = GetGid(constants.RAPI_GROUP, _getgrnam)
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self.noded_uid = GetUid(constants.NODED_USER, _getpwnam)
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self.noded_gid = GetGid(constants.NODED_GROUP, _getgrnam)
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self.mond_uid = GetUid(constants.MOND_USER, _getpwnam)
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self.mond_gid = GetGid(constants.MOND_GROUP, _getgrnam)
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# Misc Ganeti groups
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self.daemons_gid = GetGid(constants.DAEMONS_GROUP, _getgrnam)
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self.admin_gid = GetGid(constants.ADMIN_GROUP, _getgrnam)
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self._uid2user = {
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self.masterd_uid: constants.MASTERD_USER,
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self.confd_uid: constants.CONFD_USER,
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self.luxid_uid: constants.LUXID_USER,
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self.rapi_uid: constants.RAPI_USER,
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self.noded_uid: constants.NODED_USER,
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self.mond_uid: constants.MOND_USER,
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} |
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self._gid2group = {
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self.masterd_gid: constants.MASTERD_GROUP,
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self.confd_gid: constants.CONFD_GROUP,
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self.luxid_gid: constants.LUXID_GROUP,
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self.rapi_gid: constants.RAPI_GROUP,
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self.noded_gid: constants.NODED_GROUP,
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self.mond_gid: constants.MOND_GROUP,
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self.daemons_gid: constants.DAEMONS_GROUP,
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self.admin_gid: constants.ADMIN_GROUP,
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} |
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self._user2uid = utils.InvertDict(self._uid2user) |
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self._group2gid = utils.InvertDict(self._gid2group) |
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def LookupUid(self, uid): |
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"""Looks which Ganeti user belongs to this uid.
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@param uid: The uid to lookup
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@returns The user name associated with that uid
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"""
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try:
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return self._uid2user[uid] |
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except KeyError: |
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raise errors.ConfigurationError("Unknown Ganeti uid '%d'" % uid) |
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def LookupGid(self, gid): |
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"""Looks which Ganeti group belongs to this gid.
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@param gid: The gid to lookup
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@returns The group name associated with that gid
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"""
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try:
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return self._gid2group[gid] |
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except KeyError: |
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raise errors.ConfigurationError("Unknown Ganeti gid '%d'" % gid) |
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def LookupUser(self, name): |
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"""Looks which uid belongs to this name.
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@param name: The name to lookup
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@returns The uid associated with that user name
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"""
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try:
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return self._user2uid[name] |
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except KeyError: |
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raise errors.ConfigurationError("Unknown Ganeti user '%s'" % name) |
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def LookupGroup(self, name): |
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"""Looks which gid belongs to this name.
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@param name: The name to lookup
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@returns The gid associated with that group name
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"""
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try:
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return self._group2gid[name] |
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except KeyError: |
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raise errors.ConfigurationError("Unknown Ganeti group '%s'" % name) |
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def GetEnts(resolver=GetentResolver): |
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"""Singleton wrapper around resolver instance.
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As this method is accessed by multiple threads at the same time
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we need to take thread-safety carefully.
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"""
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# We need to use the global keyword here
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global _priv # pylint: disable=W0603 |
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if not _priv: |
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_priv_lock.acquire() |
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try:
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if not _priv: |
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# W0621: Redefine '_priv' from outer scope (used for singleton)
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_priv = resolver() # pylint: disable=W0621
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finally:
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_priv_lock.release() |
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return _priv
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def InitArchInfo(): |
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"""Initialize architecture information.
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We can assume this information never changes during the lifetime of a
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process, therefore the information can easily be cached.
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@note: This function uses C{platform.architecture} to retrieve the Python
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binary architecture and does so by forking to run C{file} (see Python
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documentation for more information). Therefore it must not be used in a
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multi-threaded environment.
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"""
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global _arch # pylint: disable=W0603 |
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if _arch is not None: |
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raise errors.ProgrammerError("Architecture information can only be" |
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" initialized once")
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_arch = (platform.architecture()[0], platform.machine())
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def GetArchInfo(): |
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"""Returns previsouly initialized architecture information.
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"""
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if _arch is None: |
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raise errors.ProgrammerError("Architecture information hasn't been" |
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" initialized")
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return _arch
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