misc/scripts/repair_splitbrain_ldapuser_source.py
author Aurelien Campeas <aurelien.campeas@logilab.fr>
Wed, 23 Jan 2013 18:20:05 +0100
changeset 8676 c5690cb9d2ba
parent 8568 56d9eb013feb
child 10589 7c23b7de2b8d
permissions -rw-r--r--
[doc/3.16] complete description of what changed
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"""
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CAUTION: READ THIS CAREFULLY
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Sometimes it happens that ldap (specifically ldapuser type) source
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yield "ghost" users. The reasons may vary (server upgrade while some
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instances are still running & syncing with the ldap source, unmanaged
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updates to the upstream ldap, etc.).
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This script was written and refined enough times that we are confident
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in that it does something reasonnable (at least it did for the
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target application).
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However you should really REALLY understand what it does before
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deciding to apply it for you. And then ADAPT it tou your needs.
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"""
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import base64
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from collections import defaultdict
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from cubicweb.server.session import hooks_control
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try:
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    source_name, = __args__
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    source = repo.sources_by_uri[source_name]
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except ValueError:
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    print('you should specify the source name as script argument (i.e. after --'
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          ' on the command line)')
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    sys.exit(1)
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except KeyError:
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    print '%s is not an active source' % source_name
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    sys.exit(1)
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# check source is reachable before doing anything
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if not source.get_connection().cnx:
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    print '%s is not reachable. Fix this before running this script' % source_name
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    sys.exit(1)
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def find_dupes():
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    # XXX this retrieves entities from a source name "ldap"
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    #     you will want to adjust
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    rset = sql("SELECT eid, extid FROM entities WHERE source='%s'" % source_name)
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    extid2eids = defaultdict(list)
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    for eid, extid in rset:
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        extid2eids[extid].append(eid)
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    return dict((base64.b64decode(extid).lower(), eids)
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                for extid, eids in extid2eids.items()
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                if len(eids) > 1)
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def merge_dupes(dupes, docommit=False):
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    gone_eids = []
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    CWUser = schema['CWUser']
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    for extid, eids in dupes.items():
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        newest = eids.pop() # we merge everything on the newest
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        print 'merging ghosts of', extid, 'into', newest
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        # now we merge pairwise into the newest
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        for old in eids:
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            subst = {'old': old, 'new': newest}
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            print '  merging', old
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            gone_eids.append(old)
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            for rschema in CWUser.subject_relations():
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                if rschema.final or rschema == 'identity':
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                    continue
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                if CWUser.rdef(rschema, 'subject').composite == 'subject':
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                    # old 'composite' property is wiped ...
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                    # think about email addresses, excel preferences
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                    for eschema in rschema.objects():
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                        rql('DELETE %s X WHERE U %s X, U eid %%(old)s' % (eschema, rschema), subst)
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                else:
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                    # relink the new user to its old relations
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                    rql('SET NU %s X WHERE NU eid %%(new)s, NOT NU %s X, OU %s X, OU eid %%(old)s' %
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                        (rschema, rschema, rschema), subst)
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                    # delete the old relations
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                    rql('DELETE U %s X WHERE U eid %%(old)s' % rschema, subst)
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            # same thing ...
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            for rschema in CWUser.object_relations():
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                if rschema.final or rschema == 'identity':
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                    continue
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                rql('SET X %s NU WHERE NU eid %%(new)s, NOT X %s NU, X %s OU, OU eid %%(old)s' %
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                    (rschema, rschema, rschema), subst)
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                rql('DELETE X %s U WHERE U eid %%(old)s' % rschema, subst)
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    if not docommit:
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        rollback()
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        return
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    commit() # XXX flushing operations is wanted rather than really committing
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    print 'clean up entities table'
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    sql('DELETE FROM entities WHERE eid IN (%s)' % (', '.join(str(x) for x in gone_eids)))
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    commit()
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def main():
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    dupes = find_dupes()
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    if not dupes:
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        print 'No duplicate user'
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        return
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    95
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    print 'Found %s duplicate user instances' % len(dupes)
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    97
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    while True:
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        print 'Fix or dry-run? (f/d)  ... or Ctrl-C to break out'
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        answer = raw_input('> ')
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        if answer.lower() not in 'fd':
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            continue
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        print 'Please STOP THE APPLICATION INSTANCES (service or interactive), and press Return when done.'
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        raw_input('<I swear all running instances and workers of the application are stopped>')
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        with hooks_control(session, session.HOOKS_DENY_ALL):
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            merge_dupes(dupes, docommit=answer=='f')
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main()