[session] enforce coherency of login/passwd couple values when no anonymous user (closes: #1910849)
None may be returned for both if anonymous connection is not
allowed or if an empty login is used in configuration
Raise ConfigurationError is anonymous login is non-ascii (convention)
try:
rtype, = __args__
except ValueError:
print 'USAGE: cubicweb-ctl shell <instance> detect_cycle.py -- <relation type>'
print
graph = {}
for fromeid, toeid in rql('Any X,Y WHERE X %s Y' % rtype):
graph.setdefault(fromeid, []).append(toeid)
from logilab.common.graph import get_cycles
for cycle in get_cycles(graph):
print 'cycle', '->'.join(str(n) for n in cycle)