[devtools] make PostgresTestDataBaseHandler start its own postgresql Don't depend on postgresql already running on the system, or on a static config. To use this, set the configcls attribute of your CubicWebTC-derived test class to PostgresApptestConfiguration. Caveats: - this won't work with several tests running concurrently from the same directory, since each would start its own cluster with a shared data directory and stomp on each other's toes - you need initdb/pg_ctl in $PATH, e.g /usr/lib/postgresql/$version/bin on Debian/Ubuntu systems. Closes #3489631

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−
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−try:
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−    rtype, = __args__
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−except ValueError:
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−    print 'USAGE: cubicweb-ctl shell <instance> detect_cycle.py -- <relation type>'
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−    print
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−
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−graph = {}
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−for fromeid, toeid in rql('Any X,Y WHERE X %s Y' % rtype):
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−    graph.setdefault(fromeid, []).append(toeid)
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−
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−from logilab.common.graph import get_cycles
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−
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−for cycle in get_cycles(graph):
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−    print 'cycle', '->'.join(str(n) for n in cycle)