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Viewing changes to src/provisioningserver/pserv_services/tests/test_tftp.py

[r=allenap][bug=1524007][author=allenap] Backport of r4551 from lp:maas: By default, open configuration files read-only.

This eliminates the need for locking when using the YAML-based back-end.

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src/provisioningserver/pserv_services/tests/test_tftp.py
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    @inlineCallbacks
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    def test_get_reader_converts_404s_to_tftp_error(self):
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        with ClusterConfiguration.open() as config:
 
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        with ClusterConfiguration.open_for_update() as config:
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            config.cluster_uuid = factory.make_UUID()
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        backend = TFTPBackend(
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    @inlineCallbacks
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    def test_get_reader_converts_other_exceptions_to_tftp_error(self):
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        with ClusterConfiguration.open() as config:
 
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        with ClusterConfiguration.open_for_update() as config:
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            config.cluster_uuid = factory.make_UUID()
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        exception_type = factory.make_exception_type()
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        # For paths matching PXEBootMethod.match_path, TFTPBackend.get_reader()
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        # returns a Deferred that will yield a BytesReader.
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        cluster_uuid = factory.make_UUID()
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        with ClusterConfiguration.open() as config:
 
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        with ClusterConfiguration.open_for_update() as config:
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            config.cluster_uuid = cluster_uuid
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        mac = factory.make_mac_address("-")
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        config_path = compose_config_path(mac)
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        # arch field of the parameters (mapping from pxe to maas
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        # namespace).
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        cluster_uuid = factory.make_UUID()
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        with ClusterConfiguration.open() as config:
 
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        with ClusterConfiguration.open_for_update() as config:
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            config.cluster_uuid = cluster_uuid
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        config_path = "pxelinux.cfg/default-arm"
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        backend = TFTPBackend(