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= How to write a backend, in five easy steps! =
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There are five main methods you want to implement:
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__init__ - Initial setup
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_list - List all files in the backend
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_delete - Delete one file
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There are other methods you may optionally implement:
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Always subclass from duplicity.backend.Backend
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You can register your class as a single backend like so:
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duplicity.backend.register_backend("foo", FooBackend)
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This will allow a URL like so: foo://hostname/path
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Or you can register your class as a meta backend like so:
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duplicity.backend.register_prefix_backend("bar", BarBackend)
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Which will allow a URL like so: bar+foo://hostname/path and your class will
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be passed the inner URL to either interpret how you like or create a new
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inner backend instance with duplicity.backend.get_backend(url).
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When writing helper methods for your class, please prefix them with two
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underscores. While you can define other no- or single-underscore prefixed
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methods, we don't guarantee that that method name won't later be used
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by the main Backend class.
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duplicity/backends/README
