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revlog: add method for obtaining storage info (API)...
revlog: add method for obtaining storage info (API) We currently have a handful of methods on the file and manifest storage interfaces for obtaining metadata about storage. e.g. files() is used to obtain the files backing storage. rawsize() is to quickly compute the size of tracked revisions without resolving their fulltext. Code in upgrade and stream clone make heavy use of these methods. The existing APIs are generic and don't necessarily have the specialization that we need going forward. For example, files() doesn't distinguish between exclusive storage and shared storage. This makes stream clone difficult to implement when e.g. there may be a single file backing storage for multiple tracked paths. It also makes reporting difficult, as we don't know how many bytes are actually used by storage since we can't easily identify shared files. This commit implements a new method for obtaining storage metadata. It is designed to accept arguments specifying what metadata to request and to return a dict with those fields populated. We /could/ make each of these attributes a separate method. But this is a specialized API and I'm trying to avoid method bloat on the interfaces. There is also the possibility that certain callers will want to obtain multiple fields in different combinations and some backends may have performance issues obtaining all that data via separate method calls. Simple storage integration tests have been added. For now, we assume fields can't be "None" (ignoring the interface documentation). We can revisit this later. Differential Revision: https://phab.mercurial-scm.org/D4747
Siddharth Agarwal - - Load All Authors

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Siddharth Agarwal
thirdparty: vendor attrs...
 r34398 The MIT License (MIT)
Copyright (c) 2015 Hynek Schlawack
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.