Summary:
It is somewhat difficult to fetch the raw entry on the p1 side in the Rust
Manifests. These entries are used to write deltas to revlogs or to datapacks.
Reviewed By: xavierd
Differential Revision: D17143551
fbshipit-source-id: 6624116324664354d199d5f6ac55712c8ed29b9d
Any native code (C/C++/Rust) that Mercurial (either core or extensions)
depends on should go here. Python code, or native code that depends on
Python code (e.g. #include <Python.h> or use cpython) is disallowed.
As we start to convert more of Mercurial into Rust, and write new paths
entrirely in native code, we'll want to limit our dependency on Python, which is
why this barrier exists.
See also hgext/extlib/README.md, mercurial/cext/README.mb.
How do I choose between lib and extlib (and cext)?
If your code is native and doesn't depend on Python (awesome!), it goes here.
Otherwise, put it in hgext/extlib (if it's only used by extensions) or
mercurial/cext (if it's used by extensions or core).
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