Summary:
In some rare situation, the packs directory may not exist, the PackStore
shouldn't fail in these case, it should just act as if nothing is present in
it.
Reviewed By: quark-zju
Differential Revision: D16794079
fbshipit-source-id: e33bd55e0f378b9be58831a85ec822221af7a9bc
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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