Summary:
Add blackbox logging of syncing to or from the commit cloud workspace,
including which changes are being submitted.
Also log when obsmarker fixup happens in blackbox.
Reviewed By: quark-zju
Differential Revision: D16961281
fbshipit-source-id: 0d0f675d77ab3446198703b31eea940dae3bdd85
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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