# HG changeset patch
# User Georges Racinet <georges.racinet@octobus.net>
# Date 1648843172 -7200
# Node ID 6ae0077e416e7a2c779a71a7d93b3d6c8c2340a4
# Parent  d2ec9ab1694e53d1b65145a4185e1a88cf8dbdc9
state: allow to unvendor cbor

This makes evolve fallback to an externally provided version of
the `cbor` library, which in turns allows distributions such as Debian
not to include the vendored `cbor.py` and rely on their own provided
version instead.

The price to pay is the immediate attempt to import the vendored `cbor`,
to circumvent that hgdemandimport never raises `ImportError` immediately.

diff -r d2ec9ab1694e -r 6ae0077e416e hgext3rd/evolve/state.py
--- a/hgext3rd/evolve/state.py	Sun Mar 06 17:44:11 2022 +0300
+++ b/hgext3rd/evolve/state.py	Fri Apr 01 21:59:32 2022 +0200
@@ -19,7 +19,14 @@
 import errno
 import struct
 
-from .thirdparty import cbor
+# use the vendored cbor if available, and if not, try and
+# use an externally provided one (would typically be the case
+# with distribution packages)
+try:
+    from .thirdparty import cbor
+    cbor.__doc__  # trigger ImportError immediately
+except ImportError:
+    import cbor
 
 from mercurial import (
     error,