py3: fix sorting of obsolete markers when building bundle
Last item of marker tuple (parents) is either None or tuple. Comparison
thus fails on Python 3 with:
TypeError: '<' not supported between instances of 'tuple' and 'NoneType'
Fixing this by coercing None to the empty tuple when sorting markers in
exchange._getbundleobsmarkerpart().
--- a/mercurial/exchange.py Thu Oct 10 04:34:58 2019 +0200
+++ b/mercurial/exchange.py Thu Oct 10 20:27:34 2019 +0200
@@ -2567,7 +2567,8 @@
heads = repo.heads()
subset = [c.node() for c in repo.set(b'::%ln', heads)]
markers = repo.obsstore.relevantmarkers(subset)
- markers = sorted(markers)
+ # last item of marker tuple ('parents') may be None or a tuple
+ markers = sorted(markers, key=lambda m: m[:-1] + (m[-1] or (),))
bundle2.buildobsmarkerspart(bundler, markers)