branchcache: add a "pure topological head" fast path
In a narrow but actually quick common case, all topological heads are all on
the same branch and all open. In this case, computing the branch map is very
simple. We can quickly detect situation where this situation will not change.
So we update the V3 format to be able to express this situation and upgrade the
update code to detect we remains in that mode.
The branch cache is populated with the actual value when the branch map is
accessed, but the update_disk method can do the update without needing to
populate it.
#!/bin/bash
set -e
set -u
# Find the python3 setup that would run pytype
PYTYPE=`which pytype`
PYTHON3=`head -n1 ${PYTYPE} | sed -s 's/#!//'`
# Existing stubs that pytype processes live here
TYPESHED=$(${PYTHON3} -c "import pytype; print(pytype.__path__[0])")/typeshed/stubs
HG_STUBS=${TYPESHED}/mercurial
echo "Patching typeshed at $HG_STUBS"
rm -rf ${HG_STUBS}
mkdir -p ${HG_STUBS}
cat > ${HG_STUBS}/METADATA.toml <<EOF
version = "0.1"
EOF
mkdir -p ${HG_STUBS}/mercurial/cext ${HG_STUBS}/mercurial/thirdparty/attr
touch ${HG_STUBS}/mercurial/__init__.pyi
touch ${HG_STUBS}/mercurial/cext/__init__.pyi
touch ${HG_STUBS}/mercurial/thirdparty/__init__.pyi
ln -sf $(hg root)/mercurial/cext/*.{pyi,typed} \
${HG_STUBS}/mercurial/cext
ln -sf $(hg root)/mercurial/thirdparty/attr/*.{pyi,typed} \
${HG_STUBS}/mercurial/thirdparty/attr