branchcache: skip entries that are topological heads in the on disk file
In the majority of cases, topological heads are also branch heads. We have
efficient way to get the topological heads and efficient way to retrieve
their branch information. So there is little value in putting them in the branch
cache file explicitly. On the contrary, writing them explicitly tend to create
very large cache file that are inefficient to read and update.
So the branch cache v3 format is no longer including them. This changeset focus
on the format aspect and have no focus on the performance aspect. We will cover
that later.
# Declare Windows-specific requirements for generating
# the compiled (frozen) set of requirements in
# ./requirements-windows-py3.txt.
# If run on Windows, it may be necessary to run dos2unix
# on the output file to replace any CRLF newlines with LF.
docutils
dulwich
# Needed by the release note tooling
fuzzywuzzy
keyring
pygit2
pygments
# Needed by the phabricator tests
pytest-vcr
# Need to list explicitly so dependency gets pulled in when
# not running on Windows.
pywin32-ctypes
windows-curses