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.
MEDIATYPE=application/mercurial-exp-framing-0006
sendhttpraw() {
hg --verbose debugwireproto --peer raw http://$LOCALIP:$HGPORT/
}
cat > dummycommands.py << EOF
from mercurial import (
wireprototypes,
wireprotov1server,
)
@wireprotov1server.wireprotocommand(b'customreadonly', permission=b'pull')
def customreadonlyv1(repo, proto):
return wireprototypes.bytesresponse(b'customreadonly bytes response')
@wireprotov1server.wireprotocommand(b'customreadwrite', permission=b'push')
def customreadwrite(repo, proto):
return wireprototypes.bytesresponse(b'customreadwrite bytes response')
EOF
cat >> $HGRCPATH << EOF
[extensions]
drawdag = $TESTDIR/drawdag.py
EOF
enabledummycommands() {
cat >> $HGRCPATH << EOF
[extensions]
dummycommands = $TESTTMP/dummycommands.py
EOF
}