fold: replace a compat condition with a less specific proxy
If `scmutil.cleanupnodes()` is overridden, the check in
`scmutil.cleanupnodes.__code__.co_varnames` will fail. Let's use a
less specific proxy for that condition so extensions are safely
override `scmutil.cleanupnodes()`. I picked `util.safehasattr(scmutil,
'nullrev')` as the proxy. That basically checks for Mercurial commit
d739f423bf06, which is two commits later than the commit we actually
care about.
# setup config and various utility to test new heads checks on push
. $TESTDIR/testlib/common.sh
cat >> $HGRCPATH <<EOF
[ui]
# simpler log output
logtemplate ="{node|short} ({phase}): {desc}\n"
[phases]
# non publishing server
publish=False
[extensions]
# we need to strip some changeset for some test cases
strip=
evolve=
EOF
setuprepos() {
echo creating basic server and client repo
hg init server
cd server
mkcommit root
hg phase --public .
mkcommit A0
cd ..
hg clone server client
}