$ git clone -n https://src.fedoraproject.org/rpms/htmltest.git /var/lib/mock/f40-build-2158841-50939/root/chroot_tmpdir/scmroot/htmltest
Cloning into '/var/lib/mock/f40-build-2158841-50939/root/chroot_tmpdir/scmroot/htmltest'...
$ git fetch origin cb194616db2380173bbd7621a99b5c6025d6b408:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/htmltest
 * [new ref]         cb194616db2380173bbd7621a99b5c6025d6b408 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at cb19461 Backport patch to use govcr 4