$ git clone -n https://src.fedoraproject.org/rpms/erlang-mqtree.git /var/lib/mock/f41-build-811294-147311/root/chroot_tmpdir/scmroot/erlang-mqtree
Cloning into '/var/lib/mock/f41-build-811294-147311/root/chroot_tmpdir/scmroot/erlang-mqtree'...
$ git fetch origin 2db796c0f65936ed298057199fb23fa1a06a01a2:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/erlang-mqtree
 * [new ref]         2db796c0f65936ed298057199fb23fa1a06a01a2 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2db796c More macros