$ git clone -n https://src.fedoraproject.org/rpms/erlang-mqtree.git /var/lib/mock/f40-build-1817397-24911/root/chroot_tmpdir/scmroot/erlang-mqtree
Cloning into '/var/lib/mock/f40-build-1817397-24911/root/chroot_tmpdir/scmroot/erlang-mqtree'...
$ git fetch origin 8c519edc83f098479ec80a49fcb5152c744503e3:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/erlang-mqtree
 * [new ref]         8c519edc83f098479ec80a49fcb5152c744503e3 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8c519ed mqtree ver. 1.0.17