$ git clone -n https://src.fedoraproject.org/rpms/m1n1.git /var/lib/mock/f42-build-side-110848-59123263-6571244/root/chroot_tmpdir/scmroot/m1n1
Cloning into '/var/lib/mock/f42-build-side-110848-59123263-6571244/root/chroot_tmpdir/scmroot/m1n1'...
$ git fetch origin 7ee661807381fb04c5d85cb8ff1992990ecb5467:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/m1n1
 * [new ref]         7ee661807381fb04c5d85cb8ff1992990ecb5467 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7ee6618 Install /etc/m1n1.conf