$ git clone -n https://src.fedoraproject.org/rpms/mkbootdisk.git /var/lib/mock/f41-build-3155498-40677/root/chroot_tmpdir/scmroot/mkbootdisk
Cloning into '/var/lib/mock/f41-build-3155498-40677/root/chroot_tmpdir/scmroot/mkbootdisk'...
$ git fetch origin d4ce75e58bec33d3d8f79c0078b4c1480aa65abe:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/mkbootdisk
 * [new ref]         d4ce75e58bec33d3d8f79c0078b4c1480aa65abe -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d4ce75e Made package noarch