$ git clone -n https://src.fedoraproject.org/rpms/mkbootdisk.git /var/lib/mock/f41-build-1544694-23938/root/chroot_tmpdir/scmroot/mkbootdisk
Cloning into '/var/lib/mock/f41-build-1544694-23938/root/chroot_tmpdir/scmroot/mkbootdisk'...
$ git fetch origin 2e90c988a2d2da7db0f5db1d38ae9fa78564cc2e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/mkbootdisk
 * [new ref]         2e90c988a2d2da7db0f5db1d38ae9fa78564cc2e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2e90c98 Eliminate use of obsolete %patchN syntax (#2283636)