$ git clone -n https://src.fedoraproject.org/rpms/md4c.git /var/lib/mock/f40-build-797106-141065/root/chroot_tmpdir/scmroot/md4c
Cloning into '/var/lib/mock/f40-build-797106-141065/root/chroot_tmpdir/scmroot/md4c'...
$ git fetch origin 66f53097635e94c116c7c874a7c8e6cab3c3961e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/md4c
 * [new ref]         66f53097635e94c116c7c874a7c8e6cab3c3961e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 66f5309 Update to 0.5.1