$ git clone -n https://src.fedoraproject.org/rpms/krdp.git /var/lib/mock/f41-build-824855-154234/root/chroot_tmpdir/scmroot/krdp
Cloning into '/var/lib/mock/f41-build-824855-154234/root/chroot_tmpdir/scmroot/krdp'...
$ git fetch origin 21bb84721c92b2b5ad53fa5bce50896f15cfbe66:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/krdp
 * [new ref]         21bb84721c92b2b5ad53fa5bce50896f15cfbe66 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 21bb847 rebuild