$ git clone -n https://src.fedoraproject.org/rpms/rust-ivf.git /var/lib/mock/f40-build-2641997-66441/root/chroot_tmpdir/scmroot/rust-ivf
Cloning into '/var/lib/mock/f40-build-2641997-66441/root/chroot_tmpdir/scmroot/rust-ivf'...
$ git fetch origin 263e8c4050459e02492a16a51495f1e53f6dabb3:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-ivf
 * [new ref]         263e8c4050459e02492a16a51495f1e53f6dabb3 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 263e8c4 Update to version 0.1.3; Fixes RHBZ#2257204