$ git clone -n https://src.fedoraproject.org/rpms/rust-sponge-cursor.git /var/lib/mock/f45-build-45183-821/root/chroot_tmpdir/scmroot/rust-sponge-cursor
Cloning into '/var/lib/mock/f45-build-45183-821/root/chroot_tmpdir/scmroot/rust-sponge-cursor'...
$ git fetch origin 6f79b70a23e39bb5967de9b29f5bcd62ecf5298a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-sponge-cursor
 * [new ref]         6f79b70a23e39bb5967de9b29f5bcd62ecf5298a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6f79b70 Initial package (close RHBZ#2498026)