$ git clone -n https://src.fedoraproject.org/rpms/rust-tiny-dfr.git /var/lib/mock/f41-build-side-1-2968047-35816/root/chroot_tmpdir/scmroot/rust-tiny-dfr
Cloning into '/var/lib/mock/f41-build-side-1-2968047-35816/root/chroot_tmpdir/scmroot/rust-tiny-dfr'...
$ git fetch origin a19b83d90a79964fcb74d198bec9e280d8cd4c05:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-tiny-dfr
 * [new ref]         a19b83d90a79964fcb74d198bec9e280d8cd4c05 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a19b83d Update to 0.3.2; Fixes: RHBZ#2293764