$ git clone -n https://src.fedoraproject.org/rpms/rust-speedate.git /var/lib/mock/f38-build-side-43-rust-devel-1422328-31465/root/chroot_tmpdir/scmroot/rust-speedate
Cloning into '/var/lib/mock/f38-build-side-43-rust-devel-1422328-31465/root/chroot_tmpdir/scmroot/rust-speedate'...
$ git fetch origin 7a9b2a30308086f487e0ec412340b7076ff7b23d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-speedate
 * [new ref]         7a9b2a30308086f487e0ec412340b7076ff7b23d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7a9b2a3 Initial package. Fixes rhbz#2238103.