$ git clone -n https://src.fedoraproject.org/rpms/rust-picky-test-data.git /var/lib/mock/f45-build-43849-807/root/chroot_tmpdir/scmroot/rust-picky-test-data
Cloning into '/var/lib/mock/f45-build-43849-807/root/chroot_tmpdir/scmroot/rust-picky-test-data'...
$ git fetch origin f28b1c2da746604421925004effe4dd65eaca970:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-picky-test-data
 * [new ref]         f28b1c2da746604421925004effe4dd65eaca970 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f28b1c2 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild