$ git clone -n https://src.fedoraproject.org/rpms/rust-sha2.git /var/lib/mock/f45-build-44904-819/root/chroot_tmpdir/scmroot/rust-sha2
Cloning into '/var/lib/mock/f45-build-44904-819/root/chroot_tmpdir/scmroot/rust-sha2'...
$ git fetch origin f785a03a2783f647f23d5843c28c43e1c26e95c3:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-sha2
 * [new ref]         f785a03a2783f647f23d5843c28c43e1c26e95c3 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f785a03 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild