$ git clone -n https://src.fedoraproject.org/rpms/rust-derive-new.git /var/lib/mock/f45-build-41235-780/root/chroot_tmpdir/scmroot/rust-derive-new
Cloning into '/var/lib/mock/f45-build-41235-780/root/chroot_tmpdir/scmroot/rust-derive-new'...
$ git fetch origin 3b89d128b7388e6bd4e022840080041c6f8ce4fb:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-derive-new
 * [new ref]         3b89d128b7388e6bd4e022840080041c6f8ce4fb -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3b89d12 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild