$ git clone -n https://src.fedoraproject.org/rpms/rust-derive-into-owned.git /var/lib/mock/f45-build-41230-780/root/chroot_tmpdir/scmroot/rust-derive-into-owned
Cloning into '/var/lib/mock/f45-build-41230-780/root/chroot_tmpdir/scmroot/rust-derive-into-owned'...
$ git fetch origin a9efb1ecacd1f9a8362bbd9d83fa87165032ebe7:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-derive-into-owned
 * [new ref]         a9efb1ecacd1f9a8362bbd9d83fa87165032ebe7 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a9efb1e Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild