$ git clone -n https://src.fedoraproject.org/rpms/rust-piper.git /var/lib/mock/f45-build-43859-807/root/chroot_tmpdir/scmroot/rust-piper
Cloning into '/var/lib/mock/f45-build-43859-807/root/chroot_tmpdir/scmroot/rust-piper'...
$ git fetch origin 0aef3ffa92bac152218296647f1bfd7c83b9fe00:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-piper
 * [new ref]         0aef3ffa92bac152218296647f1bfd7c83b9fe00 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 0aef3ff Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild