$ git clone -n https://src.fedoraproject.org/rpms/rust-multipart-rs.git /var/lib/mock/f45-build-43289-801/root/chroot_tmpdir/scmroot/rust-multipart-rs
Cloning into '/var/lib/mock/f45-build-43289-801/root/chroot_tmpdir/scmroot/rust-multipart-rs'...
$ git fetch origin ef2b4787552f0b0a6e2438a60d989a5758e7e265:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-multipart-rs
 * [new ref]         ef2b4787552f0b0a6e2438a60d989a5758e7e265 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ef2b478 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild