$ git clone -n https://src.fedoraproject.org/rpms/rust-derive_builder_macro.git /var/lib/mock/f45-build-41243-780/root/chroot_tmpdir/scmroot/rust-derive_builder_macro
Cloning into '/var/lib/mock/f45-build-41243-780/root/chroot_tmpdir/scmroot/rust-derive_builder_macro'...
$ git fetch origin e1b801189c62478dc3380a04e948033125d6fb2c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-derive_builder_macro
 * [new ref]         e1b801189c62478dc3380a04e948033125d6fb2c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e1b8011 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild