$ git clone -n https://src.fedoraproject.org/rpms/rust-proc-macro-error.git /var/lib/mock/f45-build-44005-809/root/chroot_tmpdir/scmroot/rust-proc-macro-error
Cloning into '/var/lib/mock/f45-build-44005-809/root/chroot_tmpdir/scmroot/rust-proc-macro-error'...
$ git fetch origin 99525de4fda6b44f4bbda90fcc762213a373f930:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-proc-macro-error
 * [new ref]         99525de4fda6b44f4bbda90fcc762213a373f930 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 99525de Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild