$ git clone -n https://src.fedoraproject.org/rpms/rust-utf8-zero.git /var/lib/mock/f45-build-45993-830/root/chroot_tmpdir/scmroot/rust-utf8-zero
Cloning into '/var/lib/mock/f45-build-45993-830/root/chroot_tmpdir/scmroot/rust-utf8-zero'...
$ git fetch origin 0bfaa3e58fb841a6c8a1efb1690f7191a218b377:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-utf8-zero
 * [new ref]         0bfaa3e58fb841a6c8a1efb1690f7191a218b377 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 0bfaa3e Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild