$ git clone -n https://src.fedoraproject.org/rpms/rust-utf16_iter.git /var/lib/mock/f45-build-46009-830/root/chroot_tmpdir/scmroot/rust-utf16_iter
Cloning into '/var/lib/mock/f45-build-46009-830/root/chroot_tmpdir/scmroot/rust-utf16_iter'...
$ git fetch origin ef172e10ff5a1f55615ca74fb62a53dc2ca66824:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-utf16_iter
 * [new ref]         ef172e10ff5a1f55615ca74fb62a53dc2ca66824 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ef172e1 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild