$ git clone -n https://src.fedoraproject.org/rpms/rust-timerfd.git /var/lib/mock/f45-build-45450-823/root/chroot_tmpdir/scmroot/rust-timerfd
Cloning into '/var/lib/mock/f45-build-45450-823/root/chroot_tmpdir/scmroot/rust-timerfd'...
$ git fetch origin 99d6ac9f4f83b23a429ba26f89bbe66e1efaa1b3:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-timerfd
 * [new ref]         99d6ac9f4f83b23a429ba26f89bbe66e1efaa1b3 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 99d6ac9 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild