$ git clone -n https://src.fedoraproject.org/rpms/rust-num-modular.git /var/lib/mock/f45-build-43493-803/root/chroot_tmpdir/scmroot/rust-num-modular
Cloning into '/var/lib/mock/f45-build-43493-803/root/chroot_tmpdir/scmroot/rust-num-modular'...
$ git fetch origin 2586ebd4e27b640819b9052443277e7d31b43653:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-num-modular
 * [new ref]         2586ebd4e27b640819b9052443277e7d31b43653 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2586ebd Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild