$ git clone -n https://src.fedoraproject.org/rpms/rust-num-bigint0.3.git /var/lib/mock/f45-build-43460-803/root/chroot_tmpdir/scmroot/rust-num-bigint0.3
Cloning into '/var/lib/mock/f45-build-43460-803/root/chroot_tmpdir/scmroot/rust-num-bigint0.3'...
$ git fetch origin 35bf381fdb975769c1708ce37ab0e61a439ed9b7:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-num-bigint0.3
 * [new ref]         35bf381fdb975769c1708ce37ab0e61a439ed9b7 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 35bf381 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild