$ git clone -n https://src.fedoraproject.org/rpms/rust-num0.3.git /var/lib/mock/f45-build-43486-803/root/chroot_tmpdir/scmroot/rust-num0.3
Cloning into '/var/lib/mock/f45-build-43486-803/root/chroot_tmpdir/scmroot/rust-num0.3'...
$ git fetch origin db2a1ef4e428c50498f297504388fc7aeacfc1ad:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-num0.3
 * [new ref]         db2a1ef4e428c50498f297504388fc7aeacfc1ad -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at db2a1ef Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild