$ git clone -n https://src.fedoraproject.org/rpms/rust-num-complex.git /var/lib/mock/f45-build-43450-803/root/chroot_tmpdir/scmroot/rust-num-complex
Cloning into '/var/lib/mock/f45-build-43450-803/root/chroot_tmpdir/scmroot/rust-num-complex'...
$ git fetch origin b6427b4591cec6b311ae92a97fb783248b129b04:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-num-complex
 * [new ref]         b6427b4591cec6b311ae92a97fb783248b129b04 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b6427b4 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild