$ git clone -n https://src.fedoraproject.org/rpms/rust-streaming-iterator.git /var/lib/mock/f45-build-45189-821/root/chroot_tmpdir/scmroot/rust-streaming-iterator
Cloning into '/var/lib/mock/f45-build-45189-821/root/chroot_tmpdir/scmroot/rust-streaming-iterator'...
$ git fetch origin ec46c68a8fbce4d3fa4434ce4130572f200b001a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-streaming-iterator
 * [new ref]         ec46c68a8fbce4d3fa4434ce4130572f200b001a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ec46c68 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild