$ git clone -n https://src.fedoraproject.org/rpms/rust-predicates-tree.git /var/lib/mock/f45-build-43993-809/root/chroot_tmpdir/scmroot/rust-predicates-tree
Cloning into '/var/lib/mock/f45-build-43993-809/root/chroot_tmpdir/scmroot/rust-predicates-tree'...
$ git fetch origin 94d7c1a10896e7eb9f69cb38ffcf2912a4142c14:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-predicates-tree
 * [new ref]         94d7c1a10896e7eb9f69cb38ffcf2912a4142c14 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 94d7c1a Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild