$ git clone -n https://src.fedoraproject.org/rpms/rust-rusty-forkfork.git /var/lib/mock/f45-build-44622-815/root/chroot_tmpdir/scmroot/rust-rusty-forkfork
Cloning into '/var/lib/mock/f45-build-44622-815/root/chroot_tmpdir/scmroot/rust-rusty-forkfork'...
$ git fetch origin 9f60851244e57af0a232568bfe3639e0f0766969:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-rusty-forkfork
 * [new ref]         9f60851244e57af0a232568bfe3639e0f0766969 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9f60851 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild