$ git clone -n https://src.fedoraproject.org/rpms/rust-der.git /var/lib/mock/f40-build-2651204-66880/root/chroot_tmpdir/scmroot/rust-der
Cloning into '/var/lib/mock/f40-build-2651204-66880/root/chroot_tmpdir/scmroot/rust-der'...
$ git fetch origin bbc468bfe9a5fc34bd764d1332d2a2b892a02a71:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-der
 * [new ref]         bbc468bfe9a5fc34bd764d1332d2a2b892a02a71 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at bbc468b Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild