$ git clone -n https://src.fedoraproject.org/rpms/rust-uu_dir.git /var/lib/mock/f42-build-3251806-41222/root/chroot_tmpdir/scmroot/rust-uu_dir
Cloning into '/var/lib/mock/f42-build-3251806-41222/root/chroot_tmpdir/scmroot/rust-uu_dir'...
$ git fetch origin 284c1996de08b6b974675b803323f0c538c748a5:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-uu_dir
 * [new ref]         284c1996de08b6b974675b803323f0c538c748a5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 284c199 Rebuilt for https://fedoraproject.org/wiki/Fedora_42_Mass_Rebuild