$ git clone -n https://src.fedoraproject.org/rpms/rust-uu_head.git /var/lib/mock/f40-build-779955-130567/root/chroot_tmpdir/scmroot/rust-uu_head
Cloning into '/var/lib/mock/f40-build-779955-130567/root/chroot_tmpdir/scmroot/rust-uu_head'...
$ git fetch origin df7d263ef0d58aecd3c514e8906fde0b303d29dd:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-uu_head
 * [new ref]         df7d263ef0d58aecd3c514e8906fde0b303d29dd -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at df7d263 Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild