$ git clone -n https://src.fedoraproject.org/rpms/rust-want.git /var/lib/mock/f40-build-2328395-58867/root/chroot_tmpdir/scmroot/rust-want
Cloning into '/var/lib/mock/f40-build-2328395-58867/root/chroot_tmpdir/scmroot/rust-want'...
$ git fetch origin 20ae557a20b8c0bb2132195315f0c6ae8f46e5d2:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-want
 * [new ref]         20ae557a20b8c0bb2132195315f0c6ae8f46e5d2 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 20ae557 Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild