$ git clone -n https://src.fedoraproject.org/rpms/rust-uu_vdir.git /var/lib/mock/f42-build-3251836-41222/root/chroot_tmpdir/scmroot/rust-uu_vdir
Cloning into '/var/lib/mock/f42-build-3251836-41222/root/chroot_tmpdir/scmroot/rust-uu_vdir'...
$ git fetch origin b5f50265eeab2cd32c51fdd778e05929f63351c1:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-uu_vdir
 * [new ref]         b5f50265eeab2cd32c51fdd778e05929f63351c1 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b5f5026 Rebuilt for https://fedoraproject.org/wiki/Fedora_42_Mass_Rebuild