$ git clone -n https://src.fedoraproject.org/rpms/jpegxl.git /var/lib/mock/f40-build-2392644-60530/root/chroot_tmpdir/scmroot/jpegxl
Cloning into '/var/lib/mock/f40-build-2392644-60530/root/chroot_tmpdir/scmroot/jpegxl'...
$ git fetch origin bf363763c4a00645a5a23ba2d39bad49ae6af77b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/jpegxl
 * [new ref]         bf363763c4a00645a5a23ba2d39bad49ae6af77b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at bf36376 Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild