$ git clone -n https://src.fedoraproject.org/rpms/vips.git /var/lib/mock/f42-build-868925-176343/root/chroot_tmpdir/scmroot/vips
Cloning into '/var/lib/mock/f42-build-868925-176343/root/chroot_tmpdir/scmroot/vips'...
$ git fetch origin 81c9afaee7b9c7bb2529fe38f48c28b865cb786c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/vips
 * [new ref]         81c9afaee7b9c7bb2529fe38f48c28b865cb786c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 81c9afa Rebuild for jpegxl (libjxl) 0.11.1