$ git clone -n https://src.fedoraproject.org/rpms/kf6-kimageformats.git /var/lib/mock/f40-build-2410817-60560/root/chroot_tmpdir/scmroot/kf6-kimageformats
Cloning into '/var/lib/mock/f40-build-2410817-60560/root/chroot_tmpdir/scmroot/kf6-kimageformats'...
$ git fetch origin 2bd98c38d89f5a04e98335fe93cb0609eff57aae:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kf6-kimageformats
 * [new ref]         2bd98c38d89f5a04e98335fe93cb0609eff57aae -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2bd98c3 Rebuild for jpegxl (libjxl) 0.9.2 with soname bump