$ git clone -n https://src.fedoraproject.org/rpms/gimp.git /var/lib/mock/f40-build-2696082-69556/root/chroot_tmpdir/scmroot/gimp
Cloning into '/var/lib/mock/f40-build-2696082-69556/root/chroot_tmpdir/scmroot/gimp'...
$ git fetch origin 36eeec7a9aec838d47a30a7cc929d38a75d9c76c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gimp
 * [new ref]         36eeec7a9aec838d47a30a7cc929d38a75d9c76c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 36eeec7 Rebuild for jpegxl (libjxl) 0.10.2