$ git clone -n https://src.fedoraproject.org/rpms/jpegxl.git /var/lib/mock/f41-build-839142-160018/root/chroot_tmpdir/scmroot/jpegxl
Cloning into '/var/lib/mock/f41-build-839142-160018/root/chroot_tmpdir/scmroot/jpegxl'...
$ git fetch origin 19f643135c6ca39617c1f5fbd89b2f4b7bc100b2:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/jpegxl
 * [new ref]         19f643135c6ca39617c1f5fbd89b2f4b7bc100b2 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 19f6431 Rebuilt for https://fedoraproject.org/wiki/Fedora_41_Mass_Rebuild