$ git clone -n https://src.fedoraproject.org/rpms/jss.git /var/lib/mock/f41-build-854431-166865/root/chroot_tmpdir/scmroot/jss
Cloning into '/var/lib/mock/f41-build-854431-166865/root/chroot_tmpdir/scmroot/jss'...
$ git fetch origin bfa1d7c37aa0e8a43b6e6b6b5ea4ff42f6ec23e5:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/jss
 * [new ref]         bfa1d7c37aa0e8a43b6e6b6b5ea4ff42f6ec23e5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at bfa1d7c Really build against java-21