$ git clone -n https://src.fedoraproject.org/rpms/jflex.git /var/lib/mock/f38-build-side-42-init-devel-722162-27298/root/chroot_tmpdir/scmroot/jflex
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-722162-27298/root/chroot_tmpdir/scmroot/jflex'...
$ git fetch origin 19308eb5feadb1f2e1567e2b9ecae123299225fb:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/jflex
 * [new ref]         19308eb5feadb1f2e1567e2b9ecae123299225fb -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 19308eb Rebuilt for https://fedoraproject.org/wiki/Fedora_38_Mass_Rebuild