$ git clone -n https://src.fedoraproject.org/rpms/jflex.git /var/lib/mock/f40-build-2530236-61829/root/chroot_tmpdir/scmroot/jflex
Cloning into '/var/lib/mock/f40-build-2530236-61829/root/chroot_tmpdir/scmroot/jflex'...
$ git fetch origin 435b716f0e4e5a7c7fda2eee286773bb7ad19e60:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/jflex
 * [new ref]         435b716f0e4e5a7c7fda2eee286773bb7ad19e60 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 435b716 Rebuilt for java-21-openjdk as system jdk