$ git clone -n https://src.fedoraproject.org/rpms/janino.git /var/lib/mock/f41-build-1182650-21975/root/chroot_tmpdir/scmroot/janino
Cloning into '/var/lib/mock/f41-build-1182650-21975/root/chroot_tmpdir/scmroot/janino'...
$ git fetch origin dcb498903438c241fbe1211db7bf4b206ef3d2ba:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/janino
 * [new ref]         dcb498903438c241fbe1211db7bf4b206ef3d2ba -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at dcb4989 Set Java source/target to 1.8 to build with JDK 21