$ git clone -n https://src.fedoraproject.org/rpms/plexus-archiver.git /var/lib/mock/f40-build-2141640-50851/root/chroot_tmpdir/scmroot/plexus-archiver
Cloning into '/var/lib/mock/f40-build-2141640-50851/root/chroot_tmpdir/scmroot/plexus-archiver'...
$ git fetch origin 37953e8d34eb4b7203ea1e8ed45d1dd5c844c47e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/plexus-archiver
 * [new ref]         37953e8d34eb4b7203ea1e8ed45d1dd5c844c47e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 37953e8 Update javapackages test plan to f40