$ git clone -n https://src.fedoraproject.org/rpms/plexus-cipher.git /var/lib/mock/f42-build-3364892-45045/root/chroot_tmpdir/scmroot/plexus-cipher
Cloning into '/var/lib/mock/f42-build-3364892-45045/root/chroot_tmpdir/scmroot/plexus-cipher'...
$ git fetch origin a37edc1ad80ac8fed679e32cbd4e22ac3ff00f74:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/plexus-cipher
 * [new ref]         a37edc1ad80ac8fed679e32cbd4e22ac3ff00f74 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a37edc1 Remove javadoc subpackage