/usr/share/pki/upgrade/10.0.1/01-AddJniJarDir is in pki-base 10.6.0-1ubuntu2.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
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#     Endi S. Dewata <edewata@redhat.com>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; version 2 of the License.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License along
# with this program; if not, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
#
# Copyright (C) 2013 Red Hat, Inc.
# All rights reserved.
#
from __future__ import absolute_import
import os
import pki
import pki.upgrade
class AddJniJarDir(pki.upgrade.PKIUpgradeScriptlet):
    def __init__(self):
        super(AddJniJarDir, self).__init__()
        self.message = 'Add JNI_JAR_DIR into pki.conf'
    def upgrade_system(self):
        # read pki.conf.default
        default_conf = pki.PropertyFile(
            os.path.join(pki.SHARE_DIR, 'etc', 'pki.conf'))
        default_conf.read()
        default_path = default_conf.get('JNI_JAR_DIR')
        filename = os.path.join(pki.CONF_DIR, 'pki.conf')
        self.backup(filename)
        # read pki.conf
        conf = pki.PropertyFile(filename)
        conf.read()
        # find JNI_JAR_DIR
        if conf.index('JNI_JAR_DIR') >= 0:
            # already exists
            conf.set('JNI_JAR_DIR', default_path)
            conf.write()
            return
        # find RESTEASY_LIB
        index = conf.index('RESTEASY_LIB')
        # insert JNI_JAR_DIR after RESTEASY_LIB
        index = index + 1
        conf.insert_line(index, '')
        index = index + 1
        conf.insert_line(index, '# JNI jar file location')
        index = index + 1
        conf.set('JNI_JAR_DIR', default_path, index=index)
        # update pki.conf
        conf.write()
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