#!/bin/bash
#Preupgrade assistant performs system upgradability assessment
#and gathers information required for successful operating system upgrade.
#Copyright (C) 2013 Red Hat Inc.
#Miroslav Lichvar <mlichvar@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, either version 3 of the License, or
#(at your option) any later version.
#
#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, see <http://www.gnu.org/licenses/>.
. /usr/share/preupgrade/common.sh
check_applies_to "ntpdate"
check_rpm_to "" "cmp"
COMPONENT="ntpdate"
#END GENERATED SECTION

check_root

# The RHEL6 ntp and ntpdate configuration can be used without changes on RHEL7.
# Some configuration files are not copied to the cleanconf directory
# automatically by other scripts as they are marked with %verify(not md5 size
# mtime) or are not tracked by rpm at all. Check for such files in this script.

save_files=""

# Check if ntp.conf was modified, but ignore servers added by dhclient.

ntpconf=/etc/ntp.conf

if [ -f $ntpconf ] && \
	! grep -v '^server.*#.*dhclient' $ntpconf | \
            cmp default.ntp.conf - &> /dev/null; then
    save_files+=$ntpconf
fi

# Check if step-tickers was modified.

steptickers=/etc/ntp/step-tickers

if [ -f $steptickers ] && \
        ! cmp default.step-tickers $steptickers &> /dev/null; then
    save_files+=" $steptickers"
fi

# Find Autokey files

save_files+=" $(find /etc/ntp/crypto -type f -not -name 'pw' -or -type l)"

# If no files were found, there is nothing to do.
[[ $save_files == */* ]] || exit_pass

cat > $SOLUTION_FILE <<-EOF
The CentOS6 ntp and ntpdate configuration can be used without changes on CentOS7.
The following configuration files are modified, but not tracked by rpm,
or not included in the packages:

EOF

# Backup the files.

save_dir="$VALUE_TMP_PREUPGRADE/cleanconf"

for f in $save_files; do
    dir_name=$(dirname $f)
    mkdir -p "$save_dir/$dir_name" || exit_error

    # Make sure keys are not world readable
    if [ "$dir_name" = "/etc/ntp/crypto" ]; then
         chmod 750 "$save_dir/$dir_name" || exit_error
         chown root:ntp "$save_dir/$dir_name" || exit_error
    fi

    cp -aP $f "$save_dir/$f" || exit_error
    echo $f >> $SOLUTION_FILE
done

cat >> $SOLUTION_FILE <<-EOF

The files have been saved to /root/preupgrade/cleanconf.
Configuration files tracked by rpm are saved to the same directory by rule
"Store modified config files for packages with unchanged version".

Please note that the NTP package installed by default in CentOS7 is chrony.
To switch back to ntp, run "yum install ntp" and "yum remove chrony".
EOF

exit_informational
