#!/bin/bash

# bkup_rpm.sh
# backup the current list of rpms for precautionary rollback
# refined:  July 3, 2014

bkup_dir="/root/RPMBUP/"

savenum=9

datestring=`date +%Y%m%d | tr '\n|\r' ' ' | sed 's/\s$//'`

# create the backup directory if it doesn't already exist
# if it does exist, do nothing
mkdir -p $bkup_dir

# to avoid first-run error on num_files=ls
numbkups=`find $bkup_dir -type f | wc -l`

if [ $numbkups != "0" ]; then

    num_files=`ls $bkup_dir*.tar.gz |wc -l`

    while [ $num_files -gt $savenum ]
        do
        deleteme=` ls -t $bkup_dir*.tar.gz |tail -n1`
        # echo "deleteme = $deleteme"
        rm $deleteme
        # reevaluate the value of $num_files remaining
        num_files=`ls $bkup_dir*.tar.gz |wc -l`
    done

    num_files=`ls $bkup_dir |grep chkconfig |wc -l`

    while [ $num_files -gt $savenum ]
        do
        deleteme=` ls -t ${bkup_dir}chkconfig_* |tail -n1`
        # echo "deleteme = $deleteme"
        rm $deleteme
        # reevaluate the value of $num_files remaining
        num_files=`ls $bkup_dir |grep chkconfig |wc -l`
    done

fi

extension='.tar'
bkup_file="rpm$datestring$extension"
cd /var/lib
tar -cf $bkup_file rpm
mv $bkup_file $bkup_dir
gzip $bkup_dir$bkup_file

chkfile="chkconfig_$datestring"
# RedHat older than 5 can't handle these so use older style above
# chkfile="chkconfig_"
# chkfile+=$datestring
/sbin/chkconfig --list > $bkup_dir$chkfile

exit