#!/usr/bin/ksh
#
# RMAN DB backup with incremental Merge
# Written for HCL / Nokia
# v1.0 - James Pattinson - November 2025
#
# usage: rman_db.ksh <ORACLE_SID>

_SCRIPT_="$0"
 
get_script_dir() {
  script="$1"
  case "$script" in
    /*) abs_path="$script" ;;
    *) abs_path="$PWD/$script" ;;
  esac
  while [ -L "$abs_path" ]; do
    link=$(readlink "$abs_path")
    case "$link" in
      /*) abs_path="$link" ;;
      *) abs_path="$(dirname "$abs_path")/$link" ;;
    esac
  done
  script_dir=$(dirname "$abs_path")
  cd "$script_dir" 2>/dev/null && pwd
}

MYDIR=$(get_script_dir "$_SCRIPT_")

. $MYDIR/rubrik.conf
. $MYDIR/oracle_funcs.ksh

set_oracle_env $1

export NLS_DATE_FORMAT='mm-dd-yyyy hh24:mi:ss'
export NLS_LANG=AMERICAN_AMERICA.AL32UTF8

usage() {
	echo "Usage: $0 <DBNAME>]" 1>&2
	exit 1
}

if [ -z "${ORACLE_SID}" ]; then
    usage
fi

MOUNTPOINT=$MOUNTPOINT_PREFIX/$ORACLE_SID/data

mkdir -p $RMAN_LOG_DIR/$ORACLE_SID/
RMAN_LOG=$RMAN_LOG_DIR/$ORACLE_SID/rman_${ORACLE_SID}_DB_$(date +%d%m%y).log

# Disk space check
dusage=$(df -Pk | grep -E "$MOUNTPOINT" | sed s/%//g | awk -v spaceWarn=$MV_SPACE_WARN '{ if($5 >= spaceWarn) print $0;}')
if [ "$dusage" != "" ]; then
	echo "WARNING: Disk Space Alert - sending email"
	echo "$dusage" | mailx -s "WARNING: Rubrik MV Disk Space Alert On $(hostname) at $(date)" $ALERT_EMAILS
else
	echo "INFO: Rubrik MV Disk usage is under threshold of ${MV_SPACE_WARN}%"
fi

get_data_mv
open_mv

echo "DEBUG: numChannels=$numChannels, MOUNTPOINT=$MOUNTPOINT"

if [ $? -ne 0 ]; then
    echo ERROR: Unable to open MV, aborting
    exit_with_error
fi


echo Running RMAN with log to $RMAN_LOG

# Default RMAN channels per mount if not set
RMAN_CHANNELS_PER_MOUNT=${RMAN_CHANNELS_PER_MOUNT:-1}

total_channels=$(expr $numChannels \* $RMAN_CHANNELS_PER_MOUNT)

if [ $total_channels -eq 1 ]; then
	allocate="allocate channel 'ch1' device type disk format '$MOUNTPOINT/%U';"
	release="release channel ch1;"
	channel0="$MOUNTPOINT"
else
	allocate=""
	release=""
	i=0
	while [ $i -lt $numChannels ]; do
		j=0
		while [ $j -lt $RMAN_CHANNELS_PER_MOUNT ]; do
			suffix=$(echo $j | tr '0123456789' 'abcdefghijklmnopqrstuvwxyz')
			allocate="$allocate allocate channel 'c${i}${suffix}' device type disk format '$MOUNTPOINT/c$i/%U';"
			release="$release release channel c${i}${suffix};"
			j=$(expr $j + 1)
		done
		i=$(expr $i + 1)
	done
	channel0="$MOUNTPOINT/c0"
fi


# Save the current time (minus one hour) to ensure we catch all archive logs
startTime=$(perl -e 'use POSIX qw(strftime); $time = time() - 3600; print strftime("%m-%d-%Y %H:%M:%S", localtime($time))')
	
# RMAN Part Here
###############################################################################
#cat > /tmp/rman.cmd <<EOF

# Now perform the backup and merge
rman nocatalog log $RMAN_LOG append > /dev/null <<EOF
#cat <<EOF
connect target /
set echo on;
configure retention policy to recovery window of 1 days;
run {
CONFIGURE BACKUP OPTIMIZATION OFF;
set controlfile autobackup format for device type disk to '$channel0/cf_%F';
$allocate
backup incremental level 1 for recover of copy with tag 'rubrik_snap' database;
recover copy of database with tag 'rubrik_snap';
backup as copy current controlfile;
backup archivelog from time '$startTime' tag 'rubrik_snap_logs';  
$release
}
allocate channel for maintenance device type disk;
crosscheck backup;
crosscheck copy;
delete noprompt obsolete device type disk;
delete noprompt backup of archivelog all completed before 'sysdate-2' tag rubrik_snap_logs;
release channel;
EOF
###############################################################################

rmanStatus=$?

if [ $rmanStatus -ne 0 ]; then
    echo "WARNING: RMAN DB backup exited with Non-zero status $rmanStatus. Emailing log"
	cat $RMAN_LOG  | mailx -s "RMAN Log backup Failed on ${HOST} for ${ORACLE_SID}" $ALERT_EMAILS
elif [ $EMAIL_SUCCESS -eq 1 ]; then
	echo "SUCCESS: RMAN DB backup exited with zero status"
	echo "RMAN job finished with Zero status. Note that this does not guarantee the contents of the backup."  | mailx -s "SUCCESS: RMAN DB backup exited with zero status on ${HOST} for ${ORACLE_SID}" $ALERT_EMAILS
fi

# Change permission of backup files to enable alternate host restore
find $MOUNTPOINT -type f -exec chmod 644 {} \; 2>/dev/null

close_mv