#!/bin/bash
#
# RMAN Log backup
# Written for Avon
# v1.1 - James Pattinson - October 2023
#
# usage: rman_logs.sh <ORACLE_SID>

MYDIR="$(dirname "$(readlink -f "$0")")"
export ORACLE_SID=$1

. $HOME/.profile

export ORAENV_ASK=NO
export ORACLE_SID=$1

. oraenv

export ORAENV_ASK=YES

source $MYDIR/rbk_api.conf
source $MYDIR/oracle_funcs.sh

#ORACLE_SID=$1

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

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

#ORAENV_ASK=NO
#. oraenv

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

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

get_log_mv
open_mv

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

if [[ $logMvPresent -eq 1 ]] && [[ $numChannels -eq 1 ]] ; then
	MOUNTPOINT=$MOUNTPOINT_PREFIX${ORACLE_SID}_log
else
	MOUNTPOINT=$MOUNTPOINT_PREFIX$ORACLE_SID
fi

# Disk space check
dusage=$(df -Ph | grep -E "$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

echo Running RMAN with log to $RMAN_LOG

if [[ $numChannels -eq 1 ]]; then
	allocate="allocate channel 'ch1' device type disk format '$MOUNTPOINT/%U';"
	release="release channel ch1;"
	channel0="$MOUNTPOINT"
else

	for i in $(seq 0 $(($numChannels - 1))); do 
	allocate+="allocate channel 'c$i' device type disk format '$MOUNTPOINT/log_c$i/%U';"
	release+="release channel c$i;"
	done
	channel0="$MOUNTPOINT/log_c0"

fi

# RMAN Part Here
###############################################################################
rman nocatalog log $RMAN_LOG append  > /dev/null <<EOF
connect target /
set echo on;
show all;
crosscheck backup;
run {
set controlfile autobackup format for device type disk to '$channel0/cf_%F';
$allocate
backup archivelog all not backed up 1 times tag 'RUBRIK_LOGS';
$release
}
allocate channel for maintenance device type disk;
delete noprompt backup of archivelog all completed before 'sysdate-3' tag RUBRIK_LOGS;
release channel;
EOF
###############################################################################

rmanStatus=$?

if [ $rmanStatus -ne 0 ]; then
    echo "WARNING: RMAN Log 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 Log 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 Log 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

if [[ $HOSTLOGRET -gt 0 ]]; then

	echo "Starting post-backup RMAN log purge"

	# Remove archivelogs from host after backup
	###############################################################################
	rman nocatalog log $RMAN_LOG append  > /dev/null <<EOF
	connect target /
	set echo on;
	run {
	delete noprompt archivelog until time 'sysdate-$HOSTLOGRET/24' backed up 1 times to device type disk;
	}
EOF
	###############################################################################

	rmanStatus=$?

	if [ $rmanStatus -ne 0 ]; then
		echo "WARNING: RMAN purge exited with Non-zero status $rmanStatus. Emailing log"
		cat $RMAN_LOG  | mailx -s "RMAN purge on ${HOST} for  ${ORACLE_SID} " $ALERT_EMAILS
	fi

fi