Backup using rsync+ssh

gbackup

#!/usr/bin/env bash

#Title           : gbackup
#Description     : Backup script using rsync+ssh
#Author          : E.K. KIM (euikook@gmail.com)
#Date            : 2018-02-19
#Version         : 1.0
#Usage           : gbackup [-i] [-d DAYS] [-h REMOTE-HOST]  [-e SSH-OPTS] <SRC-DIR> <DST-DIR>
#Notes           : None

# m h  dom mon dow   command
# 00 04 * * * ~/bin/gbackup -h s01 -e ssh /home /home/backup/s01/home
# 00 05 * * * ~/bin/gbackup -h s02 -e ssh /home /home/backup/s02/home
# 00 06 * * * ~/bin/gbackup -h s03 -e ssh /home /home/backup/s03/home

# VARIABLES
DURATIONS=0	# Number of days which keep old backup.
EXCLUDES=".gbackup.excludes"

# EXECUTABLES
SSH=/usr/bin/ssh
SCP=/usr/bin/scp
FIND=/usr/bin/find
DATE=/bin/date
MKDIR=/bin/mkdir
TOUCH=/bin/touch
SLINK="ln -s"

ECHO=/bin/echo
ECHOERR=">&2 $ECHO"

DELETE=/bin/rm
DELETEF="/bin/rm -f"
DELETERF="rm -rf"

RSYNC=/usr/bin/rsync
REMOTERSYNC="/usr/bin/sudo /usr/bin/rsync"

TODAY=`$DATE "+%Y-%m-%d"`
INCBKUP=0

while [ $# -gt 0 ]; do
    case "$1" in 
        -h | --host) RM_HOST=$2; shift;;
        -e | --ssh ) RM_OPTS=$2; shift;;
        -i | --incremental ) INCBKUP=1; ;;
        -d | --delete-old-backup ) DURATIONS=$2; shift;;
        -*) $ECHOERR >&2 "usage $0 [-h HOST] [-i] [-e SSH_OPTION] <SRC DIR> <DST DIR>"
            exit 1;;
        *) break;; # terminate while loop 
    esac
    shift;
done

SRC_DIR=$1
DST_DIR=$2

[[ $DURATIONS =~ ^-?[0-9]+$ ]] || {
    $ECHOERR "'$DURATIONS' is not integer"
    exit 0
}

if [ $RM_HOST = "" ]; then
    SSH_OPTS=""
	BKUP_SRC=$SRC_DIR
else
    SSH_OPTS="-e \"$RM_OPTS\""
    BKUP_SRC="$($ECHO "$RM_HOST:$SRC_DIR/" | sed 's/ /\\ /g')"
fi

BKUP_DST=$DST_DIR


[ -d "$BKUP_DST" ] || {
	$ECHOERR "No such file or directory: '$BKUP_DST'"
	exit 1;
}

cd "$BKUP_DST"

RSYNC_OPTS="-apvz          \
            $SSH_OPTS      \
            --numeric-ids"

if [ "$INCBKUP" -eq "1" ]; then
    LASTEST=$BKUP_DST/lastest
    UUID=`uuid -v 4`

    CURRENT="$BKUP_DST/$TODAY/$UUID"

    if [ -L "$LASTEST" ]; then
        LINKDEST="--link-dest=\"$LASTEST\""
    fi

    RSYNC_OPTS+=" $LINKDEST"

    LOG_DIR="$BKUP_DST/$TODAY"
    BKUP_LOG=$LOG_DIR/$UUID.log

else
    CURRENT="$BKUP_DST"
    RSYNC_OPTS+=" --delete          \
                  --delete-excluded"

    BKUP_NAME=`basename "$BKUP_DST"`

    LOG_DIR="$BKUP_DST/../Log"
    BKUP_LOG="$LOG_DIR/$BKUP_NAME-$NOW.log"
fi

RSYNC_EXCL_OPTS="--delete --include=\"$EXCLUDES\" --exclude=\"*\""

RSYNC_EXCL="$RSYNC $RSYNC_OPTS     \
                   $SYNC_EXCL_OPTS \
                   \"$BKUP_SRC\"   \
                   \"$BKUP_DST\""

# Sync excludes file first.
eval $RSYNC_EXCL 2>&1 > /dev/null

[ -f "$DST_DIR/$EXCLUDES" ] && {
    RSYNC_OPTS+=" --exclude-from \"$DST_DIR/$EXCLUDES\""
}

[ -d "$LOG_DIR" ] || {
    $MKDIR -p "$LOG_DIR"
}

$DATE > "$BKUP_LOG"

RSYNC_BKUP="$RSYNC $RSYNC_OPTS \
                   \"$BKUP_SRC\"   \
                   \"$CURRENT\""

$ECHO $RSYNC_BKUP >> "$BKUP_LOG"
eval $RSYNC_BKUP 2>&1 >> "$BKUP_LOG" || {
    $ECHOERR "Can't backup from \"$BKUP_SRC\"."
    $ECHOERR "Please see more details \"$BKUP_LOG\"."
    exit -1
}

$TOUCH "$CURRENT"

if [ "$INCBKUP" -eq "1" ]; then
    $DELETEF "$LASTEST"
    $SLINK `realpath --relative-to="$BKUP_DST" "$CURRENT"` "$LASTEST"
    $TOUCH "$LASTEST"

    # REMOVE OLD BACKUPS
    [ "$DURATIONS" -gt "0" ] && {
        LIST=$( $FIND "$DST_DIR" -maxdepth 1 -type d -mtime +$DURATIONS )
        for FILE in $LIST; do
            $ECHO "DELETE OLD THAN $DURATIONS days: $FILE"
            # UNCOMMENT BELOW LINE CAREFULLY!!
            $DELETERF "$FILE"
        done
    }
fi
exit 0