#! /bin/bash

    HOST=`hostname -s`
    CONFIG=`dirname ${0}`"/submit.cf"
    BCC=""
    SUBJECT="Daily Backup on ${HOST}"
    NAME="server "`uname -n`

    M_BODY=""
    D_NOW=`/bin/date +%c`

    W_DAY=`/bin/date +%A`

    if [[ "$W_DAY" = "Monday" ]]
    then
        Y_DAY=`date  +%Y-%b-%d -d "Today - 2 days"`
    else
        Y_DAY=`date +%A -d "Today - 1 day"`
    fi

    err_msg ()
    {
    EMSG=" ERROR Detected while running backup for ${D_SET}"
    M_BODY="${M_BODY}"$'\n'$'\n'" -- "$'\n'$'\n'"${EMSG}"$'\n'$'\n'"      ${1} --"
    SUBJECT="ERROR: Daily Backup on ${HOST}"
    }

    snd_email ()
    {
    BODY=$1

    echo -e "To: ${TO}
    Cc: ${CC}
    Bcc: ${BCC}
    Subject: ${SUBJECT}
    User-Agent: Heirloom mailx 12.4 7/29/08
    MIME-Version: 1.0
    Content-Type: text/plain; charset=us-ascii
    Content-Transfer-Encoding: 7bit


    Daily Backup on ${HOST} completed with the following messages

    ${BODY}

    -- Linux automated notification script

    "|/usr/sbin/sendmail -vt -f${FROM} -C${CONFIG}

    }

    EMSG=""
    M_BODY=""
    for D_SET in $*
    do

        if [[ -z "${D_SET}" ]]
        then
            err_msg "Filesystem argument is NULL"
            continue
        fi
        ZFS_1=`/sbin/zfs get -H type ${D_SET}|cut -d $'\t' -f 1`
        if [[ ${ZFS_1} != ${D_SET} ]]
        then
            err_msg "Argument is NOT a ZFS filesystem name"
            continue
        fi
        if [[ -n `/sbin/zfs list -H -t snapshot ${D_SET}@${W_DAY}` ]]
        then
            /sbin/zfs destroy -r ${D_SET}@${W_DAY}
            if [[ "${?}" -ne "0" ]]
            then
                err_msg "Failure destroying existing snapshots for ${D_SET}@${W_DAY}"
                continue
            fi
        fi
        /sbin/zfs snapshot -r ${D_SET}@${W_DAY}
        if [[ "${?}" -ne "0" ]]
        then
            err_msg "Failure creating zfs snapshots for ${D_SET}@${W_DAY}"
            continue
        fi
        ssh gemini "/sbin/zfs destroy -r ${D_SET}@${W_DAY}"
        if [[ "${?}" -ne "0" ]]
        then
            err_msg "Failure Destroying snapshots on gemini for ${D_SET}@${W_DAY}"
        fi
        /sbin/zfs send -R -i ${D_SET}@${Y_DAY} ${D_SET}@${W_DAY}| nc -w 200 gemini 8023
        if [[ "${?}" -ne "0" ]]
        then
            err_msg "Failure sending zfs incremental snapshots to gemini for ${D_SET}@${W_DAY}"
            continue
        fi
        LOC_N=`/sbin/zfs list -r -t snapshot ${D_SET}| grep @${W_DAY}|wc -l`
        LOC_R=`ssh gemini "/sbin/zfs list -r -t snapshot ${D_SET}| grep @${W_DAY}|wc -l"`
        if [[ "${LOC_N}" -ne "${LOC_R}" ]]
        then
            err_msg "Error, snapshot count inconsistency between atlas & gemini for ${D_SET}@${W_DAY}; atlas=${LOC_N} , gemini=${LOC_R}"
            continue
        fi

        if [[ "${EMSG}K" = "K" ]]
        then
            M_BODY="${M_BODY}"$'\n'$'\n'" No problems were detected for backup of ${D_SET}.(atlas=${LOC_N} , gemini=${LOC_R}) "$'\n'" The backed up data as of ${D_NOW} is found in"$'\n'"    .zfs/snapshot/${W_DAY}"
            ssh gemini 'echo "pass" > /var/lib/zfs-scripts/daily.status'
        else
            M_BODY="${M_BODY}"$'\n'$'\n'" ATTENTION: Errors were detected for backup of ${D_SET}.(atlas=${LOC_N} , gemini=${LOC_R}) "$'\n'" The backed up data as of ${D_NOW} is found in"$'\n'"    .zfs/snapshot/${W_DAY}"
            ssh gemini 'echo "fail" > /var/lib/zfs-scripts/daily.status'
        fi

    done

    snd_email "$M_BODY"