output mail digest system

digest.sh

# digest.sh
# Create an e-mail digest of all output, STDOUT and STDERR, and send it
# when given the proper command.
# Usage:
#       digest.sh add <job_name> <command>
#       # Send an e-mail and reset the digest
#       digest.sh send <job_name>
# Environment:
#       DIGEST_DIR:     The directory to store digests in
#       MAILTO:         The e-mail to send digests to

DIGEST_DIR=${DIGEST_DIR:-$HOME/var/spool/digest}
if [ ! -d "$DIGEST_DIR" ]; then
    echo "DIGEST_DIR $DIGEST_DIR does not exist!"
    exit 2
fi

add(){
    JOB_NAME=$1
    shift
    COMMAND=$*
    exec $COMMAND > $DIGEST_DIR/$JOB_NAME.$$ 2>&1
}

send(){
    if [[ "$MAILTO" == "" ]]; then
        echo "MAILTO must contain an e-mail address!"
        exit 1
    fi
    JOB_NAME=$1
    TEMPMAIL=/tmp/digest.$$.mail
    ALL_FILES=""
    for F in $DIGEST_DIR/$JOB_NAME.*; do
        ALL_FILES="$ALL_FILES $F"
    done
    if [[ "$ALL_FILES" == "" ]]; then
        exit 0; # Nothing to do
    fi

    cat - $ALL_FILES > $TEMPMAIL <<ENDMAIL
To: $MAILTO
From: $USER@$HOSTNAME
Subject: Cron <$USER@$HOSTNAME> Digest output for $JOB_NAME

ENDMAIL
    # Empty line before ENDMAIL is important to separate smtp mail header from body
    sendmail $MAILTO < $TEMPMAIL
    rm $TEMPMAIL

    rm $ALL_FILES
}

COMMAND=$1
shift
JOB_NAME=$1
shift
if [[ "$COMMAND" == "add" ]]; then
    add $JOB_NAME $*
elif [[ "$COMMAND" == "send" ]]; then
    send $JOB_NAME $*
else
    echo "Must specify either 'add' or 'send' as first argument!"
    exit 1
fi