From 4e00543450cbfc6a25c64b929cc538945f57eacf Mon Sep 17 00:00:00 2001
From: Razvan Marescu <rmarescu@gmail.com>
Date: Tue, 7 Dec 2010 20:58:50 -0800
Subject: [PATCH] New feature - email alert using mailx

---
 README          | 16 ++++++++++------
 dt-s3-backup.sh | 24 ++++++++++++++++++++++++
 2 files changed, 34 insertions(+), 6 deletions(-)

diff --git a/README b/README
index 83ec4bb..3cb90bb 100644
--- a/README
+++ b/README
@@ -9,7 +9,10 @@ passphrases.
 
 Most importantly, you can easily backup the script and your gpg key in a
 convenient passphrase-encrypted file.  This comes in in handy if/when your
-machine ever does go belly up. 
+machine ever does go belly up.
+
+Optionally, you can set up an email address where the log file will be sent.
+Useful when the script is used via cron.
 
 More information about this script avaiable at:
 http://damontimm.com/code/dt-s3-backup
@@ -35,8 +38,9 @@ REQUIREMENTS
 
 * duplicity
 * gpg
-* Amazon S3 
+* Amazon S3
 * s3cmd (optional)
+* mailx (optional)
 
 COMMON USAGE EXAMPLES
 =====================
@@ -51,7 +55,7 @@ COMMON USAGE EXAMPLES
     $ dt-s3-backup.sh --full
 
 * Restore your entire backup:
-	$ dt-s3-backup.sh --restore 
+	$ dt-s3-backup.sh --restore
     You will be prompted for a restore directory
 
 	$ dt-s3-backup.sh --restore /home/user/restore-folder
@@ -80,7 +84,7 @@ NEXT VERSION WISH LIST
 ======================
 
 * --restore-dir option
-* restore files from a specific time period 
+* restore files from a specific time period
+* support multiple MTAs for the email alert feature
 
-
-Thanks to Mario Santagiuliana for his help. 
+Thanks to Mario Santagiuliana for his help.
diff --git a/dt-s3-backup.sh b/dt-s3-backup.sh
index 2afd982..e38efa8 100755
--- a/dt-s3-backup.sh
+++ b/dt-s3-backup.sh
@@ -100,6 +100,18 @@ LOG_FILE="duplicity-`date +%Y-%m-%d_%H-%M`.txt"
 LOG_FILE_OWNER="foobar_user_name:foobar_user_name"
 VERBOSITY="-v3"
 
+# EMAIL ALERT
+# Provide an email address to receive the logfile by email. If no email 
+# address is provided, no alert will be sent. 
+# You can set a custom from email address and a custom subject (both optionally)
+# If no value is provided for the subject, the following value will be 
+# used by default: "DT-S3 Alert ${LOG_FILE}"
+# MTA used: mailx
+#EMAIL="admin@example.com"
+EMAIL_TO=
+EMAIL_FROM=
+EMAIL_SUBJECT=
+
 # TROUBLESHOOTING: If you are having any problems running this script it is
 # helpful to see the command output that is being generated to determine if the
 # script is causing a problem or if it is an issue with duplicity (or your
@@ -114,6 +126,7 @@ VERBOSITY="-v3"
 LOGFILE="${LOGDIR}${LOG_FILE}"
 DUPLICITY="$(which duplicity)"
 S3CMD="$(which s3cmd)"
+MAIL="$(which mailx)"
 
 NO_S3CMD="WARNING: s3cmd is not installed, remote file \
 size information unavailable."
@@ -419,6 +432,17 @@ fi
 
 echo -e "--------    END DT-S3-BACKUP SCRIPT    --------\n" >> ${LOGFILE}
 
+if [ $EMAIL_TO ]; then
+	if [ ! -x "$MAIL" ]; then
+		echo -e "Email coulnd't be sent. mailx not available." >> ${LOGFILE}
+	else
+		EMAIL_FROM=${EMAIL_FROM:+"-r ${EMAIL_FROM}"}
+		EMAIL_SUBJECT=${EMAIL_SUBJECT:="DT-S3 Alert ${LOG_FILE}"}
+		${MAIL} -s """${EMAIL_SUBJECT}""" $EMAIL_FROM ${EMAIL_TO} < ${LOGFILE}
+		echo -e "Email alert sent to ${EMAIL_TO} using ${MAIL}" >> ${LOGFILE}
+	fi
+fi
+
 if [ ${ECHO} ]; then
   echo "TEST RUN ONLY: Check the logfile for command output."
 fi