super-cool error handling

remote-backup

@@ -72,11 +72,35 @@ do
 	esac
 done
 
+declare -a failedBackups
+declare -A failedWith
+
+failRsync() {
+	nameFailed="$1"
+	code=$2
+	path="$3"
+	failedBackups+=( "$name" )
+	if [ -d "$3" ]
+	then
+		touch "$3/unfinished.remote-backup"
+		failedWith["$name"]="RSYNC_PARTIAL $code"
+	else
+		failedWith["$name"]="RSYNC_FAILED $code"
+	fi
+}
+
+openLog() {
+	exec 3>&1
+	exec 1>> /var/log/remote-backup
+	exec 2>&1
+}
+
 doBackup() {
 	config="$1"
 	if [ ! -e "$config" ]
 	then
 		echo "No backups defined, dying." >&2
+		echo "No backups defined, dying." >&3
 		exit 128
 	fi
 	source /etc/remote-backup/defaults.conf
@@ -91,6 +115,8 @@ doBackup() {
 		if (( $? ))
 		then
 			echo "snapshot: could not remount $SNAPSHOT_RW readwrite" >&2
+			failedBackups+=( "$NAME" )
+			failedReason["$NAME"]="REMOUNT_RW $MOUNT_DEVICE"
 			return 1
 		fi
 	fi
@@ -114,8 +140,7 @@ doBackup() {
 		$MOUNT -o remount,ro "$MOUNT_DEVICE" "$SNAPSHOT_RW"
 		if (( $? ))
 		then
-			echo "snapshot: could not remount $SNAPSHOT_RW readonly"
-			exit
+			echo "snapshot: could not remount $SNAPSHOT_RW readonly" >&2
 		fi
 	fi
 
@@ -188,28 +213,25 @@ runBackup() {
 		$ADDITIONAL_RSYNC_OPTS		\
 		"${REMOTE_LOCATION}"		\
 		"$SNAPSHOT_RW/$NAME/$1"
-	if	   (( $? == 2 ))
-	then
+
+	returncode=$?
+	case $returncode in
+		0)
+			:
+		;;
+		2)
 			if (( proto29 ))
 			then
-			echo "Still failing, giving up"
+				fail "$NAME" PROTO_MISMATCH
 			else
 				echo "Rsync protocol mismatch, trying with only one --link-dest"
 				runBackup "$1" PROTOCOLMISMATCH
 			fi
-	elif (( $? == 10 ))	\
-	||   (( $? == 12 ))	\
-	||   (( $? == 20 ))	\
-	||   (( $? == 21 ))	\
-	||   (( $? == 22 ))	\
-	||   (( $? == 23 ))	\
-	||   (( $? == 30 ))
-	then
-		if [ -d "$SNAPSHOT_RW/$NAME/$1" ]
-		then
-			touch "$SNAPSHOT_RW/$NAME/$1/unfinished.remote-backup"
-		fi
-	fi
+		;;
+		*)
+			failRsync "$NAME" $returncode "$SNAPSHOT_RW/$NAME/$1"
+		;;
+	esac
 
 # step 5: update the mtime of daily.0 to reflect the snapshot time
 	$TOUCH "$SNAPSHOT_RW/$NAME/$1"
@@ -225,6 +247,8 @@ then
 	exit
 fi
 
+openLog
+
 if [ -n "$EMERG" ]
 then
 	doBackup /etc/remote-backup/"${EMERG//\//_}"/config emerg
@@ -234,3 +258,34 @@ else
 		doBackup "$config"
 	done
 fi
+
+if (( ${#failedBackups} ))
+then
+	cat <<-EOF
+		Some backups exited non-zero.
+		See the logfile for more detail.
+
+	EOF
+	for backup in ${failedBackups[@]}
+	do
+		echo -n "$backup failed: "
+		read info more_info <<< "${failedWith["$backup"]}"
+		case $info in
+			RSYNC_PARTIAL)
+				echo "Partial transfer, will *NOT* get rotated - rsync returned $more_info."
+			;;
+			RSYNC_FAILED)
+				echo "No files transferred - rsync returned $more_info."
+			;;
+			PROTO_MISMATCH)
+				echo "No files transferred - Protocol mismatch - Upgrade rsync daemon"
+			;;
+			REMOUNT_RW)
+				echo "Target device $more_info could not be mounted ReadWrite."
+			;;
+			*)
+				echo "$info $moreinfo"
+			;;
+		esac
+	done
+fi