Add parameters and usage function to backup script.

bin/backup.sh

@@ -16,6 +16,39 @@ BASENAME="Backup"
 file="$BACKUP_DIR/$BASENAME.$DATE.$HOSTNAME.$TAG.zip"
 time="`which time`"
 
+## Functions ##
+
+function usage {
+	cat <<- EOF
+		Backup script for Hyperling's self-managed Docker setup.
+
+		Usage: $PROG [-u] [-d] [-h]
+			-u : Bring all containers up after the backup has finished.
+			-d : Bring all containers down before taking the backup.
+			-h : Display this help text.
+
+		Example:
+			$PROG -ud
+	EOF
+
+	exit $1
+}
+
+## Parameters ##
+
+up=FALSE
+down=FALSE
+
+while getopts ':udh' opt; do
+	case "$opt" in
+		u) up=TRUE ;;
+		d) down=TRUE ;;
+		h) usage 0 ;;
+		*) echo "ERROR: Option $OPTARG not recognized." >&2
+			usage 1 ;;
+	esac
+done
+
 ## Main ##
 
 # Ensure backup directory exists with correct permissions.
@@ -30,8 +63,10 @@ cd "$BACKUP_DIR"
 mv -v "$BASENAME"*"$TAG"* TRASH/
 rm -v TRASH/*
 
-echo -e "\n`date` - Take down services for a cold backup."
-manage.sh -d
+if [[ "$down" == "TRUE" ]]; then
+	echo -e "\n`date` - Take down services for a cold backup."
+	manage.sh -d
+fi
 
 echo -e "\n`date` - Create the backup for '$DOCKER_HOME'."
 $time zip -r $file.tmp \
@@ -46,8 +81,10 @@ ls -sh $file
 echo -e "\n`date` - Ensure other users can access the file."
 chmod -v 755 $file
 
-echo -e "\n`date` - Bring services back up."
-manage.sh -u
+if [[ "$up" == "TRUE" ]]; then
+	echo -e "\n`date` - Bring services back up."
+	manage.sh -u
+fi
 
 ## Finish ##