Add `stack` and `volume` as shortcuts to docker

abra

@@ -192,6 +192,8 @@ sub_secret_insert() {
 	PW=$3
 
 	if [ -z "$SECRET" ] || [ -z "$VERSION" ] || [ -z "$PW" ]; then
+		error "Required arguments missing"
+		echo
 		echo "Usage: $PROGRAM_NAME secret insert SECRET VERSION PW"
 		exit
 	fi
@@ -205,6 +207,13 @@ sub_secret_generate(){
 	VERSION=$2
 	PWGEN=${3:-pwqgen}
 
+	if [ -z "$SECRET" ] || [ -z "$VERSION" ]; then
+		error "Required arguments missing"
+		echo
+		echo "Usage: $PROGRAM_NAME secret generate SECRET VERSION [PW]"
+		exit
+	fi
+
 	PW=$($PWGEN)
 
 	success "Password: $PW"
@@ -431,6 +440,18 @@ sub_upgrade() {
 	curl -fsSL https://install.abra.autonomic.zone | bash
 }
 
+###### Docker alias subcommands
+
+sub_stack() {
+	# shellcheck disable=SC2068
+	docker stack $@
+}
+
+sub_volume() {
+	# shellcheck disable=SC2068
+	docker volume $@
+}
+
 ###### Main
 
 SUBCOMMAND=$1