Update Dockerfile and magellan.sh for container

Dockerfile

@@ -1,13 +1,15 @@
 FROM cgr.dev/chainguard/wolfi-base
 
-RUN apk add --no-cache tini
+RUN apk add --no-cache tini bash
 
 # nobody 65534:65534
 USER 65534:65534
 
 
-COPY  magellan  /
+COPY  magellan  /magellan
+COPY  bin/magellan.sh /usr/bin/magellan.sh
 
-CMD [ "/magellan" ]
+
+CMD [ "/magellan.sh" ]
 
 ENTRYPOINT [ "/sbin/tini", "--" ]

bin/magellan.sh

@@ -1,17 +1,78 @@
+#!/bin/bash
+
+EXE=./magellan
+SUBNETS=""
+PORTS=""
+USER=""
+PASS=""
+ARGS=""
+
 
 function build(){
-    go mod tidy && go build -C bin/magellan
+	go mod tidy && go build -C bin/magellan
 }
 
 function scan() {
-    ./magellan scan --subnet 172.16.0.0 --port 443
+	# ./magellan scan --subnet 172.16.0.0 --port 443
+	${EXE} scan --subnet ${SUBNETS} --port ${PORTS}
 }
 
 function list(){
-    ./magellan list
+	# ./magellan list
+	${EXE} list 
 }
 
 function collect() {
-    ./magellan collect --user admin --pass password
+	# ./magellan collect --user admin --pass password
+	${EXE} collect --user ${USER} --pass ${PASS}
 }
 
+
+# parse incoming arguments to set variables
+while [[ $# -gt 0 ]]; do
+  case $1 in
+	--subnet)
+		SUBNETS="$2"
+		shift # past argument
+		shift # past value
+		;;
+	-p|--port)
+		PORTS="$2"
+		shift # past argument
+		shift # past value
+		;;
+	--user)
+		USER="$2"
+		shift # past argument
+		shift # past value
+		;;
+	--pass|--password)
+		PASS="$2"
+		shift
+		shift
+		;;
+	-*|--*)
+		echo "Unknown option $1"
+		exit 1
+		;;
+	*)
+		ARGS+=("$1") # save positional arg
+		shift # past argument
+		;;
+  esac
+done
+
+set -- "${POSITIONAL_ARGS[@]}" # restore positional parameters
+
+echo "subnets 	= ${SUBNETS}"
+echo "ports	 	= ${PORTS}"
+echo "user 		= ${USER}"
+echo "pass 		= ..."
+
+if [[ -n $1 ]]; then
+	echo "Last line of file specified as non-opt/last argument:"
+	tail -1 "$1"
+fi
+
+scan
+collect