Merge pull request #1 from Riddhimaan-Senapati/Riddhimaan-Senapati-fixed_issue_#1555

fixed issue google#1555

Author: Riddhimaan-Senapati

cmd/osv-scanner/internal/helper/helper.go

@@ -22,6 +22,11 @@ var OfflineFlags = map[string]string{
 	// "experimental-licenses": "", // StringSliceFlag has to be manually cleared.
 }
 
+// sets default port(8000) as a global variable
+var (
+    servePort = "8000"  // default port
+)
+
 var GlobalScanFlags = []cli.Flag{
 	&cli.StringFlag{
 		Name:      "config",
@@ -45,6 +50,14 @@ var GlobalScanFlags = []cli.Flag{
 		Name:  "serve",
 		Usage: "output as HTML result and serve it locally",
 	},
+	&cli.StringFlag{
+		Name:  "port",
+		Usage: "port number to use when serving HTML report (default: 8000)",
+		Action: func(_ *cli.Context, p string) error {
+            servePort = p
+            return nil
+        },
+	},
 	&cli.StringFlag{
 		Name:      "output",
 		Usage:     "saves the result to the given file path",
@@ -129,7 +142,6 @@ func OpenHTML(r reporter.Reporter, outputPath string) {
 // The program will keep running to serve the HTML report on localhost
 // until the user manually terminates it (e.g. using Ctrl+C).
 func ServeHTML(r reporter.Reporter, outputPath string) {
-	servePort := "8000"
 	localhostURL := fmt.Sprintf("http://localhost:%s/", servePort)
 	r.Infof("Serving HTML report at %s.\nIf you are accessing remotely, use the following SSH command:\n`ssh -L local_port:destination_server_ip:%s ssh_server_hostname`\n", localhostURL, servePort)
 	server := &http.Server{