converge now uses flags for the command-line parsing.

Dockerfile

@@ -21,4 +21,4 @@ COPY --from=builder /opt/converge/bin/agent \
                     /opt/converge/docs/
 COPY --from=builder /opt/converge/static/ /opt/converge/docs/
 
-ENTRYPOINT ["/opt/converge/bin/converge", "/opt/converge/docs" ]
+ENTRYPOINT ["/opt/converge/bin/converge", "-docsdir", "/opt/converge/docs" ]

cmd/converge/server.go

@@ -3,6 +3,7 @@ package main
 import (
 	"converge/pkg/converge"
 	"converge/pkg/websocketutil"
+	"flag"
 	"fmt"
 	"log"
 	"net"
@@ -26,11 +27,30 @@ func catchAllHandler(w http.ResponseWriter, r *http.Request) {
 }
 
 func main() {
+	downloadOption := flag.String("docsdir", "downloads",
+		"directory where documentation is located, either relative to current directory or an absolute path")
 
-	downloadDir := "downloads"
-	if len(os.Args) == 2 {
-		downloadDir = os.Args[1]
+	flag.Usage = func() {
+		fmt.Fprintln(os.Stderr, "Usage: converge [options]")
+		fmt.Fprintln(os.Stderr)
+		fmt.Fprintln(os.Stderr, "Converge server is a rendez-vous server for debugging continuous integration")
+		fmt.Fprintln(os.Stderr, "jobs be providing the capability to log into the agents where jobs are running.")
+		fmt.Fprintln(os.Stderr, "This is achieve by starting an agent in the continuous integration job")
+		fmt.Fprintln(os.Stderr, "which connects to Converge using a websocket connection. The end user also connects")
+		fmt.Fprintln(os.Stderr, "to Converge using ssh over websockets. The server then matches the end-user with")
+		fmt.Fprintln(os.Stderr, "the agent running in the continous integration job (the rendez-vous) and sets up")
+		fmt.Fprintln(os.Stderr, "an end-to-end SSH connection between end-user and agent, with the agent providing")
+		fmt.Fprintln(os.Stderr, "an embedded SSH server to provide interactive access to the end-user. This works")
+		fmt.Fprintln(os.Stderr, "both on linux and on windows.")
+		fmt.Fprintln(os.Stderr)
+		flag.PrintDefaults()
 	}
+	flag.Parse()
+	if flag.NArg() != 0 {
+		flag.Usage()
+		os.Exit(1)
+	}
+	downloadDir := *downloadOption
 	log.Println("Doanload directory", downloadDir)
 
 	admin := converge.NewAdmin()