working towards lightwalletd deb package

cmd/server/main.go

@@ -3,6 +3,7 @@ package main
 import (
 	"context"
 	"flag"
+	"fmt"
 	"net"
 	"os"
 	"os/signal"
@@ -97,6 +98,14 @@ func main() {
 	flag.StringVar(&opts.hush3ConfPath, "conf-file", "", "conf file to pull RPC creds from")
 	flag.IntVar(&opts.cacheSize, "cache-size", 40000, "number of blocks to hold in the cache")
 
+	// creating --version so help2man will work
+	if len(os.Args) > 1 && (os.Args[1] == "--version" || os.Args[1] == "-v") {
+		// TODO find a better method than hardcode the version number here
+		fmt.Printf("hush lightwalletd version 0.1.1\n")
+		os.Exit(0)
+	}
+	// TODO determine why help2man is now complaining about --help even after I tried creating one...
+
 	// TODO prod metrics
 	// TODO support config from file and env vars
 	flag.Parse()

cmd/server/main_test.go

@@ -0,0 +1,32 @@
+// Copyright 2021 The Hush developers
+// Released under the GPLv3
+package main
+
+import (
+	"os"
+	"testing"
+)
+
+// TestFileExists checks whether or not the file exists
+func TestFileExists(t *testing.T) {
+	if fileExists("nonexistent-file") {
+		t.Fatal("fileExists unexpected success")
+	}
+	// If the path exists but is a directory, should return false
+	if fileExists(".") {
+		t.Fatal("fileExists unexpected success")
+	}
+	// The following file should exist, it's what's being tested
+	if !fileExists("main.go") {
+		t.Fatal("fileExists failed")
+	}
+}
+
+// fileExists checks if file exists and is not directory to prevent further errors
+func fileExists(filename string) bool {
+	info, err := os.Stat(filename)
+	if os.IsNotExist(err) {
+		return false
+	}
+	return !info.IsDir()
+}