Random port after all #152

Former-commit-id: cac7b9214af0d8f01c98aa8dd8a9cd3d564125cb [formerly 25bf09a073b247ca282796610a4ac3de6f98e6ec] [formerly ba24813e1e5e4fc9105ff6a48018e6d6d6ed3142 [formerly dd3ccec696]]
Former-commit-id: 79b54956082db4f93d78cb04c48bcab4390c1163 [formerly 6cf6c0f610527cf7664149bd8fcccc22107f8de8]
Former-commit-id: 092e7842602412ef71623865bc32856ba959bbbc

README.md

@@ -58,6 +58,8 @@ The `scope`, `allowCommands`, `allowEdit`, `allowNew` and `commands` options are
 Otherwise, you may not want to use a configuration file, which can be done using the following flags:
 
 ```
+-address string
+      Address to listen to (default is all of them)
 -allow-commands
       Default allow commands option (default true)
 -allow-edit
@@ -69,9 +71,9 @@ Otherwise, you may not want to use a configuration file, which can be done using
 -database string
       Database path (default "./filemanager.db")
 -port string
-      HTTP Port (default "80")
+      HTTP Port (default is random)
 -scope string
-      Defualt scope for new users (default ".")
+      Default scope for new users (default ".")
 ```
 
 # Features

cmd/filemanager/main.go

@@ -5,6 +5,7 @@ import (
 	"flag"
 	"fmt"
 	"io/ioutil"
+	"net"
 	"net/http"
 	"strconv"
 	"strings"
@@ -27,6 +28,7 @@ type confFile struct {
 }
 
 var (
+	addr          string
 	config        string
 	database      string
 	scope         string
@@ -39,7 +41,8 @@ var (
 
 func init() {
 	flag.StringVar(&config, "config", "", "JSON configuration file")
-	flag.StringVar(&port, "port", "8080", "HTTP Port")
+	flag.StringVar(&port, "port", "0", "HTTP Port (default is random)")
+	flag.StringVar(&addr, "address", "", "Address to listen to (default is all of them)")
 	flag.StringVar(&database, "database", "./filemanager.db", "Database path")
 	flag.StringVar(&scope, "scope", ".", "Default scope for new users")
 	flag.StringVar(&commands, "commands", "git svn hg", "Space separated commands available for new users")
@@ -72,8 +75,13 @@ func main() {
 	fm.SetBaseURL("/")
 	fm.SetPrefixURL("/")
 
-	fmt.Println("Starting filemanager on *:" + port)
+	listener, err := net.Listen("tcp", addr+":"+port)
-	if err := http.ListenAndServe(":"+port, fm); err != nil {
+	if err != nil {
+		panic(err)
+	}
+
+	fmt.Println("Listening on", listener.Addr().String())
+	if err := http.Serve(listener, fm); err != nil {
 		panic(err)
 	}
 }