Block ports in range 0 to 10000 when running tests (#666)

.travis.yml

@@ -39,6 +39,7 @@ matrix:
         - popd
         - go install -race ./...
       script:
+        - go run scripts/use-ports.go -from 1024 -to 10000 &
         - go test -race -cover -coverprofile=.coverprofile -json ./... | tparse -all
         - goveralls -coverprofile=.coverprofile -service=travis-ci
         - rm .coverprofile

scripts/use-ports.go

@@ -0,0 +1,49 @@
+// Copyright (C) 2018 Storj Labs, Inc.
+// See LICENSE for copying information.
+
+// +build ignore
+
+package main
+
+import (
+	"flag"
+	"fmt"
+	"net"
+	"os"
+	"os/signal"
+	"strconv"
+	"syscall"
+)
+
+var (
+	fromPort = flag.Int("from", 0, "first port")
+	toPort   = flag.Int("to", 10000, "last port")
+)
+
+func main() {
+	flag.Parse()
+
+	var listeners []net.Listener
+	var unableToStart []int
+	for port := *fromPort; port < *toPort; port++ {
+		listener, err := net.Listen("tcp", net.JoinHostPort("127.0.0.1", strconv.Itoa(port)))
+		if err != nil {
+			unableToStart = append(unableToStart, port)
+			continue
+		}
+		listeners = append(listeners, listener)
+	}
+	fmt.Printf("use-ports: unable to start on %v\n", unableToStart)
+	fmt.Printf("use-ports: listening on ports %v to %v\n", *fromPort, *toPort)
+
+	sigs := make(chan os.Signal, 1)
+	signal.Notify(sigs, syscall.SIGQUIT)
+	<-sigs
+
+	for _, listener := range listeners {
+		err := listener.Close()
+		if err != nil {
+			fmt.Printf("unable to close: %v\n", err)
+		}
+	}
+}