Alternative fix for #2641: make random script name actually random

builder/virtualbox/iso/builder.go

@@ -4,9 +4,7 @@ import (
 	"errors"
 	"fmt"
 	"log"
-	"math/rand"
 	"strings"
-	"time"
 
 	"github.com/mitchellh/multistep"
 	vboxcommon "github.com/mitchellh/packer/builder/virtualbox/common"
@@ -211,9 +209,6 @@ func (b *Builder) Prepare(raws ...interface{}) ([]string, error) {
 }
 
 func (b *Builder) Run(ui packer.Ui, hook packer.Hook, cache packer.Cache) (packer.Artifact, error) {
-	// Seed the random number generator
-	rand.Seed(time.Now().UTC().UnixNano())
-
 	// Create the driver that we'll use to communicate with VirtualBox
 	driver, err := vboxcommon.NewDriver()
 	if err != nil {

builder/virtualbox/ovf/builder.go

@@ -4,8 +4,6 @@ import (
 	"errors"
 	"fmt"
 	"log"
-	"math/rand"
-	"time"
 
 	"github.com/mitchellh/multistep"
 	vboxcommon "github.com/mitchellh/packer/builder/virtualbox/common"
@@ -35,9 +33,6 @@ func (b *Builder) Prepare(raws ...interface{}) ([]string, error) {
 // Run executes a Packer build and returns a packer.Artifact representing
 // a VirtualBox appliance.
 func (b *Builder) Run(ui packer.Ui, hook packer.Hook, cache packer.Cache) (packer.Artifact, error) {
-	// Seed the random number generator
-	rand.Seed(time.Now().UTC().UnixNano())
-
 	// Create the driver that we'll use to communicate with VirtualBox
 	driver, err := vboxcommon.NewDriver()
 	if err != nil {

builder/vmware/iso/builder.go

@@ -5,7 +5,6 @@ import (
 	"fmt"
 	"io/ioutil"
 	"log"
-	"math/rand"
 	"os"
 	"strings"
 	"time"
@@ -246,9 +245,6 @@ func (b *Builder) Run(ui packer.Ui, hook packer.Hook, cache packer.Cache) (packe
 	state.Put("hook", hook)
 	state.Put("ui", ui)
 
-	// Seed the random number generator
-	rand.Seed(time.Now().UTC().UnixNano())
-
 	steps := []multistep.Step{
 		&vmwcommon.StepPrepareTools{
 			RemoteType:        b.config.RemoteType,

main.go

@@ -6,10 +6,12 @@ import (
 	"io"
 	"io/ioutil"
 	"log"
+	"math/rand"
 	"os"
 	"path/filepath"
 	"runtime"
 	"sync"
+	"time"
 
 	"github.com/mitchellh/cli"
 	"github.com/mitchellh/packer/command"
@@ -292,3 +294,8 @@ func copyOutput(r io.Reader, doneCh chan<- struct{}) {
 
 	wg.Wait()
 }
+
+func init() {
+	// Seed the random number generator
+	rand.Seed(time.Now().UTC().UnixNano())
+}

main_test.go

@@ -1,6 +1,7 @@
 package main
 
 import (
+	"math/rand"
 	"reflect"
 	"testing"
 )
@@ -33,3 +34,9 @@ func TestExtractMachineReadable(t *testing.T) {
 		t.Fatal("should be mr")
 	}
 }
+
+func TestRandom(t *testing.T) {
+	if rand.Intn(9999999) == 8498210 {
+		t.Fatal("math.rand is not seeded properly")
+	}
+}

packer/plugin/server.go

@@ -13,12 +13,14 @@ import (
 	packrpc "github.com/mitchellh/packer/packer/rpc"
 	"io/ioutil"
 	"log"
+	"math/rand"
 	"net"
 	"os"
 	"os/signal"
 	"runtime"
 	"strconv"
 	"sync/atomic"
+	"time"
 )
 
 // This is a count of the number of interrupts the process has received.
@@ -138,3 +140,8 @@ func serverListener_unix() (net.Listener, error) {
 
 	return net.Listen("unix", path)
 }
+
+func init() {
+	// Seed the random number generator
+	rand.Seed(time.Now().UTC().UnixNano())
+}

packer/plugin/server_test.go

@@ -0,0 +1,12 @@
+package plugin
+
+import (
+	"math/rand"
+	"testing"
+)
+
+func TestPluginServerRandom(t *testing.T) {
+	if rand.Intn(9999999) == 8498210 {
+		t.Fatal("math.rand is not seeded properly")
+	}
+}