cipd: instance cache

client/cmd/cipd/main.go

Index: client/cmd/cipd/main.go
diff --git a/client/cmd/cipd/main.go b/client/cmd/cipd/main.go
index 94d63001d897c5a63973e8d61e6e92340c72182a..47e15cc424cabf9ce2fbb3390ce5e7d80fecf49c 100644
--- a/client/cmd/cipd/main.go
+++ b/client/cmd/cipd/main.go
@@ -13,6 +13,7 @@ import (
 	"flag"
 	"fmt"
 	"io/ioutil"
+	"math/rand"
 	"net/http"
 	"os"
 	"path/filepath"
@@ -1671,5 +1672,6 @@ func fixFlagsPosition(args []string) []string {
 }
 
 func main() {
+	rand.Seed(time.Now().Unix())

[Vadim Sh., 2016/04/11 16:52:03]

I was bit in the ass by this construct. Multiple processes may start in exact
same second.

Seed from crypto/rand instead, e.g.

	var seed int64
	if err := binary.Read(cryptorand.Reader, binary.LittleEndian, &seed); err !=
nil {
		panic(err)
	}
	rand.Seed(seed)

[nodir, 2016/04/11 22:16:16]

Done.

 	os.Exit(subcommands.Run(application, fixFlagsPosition(os.Args[1:])))
 }