Replace stringid with simple rand reader

Signed-off-by: Derek McGowan <derek@mcgstyle.net>

cmd/containerd/containerd.go

@@ -18,7 +18,9 @@ package main
 
 import (
 	"fmt"
+	"math/rand"
 	"os"
+	"time"
 
 	_ "github.com/containerd/containerd/diff/walking/plugin"
 	_ "github.com/containerd/containerd/gc/scheduler"
@@ -43,6 +45,10 @@ import (
 	"github.com/sirupsen/logrus"
 )
 
+func init() {
+	rand.Seed(time.Now().UnixNano())
+}
+
 func main() {
 	app := command.App()
 	logrus.Warn("This customized containerd is only for CI test, DO NOT use it for distribution.")

cmd/ctr/main.go

@@ -18,13 +18,19 @@ package main
 
 import (
 	"fmt"
+	"math/rand"
 	"os"
+	"time"
 
 	ctrapp "github.com/containerd/containerd/cmd/ctr/app"
 
 	cricli "github.com/containerd/cri/cli"
 )
 
+func init() {
+	rand.Seed(time.Now().UnixNano())
+}
+
 func main() {
 	app := ctrapp.New()
 	app.Commands = append(app.Commands, cricli.Command)

pkg/util/id.go

@@ -16,9 +16,14 @@ limitations under the License.
 
 package util
 
-import "github.com/docker/docker/pkg/stringid"
+import (
+	"encoding/hex"
+	"math/rand"
+)
 
 // GenerateID generates a random unique id.
 func GenerateID() string {
-	return stringid.GenerateNonCryptoID()
+	b := make([]byte, 32)
+	rand.Read(b)
+	return hex.EncodeToString(b)
 }

vendor/github.com/docker/docker/pkg/stringid/README.md

@@ -1 +0,0 @@
-This package provides helper functions for dealing with string identifiers

vendor/github.com/docker/docker/pkg/stringid/stringid.go

@@ -1,99 +0,0 @@
-// Package stringid provides helper functions for dealing with string identifiers
-package stringid
-
-import (
-	cryptorand "crypto/rand"
-	"encoding/hex"
-	"fmt"
-	"io"
-	"math"
-	"math/big"
-	"math/rand"
-	"regexp"
-	"strconv"
-	"strings"
-	"time"
-)
-
-const shortLen = 12
-
-var (
-	validShortID = regexp.MustCompile("^[a-f0-9]{12}$")
-	validHex     = regexp.MustCompile(`^[a-f0-9]{64}$`)
-)
-
-// IsShortID determines if an arbitrary string *looks like* a short ID.
-func IsShortID(id string) bool {
-	return validShortID.MatchString(id)
-}
-
-// TruncateID returns a shorthand version of a string identifier for convenience.
-// A collision with other shorthands is very unlikely, but possible.
-// In case of a collision a lookup with TruncIndex.Get() will fail, and the caller
-// will need to use a longer prefix, or the full-length Id.
-func TruncateID(id string) string {
-	if i := strings.IndexRune(id, ':'); i >= 0 {
-		id = id[i+1:]
-	}
-	if len(id) > shortLen {
-		id = id[:shortLen]
-	}
-	return id
-}
-
-func generateID(r io.Reader) string {
-	b := make([]byte, 32)
-	for {
-		if _, err := io.ReadFull(r, b); err != nil {
-			panic(err) // This shouldn't happen
-		}
-		id := hex.EncodeToString(b)
-		// if we try to parse the truncated for as an int and we don't have
-		// an error then the value is all numeric and causes issues when
-		// used as a hostname. ref #3869
-		if _, err := strconv.ParseInt(TruncateID(id), 10, 64); err == nil {
-			continue
-		}
-		return id
-	}
-}
-
-// GenerateRandomID returns a unique id.
-func GenerateRandomID() string {
-	return generateID(cryptorand.Reader)
-}
-
-// GenerateNonCryptoID generates unique id without using cryptographically
-// secure sources of random.
-// It helps you to save entropy.
-func GenerateNonCryptoID() string {
-	return generateID(readerFunc(rand.Read))
-}
-
-// ValidateID checks whether an ID string is a valid image ID.
-func ValidateID(id string) error {
-	if ok := validHex.MatchString(id); !ok {
-		return fmt.Errorf("image ID %q is invalid", id)
-	}
-	return nil
-}
-
-func init() {
-	// safely set the seed globally so we generate random ids. Tries to use a
-	// crypto seed before falling back to time.
-	var seed int64
-	if cryptoseed, err := cryptorand.Int(cryptorand.Reader, big.NewInt(math.MaxInt64)); err != nil {
-		// This should not happen, but worst-case fallback to time-based seed.
-		seed = time.Now().UnixNano()
-	} else {
-		seed = cryptoseed.Int64()
-	}
-
-	rand.Seed(seed)
-}
-
-type readerFunc func(p []byte) (int, error)
-
-func (fn readerFunc) Read(p []byte) (int, error) {
-	return fn(p)
-}