Fix rand.Seed() deprecation in golang 1.20

Ref: https://pkg.go.dev/math/rand@go1.20#Seed

Note: For `runtime_test.go`, this test-case was never actually doing
what appears as it's intent .  Fixing it to work as intended would be
require incredibly libpod-invasive changes.  Do the least-worse thing and
simply confirm that consecutive generated names are different.

Signed-off-by: Chris Evich <cevich@redhat.com>

libpod/runtime.go

@@ -5,7 +5,6 @@ import (
 	"context"
 	"errors"
 	"fmt"
-	"math/rand"
 	"os"
 	"path/filepath"
 	"strings"
@@ -118,13 +117,6 @@ type Runtime struct {
 	secretsManager *secrets.SecretsManager
 }
 
-func init() {
-	// generateName calls namesgenerator.GetRandomName which the
-	// global RNG from math/rand. Seed it here to make sure we
-	// don't get the same name every time.
-	rand.Seed(time.Now().UnixNano())
-}
-
 // SetXdgDirs ensures the XDG_RUNTIME_DIR env and XDG_CONFIG_HOME variables are set.
 // containers/image uses XDG_RUNTIME_DIR to locate the auth file, XDG_CONFIG_HOME is
 // use for the containers.conf configuration file.

libpod/runtime_pre_go1.20.go

@@ -0,0 +1,18 @@
+// In go 1.20 and later, the global RNG is automatically initialized.
+// Ref: https://pkg.go.dev/math/rand@go1.20#Seed
+//go:build !go1.20
+// +build !go1.20
+
+package libpod
+
+import (
+	"math/rand"
+	"time"
+)
+
+func init() {
+	// generateName calls namesgenerator.GetRandomName which the
+	// global RNG from math/rand. Seed it here to make sure we
+	// don't get the same name every time.
+	rand.Seed(time.Now().UnixNano())
+}

libpod/runtime_test.go

@@ -1,7 +1,6 @@
 package libpod
 
 import (
-	"math/rand"
 	"os"
 	"testing"
 
@@ -19,10 +18,8 @@ func Test_generateName(t *testing.T) {
 	}
 
 	// Test that (*Runtime).generateName returns different names
-	// if called twice, even if the global RNG has the default
-	// seed.
+	// if called twice.
 	n1, _ := r.generateName()
-	rand.Seed(1)
 	n2, _ := r.generateName()
 	assert.NotEqual(t, n1, n2)
 }

test/e2e/common_test.go

@@ -430,11 +430,11 @@ func GetPortLock(port string) *lockfile.LockFile {
 // collisions during parallel tests
 func GetRandomIPAddress() string {
 	// To avoid IP collisions of initialize random seed for random IP addresses
-	rand.Seed(time.Now().UnixNano())
+	rng := rand.New(rand.NewSource(time.Now().UnixNano()))
 	// Add GinkgoParallelProcess() on top of the IP address
 	// in case of the same random seed
-	ip3 := strconv.Itoa(rand.Intn(230) + GinkgoParallelProcess())
-	ip4 := strconv.Itoa(rand.Intn(230) + GinkgoParallelProcess())
+	ip3 := strconv.Itoa(rng.Intn(230) + GinkgoParallelProcess())
+	ip4 := strconv.Itoa(rng.Intn(230) + GinkgoParallelProcess())
 	return "10.88." + ip3 + "." + ip4
 }