refactor: use `os.ReadDir` for lightweight directory reading

`os.ReadDir` was added in Go 1.16 as part of the deprecation of `ioutil`
package. It is a more efficient implementation than `ioutil.ReadDir`.

Reference: https://pkg.go.dev/io/ioutil#ReadDir
Signed-off-by: Eng Zer Jun <engzerjun@gmail.com>

11 files changed, 13 insertions, 18 deletions

diff --git a/libpod/container_internal.go b/libpod/container_internal.go
index 32674235a..227bb7f1f 100644
--- a/libpod/container_internal.go
+++ b/libpod/container_internal.go
@@ -1671,7 +1671,7 @@ func (c *Container) mountNamedVolume(v *ContainerNamedVolume, mountpoint string)
 		// a bizarre issue where something copier.Get will ENOENT on
 		// empty directories and sometimes it will not.
 		// RHBZ#1928643
-		srcContents, err := ioutil.ReadDir(srcDir)
+		srcContents, err := os.ReadDir(srcDir)
 		if err != nil {
 			return nil, fmt.Errorf("error reading contents of source directory for copy up into volume %s: %w", vol.Name(), err)
 		}
@@ -1681,7 +1681,7 @@ func (c *Container) mountNamedVolume(v *ContainerNamedVolume, mountpoint string)
 
 		// If the volume is not empty, we should not copy up.
 		volMount := vol.mountPoint()
-		contents, err := ioutil.ReadDir(volMount)
+		contents, err := os.ReadDir(volMount)
 		if err != nil {
 			return nil, fmt.Errorf("error listing contents of volume %s mountpoint when copying up from container %s: %w", vol.Name(), c.ID(), err)
 		}
diff --git a/libpod/lock/file/file_lock.go b/libpod/lock/file/file_lock.go
index 1379e690a..55110fc0b 100644
--- a/libpod/lock/file/file_lock.go
+++ b/libpod/lock/file/file_lock.go
@@ -2,7 +2,6 @@ package file
 
 import (
 	"fmt"
-	"io/ioutil"
 	"os"
 	"path/filepath"
 	"strconv"
@@ -129,7 +128,7 @@ func (locks *FileLocks) DeallocateAllLocks() error {
 	if !locks.valid {
 		return fmt.Errorf("locks have already been closed: %w", syscall.EINVAL)
 	}
-	files, err := ioutil.ReadDir(locks.lockPath)
+	files, err := os.ReadDir(locks.lockPath)
 	if err != nil {
 		return fmt.Errorf("error reading directory %s: %w", locks.lockPath, err)
 	}
diff --git a/pkg/api/handlers/compat/info.go b/pkg/api/handlers/compat/info.go
index d82513284..60bbd40fe 100644
--- a/pkg/api/handlers/compat/info.go
+++ b/pkg/api/handlers/compat/info.go
@@ -2,7 +2,6 @@ package compat
 
 import (
 	"fmt"
-	"io/ioutil"
 	"net/http"
 	"os"
 	goRuntime "runtime"
@@ -198,7 +197,7 @@ func getRuntimes(configInfo *config.Config) map[string]docker.Runtime {
 
 func getFdCount() (count int) {
 	count = -1
-	if entries, err := ioutil.ReadDir("/proc/self/fd"); err == nil {
+	if entries, err := os.ReadDir("/proc/self/fd"); err == nil {
 		count = len(entries)
 	}
 	return
diff --git a/pkg/domain/infra/abi/containers.go b/pkg/domain/infra/abi/containers.go
index dfa3c5ba0..569fe8133 100644
--- a/pkg/domain/infra/abi/containers.go
+++ b/pkg/domain/infra/abi/containers.go
@@ -4,7 +4,6 @@ import (
 	"context"
 	"errors"
 	"fmt"
-	"io/ioutil"
 	"os"
 	"strconv"
 	"sync"
@@ -858,7 +857,7 @@ func makeExecConfig(options entities.ExecOptions, rt *libpod.Runtime) (*libpod.E
 
 func checkExecPreserveFDs(options entities.ExecOptions) error {
 	if options.PreserveFDs > 0 {
-		entries, err := ioutil.ReadDir("/proc/self/fd")
+		entries, err := os.ReadDir("/proc/self/fd")
 		if err != nil {
 			return err
 		}
diff --git a/pkg/domain/infra/abi/images.go b/pkg/domain/infra/abi/images.go
index f9839f62f..3030bac20 100644
--- a/pkg/domain/infra/abi/images.go
+++ b/pkg/domain/infra/abi/images.go
@@ -869,7 +869,7 @@ func execTransferPodman(execUser *user.User, command []string, needToTag bool) (
 
 func getSigFilename(sigStoreDirPath string) (string, error) {
 	sigFileSuffix := 1
-	sigFiles, err := ioutil.ReadDir(sigStoreDirPath)
+	sigFiles, err := os.ReadDir(sigStoreDirPath)
 	if err != nil {
 		return "", err
 	}
diff --git a/pkg/util/utils_linux.go b/pkg/util/utils_linux.go
index e2d9e3e89..7b2d98666 100644
--- a/pkg/util/utils_linux.go
+++ b/pkg/util/utils_linux.go
@@ -4,7 +4,6 @@ import (
 	"errors"
 	"fmt"
 	"io/fs"
-	"io/ioutil"
 	"os"
 	"path/filepath"
 	"strings"
@@ -119,7 +118,7 @@ func AddPrivilegedDevices(g *generate.Generator) error {
 
 // based on getDevices from runc (libcontainer/devices/devices.go)
 func getDevices(path string) ([]spec.LinuxDevice, error) {
-	files, err := ioutil.ReadDir(path)
+	files, err := os.ReadDir(path)
 	if err != nil {
 		if rootless.IsRootless() && os.IsPermission(err) {
 			return nil, nil
@@ -146,7 +145,7 @@ func getDevices(path string) ([]spec.LinuxDevice, error) {
 			}
 		case f.Name() == "console":
 			continue
-		case f.Mode()&os.ModeSymlink != 0:
+		case f.Type()&os.ModeSymlink != 0:
 			continue
 		}
 
diff --git a/test/e2e/benchmarks_test.go b/test/e2e/benchmarks_test.go
index 4be048de2..d1332665a 100644
--- a/test/e2e/benchmarks_test.go
+++ b/test/e2e/benchmarks_test.go
@@ -99,7 +99,7 @@ var _ = Describe("Podman Benchmark Suite", func() {
 	}
 
 	totalMemoryInKb := func() (total uint64) {
-		files, err := ioutil.ReadDir(timedir)
+		files, err := os.ReadDir(timedir)
 		if err != nil {
 			Fail(fmt.Sprintf("Error reading timing dir: %v", err))
 		}
diff --git a/test/e2e/container_create_volume_test.go b/test/e2e/container_create_volume_test.go
index 6d9f13694..3c54691aa 100644
--- a/test/e2e/container_create_volume_test.go
+++ b/test/e2e/container_create_volume_test.go
@@ -58,7 +58,7 @@ func checkDataVolumeContainer(pTest *PodmanTestIntegration, image, cont, dest, d
 	Expect(volList.OutputToStringArray()[0]).To(Equal(mntName))
 
 	// Check the mount source directory
-	files, err := ioutil.ReadDir(mntSource)
+	files, err := os.ReadDir(mntSource)
 	Expect(err).To(BeNil())
 
 	if data == "" {
diff --git a/test/e2e/image_sign_test.go b/test/e2e/image_sign_test.go
index 3c819a7d2..5568acc01 100644
--- a/test/e2e/image_sign_test.go
+++ b/test/e2e/image_sign_test.go
@@ -1,7 +1,6 @@
 package integration
 
 import (
-	"io/ioutil"
 	"os"
 	"os/exec"
 	"path/filepath"
@@ -69,7 +68,7 @@ var _ = Describe("Podman image sign", func() {
 		session := podmanTest.Podman([]string{"image", "sign", "--all", "--directory", sigDir, "--sign-by", "foo@bar.com", "docker://library/alpine"})
 		session.WaitWithDefaultTimeout()
 		Expect(session).Should(Exit(0))
-		fInfos, err := ioutil.ReadDir(filepath.Join(sigDir, "library"))
+		fInfos, err := os.ReadDir(filepath.Join(sigDir, "library"))
 		Expect(err).To(BeNil())
 		Expect(len(fInfos)).To(BeNumerically(">", 1), "len(fInfos)")
 	})
diff --git a/test/e2e/manifest_test.go b/test/e2e/manifest_test.go
index 60b72dcaa..e38499257 100644
--- a/test/e2e/manifest_test.go
+++ b/test/e2e/manifest_test.go
@@ -332,7 +332,7 @@ var _ = Describe("Podman manifest", func() {
 
 		blobsDir := filepath.Join(dest, "blobs", "sha256")
 
-		blobs, err := ioutil.ReadDir(blobsDir)
+		blobs, err := os.ReadDir(blobsDir)
 		Expect(err).To(BeNil())
 
 		for _, f := range blobs {
diff --git a/test/e2e/push_test.go b/test/e2e/push_test.go
index 898d21d00..a73b7c87b 100644
--- a/test/e2e/push_test.go
+++ b/test/e2e/push_test.go
@@ -78,7 +78,7 @@ var _ = Describe("Podman push", func() {
 
 		blobsDir := filepath.Join(bbdir, "blobs/sha256")
 
-		blobs, err := ioutil.ReadDir(blobsDir)
+		blobs, err := os.ReadDir(blobsDir)
 		Expect(err).To(BeNil())
 
 		for _, f := range blobs {