Switch all calls to filepath.Walk to filepath.WalkDir

WalkDir should be faster the Walk, since we often do
not need to stat files.

[NO NEW TESTS NEEDED] Existing tests should find errors.

Signed-off-by: Daniel J Walsh <dwalsh@redhat.com>

11 files changed, 68 insertions, 57 deletions

diff --git a/libpod/container_internal.go b/libpod/container_internal.go
index b7362e7fb..0db59f2fe 100644
--- a/libpod/container_internal.go
+++ b/libpod/container_internal.go
@@ -99,15 +99,8 @@ func (c *Container) rootFsSize() (int64, error) {
 // rwSize gets the size of the mutable top layer of the container.
 func (c *Container) rwSize() (int64, error) {
 	if c.config.Rootfs != "" {
-		var size int64
-		err := filepath.Walk(c.config.Rootfs, func(path string, info os.FileInfo, err error) error {
-			if err != nil {
-				return err
-			}
-			size += info.Size()
-			return nil
-		})
-		return size, err
+		size, err := util.SizeOfPath(c.config.Rootfs)
+		return int64(size), err
 	}
 
 	container, err := c.runtime.store.Container(c.ID())
diff --git a/libpod/volume.go b/libpod/volume.go
index f79ceaa87..bffafdc15 100644
--- a/libpod/volume.go
+++ b/libpod/volume.go
@@ -1,13 +1,12 @@
 package libpod
 
 import (
-	"os"
-	"path/filepath"
 	"time"
 
 	"github.com/containers/podman/v4/libpod/define"
 	"github.com/containers/podman/v4/libpod/lock"
 	"github.com/containers/podman/v4/libpod/plugin"
+	"github.com/containers/podman/v4/pkg/util"
 )
 
 // Volume is a libpod named volume.
@@ -93,14 +92,7 @@ func (v *Volume) Name() string {
 
 // Returns the size on disk of volume
 func (v *Volume) Size() (uint64, error) {
-	var size uint64
-	err := filepath.Walk(v.config.MountPoint, func(path string, info os.FileInfo, err error) error {
-		if err == nil && !info.IsDir() {
-			size += (uint64)(info.Size())
-		}
-		return err
-	})
-	return size, err
+	return util.SizeOfPath(v.config.MountPoint)
 }
 
 // Driver retrieves the volume's driver.
diff --git a/pkg/bindings/images/build.go b/pkg/bindings/images/build.go
index e1b427742..f6739b7ca 100644
--- a/pkg/bindings/images/build.go
+++ b/pkg/bindings/images/build.go
@@ -7,6 +7,7 @@ import (
 	"encoding/json"
 	"fmt"
 	"io"
+	"io/fs"
 	"io/ioutil"
 	"net/http"
 	"net/url"
@@ -557,14 +558,14 @@ func nTar(excludes []string, sources ...string) (io.ReadCloser, error) {
 				merr = multierror.Append(merr, err)
 				return
 			}
-			err = filepath.Walk(s, func(path string, info os.FileInfo, err error) error {
+			err = filepath.WalkDir(s, func(path string, d fs.DirEntry, err error) error {
 				if err != nil {
 					return err
 				}
 
 				// check if what we are given is an empty dir, if so then continue w/ it. Else return.
 				// if we are given a file or a symlink, we do not want to exclude it.
-				if info.IsDir() && s == path {
+				if d.IsDir() && s == path {
 					var p *os.File
 					p, err = os.Open(path)
 					if err != nil {
@@ -588,7 +589,11 @@ func nTar(excludes []string, sources ...string) (io.ReadCloser, error) {
 					return nil
 				}
 
-				if info.Mode().IsRegular() { // add file item
+				if d.Type().IsRegular() { // add file item
+					info, err := d.Info()
+					if err != nil {
+						return err
+					}
 					di, isHardLink := checkHardLink(info)
 					if err != nil {
 						return err
@@ -624,7 +629,11 @@ func nTar(excludes []string, sources ...string) (io.ReadCloser, error) {
 						seen[di] = name
 					}
 					return err
-				} else if info.Mode().IsDir() { // add folders
+				} else if d.IsDir() { // add folders
+					info, err := d.Info()
+					if err != nil {
+						return err
+					}
 					hdr, lerr := tar.FileInfoHeader(info, name)
 					if lerr != nil {
 						return lerr
@@ -634,11 +643,15 @@ func nTar(excludes []string, sources ...string) (io.ReadCloser, error) {
 					if lerr := tw.WriteHeader(hdr); lerr != nil {
 						return lerr
 					}
-				} else if info.Mode()&os.ModeSymlink != 0 { // add symlinks as it, not content
+				} else if d.Type()&os.ModeSymlink != 0 { // add symlinks as it, not content
 					link, err := os.Readlink(path)
 					if err != nil {
 						return err
 					}
+					info, err := d.Info()
+					if err != nil {
+						return err
+					}
 					hdr, lerr := tar.FileInfoHeader(info, link)
 					if lerr != nil {
 						return lerr
diff --git a/pkg/domain/infra/abi/system.go b/pkg/domain/infra/abi/system.go
index d12d14c1f..4361821d5 100644
--- a/pkg/domain/infra/abi/system.go
+++ b/pkg/domain/infra/abi/system.go
@@ -6,7 +6,6 @@ import (
 	"net/url"
 	"os"
 	"os/exec"
-	"path/filepath"
 
 	"github.com/containers/common/pkg/cgroups"
 	"github.com/containers/common/pkg/config"
@@ -269,7 +268,7 @@ func (ic *ContainerEngine) SystemDf(ctx context.Context, options entities.System
 	}
 
 	dfVolumes := make([]*entities.SystemDfVolumeReport, 0, len(vols))
-	var reclaimableSize int64
+	var reclaimableSize uint64
 	for _, v := range vols {
 		var consInUse int
 		mountPoint, err := v.MountPoint()
@@ -282,7 +281,7 @@ func (ic *ContainerEngine) SystemDf(ctx context.Context, options entities.System
 			// TODO: fix this.
 			continue
 		}
-		volSize, err := sizeOfPath(mountPoint)
+		volSize, err := util.SizeOfPath(mountPoint)
 		if err != nil {
 			return nil, err
 		}
@@ -301,8 +300,8 @@ func (ic *ContainerEngine) SystemDf(ctx context.Context, options entities.System
 		report := entities.SystemDfVolumeReport{
 			VolumeName:      v.Name(),
 			Links:           consInUse,
-			Size:            volSize,
-			ReclaimableSize: reclaimableSize,
+			Size:            int64(volSize),
+			ReclaimableSize: int64(reclaimableSize),
 		}
 		dfVolumes = append(dfVolumes, &report)
 	}
@@ -313,19 +312,6 @@ func (ic *ContainerEngine) SystemDf(ctx context.Context, options entities.System
 	}, nil
 }
 
-// sizeOfPath determines the file usage of a given path. it was called volumeSize in v1
-// and now is made to be generic and take a path instead of a libpod volume
-func sizeOfPath(path string) (int64, error) {
-	var size int64
-	err := filepath.Walk(path, func(path string, info os.FileInfo, err error) error {
-		if err == nil && !info.IsDir() {
-			size += info.Size()
-		}
-		return err
-	})
-	return size, err
-}
-
 func (se *SystemEngine) Reset(ctx context.Context) error {
 	return se.Libpod.Reset(ctx)
 }
diff --git a/pkg/machine/ignition.go b/pkg/machine/ignition.go
index b2dabb689..fe47437e3 100644
--- a/pkg/machine/ignition.go
+++ b/pkg/machine/ignition.go
@@ -6,6 +6,7 @@ package machine
 import (
 	"encoding/json"
 	"fmt"
+	"io/fs"
 	"io/ioutil"
 	"net/url"
 	"os"
@@ -507,8 +508,8 @@ func getCerts(certsDir string, isDir bool) []File {
 	)
 
 	if isDir {
-		err := filepath.Walk(certsDir, func(path string, info os.FileInfo, err error) error {
-			if err == nil && !info.IsDir() {
+		err := filepath.WalkDir(certsDir, func(path string, d fs.DirEntry, err error) error {
+			if err == nil && !d.IsDir() {
 				certPath, err := filepath.Rel(certsDir, path)
 				if err != nil {
 					logrus.Warnf("%s", err)
diff --git a/pkg/machine/qemu/machine.go b/pkg/machine/qemu/machine.go
index ffc90b2a0..f04625781 100644
--- a/pkg/machine/qemu/machine.go
+++ b/pkg/machine/qemu/machine.go
@@ -895,10 +895,10 @@ func GetVMInfos() ([]*machine.ListResponse, error) {
 
 	var listed []*machine.ListResponse
 
-	if err = filepath.Walk(vmConfigDir, func(path string, info os.FileInfo, err error) error {
+	if err = filepath.WalkDir(vmConfigDir, func(path string, d fs.DirEntry, err error) error {
 		vm := new(MachineVM)
-		if strings.HasSuffix(info.Name(), ".json") {
-			fullPath := filepath.Join(vmConfigDir, info.Name())
+		if strings.HasSuffix(d.Name(), ".json") {
+			fullPath := filepath.Join(vmConfigDir, d.Name())
 			b, err := ioutil.ReadFile(fullPath)
 			if err != nil {
 				return err
diff --git a/pkg/machine/wsl/machine.go b/pkg/machine/wsl/machine.go
index 5b0c757f0..5128fa313 100644
--- a/pkg/machine/wsl/machine.go
+++ b/pkg/machine/wsl/machine.go
@@ -8,6 +8,7 @@ import (
 	"encoding/json"
 	"fmt"
 	"io"
+	"io/fs"
 	"io/ioutil"
 	"net/url"
 	"os"
@@ -1175,10 +1176,10 @@ func GetVMInfos() ([]*machine.ListResponse, error) {
 
 	var listed []*machine.ListResponse
 
-	if err = filepath.Walk(vmConfigDir, func(path string, info os.FileInfo, err error) error {
+	if err = filepath.WalkDir(vmConfigDir, func(path string, d fs.DirEntry, err error) error {
 		vm := new(MachineVM)
-		if strings.HasSuffix(info.Name(), ".json") {
-			fullPath := filepath.Join(vmConfigDir, info.Name())
+		if strings.HasSuffix(d.Name(), ".json") {
+			fullPath := filepath.Join(vmConfigDir, d.Name())
 			b, err := ioutil.ReadFile(fullPath)
 			if err != nil {
 				return err
diff --git a/pkg/specgen/generate/config_linux.go b/pkg/specgen/generate/config_linux.go
index 35d7f0252..8f83fc09b 100644
--- a/pkg/specgen/generate/config_linux.go
+++ b/pkg/specgen/generate/config_linux.go
@@ -2,6 +2,7 @@ package generate
 
 import (
 	"fmt"
+	"io/fs"
 	"io/ioutil"
 	"os"
 	"path"
@@ -101,8 +102,8 @@ func DevicesFromPath(g *generate.Generator, devicePath string) error {
 		}
 
 		// mount the internal devices recursively
-		if err := filepath.Walk(resolvedDevicePath, func(dpath string, f os.FileInfo, e error) error {
-			if f.Mode()&os.ModeDevice == os.ModeDevice {
+		if err := filepath.WalkDir(resolvedDevicePath, func(dpath string, d fs.DirEntry, e error) error {
+			if d.Type()&os.ModeDevice == os.ModeDevice {
 				found = true
 				device := fmt.Sprintf("%s:%s", dpath, filepath.Join(dest, strings.TrimPrefix(dpath, src)))
 				if devmode != "" {
diff --git a/pkg/util/utils.go b/pkg/util/utils.go
index 334a44a88..b89978601 100644
--- a/pkg/util/utils.go
+++ b/pkg/util/utils.go
@@ -3,6 +3,7 @@ package util
 import (
 	"encoding/json"
 	"fmt"
+	"io/fs"
 	"math"
 	"os"
 	"os/user"
@@ -731,3 +732,20 @@ func LookupUser(name string) (*user.User, error) {
 	}
 	return user.Lookup(name)
 }
+
+// SizeOfPath determines the file usage of a given path. it was called volumeSize in v1
+// and now is made to be generic and take a path instead of a libpod volume
+func SizeOfPath(path string) (uint64, error) {
+	var size uint64
+	err := filepath.WalkDir(path, func(path string, d fs.DirEntry, err error) error {
+		if err == nil && !d.IsDir() {
+			info, err := d.Info()
+			if err != nil {
+				return err
+			}
+			size += uint64(info.Size())
+		}
+		return err
+	})
+	return size, err
+}
diff --git a/pkg/util/utils_linux.go b/pkg/util/utils_linux.go
index 1cffab19d..0b21bf3c5 100644
--- a/pkg/util/utils_linux.go
+++ b/pkg/util/utils_linux.go
@@ -2,6 +2,7 @@ package util
 
 import (
 	"fmt"
+	"io/fs"
 	"os"
 	"path/filepath"
 	"syscall"
@@ -23,17 +24,21 @@ func GetContainerPidInformationDescriptors() ([]string, error) {
 // Symlinks to nodes are ignored.
 func FindDeviceNodes() (map[string]string, error) {
 	nodes := make(map[string]string)
-	err := filepath.Walk("/dev", func(path string, info os.FileInfo, err error) error {
+	err := filepath.WalkDir("/dev", func(path string, d fs.DirEntry, err error) error {
 		if err != nil {
 			logrus.Warnf("Error descending into path %s: %v", path, err)
 			return filepath.SkipDir
 		}
 
 		// If we aren't a device node, do nothing.
-		if info.Mode()&(os.ModeDevice|os.ModeCharDevice) == 0 {
+		if d.Type()&(os.ModeDevice|os.ModeCharDevice) == 0 {
 			return nil
 		}
 
+		info, err := d.Info()
+		if err != nil {
+			return err
+		}
 		// We are a device node. Get major/minor.
 		sysstat, ok := info.Sys().(*syscall.Stat_t)
 		if !ok {
diff --git a/test/e2e/pod_rm_test.go b/test/e2e/pod_rm_test.go
index 7a0d97d28..dbb2d6d13 100644
--- a/test/e2e/pod_rm_test.go
+++ b/test/e2e/pod_rm_test.go
@@ -2,6 +2,7 @@ package integration
 
 import (
 	"fmt"
+	"io/fs"
 	"io/ioutil"
 	"os"
 	"path/filepath"
@@ -46,14 +47,14 @@ var _ = Describe("Podman pod rm", func() {
 		Expect(result).Should(Exit(0))
 
 		// Also check that we don't leak cgroups
-		err := filepath.Walk("/sys/fs/cgroup", func(path string, info os.FileInfo, err error) error {
+		err := filepath.WalkDir("/sys/fs/cgroup", func(path string, d fs.DirEntry, err error) error {
 			if err != nil {
 				return err
 			}
-			if !info.IsDir() {
+			if !d.IsDir() {
 				Expect(err).To(BeNil())
 			}
-			if strings.Contains(info.Name(), podid) {
+			if strings.Contains(d.Name(), podid) {
 				return fmt.Errorf("leaking cgroup path %s", path)
 			}
 			return nil