fs: clean up helper functions

internal/archiver/archiver.go

@@ -446,7 +446,7 @@ func (arch *Archiver) save(ctx context.Context, snPath, target string, previous
 	}
 
 	switch {
-	case fs.IsRegularFile(fi):
+	case fi.Mode().IsRegular():
 		debug.Log("  %v regular file", target)
 
 		// check if the file has not changed before performing a fopen operation (more expensive, specially
@@ -505,7 +505,7 @@ func (arch *Archiver) save(ctx context.Context, snPath, target string, previous
 		}
 
 		// make sure it's still a file
-		if !fs.IsRegularFile(fi) {
+		if !fi.Mode().IsRegular() {
 			err = errors.Errorf("file %v changed type, refusing to archive", fi.Name())
 			_ = file.Close()
 			err = arch.error(abstarget, err)

internal/archiver/testing.go

@@ -169,7 +169,7 @@ func TestEnsureFiles(t testing.TB, target string, dir TestDir) {
 			}
 			return nil
 		case TestFile:
-			if !fs.IsRegularFile(fi) {
+			if !fi.Mode().IsRegular() {
 				t.Errorf("is not a regular file: %v", path)
 				return nil
 			}
@@ -208,7 +208,7 @@ func TestEnsureFiles(t testing.TB, target string, dir TestDir) {
 	})
 
 	// then, traverse the directory again, looking for additional files
-	err := fs.Walk(target, func(path string, fi os.FileInfo, err error) error {
+	err := filepath.Walk(target, func(path string, fi os.FileInfo, err error) error {
 		if err != nil {
 			return err
 		}

internal/archiver/testing_test.go

@@ -122,7 +122,7 @@ func TestTestCreateFiles(t *testing.T) {
 
 				switch node := item.(type) {
 				case TestFile:
-					if !fs.IsRegularFile(fi) {
+					if !fi.Mode().IsRegular() {
 						t.Errorf("is not regular file: %v", name)
 						continue
 					}

internal/fs/file.go

@@ -3,7 +3,6 @@ package fs
 import (
 	"fmt"
 	"os"
-	"path/filepath"
 	"time"
 )
 
@@ -75,15 +74,6 @@ func Lstat(name string) (os.FileInfo, error) {
 	return os.Lstat(fixpath(name))
 }
 
-// Create creates the named file with mode 0666 (before umask), truncating
-// it if it already exists. If successful, methods on the returned
-// File can be used for I/O; the associated file descriptor has mode
-// O_RDWR.
-// If there is an error, it will be of type *PathError.
-func Create(name string) (*os.File, error) {
-	return os.Create(fixpath(name))
-}
-
 // Open opens a file for reading.
 func Open(name string) (File, error) {
 	return os.Open(fixpath(name))
@@ -98,16 +88,6 @@ func OpenFile(name string, flag int, perm os.FileMode) (*os.File, error) {
 	return os.OpenFile(fixpath(name), flag, perm)
 }
 
-// Walk walks the file tree rooted at root, calling walkFn for each file or
-// directory in the tree, including root. All errors that arise visiting files
-// and directories are filtered by walkFn. The files are walked in lexical
-// order, which makes the output deterministic but means that for very
-// large directories Walk can be inefficient.
-// Walk does not follow symbolic links.
-func Walk(root string, walkFn filepath.WalkFunc) error {
-	return filepath.Walk(fixpath(root), walkFn)
-}
-
 // RemoveIfExists removes a file, returning no error if it does not exist.
 func RemoveIfExists(filename string) error {
 	err := os.Remove(filename)

internal/fs/helpers.go

@@ -1,13 +0,0 @@
-package fs
-
-import "os"
-
-// IsRegularFile returns true if fi belongs to a normal file. If fi is nil,
-// false is returned.
-func IsRegularFile(fi os.FileInfo) bool {
-	if fi == nil {
-		return false
-	}
-
-	return fi.Mode()&os.ModeType == 0
-}