chore(deps): bump github.com/go-git/go-billy/v5 from 5.7.0 to 5.9.0

Bumps [github.com/go-git/go-billy/v5](https://github.com/go-git/go-billy) from 5.7.0 to 5.9.0.
- [Release notes](https://github.com/go-git/go-billy/releases)
- [Commits](https://github.com/go-git/go-billy/compare/v5.7.0...v5.9.0)

---
updated-dependencies:
- dependency-name: github.com/go-git/go-billy/v5
  dependency-version: 5.9.0
  dependency-type: indirect
...

Signed-off-by: dependabot[bot] <support@github.com>

vendor/github.com/go-git/go-billy/v5/osfs/os_bound.go

@@ -20,6 +20,7 @@
 package osfs
 
 import (
+	"errors"
 	"fmt"
 	"os"
 	"path/filepath"
@@ -29,6 +30,31 @@ import (
 	"github.com/go-git/go-billy/v5"
 )
 
+var (
+	// ErrBaseDirCannotBeRemoved is returned when removing the BoundOS base dir.
+	ErrBaseDirCannotBeRemoved = errors.New("base dir cannot be removed")
+
+	// ErrBaseDirCannotBeRenamed is returned when renaming the BoundOS base dir.
+	ErrBaseDirCannotBeRenamed = errors.New("base dir cannot be renamed")
+
+	dotPrefixes   = dotPathPrefixes()
+	dotSeparators = dotPathSeparators()
+)
+
+func dotPathPrefixes() []string {
+	if filepath.Separator == '\\' {
+		return []string{"./", ".\\"}
+	}
+	return []string{"./"}
+}
+
+func dotPathSeparators() string {
+	if filepath.Separator == '\\' {
+		return `/\`
+	}
+	return `/`
+}
+
 // BoundOS is a fs implementation based on the OS filesystem which is bound to
 // a base dir.
 // Prefer this fs implementation over ChrootOS.
@@ -54,6 +80,7 @@ func (fs *BoundOS) Create(filename string) (billy.File, error) {
 }
 
 func (fs *BoundOS) OpenFile(filename string, flag int, perm os.FileMode) (billy.File, error) {
+	filename = fs.expandDot(filename)
 	fn, err := fs.abs(filename)
 	if err != nil {
 		return nil, err
@@ -62,6 +89,7 @@ func (fs *BoundOS) OpenFile(filename string, flag int, perm os.FileMode) (billy.
 }
 
 func (fs *BoundOS) ReadDir(path string) ([]os.FileInfo, error) {
+	path = fs.expandDot(path)
 	dir, err := fs.abs(path)
 	if err != nil {
 		return nil, err
@@ -71,6 +99,12 @@ func (fs *BoundOS) ReadDir(path string) ([]os.FileInfo, error) {
 }
 
 func (fs *BoundOS) Rename(from, to string) error {
+	if fs.isBaseDir(from) {
+		return ErrBaseDirCannotBeRenamed
+	}
+	from = fs.expandDot(from)
+	to = fs.expandDot(to)
+
 	f, err := fs.abs(from)
 	if err != nil {
 		return err
@@ -89,6 +123,7 @@ func (fs *BoundOS) Rename(from, to string) error {
 }
 
 func (fs *BoundOS) MkdirAll(path string, perm os.FileMode) error {
+	path = fs.expandDot(path)
 	dir, err := fs.abs(path)
 	if err != nil {
 		return err
@@ -101,6 +136,7 @@ func (fs *BoundOS) Open(filename string) (billy.File, error) {
 }
 
 func (fs *BoundOS) Stat(filename string) (os.FileInfo, error) {
+	filename = fs.expandDot(filename)
 	filename, err := fs.abs(filename)
 	if err != nil {
 		return nil, err
@@ -109,6 +145,11 @@ func (fs *BoundOS) Stat(filename string) (os.FileInfo, error) {
 }
 
 func (fs *BoundOS) Remove(filename string) error {
+	if fs.isBaseDir(filename) {
+		return ErrBaseDirCannotBeRemoved
+	}
+	filename = fs.expandDot(filename)
+
 	fn, err := fs.abs(filename)
 	if err != nil {
 		return err
@@ -122,10 +163,19 @@ func (fs *BoundOS) Remove(filename string) error {
 func (fs *BoundOS) TempFile(dir, prefix string) (billy.File, error) {
 	if dir != "" {
 		var err error
+		dir = fs.expandDot(dir)
 		dir, err = fs.abs(dir)
 		if err != nil {
 			return nil, err
 		}
+
+		_, err = os.Stat(dir)
+		if err != nil && os.IsNotExist(err) {
+			err = os.MkdirAll(dir, defaultDirectoryMode)
+			if err != nil {
+				return nil, err
+			}
+		}
 	}
 
 	return tempFile(dir, prefix)
@@ -136,6 +186,11 @@ func (fs *BoundOS) Join(elem ...string) string {
 }
 
 func (fs *BoundOS) RemoveAll(path string) error {
+	if fs.isBaseDir(path) {
+		return ErrBaseDirCannotBeRemoved
+	}
+	path = fs.expandDot(path)
+
 	dir, err := fs.abs(path)
 	if err != nil {
 		return err
@@ -144,6 +199,7 @@ func (fs *BoundOS) RemoveAll(path string) error {
 }
 
 func (fs *BoundOS) Symlink(target, link string) error {
+	link = fs.expandDot(link)
 	ln, err := fs.abs(link)
 	if err != nil {
 		return err
@@ -156,6 +212,7 @@ func (fs *BoundOS) Symlink(target, link string) error {
 }
 
 func (fs *BoundOS) Lstat(filename string) (os.FileInfo, error) {
+	filename = fs.expandDot(filename)
 	filename = filepath.Clean(filename)
 	if !filepath.IsAbs(filename) {
 		filename = filepath.Join(fs.baseDir, filename)
@@ -167,6 +224,7 @@ func (fs *BoundOS) Lstat(filename string) (os.FileInfo, error) {
 }
 
 func (fs *BoundOS) Readlink(link string) (string, error) {
+	link = fs.expandDot(link)
 	if !filepath.IsAbs(link) {
 		link = filepath.Clean(filepath.Join(fs.baseDir, link))
 	}
@@ -177,6 +235,7 @@ func (fs *BoundOS) Readlink(link string) (string, error) {
 }
 
 func (fs *BoundOS) Chmod(path string, mode os.FileMode) error {
+	path = fs.expandDot(path)
 	abspath, err := fs.abs(path)
 	if err != nil {
 		return err
@@ -191,7 +250,7 @@ func (fs *BoundOS) Chroot(path string) (billy.Filesystem, error) {
 	if err != nil {
 		return nil, err
 	}
-	return New(joined), nil
+	return New(joined, WithBoundOS()), nil
 }
 
 // Root returns the current base dir of the billy.Filesystem.
@@ -212,6 +271,37 @@ func (fs *BoundOS) createDir(fullpath string) error {
 	return nil
 }
 
+func (fs *BoundOS) expandDot(path string) string {
+	if path == "." {
+		return fs.baseDir
+	}
+	for _, prefix := range dotPrefixes {
+		if strings.HasPrefix(path, prefix) {
+			path = strings.TrimLeft(strings.TrimPrefix(path, prefix), dotSeparators)
+			if path == "" {
+				return fs.baseDir
+			}
+			return path
+		}
+	}
+	return path
+}
+
+func (fs *BoundOS) isBaseDir(path string) bool {
+	if path == "" || filepath.Clean(path) == "." {
+		return true
+	}
+	path = fs.expandDot(path)
+	if filepath.Clean(path) == filepath.Clean(fs.baseDir) {
+		return true
+	}
+	abspath, err := fs.abs(path)
+	if err != nil {
+		return false
+	}
+	return filepath.Clean(abspath) == filepath.Clean(fs.baseDir)
+}
+
 // abs transforms filename to an absolute path, taking into account the base dir.
 // Relative paths won't be allowed to ascend the base dir, so `../file` will become
 // `/working-dir/file`.
@@ -225,7 +315,7 @@ func (fs *BoundOS) abs(filename string) (string, error) {
 
 	path, err := securejoin.SecureJoin(fs.baseDir, filename)
 	if err != nil {
-		return "", nil
+		return "", err
 	}
 
 	if fs.deduplicatePath {
@@ -238,24 +328,12 @@ func (fs *BoundOS) abs(filename string) (string, error) {
 	return path, nil
 }
 
-// insideBaseDir checks whether filename is located within
-// the fs.baseDir.
-func (fs *BoundOS) insideBaseDir(filename string) (bool, error) {
-	if filename == fs.baseDir {
-		return true, nil
-	}
-	if !strings.HasPrefix(filename, fs.baseDir+string(filepath.Separator)) {
-		return false, fmt.Errorf("path outside base dir")
-	}
-	return true, nil
-}
-
 // insideBaseDirEval checks whether filename is contained within
 // a dir that is within the fs.baseDir, by first evaluating any symlinks
 // that either filename or fs.baseDir may contain.
 func (fs *BoundOS) insideBaseDirEval(filename string) (bool, error) {
 	// "/" contains all others.
-	if fs.baseDir == "/" {
+	if fs.baseDir == "/" || fs.baseDir == filename {
 		return true, nil
 	}
 	dir, err := filepath.EvalSymlinks(filepath.Dir(filename))