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package fs
import (
"fmt"
"os"
"path/filepath"
)
// RootedPath scopes file operations to the path's parent directory via os.Root.
type RootedPath struct {
path string
rootDir string
rootName string
}
// NewRootedPath returns a file path split into a trusted parent directory root
// and a relative leaf name for os.Root operations.
func NewRootedPath(path string) (RootedPath, error) {
if path == "" {
return RootedPath{}, fmt.Errorf("rooted path requires non-empty path")
}
cleanedPath := filepath.Clean(path)
if cleanedPath == "." || cleanedPath == string(filepath.Separator) {
return RootedPath{}, fmt.Errorf("rooted path requires a file path: %s", path)
}
return RootedPath{
path: path,
rootDir: filepath.Dir(cleanedPath),
rootName: filepath.Base(cleanedPath),
}, nil
}
// Name returns the rooted leaf name.
func (p RootedPath) Name() string {
return p.rootName
}
// Path returns the original file path.
func (p RootedPath) Path() string {
return p.path
}
// OpenRoot opens the rooted parent directory for this file path.
func (p RootedPath) OpenRoot() (*os.Root, error) {
root, err := os.OpenRoot(p.rootDir)
if err != nil {
return nil, fmt.Errorf("open root for %s: %w", p.path, err)
}
return root, nil
}
// ReadFile reads the rooted file contents.
func (p RootedPath) ReadFile() ([]byte, error) {
root, err := p.OpenRoot()
if err != nil {
return nil, err
}
defer root.Close()
data, err := root.ReadFile(p.rootName)
if err != nil {
return nil, fmt.Errorf("read rooted file %s: %w", p.path, err)
}
return data, nil
}
// Stat stats the rooted file.
func (p RootedPath) Stat() (os.FileInfo, error) {
root, err := p.OpenRoot()
if err != nil {
return nil, err
}
defer root.Close()
info, err := root.Stat(p.rootName)
if err != nil {
return nil, fmt.Errorf("stat rooted file %s: %w", p.path, err)
}
return info, nil
}
// WriteFile writes the rooted file contents.
func (p RootedPath) WriteFile(data []byte, perm os.FileMode) error {
root, err := p.OpenRoot()
if err != nil {
return err
}
defer root.Close()
if err := root.WriteFile(p.rootName, data, perm); err != nil {
return fmt.Errorf("write rooted file %s: %w", p.path, err)
}
return nil
}
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