69 lines
1.6 KiB
Go
69 lines
1.6 KiB
Go
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package vfscopy
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import (
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"os"
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"io"
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"path/filepath"
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"path"
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"strings"
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"errors"
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)
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// FileSystem is copied from http.FileSystem
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type FileSystem interface {
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Open(name string) (File, error)
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}
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// File is copied from http.File
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type File interface {
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io.Closer
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io.Reader
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io.Seeker
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Readdir(count int) ([]os.FileInfo, error)
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Stat() (os.FileInfo, error)
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}
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// Dir is an implementation of a Virtual FileSystem
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type Dir string
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// mapDirOpenError maps the provided non-nil error from opening name
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// to a possibly better non-nil error. In particular, it turns OS-specific errors
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// about opening files in non-directories into os.ErrNotExist. See Issue 18984.
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func mapDirOpenError(originalErr error, name string) error {
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if os.IsNotExist(originalErr) || os.IsPermission(originalErr) {
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return originalErr
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}
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parts := strings.Split(name, string(filepath.Separator))
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for i := range parts {
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if parts[i] == "" {
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continue
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}
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fi, err := os.Stat(strings.Join(parts[:i+1], string(filepath.Separator)))
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if err != nil {
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return originalErr
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}
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if !fi.IsDir() {
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return os.ErrNotExist
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}
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}
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return originalErr
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}
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// Open opens a file relative to a virtual filesystem
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func (d Dir) Open(name string) (File, error) {
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if filepath.Separator != '/' && strings.ContainsRune(name, filepath.Separator) {
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return nil, errors.New("http: invalid character in file path")
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}
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dir := string(d)
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if dir == "" {
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dir = "."
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}
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fullName := filepath.Join(dir, filepath.FromSlash(path.Clean("/"+name)))
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f, err := os.Open(fullName)
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if err != nil {
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return nil, mapDirOpenError(err, fullName)
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}
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return f, nil
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}
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