Method Open

echo.go:880–894

(name string)

}

func (fs defaultFS) Open(name string) (fs.File, error) {
	// fs.FS.Open() already assumes that file names are relative to FS root path and considers name with prefix `/` as invalid
	// For example `f.Name()` returns file names as absolute paths (e.g. `/tmp/data.csv`) so in case user wants to open
	// a file with an absolute path we need to remove prefix and then call fs.FS.Open().
	// not to force users to cut prefix from file name we do it here.
	if filepath.IsAbs(name) {
		if strings.HasPrefix(name, fs.prefix) {
			name = name[len(fs.prefix):]
			if len(name) > 1 && os.IsPathSeparator(name[0]) {
				name = name[1:]
			}
		}
	}
	return fs.fs.Open(name)
}

func subFS(currentFs fs.FS, root string) (fs.FS, error) {
	root = filepath.ToSlash(filepath.Clean(root)) // note: fs.FS operates only with slashes. `ToSlash` is necessary for Windows