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// Copyright 2021, 2022 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//go:build go1.16
// +build go1.16
package runfiles
import (
"errors"
"io"
"io/fs"
"os"
"time"
)
// Open implements fs.FS.Open.
func (r *Runfiles) Open(name string) (fs.File, error) {
if !fs.ValidPath(name) {
return nil, &fs.PathError{Op: "open", Path: name, Err: fs.ErrInvalid}
}
p, err := r.Rlocation(name)
if errors.Is(err, ErrEmpty) {
return emptyFile(name), nil
}
if err != nil {
return nil, pathError("open", name, err)
}
return os.Open(p)
}
// Stat implements fs.StatFS.Stat.
func (r *Runfiles) Stat(name string) (fs.FileInfo, error) {
if !fs.ValidPath(name) {
return nil, &fs.PathError{Op: "stat", Path: name, Err: fs.ErrInvalid}
}
p, err := r.Rlocation(name)
if errors.Is(err, ErrEmpty) {
return emptyFileInfo(name), nil
}
if err != nil {
return nil, pathError("stat", name, err)
}
return os.Stat(p)
}
// ReadFile implements fs.ReadFileFS.ReadFile.
func (r *Runfiles) ReadFile(name string) ([]byte, error) {
if !fs.ValidPath(name) {
return nil, &fs.PathError{Op: "open", Path: name, Err: fs.ErrInvalid}
}
p, err := r.Rlocation(name)
if errors.Is(err, ErrEmpty) {
return nil, nil
}
if err != nil {
return nil, pathError("open", name, err)
}
return os.ReadFile(p)
}
type emptyFile string
func (f emptyFile) Stat() (fs.FileInfo, error) { return emptyFileInfo(f), nil }
func (f emptyFile) Read([]byte) (int, error) { return 0, io.EOF }
func (emptyFile) Close() error { return nil }
type emptyFileInfo string
func (i emptyFileInfo) Name() string { return string(i) }
func (emptyFileInfo) Size() int64 { return 0 }
func (emptyFileInfo) Mode() fs.FileMode { return 0444 }
func (emptyFileInfo) ModTime() time.Time { return time.Time{} }
func (emptyFileInfo) IsDir() bool { return false }
func (emptyFileInfo) Sys() interface{} { return nil }
func pathError(op, name string, err error) error {
if err == nil {
return nil
}
var rerr Error
if errors.As(err, &rerr) {
// Unwrap the error because we don’t need the failing name
// twice.
return &fs.PathError{Op: op, Path: rerr.Name, Err: rerr.Err}
}
return &fs.PathError{Op: op, Path: name, Err: err}
}
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