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// Copyright 2019 The Hugo Authors. All rights reserved.
//
// 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
// http://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.
package hugofs
import (
"os"
"path/filepath"
"strings"
"github.com/pkg/errors"
"github.com/spf13/afero"
)
func decorateDirs(fs afero.Fs, meta FileMeta) afero.Fs {
ffs := &baseFileDecoratorFs{Fs: fs}
decorator := func(fi os.FileInfo, name string) (os.FileInfo, error) {
if !fi.IsDir() {
// Leave regular files as they are.
return fi, nil
}
return decorateFileInfo(fi, fs, nil, "", "", meta), nil
}
ffs.decorate = decorator
return ffs
}
func decoratePath(fs afero.Fs, createPath func(name string) string) afero.Fs {
ffs := &baseFileDecoratorFs{Fs: fs}
decorator := func(fi os.FileInfo, name string) (os.FileInfo, error) {
path := createPath(name)
return decorateFileInfo(fi, fs, nil, "", path, nil), nil
}
ffs.decorate = decorator
return ffs
}
// DecorateBasePathFs adds Path info to files and directories in the
// provided BasePathFs, using the base as base.
func DecorateBasePathFs(base *afero.BasePathFs) afero.Fs {
basePath, _ := base.RealPath("")
if !strings.HasSuffix(basePath, filepathSeparator) {
basePath += filepathSeparator
}
ffs := &baseFileDecoratorFs{Fs: base}
decorator := func(fi os.FileInfo, name string) (os.FileInfo, error) {
path := strings.TrimPrefix(name, basePath)
return decorateFileInfo(fi, base, nil, "", path, nil), nil
}
ffs.decorate = decorator
return ffs
}
// NewBaseFileDecorator decorates the given Fs to provide the real filename
// and an Opener func. If
func NewBaseFileDecorator(fs afero.Fs) afero.Fs {
ffs := &baseFileDecoratorFs{Fs: fs}
decorator := func(fi os.FileInfo, filename string) (os.FileInfo, error) {
// Store away the original in case it's a symlink.
meta := FileMeta{metaKeyName: fi.Name()}
isSymlink := isSymlink(fi)
if isSymlink {
meta[metaKeyOriginalFilename] = filename
var link string
var err error
link, fi, err = evalSymlinks(fs, filename)
if err != nil {
return nil, err
}
filename = link
meta[metaKeyIsSymlink] = true
}
opener := func() (afero.File, error) {
return ffs.open(filename)
}
return decorateFileInfo(fi, ffs, opener, filename, "", meta), nil
}
ffs.decorate = decorator
return ffs
}
func evalSymlinks(fs afero.Fs, filename string) (string, os.FileInfo, error) {
link, err := filepath.EvalSymlinks(filename)
if err != nil {
return "", nil, err
}
fi, err := fs.Stat(link)
if err != nil {
return "", nil, err
}
return link, fi, nil
}
type baseFileDecoratorFs struct {
afero.Fs
decorate func(fi os.FileInfo, filename string) (os.FileInfo, error)
}
func (fs *baseFileDecoratorFs) Stat(name string) (os.FileInfo, error) {
fi, err := fs.Fs.Stat(name)
if err != nil {
return nil, err
}
return fs.decorate(fi, name)
}
func (fs *baseFileDecoratorFs) LstatIfPossible(name string) (os.FileInfo, bool, error) {
var (
fi os.FileInfo
err error
ok bool
)
if lstater, isLstater := fs.Fs.(afero.Lstater); isLstater {
fi, ok, err = lstater.LstatIfPossible(name)
} else {
fi, err = fs.Fs.Stat(name)
}
if err != nil {
return nil, false, err
}
fi, err = fs.decorate(fi, name)
return fi, ok, err
}
func (fs *baseFileDecoratorFs) Open(name string) (afero.File, error) {
return fs.open(name)
}
func (fs *baseFileDecoratorFs) open(name string) (afero.File, error) {
f, err := fs.Fs.Open(name)
if err != nil {
return nil, err
}
return &baseFileDecoratorFile{File: f, fs: fs}, nil
}
type baseFileDecoratorFile struct {
afero.File
fs *baseFileDecoratorFs
}
func (l *baseFileDecoratorFile) Readdir(c int) (ofi []os.FileInfo, err error) {
dirnames, err := l.File.Readdirnames(c)
if err != nil {
return nil, err
}
fisp := make([]os.FileInfo, 0, len(dirnames))
for _, dirname := range dirnames {
filename := dirname
if l.Name() != "" && l.Name() != filepathSeparator {
filename = filepath.Join(l.Name(), dirname)
}
// We need to resolve any symlink info.
fi, _, err := lstatIfPossible(l.fs.Fs, filename)
if err != nil {
if os.IsNotExist(err) {
continue
}
return nil, err
}
fi, err = l.fs.decorate(fi, filename)
if err != nil {
return nil, errors.Wrap(err, "decorate")
}
fisp = append(fisp, fi)
}
return fisp, err
}
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