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write.go
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write.go
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// Copyright 2014 Unknown
//
// 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 tz
import (
"archive/tar"
"compress/gzip"
"fmt"
"io"
"os"
"path"
"path/filepath"
"strings"
"github.com/unknwon/cae"
)
// Switcher of printing trace information when pack and extract.
var Verbose = true
// extractFile extracts zip.File to file system.
func extractFile(f *tar.Header, tr *tar.Reader, destPath string) error {
filePath := path.Join(destPath, f.Name)
os.MkdirAll(path.Dir(filePath), os.ModePerm)
fw, err := os.Create(filePath)
if err != nil {
return err
}
defer fw.Close()
if _, err = io.Copy(fw, tr); err != nil {
return err
}
// Skip symbolic links.
if f.FileInfo().Mode()&os.ModeSymlink != 0 {
return nil
}
// Set back file information.
if err = os.Chtimes(filePath, f.FileInfo().ModTime(), f.FileInfo().ModTime()); err != nil {
return err
}
return os.Chmod(filePath, f.FileInfo().Mode())
}
var defaultExtractFunc = func(fullName string, fi os.FileInfo) error {
if !Verbose {
return nil
}
fmt.Println("Extracting file..." + fullName)
return nil
}
// ExtractTo extracts the whole archive or the given files to the
// specified destination.
// It accepts a function as a middleware for custom operations.
func (tz *TzArchive) ExtractToFunc(destPath string, fn cae.HookFunc, entries ...string) (err error) {
destPath = strings.Replace(destPath, "\\", "/", -1)
isHasEntry := len(entries) > 0
if Verbose {
fmt.Println("Extracting " + tz.FileName + "...")
}
os.MkdirAll(destPath, os.ModePerm)
// Copy post-added files.
for _, f := range tz.files {
if !cae.IsExist(f.absPath) {
continue
}
relPath := path.Join(destPath, f.Name)
os.MkdirAll(path.Dir(relPath), os.ModePerm)
if err := cae.Copy(relPath, f.absPath); err != nil {
return err
}
}
tr, f, err := openFile(tz.FileName)
if err != nil {
return err
}
defer f.Close()
for {
h, err := tr.Next()
if err == io.EOF {
break
} else if err != nil {
return err
}
h.Name = strings.Replace(h.Name, "\\", "/", -1)
// Directory.
if h.Typeflag == tar.TypeDir {
if isHasEntry {
if cae.IsEntry(h.Name, entries) {
if err = fn(h.Name, h.FileInfo()); err != nil {
continue
}
os.MkdirAll(path.Join(destPath, h.Name), os.ModePerm)
}
continue
}
if err = fn(h.Name, h.FileInfo()); err != nil {
continue
}
os.MkdirAll(path.Join(destPath, h.Name), os.ModePerm)
continue
}
// File.
if isHasEntry {
if cae.IsEntry(h.Name, entries) {
if err = fn(h.Name, h.FileInfo()); err != nil {
continue
}
err = extractFile(h, tr, destPath)
}
} else {
if err = fn(h.Name, h.FileInfo()); err != nil {
continue
}
err = extractFile(h, tr, destPath)
}
if err != nil {
return err
}
}
return nil
}
// ExtractTo extracts the whole archive or the given files to the
// specified destination.
// Call Flush() to apply changes before this.
func (tz *TzArchive) ExtractTo(destPath string, entries ...string) (err error) {
return tz.ExtractToFunc(destPath, defaultExtractFunc, entries...)
}
// ExtractTo extracts given archive or the given files to the
// specified destination.
func ExtractTo(srcPath, destPath string, entries ...string) (err error) {
tz, err := Open(srcPath)
if err != nil {
return err
}
defer tz.Close()
return tz.ExtractToFunc(destPath, defaultExtractFunc, entries...)
}
// extractFile extracts file from TzArchive to file system.
func (tz *TzArchive) extractFile(f *File, tr *tar.Reader) error {
if !tz.isHasWriter {
for _, h := range tz.ReadCloser.File {
if f.Name == h.Name {
return extractFile(h, tr, f.absPath)
}
}
}
return cae.Copy(f.Name, f.absPath)
}
// Flush saves changes to original zip file if any.
func (tz *TzArchive) Flush() (err error) {
if !tz.isHasChanged || (tz.ReadCloser == nil && !tz.isHasWriter) {
return nil
}
// Extract to tmp path and pack back.
tmpPath := path.Join(os.TempDir(), "cae", path.Base(tz.FileName))
os.RemoveAll(tmpPath)
os.MkdirAll(tmpPath, os.ModePerm)
defer os.RemoveAll(tmpPath)
// Copy post-added files.
for _, f := range tz.files {
if strings.HasSuffix(f.Name, "/") {
os.MkdirAll(path.Join(tmpPath, f.Name), os.ModePerm)
continue
} else if !cae.IsExist(f.absPath) {
continue
}
relPath := path.Join(tmpPath, f.Name)
os.MkdirAll(path.Dir(relPath), os.ModePerm)
if err := cae.Copy(relPath, f.absPath); err != nil {
return err
}
}
if !tz.isHasWriter {
tz.ReadCloser, err = openReader(tz.FileName)
if err != nil {
return err
}
tz.syncFiles()
tr, f, err := openFile(tz.FileName)
if err != nil {
return err
}
defer f.Close()
i := 0
for {
h, err := tr.Next()
if err == io.EOF {
break
} else if err != nil {
return err
}
if h.Typeflag == tar.TypeDir {
os.MkdirAll(path.Join(tmpPath, h.Name), os.ModePerm)
continue
}
// Relative path inside zip temporary changed.
fileName := tz.files[i].Name
tz.files[i].Name = path.Join(tmpPath, fileName)
if err := tz.extractFile(tz.files[i], tr); err != nil {
return err
}
// Change back here.
tz.files[i].Name = fileName
i++
}
}
if tz.isHasWriter {
return packToWriter(tmpPath, tz.writer, defaultPackFunc, true)
}
if err := PackTo(tmpPath, tz.FileName); err != nil {
return err
}
return tz.Open(tz.FileName, os.O_RDWR|os.O_TRUNC, tz.Permission)
}
// packFile packs a file or directory to tar.Writer.
func packFile(srcFile string, recPath string, tw *tar.Writer, fi os.FileInfo) (err error) {
if fi.IsDir() {
h, err := tar.FileInfoHeader(fi, "")
if err != nil {
return err
}
h.Name = recPath + "/"
if err = tw.WriteHeader(h); err != nil {
return err
}
} else {
target := ""
if fi.Mode()&os.ModeSymlink != 0 {
target, err = os.Readlink(srcFile)
if err != nil {
return err
}
}
h, err := tar.FileInfoHeader(fi, target)
if err != nil {
return err
}
h.Name = recPath
if err = tw.WriteHeader(h); err != nil {
return err
}
if len(target) == 0 {
f, err := os.Open(srcFile)
if err != nil {
return err
}
if _, err = io.Copy(tw, f); err != nil {
return err
}
}
}
return nil
}
// packDir packs a directory and its subdirectories and files
// recursively to zip.Writer.
func packDir(srcPath string, recPath string, tw *tar.Writer, fn cae.HookFunc) error {
dir, err := os.Open(srcPath)
if err != nil {
return err
}
defer dir.Close()
// Get file info slice
fis, err := dir.Readdir(0)
if err != nil {
return err
}
for _, fi := range fis {
if cae.IsFilter(fi.Name()) {
continue
}
// Append path
curPath := srcPath + "/" + fi.Name()
tmpRecPath := filepath.Join(recPath, fi.Name())
if err = fn(curPath, fi); err != nil {
continue
}
// Check it is directory or file
if fi.IsDir() {
if err = packFile(srcPath, tmpRecPath, tw, fi); err != nil {
return err
}
err = packDir(curPath, tmpRecPath, tw, fn)
} else {
err = packFile(curPath, tmpRecPath, tw, fi)
}
if err != nil {
return err
}
}
return nil
}
// packToWriter packs given path object to io.Writer.
func packToWriter(srcPath string, w io.Writer, fn func(fullName string, fi os.FileInfo) error, includeDir bool) error {
gw := gzip.NewWriter(w)
defer gw.Close()
tw := tar.NewWriter(gw)
defer tw.Close()
f, err := os.Open(srcPath)
if err != nil {
return err
}
fi, err := f.Stat()
if err != nil {
return err
}
basePath := path.Base(srcPath)
if fi.IsDir() {
if includeDir {
if err = packFile(srcPath, basePath, tw, fi); err != nil {
return err
}
} else {
basePath = ""
}
return packDir(srcPath, basePath, tw, fn)
}
return packFile(srcPath, basePath, tw, fi)
}
// packTo packs given source path object to target path.
func packTo(srcPath, destPath string, fn cae.HookFunc, includeDir bool) error {
fw, err := os.Create(destPath)
if err != nil {
return err
}
defer fw.Close()
return packToWriter(srcPath, fw, fn, includeDir)
}
// PackToFunc packs the complete archive to the specified destination.
// It accepts a function as a middleware for custom operations.
func PackToFunc(srcPath, destPath string, fn func(fullName string, fi os.FileInfo) error, includeDir ...bool) error {
isIncludeDir := false
if len(includeDir) > 0 && includeDir[0] {
isIncludeDir = true
}
return packTo(srcPath, destPath, fn, isIncludeDir)
}
var defaultPackFunc = func(fullName string, fi os.FileInfo) error {
if !Verbose {
return nil
}
if fi.IsDir() {
fmt.Printf("Adding dir...%s\n", fullName)
} else {
fmt.Printf("Adding file...%s\n", fullName)
}
return nil
}
// PackTo packs the whole archive to the specified destination.
// Call Flush() will automatically call this in the end.
func PackTo(srcPath, destPath string, includeDir ...bool) error {
return PackToFunc(srcPath, destPath, defaultPackFunc, includeDir...)
}
// Close opens or creates archive and save changes.
func (z *TzArchive) Close() (err error) {
if err = z.Flush(); err != nil {
return err
}
if z.ReadCloser != nil {
if err = z.ReadCloser.Close(); err != nil {
return err
}
z.ReadCloser = nil
}
return nil
}