/
uzip.go
195 lines (165 loc) · 3.81 KB
/
uzip.go
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// Copyright 2018 the u-root Authors. All rights reserved
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// Package uzip contains utilities for file system->zip and zip->file system conversions.
package uzip
import (
"archive/zip"
"fmt"
"io"
"log"
"os"
"path/filepath"
"github.com/u-root/u-root/pkg/upath"
)
// ToZip packs the all files at dir to a zip archive at dest.
func ToZip(dir, dest, comment string) (reterr error) {
if info, err := os.Stat(dir); err != nil {
return err
} else if !info.IsDir() {
return fmt.Errorf("%s is not a directory", dir)
}
archive, err := os.Create(dest)
if err != nil {
return err
}
defer func() {
if err := archive.Close(); err != nil && reterr == nil {
reterr = err
}
}()
z := zip.NewWriter(archive)
defer func() {
if comment != "" {
z.SetComment(comment)
}
if err := z.Close(); err != nil && reterr == nil {
reterr = err
}
}()
return writeDir(dir, z)
}
// AppendZip packs the all files at dir to a zip archive at dest.
func AppendZip(dir, dest, comment string) (reterr error) {
if info, err := os.Stat(dir); err != nil {
return err
} else if !info.IsDir() {
return fmt.Errorf("%s is not a directory", dir)
}
archive, err := os.OpenFile(dest, os.O_RDWR, 0)
if err != nil {
return err
}
defer func() {
if err := archive.Close(); err != nil && reterr == nil {
reterr = err
}
}()
// Go to the end of the file because we are appending.
end, err := archive.Seek(0, os.SEEK_END)
if err != nil {
return err
}
z := zip.NewWriter(archive)
z.SetOffset(end)
defer func() {
if comment != "" {
z.SetComment(comment)
}
if err := z.Close(); err != nil && reterr == nil {
reterr = err
}
}()
return writeDir(dir, z)
}
func writeDir(dir string, z *zip.Writer) error {
return filepath.Walk(dir, func(path string, info os.FileInfo, err error) error {
if err != nil {
return err
}
// do not include srcDir into archive
if info.Name() == filepath.Base(dir) {
return nil
}
header, err := zip.FileInfoHeader(info)
if err != nil {
return err
}
// adjust header.Name to preserve folder structure
header.Name, err = filepath.Rel(dir, path)
if err != nil {
return err
}
if info.IsDir() {
header.Name += "/"
} else {
header.Method = zip.Deflate
}
writer, err := z.CreateHeader(header)
if err != nil {
return err
}
if info.IsDir() {
return nil
}
file, err := os.Open(path)
if err != nil {
return err
}
defer file.Close()
_, err = io.Copy(writer, file)
return err
})
}
// Comment returns the comment from the zip file.
func Comment(file string) (string, error) {
z, err := zip.OpenReader(file)
if err != nil {
return "", err
}
defer z.Close()
return z.Comment, nil
}
// FromZip extracts the zip archive at src to dir.
func FromZip(src, dir string) error {
z, err := zip.OpenReader(src)
if err != nil {
return err
}
if err = os.MkdirAll(dir, 0o755); err != nil {
return err
}
for _, file := range z.File {
path, err := upath.SafeFilepathJoin(dir, file.Name)
if err != nil {
// The behavior is to skip files which are unsafe due to
// zipslip, but continue extracting everything else.
log.Printf("Warning: Skipping file %q due to: %v", file.Name, err)
continue
}
if file.FileInfo().IsDir() {
if err = os.MkdirAll(path, file.Mode()); err != nil {
return err
}
continue
}
fileReader, err := file.Open()
if err != nil {
return err
}
targetFile, err := os.OpenFile(path, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, file.Mode())
if err != nil {
return err
}
if _, err := io.Copy(targetFile, fileReader); err != nil {
return err
}
if err = fileReader.Close(); err != nil {
return err
}
if err = targetFile.Close(); err != nil {
return err
}
}
return nil
}