forked from mholt/archiver
/
zip.go
219 lines (187 loc) · 4.79 KB
/
zip.go
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// Package archiver makes it super easy to create and open .zip,
// .tar.gz, and .tar.bz2 files.
package archiver
import (
"archive/zip"
"fmt"
"io"
"os"
"path"
"path/filepath"
"runtime"
"strings"
)
// Zip creates a .zip file in the location zipPath containing
// the contents of files listed in filePaths. File paths
// can be those of regular files or directories. Regular
// files are stored at the 'root' of the archive, and
// directories are recursively added.
//
// Files with an extension for formats that are already
// compressed will be stored only, not compressed.
func Zip(zipPath string, filePaths []string) error {
out, err := os.Create(zipPath)
if err != nil {
return fmt.Errorf("error creating %s: %v", zipPath, err)
}
defer out.Close()
w := zip.NewWriter(out)
for _, fpath := range filePaths {
err = zipFile(w, fpath)
if err != nil {
w.Close()
return err
}
}
return w.Close()
}
func zipFile(w *zip.Writer, source string) error {
sourceInfo, err := os.Stat(source)
if err != nil {
return fmt.Errorf("%s: stat: %v", source, err)
}
var baseDir string
if sourceInfo.IsDir() {
baseDir = filepath.Base(source)
}
return filepath.Walk(source, func(fpath string, info os.FileInfo, err error) error {
if err != nil {
return fmt.Errorf("walking to %s: %v", fpath, err)
}
header, err := zip.FileInfoHeader(info)
if err != nil {
return fmt.Errorf("%s: getting header: %v", fpath, err)
}
if baseDir != "" {
header.Name = path.Join(baseDir, strings.TrimPrefix(fpath, source))
}
if info.IsDir() {
header.Name += "/"
header.Method = zip.Store
} else {
ext := strings.ToLower(path.Ext(header.Name))
if _, ok := CompressedFormats[ext]; ok {
header.Method = zip.Store
} else {
header.Method = zip.Deflate
}
}
writer, err := w.CreateHeader(header)
if err != nil {
return fmt.Errorf("%s: making header: %v", fpath, err)
}
if info.IsDir() {
return nil
}
if header.Mode().IsRegular() {
file, err := os.Open(fpath)
if err != nil {
return fmt.Errorf("%s: opening: %v", fpath, err)
}
defer file.Close()
_, err = io.CopyN(writer, file, info.Size())
if err != nil && err != io.EOF {
return fmt.Errorf("%s: copying contents: %v", fpath, err)
}
}
return nil
})
}
// Unzip unzips the .zip file at source into destination.
func Unzip(source, destination string) error {
r, err := zip.OpenReader(source)
if err != nil {
return err
}
defer r.Close()
for _, zf := range r.File {
if err := unzipFile(zf, destination); err != nil {
return err
}
}
return nil
}
func unzipFile(zf *zip.File, destination string) error {
if strings.HasSuffix(zf.Name, "/") {
return mkdir(filepath.Join(destination, zf.Name))
}
rc, err := zf.Open()
if err != nil {
return fmt.Errorf("%s: open compressed file: %v", zf.Name, err)
}
defer rc.Close()
return writeNewFile(filepath.Join(destination, zf.Name), rc, zf.FileInfo().Mode())
}
func writeNewFile(fpath string, in io.Reader, fm os.FileMode) error {
err := os.MkdirAll(filepath.Dir(fpath), 0755)
if err != nil {
return fmt.Errorf("%s: making directory for file: %v", fpath, err)
}
out, err := os.Create(fpath)
if err != nil {
return fmt.Errorf("%s: creating new file: %v", fpath, err)
}
defer out.Close()
err = out.Chmod(fm)
if err != nil && runtime.GOOS != "windows" {
return fmt.Errorf("%s: changing file mode: %v", fpath, err)
}
_, err = io.Copy(out, in)
if err != nil {
return fmt.Errorf("%s: writing file: %v", fpath, err)
}
return nil
}
func writeNewSymbolicLink(fpath string, target string) error {
err := os.MkdirAll(filepath.Dir(fpath), 0755)
if err != nil {
return fmt.Errorf("%s: making directory for file: %v", fpath, err)
}
err = os.Symlink(target, fpath)
if err != nil {
return fmt.Errorf("%s: making symbolic link for: %v", fpath, err)
}
return nil
}
func mkdir(dirPath string) error {
err := os.MkdirAll(dirPath, 0755)
if err != nil {
return fmt.Errorf("%s: making directory: %v", dirPath, err)
}
return nil
}
// CompressedFormats is a (non-exhaustive) set of lowercased
// file extensions for formats that are typically already
// compressed. Compressing already-compressed files often
// results in a larger file, so when possible, we check this
// set to avoid that.
var CompressedFormats = map[string]struct{}{
".7z": {},
".avi": {},
".bz2": {},
".cab": {},
".gif": {},
".gz": {},
".jar": {},
".jpeg": {},
".jpg": {},
".lz": {},
".lzma": {},
".mov": {},
".mp3": {},
".mp4": {},
".mpeg": {},
".mpg": {},
".png": {},
".rar": {},
".tgz": {},
".xz": {},
".zip": {},
".zipx": {},
}
type (
// CompressFunc is a function that makes an archive.
CompressFunc func(string, []string) error
// DecompressFunc is a function that extracts an archive.
DecompressFunc func(string, string) error
)