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|
package archives
import (
"archive/zip"
"io"
"io/ioutil"
"os"
"path/filepath"
"github.com/sirupsen/logrus"
)
func extractZipDirectoryEntry(file *zip.File) (err error) {
err = os.Mkdir(file.Name, file.Mode().Perm())
// The error that directory does exists is not a error for us
if os.IsExist(err) {
err = nil
}
return
}
func extractZipSymlinkEntry(file *zip.File) (err error) {
var data []byte
in, err := file.Open()
if err != nil {
return err
}
defer func() { _ = in.Close() }()
data, err = ioutil.ReadAll(in)
if err != nil {
return err
}
// Remove symlink before creating a new one, otherwise we can error that file does exist
_ = os.Remove(file.Name)
err = os.Symlink(string(data), file.Name)
return
}
func extractZipFileEntry(file *zip.File) (err error) {
var out *os.File
in, err := file.Open()
if err != nil {
return err
}
defer func() { _ = in.Close() }()
// Remove file before creating a new one, otherwise we can error that file does exist
_ = os.Remove(file.Name)
out, err = os.OpenFile(file.Name, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, file.Mode().Perm())
if err != nil {
return err
}
defer func() { _ = out.Close() }()
_, err = io.Copy(out, in)
return
}
func extractZipFile(file *zip.File) (err error) {
// Create all parents to extract the file
err = os.MkdirAll(filepath.Dir(file.Name), 0777)
if err != nil {
return err
}
switch file.Mode() & os.ModeType {
case os.ModeDir:
err = extractZipDirectoryEntry(file)
case os.ModeSymlink:
err = extractZipSymlinkEntry(file)
case os.ModeNamedPipe, os.ModeSocket, os.ModeDevice:
// Ignore the files that of these types
logrus.Warningf("File ignored: %q", file.Name)
default:
err = extractZipFileEntry(file)
}
return
}
func ExtractZipArchive(archive *zip.Reader) error {
tracker := newPathErrorTracker()
for _, file := range archive.File {
if err := errorIfGitDirectory(file.Name); tracker.actionable(err) {
printGitArchiveWarning("extract")
}
if err := extractZipFile(file); tracker.actionable(err) {
logrus.Warningf("%s: %s (suppressing repeats)", file.Name, err)
}
}
for _, file := range archive.File {
// Update file permissions
if err := os.Chmod(file.Name, file.Mode().Perm()); tracker.actionable(err) {
logrus.Warningf("%s: %s (suppressing repeats)", file.Name, err)
}
// Process zip metadata
if err := processZipExtra(&file.FileHeader); tracker.actionable(err) {
logrus.Warningf("%s: %s (suppressing repeats)", file.Name, err)
}
}
return nil
}
func ExtractZipFile(fileName string) error {
archive, err := zip.OpenReader(fileName)
if err != nil {
return err
}
defer func() { _ = archive.Close() }()
return ExtractZipArchive(&archive.Reader)
}
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