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package compression
import (
"archive/zip"
"errors"
"io"
"github.com/sirupsen/logrus"
)
type zipDecompressor struct {
genericDecompressor
zipReader *zip.ReadCloser
fileReader io.ReadCloser
}
func newZipDecompressor(compressedFilePath string) (*zipDecompressor, error) {
d, err := newGenericDecompressor(compressedFilePath)
return &zipDecompressor{*d, nil, nil}, err
}
// This is the only compressor that doesn't return the compressed file
// stream (zip.OpenReader() provides access to the decompressed file).
// As a result the progress bar shows the decompressed file stream
// but the final size is the compressed file size.
func (d *zipDecompressor) compressedFileReader() (io.ReadCloser, error) {
zipReader, err := zip.OpenReader(d.compressedFilePath)
if err != nil {
return nil, err
}
d.zipReader = zipReader
if len(zipReader.File) != 1 {
return nil, errors.New("machine image files should consist of a single compressed file")
}
z, err := zipReader.File[0].Open()
if err != nil {
return nil, err
}
d.fileReader = z
return z, nil
}
func (*zipDecompressor) decompress(w io.WriteSeeker, r io.Reader) error {
_, err := io.Copy(w, r)
return err
}
func (d *zipDecompressor) close() {
if err := d.zipReader.Close(); err != nil {
logrus.Errorf("Unable to close zip file: %q", err)
}
if err := d.fileReader.Close(); err != nil {
logrus.Errorf("Unable to close zip file: %q", err)
}
}
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