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package getter
import (
"archive/zip"
"fmt"
"io"
"os"
"path/filepath"
)
// ZipDecompressor is an implementation of Decompressor that can
// decompress tar.gzip files.
type ZipDecompressor struct{}
func (d *ZipDecompressor) Decompress(dst, src string, dir bool) error {
// If we're going into a directory we should make that first
mkdir := dst
if !dir {
mkdir = filepath.Dir(dst)
}
if err := os.MkdirAll(mkdir, 0755); err != nil {
return err
}
// Open the zip
zipR, err := zip.OpenReader(src)
if err != nil {
return err
}
defer zipR.Close()
// Check the zip integrity
if len(zipR.File) == 0 {
// Empty archive
return fmt.Errorf("empty archive: %s", src)
}
if !dir && len(zipR.File) > 1 {
return fmt.Errorf("expected a single file: %s", src)
}
// Go through and unarchive
for _, f := range zipR.File {
path := dst
if dir {
path = filepath.Join(path, f.Name)
}
if f.FileInfo().IsDir() {
if !dir {
return fmt.Errorf("expected a single file: %s", src)
}
// A directory, just make the directory and continue unarchiving...
if err := os.MkdirAll(path, 0755); err != nil {
return err
}
continue
}
// Create the enclosing directories if we must. ZIP files aren't
// required to contain entries for just the directories so this
// can happen.
if dir {
if err := os.MkdirAll(filepath.Dir(path), 0755); err != nil {
return err
}
}
// Open the file for reading
srcF, err := f.Open()
if err != nil {
return err
}
// Open the file for writing
dstF, err := os.Create(path)
if err != nil {
srcF.Close()
return err
}
_, err = io.Copy(dstF, srcF)
srcF.Close()
dstF.Close()
if err != nil {
return err
}
// Chmod the file
if err := os.Chmod(path, f.Mode()); err != nil {
return err
}
}
return nil
}
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