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package getter
import (
"archive/tar"
"compress/gzip"
"fmt"
"io"
"os"
"path/filepath"
)
// TarGzipDecompressor is an implementation of Decompressor that can
// decompress tar.gzip files.
type TarGzipDecompressor struct{}
func (d *TarGzipDecompressor) 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
}
// File first
f, err := os.Open(src)
if err != nil {
return err
}
defer f.Close()
// Gzip compression is second
gzipR, err := gzip.NewReader(f)
if err != nil {
return fmt.Errorf("Error opening a gzip reader for %s: %s", src, err)
}
defer gzipR.Close()
// Once gzip decompressed we have a tar format
tarR := tar.NewReader(gzipR)
done := false
for {
hdr, err := tarR.Next()
if err == io.EOF {
if !done {
// Empty archive
return fmt.Errorf("empty archive: %s", src)
}
return nil
}
if err != nil {
return err
}
path := dst
if dir {
path = filepath.Join(path, hdr.Name)
}
if hdr.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
}
// We have a file. If we already decoded, then it is an error
if !dir && done {
return fmt.Errorf("expected a single file, got multiple: %s", src)
}
// Mark that we're done so future in single file mode errors
done = true
// Open the file for writing
dstF, err := os.Create(path)
if err != nil {
return err
}
_, err = io.Copy(dstF, tarR)
dstF.Close()
if err != nil {
return err
}
// Chmod the file
if err := os.Chmod(path, hdr.FileInfo().Mode()); err != nil {
return err
}
}
}
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