100 lines
1.9 KiB
Go
100 lines
1.9 KiB
Go
package getter
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import (
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"archive/tar"
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"compress/gzip"
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"fmt"
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"io"
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"os"
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"path/filepath"
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)
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// TarGzipDecompressor is an implementation of Decompressor that can
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// decompress tar.gzip files.
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type TarGzipDecompressor struct{}
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func (d *TarGzipDecompressor) Decompress(dst, src string, dir bool) error {
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// If we're going into a directory we should make that first
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mkdir := dst
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if !dir {
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mkdir = filepath.Dir(dst)
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}
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if err := os.MkdirAll(mkdir, 0755); err != nil {
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return err
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}
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// File first
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f, err := os.Open(src)
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if err != nil {
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return err
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}
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defer f.Close()
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// Gzip compression is second
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gzipR, err := gzip.NewReader(f)
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if err != nil {
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return fmt.Errorf("Error opening a gzip reader for %s: %s", src, err)
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}
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defer gzipR.Close()
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// Once gzip decompressed we have a tar format
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tarR := tar.NewReader(gzipR)
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done := false
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for {
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hdr, err := tarR.Next()
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if err == io.EOF {
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if !done {
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// Empty archive
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return fmt.Errorf("empty archive: %s", src)
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}
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return nil
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}
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if err != nil {
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return err
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}
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path := dst
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if dir {
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path = filepath.Join(path, hdr.Name)
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}
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if hdr.FileInfo().IsDir() {
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if !dir {
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return fmt.Errorf("expected a single file: %s", src)
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}
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// A directory, just make the directory and continue unarchiving...
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if err := os.MkdirAll(path, 0755); err != nil {
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return err
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}
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continue
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}
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// We have a file. If we already decoded, then it is an error
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if !dir && done {
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return fmt.Errorf("expected a single file, got multiple: %s", src)
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}
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// Mark that we're done so future in single file mode errors
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done = true
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// Open the file for writing
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dstF, err := os.Create(path)
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if err != nil {
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return err
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}
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_, err = io.Copy(dstF, tarR)
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dstF.Close()
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if err != nil {
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return err
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}
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// Chmod the file
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if err := os.Chmod(path, hdr.FileInfo().Mode()); err != nil {
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return err
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}
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}
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}
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