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file.go
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file.go
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package util
import (
"archive/tar"
"bytes"
"compress/gzip"
"io"
"strings"
"github.com/pkg/errors"
)
func FilesToTGZ(files map[string]string) ([]byte, error) {
var buf bytes.Buffer
gw := gzip.NewWriter(&buf)
tw := tar.NewWriter(gw)
for path, content := range files {
header := &tar.Header{
Name: path,
Mode: 0644,
Size: int64(len(content)),
}
if err := tw.WriteHeader(header); err != nil {
return nil, errors.Wrapf(err, "failed to write tar header for %s", path)
}
_, err := io.Copy(tw, strings.NewReader(content))
if err != nil {
return nil, errors.Wrapf(err, "failed to write %s to tar", path)
}
}
if err := tw.Close(); err != nil {
return nil, errors.Wrap(err, "failed to close tar writer")
}
if err := gw.Close(); err != nil {
return nil, errors.Wrap(err, "failed to close gzip writer")
}
return buf.Bytes(), nil
}
func TGZToFiles(tgzBytes []byte) (map[string]string, error) {
files := make(map[string]string)
gr, err := gzip.NewReader(bytes.NewReader(tgzBytes))
if err != nil {
return nil, errors.Wrap(err, "failed to create gzip reader")
}
defer gr.Close()
tr := tar.NewReader(gr)
for {
header, err := tr.Next()
if err == io.EOF {
break
}
if err != nil {
return nil, err
}
if header.Typeflag == tar.TypeReg {
var contentBuf bytes.Buffer
if _, err := io.Copy(&contentBuf, tr); err != nil {
return nil, errors.Wrap(err, "failed to copy tar data")
}
files[header.Name] = contentBuf.String()
}
}
return files, nil
}