func (bdeb *DebWriter) Build(tempDir, destDir string) error {
wtr, err := os.Create(filepath.Join(destDir, bdeb.Filename))
if err != nil {
return err
}
defer wtr.Close()
aw := ar.NewWriter(wtr)
err = bdeb.writeBytes(aw, "debian-binary", []byte(bdeb.DebianBinaryVersion+"\n"))
if err != nil {
return fmt.Errorf("Error writing debian-binary into .ar archive: %v", err)
}
err = bdeb.writeFromFile(aw, filepath.Join(tempDir, bdeb.ControlArchive))
if err != nil {
return fmt.Errorf("Error writing control archive into .ar archive: %v", err)
}
err = bdeb.writeFromFile(aw, filepath.Join(tempDir, bdeb.DataArchive))
if err != nil {
return fmt.Errorf("Error writing data archive into .ar archive: %v", err)
}
err = aw.Close()
if err != nil {
return fmt.Errorf("Error closing .ar archive: %v", err)
}
return nil
}
func Example() {
// Create a buffer to write our archive to.
wtr := new(bytes.Buffer)
// Create a new ar archive.
aw := ar.NewWriter(wtr)
// Add some files to the archive.
var files = []struct {
Name, Body string
}{
{"readme.txt", "This archive contains some text files."},
{"gopher.txt", "Gopher names:\nGeorge\nGeoffrey\nGonzo"},
{"todo.txt", "Get animal handling licence."},
}
for _, file := range files {
hdr := &ar.Header{
Name: file.Name,
Size: int64(len(file.Body)),
}
if err := aw.WriteHeader(hdr); err != nil {
log.Fatalln(err)
}
if _, err := aw.Write([]byte(file.Body)); err != nil {
log.Fatalln(err)
}
}
// Make sure to check the error on Close.
if err := aw.Close(); err != nil {
log.Fatalln(err)
}
// Open the ar archive for reading.
rdr := bytes.NewReader(wtr.Bytes())
arr, err := ar.NewReader(rdr)
if err != nil {
log.Fatalln(err)
}
// Iterate through the files in the archive.
for {
hdr, err := arr.Next()
if err == io.EOF {
// end of ar archive
break
}
if err != nil {
log.Fatalln(err)
}
fmt.Printf("Contents of %s:\n", hdr.Name)
if _, err := io.Copy(os.Stdout, arr); err != nil {
log.Fatalln(err)
}
fmt.Println()
}
// Output:
// Contents of readme.txt:
// This archive contains some text files.
// Contents of gopher.txt:
// Gopher names:
// George
// Geoffrey
// Gonzo
// Contents of todo.txt:
// Get animal handling licence.
}