//Gets next tar header for supported types
func (drdr *DebReader) NextTar() (string, *tar.Reader, error) {
for {
hdr, err := drdr.ArReader.Next()
if err != nil {
return "", nil, err
}
if hdr.Name == "debian-binary" {
drdr.HasDebianVersion = true
continue
}
if strings.HasSuffix(hdr.Name, ".tar.gz") {
tgzr, err := targz.NewReader(drdr.ArReader)
return hdr.Name, tgzr.Reader, err
}
// else return error
return hdr.Name, nil, fmt.Errorf("Unsuported file type: %s", hdr.Name)
}
}
func DebExtractFileL2(rdr io.Reader, topLevelFilename string, secondLevelFilename string, destination io.Writer) error {
arr, err := ar.NewReader(rdr)
if err != nil {
return err
}
for {
hdr, err := arr.Next()
if err == io.EOF {
// end of ar archive
break
}
if err != nil {
return err
}
if hdr.Name == topLevelFilename {
tgzr, err := targz.NewReader(arr)
if err != nil {
tgzr.Close()
return err
}
for {
thdr, err := tgzr.Next()
if err == io.EOF {
// end of tar.gz archive
break
}
if err != nil {
tgzr.Close()
return err
}
if thdr.Name == secondLevelFilename {
_, err = io.Copy(destination, tgzr)
tgzr.Close()
return nil
} else {
//SKIP
log.Printf("File %s", thdr.Name)
}
}
tgzr.Close()
}
}
return fmt.Errorf("File not found")
}
func DebGetContents(rdr io.Reader, topLevelFilename string) ([]string, error) {
ret := []string{}
fileNotFound := true
arr, err := ar.NewReader(rdr)
if err != nil {
return nil, err
}
for {
hdr, err := arr.Next()
if err == io.EOF {
// end of ar archive
break
}
if err != nil {
return nil, err
}
if hdr.Name == topLevelFilename {
fileNotFound = false
tgzr, err := targz.NewReader(arr)
if err != nil {
tgzr.Close()
return nil, err
}
for {
thdr, err := tgzr.Next()
if err == io.EOF {
// end of tar.gz archive
break
}
if err != nil {
tgzr.Close()
return nil, err
}
ret = append(ret, thdr.Name)
}
}
}
if fileNotFound {
return nil, fmt.Errorf("File not found")
}
return ret, nil
}
// ParseDebMetadata reads an artifact's contents.
func DebParseMetadata(rdr io.Reader) (*Package, error) {
arr, err := ar.NewReader(rdr)
if err != nil {
return nil, err
}
var pkg *Package
pkg = nil
hasDataArchive := false
hasControlArchive := false
hasControlFile := false
hasDebianBinaryFile := false
// Iterate through the files in the archive.
for {
hdr, err := arr.Next()
if err == io.EOF {
// end of ar archive
break
}
if err != nil {
return nil, err
}
// t.Logf("File %s:\n", hdr.Name)
if hdr.Name == BinaryDataArchiveNameDefault {
// SKIP!
hasDataArchive = true
} else if hdr.Name == BinaryControlArchiveNameDefault {
// Find control file
hasControlArchive = true
tgzr, err := targz.NewReader(arr)
if err != nil {
return nil, err
}
for {
thdr, err := tgzr.Next()
if err == io.EOF {
// end of tar.gz archive
break
}
if err != nil {
return nil, err
}
if path.Base(thdr.Name) == "control" {
hasControlFile = true
dscr := NewDscReader(tgzr)
pkg, err = dscr.Parse()
if err != nil {
return nil, err
}
} else {
//SKIP
log.Printf("File %s", thdr.Name)
}
}
} else if hdr.Name == "debian-binary" {
b, err := ioutil.ReadAll(arr)
if err != nil {
return nil, err
}
hasDebianBinaryFile = true
if string(b) != "2.0\n" {
return nil, fmt.Errorf("Binary version not valid: %s", string(b))
}
} else {
return nil, fmt.Errorf("Unsupported file %s", hdr.Name)
}
}
if !hasDebianBinaryFile {
return nil, fmt.Errorf("No debian-binary file in .deb archive")
}
if !hasDataArchive {
return nil, fmt.Errorf("No data.tar.gz file in .deb archive")
}
if !hasControlArchive {
return nil, fmt.Errorf("No control.tar.gz file in .deb archive")
}
if !hasControlFile {
return nil, fmt.Errorf("No debian/control file in control.tar.gz")
}
return pkg, nil
}
func Example() {
// Create a buffer to write our archive to.
wtr := writer(isFs)
// Create a new ar archive.
tgzw := targz.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 := &tar.Header{
Name: file.Name,
Size: int64(len(file.Body)),
}
if err := tgzw.WriteHeader(hdr); err != nil {
log.Fatalln(err)
}
if _, err := tgzw.Write([]byte(file.Body)); err != nil {
log.Fatalln(err)
}
}
// Make sure to check the error on Close.
if err := tgzw.Close(); err != nil {
log.Fatalln(err)
}
rdr := reader(isFs, wtr)
tgzr, err := targz.NewReader(rdr)
if err != nil {
log.Fatalln(err)
}
// Iterate through the files in the archive.
for {
hdr, err := tgzr.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, tgzr); 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.
}