func createBundle(name, outdir, contentdir, root string) (string, error) {
archive, err := os.Create(filepath.Join(outdir, name))
if err != nil {
return "", errors.Annotate(err, "error opening archive file")
}
defer archive.Close()
// Build the tarball, writing out to both the archive file and a
// SHA1 hash. The hash will correspond to the gzipped file rather
// than to the uncompressed contents of the tarball. This is so
// that users can compare the published checksum against the
// checksum of the file without having to decompress it first.
hasher := hash.NewHashingWriter(archive, sha1.New())
err = func() error {
tarball := gzip.NewWriter(hasher)
defer tarball.Close()
_, err := tar.TarFiles([]string{contentdir}, tarball, root)
return err
}()
if err != nil {
return "", errors.Annotate(err, "error bundling final archive")
}
// Return the SHA1 checksum.
// Gzip writers may buffer what they're writing so we must call
// Close() on the writer *before* getting the checksum from the
// hasher.
return hasher.Base64Sum(), nil
}
func (b *builder) buildArchive(outFile io.Writer) error {
tarball := gzip.NewWriter(outFile)
defer tarball.Close()
// We add a trailing slash (or whatever) to root so that everything
// in the path up to and including that slash is stripped off when
// each file is added to the tar file.
stripPrefix := b.archive.UnpackedRootDir + string(os.PathSeparator)
filenames := []string{b.archive.ContentDir()}
if _, err := tar.TarFiles(filenames, tarball, stripPrefix); err != nil {
return errors.Annotate(err, "while bundling final archive")
}
return nil
}
func (b *builder) buildFilesBundle() error {
logger.Infof("dumping juju state-related files")
if len(b.filesToBackUp) == 0 {
return errors.New("missing list of files to back up")
}
if b.bundleFile == nil {
return errors.New("missing bundleFile")
}
stripPrefix := string(os.PathSeparator)
_, err := tar.TarFiles(b.filesToBackUp, b.bundleFile, stripPrefix)
if err != nil {
return errors.Annotate(err, "while bundling state-critical files")
}
return nil
}
func dumpFiles(dumpdir string) error {
tarFile, err := os.Create(filepath.Join(dumpdir, "root.tar"))
if err != nil {
return errors.Annotate(err, "error while opening initial archive")
}
defer tarFile.Close()
backupFiles, err := getFilesToBackup("")
if err != nil {
return errors.Annotate(err, "cannot determine files to backup")
}
sep := string(os.PathSeparator)
_, err = tar.TarFiles(backupFiles, tarFile, sep)
if err != nil {
return errors.Annotate(err, "cannot backup configuration files")
}
return nil
}