func (s *archiveSuite) TestNewCanonoicalArchivePaths(c *gc.C) {
ap := backups.NewCanonicalArchivePaths()
c.Check(ap.ContentDir, gc.Equals, "juju-backup")
c.Check(ap.FilesBundle, gc.Equals, "juju-backup/root.tar")
c.Check(ap.DBDumpDir, gc.Equals, "juju-backup/dump")
c.Check(ap.MetadataFile, gc.Equals, "juju-backup/metadata.json")
}
func extractMachineID(archive *os.File) (string, error) {
paths := backups.NewCanonicalArchivePaths()
gzr, err := gzip.NewReader(archive)
if err != nil {
return "", errors.Annotate(err, fmt.Sprintf("cannot unzip %q", archive.Name()))
}
defer gzr.Close()
metaFile, err := findFileInTar(gzr, paths.MetadataFile)
if errors.IsNotFound(err) {
// Older archives don't have a metadata file and always have machine-0.
return "0", nil
}
if err != nil {
return "", errors.Trace(err)
}
meta, err := backups.NewMetadataJSONReader(metaFile)
if err != nil {
return "", errors.Trace(err)
}
return meta.Origin.Machine, nil
}