package restic import ( "context" "testing" "restic/errors" "restic/debug" "github.com/restic/chunker" ) // Config contains the configuration for a repository. type Config struct { Version uint `json:"version"` ID string `json:"id"` ChunkerPolynomial chunker.Pol `json:"chunker_polynomial"` } // RepoVersion is the version that is written to the config when a repository // is newly created with Init(). const RepoVersion = 1 // JSONUnpackedLoader loads unpacked JSON. type JSONUnpackedLoader interface { LoadJSONUnpacked(context.Context, FileType, ID, interface{}) error } // CreateConfig creates a config file with a randomly selected polynomial and // ID. func CreateConfig() (Config, error) { var ( err error cfg Config ) cfg.ChunkerPolynomial, err = chunker.RandomPolynomial() if err != nil { return Config{}, errors.Wrap(err, "chunker.RandomPolynomial") } cfg.ID = NewRandomID().String() cfg.Version = RepoVersion debug.Log("New config: %#v", cfg) return cfg, nil } // TestCreateConfig creates a config for use within tests. func TestCreateConfig(t testing.TB, pol chunker.Pol) (cfg Config) { cfg.ChunkerPolynomial = pol cfg.ID = NewRandomID().String() cfg.Version = RepoVersion return cfg } // LoadConfig returns loads, checks and returns the config for a repository. func LoadConfig(ctx context.Context, r JSONUnpackedLoader) (Config, error) { var ( cfg Config ) err := r.LoadJSONUnpacked(ctx, ConfigFile, ID{}, &cfg) if err != nil { return Config{}, err } if cfg.Version != RepoVersion { return Config{}, errors.New("unsupported repository version") } if !cfg.ChunkerPolynomial.Irreducible() { return Config{}, errors.New("invalid chunker polynomial") } return cfg, nil }