restic/internal/config.go

81 lines
1.8 KiB
Go

package restic
import (
"context"
"testing"
"github.com/restic/restic/internal/errors"
"github.com/restic/restic/internal/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
}