93 lines
2.2 KiB
Go
93 lines
2.2 KiB
Go
package restic
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import (
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"context"
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"sync"
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"testing"
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"github.com/restic/restic/internal/errors"
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"github.com/restic/restic/internal/debug"
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"github.com/restic/chunker"
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)
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// Config contains the configuration for a repository.
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type Config struct {
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Version uint `json:"version"`
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ID string `json:"id"`
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ChunkerPolynomial chunker.Pol `json:"chunker_polynomial"`
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}
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const MinRepoVersion = 1
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const MaxRepoVersion = 2
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// StableRepoVersion is the version that is written to the config when a repository
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// is newly created with Init().
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const StableRepoVersion = 2
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// JSONUnpackedLoader loads unpacked JSON.
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type JSONUnpackedLoader interface {
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LoadJSONUnpacked(context.Context, FileType, ID, interface{}) error
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}
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// CreateConfig creates a config file with a randomly selected polynomial and
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// ID.
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func CreateConfig(version uint) (Config, error) {
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var (
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err error
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cfg Config
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)
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cfg.ChunkerPolynomial, err = chunker.RandomPolynomial()
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if err != nil {
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return Config{}, errors.Wrap(err, "chunker.RandomPolynomial")
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}
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cfg.ID = NewRandomID().String()
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cfg.Version = version
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debug.Log("New config: %#v", cfg)
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return cfg, nil
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}
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var checkPolynomial = true
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var checkPolynomialOnce sync.Once
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// TestDisableCheckPolynomial disables the check that the polynomial used for
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// the chunker.
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func TestDisableCheckPolynomial(t testing.TB) {
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t.Logf("disabling check of the chunker polynomial")
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checkPolynomialOnce.Do(func() {
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checkPolynomial = false
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})
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}
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// LoadConfig returns loads, checks and returns the config for a repository.
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func LoadConfig(ctx context.Context, r LoaderUnpacked) (Config, error) {
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var (
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cfg Config
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)
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err := LoadJSONUnpacked(ctx, r, ConfigFile, ID{}, &cfg)
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if err != nil {
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return Config{}, err
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}
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if cfg.Version < MinRepoVersion || cfg.Version > MaxRepoVersion {
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return Config{}, errors.Errorf("unsupported repository version %v", cfg.Version)
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}
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if checkPolynomial {
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if !cfg.ChunkerPolynomial.Irreducible() {
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return Config{}, errors.New("invalid chunker polynomial")
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}
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}
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return cfg, nil
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}
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func SaveConfig(ctx context.Context, r SaverUnpacked, cfg Config) error {
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_, err := SaveJSONUnpacked(ctx, r, ConfigFile, cfg)
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return err
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}
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