forked from TrueCloudLab/restic
130 lines
3.3 KiB
Go
130 lines
3.3 KiB
Go
package migrations
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import (
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"context"
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"fmt"
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"io"
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"os"
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"path/filepath"
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"github.com/restic/restic/internal/backend"
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"github.com/restic/restic/internal/restic"
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)
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func init() {
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register(&UpgradeRepoV2{})
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}
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type UpgradeRepoV2Error struct {
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UploadNewConfigError error
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ReuploadOldConfigError error
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BackupFilePath string
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}
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func (err *UpgradeRepoV2Error) Error() string {
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if err.ReuploadOldConfigError != nil {
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return fmt.Sprintf("error uploading config (%v), re-uploading old config filed failed as well (%v), but there is a backup of the config file in %v", err.UploadNewConfigError, err.ReuploadOldConfigError, err.BackupFilePath)
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}
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return fmt.Sprintf("error uploading config (%v), re-uploaded old config was successful, there is a backup of the config file in %v", err.UploadNewConfigError, err.BackupFilePath)
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}
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func (err *UpgradeRepoV2Error) Unwrap() error {
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// consider the original upload error as the primary cause
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return err.UploadNewConfigError
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}
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type UpgradeRepoV2 struct{}
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func (*UpgradeRepoV2) Name() string {
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return "upgrade_repo_v2"
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}
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func (*UpgradeRepoV2) Desc() string {
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return "upgrade a repository to version 2"
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}
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func (*UpgradeRepoV2) Check(_ context.Context, repo restic.Repository) (bool, string, error) {
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isV1 := repo.Config().Version == 1
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reason := ""
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if !isV1 {
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reason = fmt.Sprintf("repository is already upgraded to version %v", repo.Config().Version)
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}
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return isV1, reason, nil
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}
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func (*UpgradeRepoV2) RepoCheck() bool {
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return true
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}
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func (*UpgradeRepoV2) upgrade(ctx context.Context, repo restic.Repository) error {
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h := backend.Handle{Type: backend.ConfigFile}
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if !repo.Backend().HasAtomicReplace() {
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// remove the original file for backends which do not support atomic overwriting
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err := repo.Backend().Remove(ctx, h)
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if err != nil {
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return fmt.Errorf("remove config failed: %w", err)
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}
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}
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// upgrade config
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cfg := repo.Config()
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cfg.Version = 2
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err := restic.SaveConfig(ctx, repo, cfg)
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if err != nil {
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return fmt.Errorf("save new config file failed: %w", err)
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}
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return nil
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}
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func (m *UpgradeRepoV2) Apply(ctx context.Context, repo restic.Repository) error {
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tempdir, err := os.MkdirTemp("", "restic-migrate-upgrade-repo-v2-")
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if err != nil {
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return fmt.Errorf("create temp dir failed: %w", err)
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}
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h := backend.Handle{Type: restic.ConfigFile}
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// read raw config file and save it to a temp dir, just in case
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var rawConfigFile []byte
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err = repo.Backend().Load(ctx, h, 0, 0, func(rd io.Reader) (err error) {
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rawConfigFile, err = io.ReadAll(rd)
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return err
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})
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if err != nil {
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return fmt.Errorf("load config file failed: %w", err)
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}
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backupFileName := filepath.Join(tempdir, "config")
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err = os.WriteFile(backupFileName, rawConfigFile, 0600)
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if err != nil {
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return fmt.Errorf("write config file backup to %v failed: %w", tempdir, err)
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}
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// run the upgrade
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err = m.upgrade(ctx, repo)
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if err != nil {
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// build an error we can return to the caller
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repoError := &UpgradeRepoV2Error{
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UploadNewConfigError: err,
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BackupFilePath: backupFileName,
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}
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// try contingency methods, reupload the original file
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_ = repo.Backend().Remove(ctx, h)
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err = repo.Backend().Save(ctx, h, backend.NewByteReader(rawConfigFile, nil))
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if err != nil {
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repoError.ReuploadOldConfigError = err
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}
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return repoError
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}
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_ = os.Remove(backupFileName)
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_ = os.Remove(tempdir)
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return nil
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}
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