mirror of
https://github.com/octoleo/restic.git
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ff7ef5007e
The ioutil functions are deprecated since Go 1.17 and only wrap another library function. Thus directly call the underlying function. This commit only mechanically replaces the function calls.
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/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(ctx 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 := restic.Handle{Type: restic.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 := restic.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, restic.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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