69 lines
1.6 KiB
Go
69 lines
1.6 KiB
Go
package impl
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import (
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"context"
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"os"
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"path/filepath"
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"strings"
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"github.com/mitchellh/go-homedir"
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"golang.org/x/xerrors"
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"github.com/filecoin-project/lotus/lib/backupds"
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"github.com/filecoin-project/lotus/node/modules/dtypes"
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)
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func backup(ctx context.Context, mds dtypes.MetadataDS, fpath string) error {
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bb, ok := os.LookupEnv("LOTUS_BACKUP_BASE_PATH")
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if !ok {
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return xerrors.Errorf("LOTUS_BACKUP_BASE_PATH env var not set")
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}
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bds, ok := mds.(*backupds.Datastore)
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if !ok {
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return xerrors.Errorf("expected a backup datastore")
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}
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bb, err := homedir.Expand(bb)
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if err != nil {
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return xerrors.Errorf("expanding base path: %w", err)
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}
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bb, err = filepath.Abs(bb)
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if err != nil {
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return xerrors.Errorf("getting absolute base path: %w", err)
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}
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fpath, err = homedir.Expand(fpath)
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if err != nil {
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return xerrors.Errorf("expanding file path: %w", err)
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}
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fpath, err = filepath.Abs(fpath)
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if err != nil {
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return xerrors.Errorf("getting absolute file path: %w", err)
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}
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if !strings.HasPrefix(fpath, bb) {
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return xerrors.Errorf("backup file name (%s) must be inside base path (%s)", fpath, bb)
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}
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out, err := os.OpenFile(fpath, os.O_CREATE|os.O_WRONLY, 0644)
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if err != nil {
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return xerrors.Errorf("open %s: %w", fpath, err)
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}
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if err := bds.Backup(ctx, out); err != nil {
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if cerr := out.Close(); cerr != nil {
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log.Errorw("error closing backup file while handling backup error", "closeErr", cerr, "backupErr", err)
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}
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return xerrors.Errorf("backup error: %w", err)
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}
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if err := out.Close(); err != nil {
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return xerrors.Errorf("closing backup file: %w", err)
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}
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return nil
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}
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