lotus/cli/backup.go

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2020-10-01 15:14:08 +00:00
package cli
import (
"context"
"fmt"
"os"
logging "github.com/ipfs/go-log/v2"
"github.com/mitchellh/go-homedir"
"github.com/urfave/cli/v2"
"golang.org/x/xerrors"
"github.com/filecoin-project/go-jsonrpc"
"github.com/filecoin-project/lotus/lib/backupds"
"github.com/filecoin-project/lotus/node/repo"
)
type BackupAPI interface {
CreateBackup(ctx context.Context, fpath string) error
}
type BackupApiFn func(ctx *cli.Context) (BackupAPI, jsonrpc.ClientCloser, error)
func BackupCmd(repoFlag string, rt repo.RepoType, getApi BackupApiFn) *cli.Command {
var offlineBackup = func(cctx *cli.Context) error {
logging.SetLogLevel("badger", "ERROR") // nolint:errcheck
repoPath := cctx.String(repoFlag)
r, err := repo.NewFS(repoPath)
if err != nil {
return err
}
ok, err := r.Exists()
if err != nil {
return err
}
if !ok {
return xerrors.Errorf("repo at '%s' is not initialized", cctx.String(repoFlag))
}
lr, err := r.LockRO(rt)
if err != nil {
return xerrors.Errorf("locking repo: %w", err)
}
defer lr.Close() // nolint:errcheck
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mds, err := lr.Datastore(context.TODO(), "/metadata")
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if err != nil {
return xerrors.Errorf("getting metadata datastore: %w", err)
}
bds := backupds.Wrap(mds)
fpath, err := homedir.Expand(cctx.Args().First())
if err != nil {
return xerrors.Errorf("expanding file path: %w", err)
}
out, err := os.OpenFile(fpath, os.O_CREATE|os.O_WRONLY, 0644)
if err != nil {
return xerrors.Errorf("opening backup file %s: %w", fpath, err)
}
if err := bds.Backup(out); err != nil {
if cerr := out.Close(); cerr != nil {
log.Errorw("error closing backup file while handling backup error", "closeErr", cerr, "backupErr", err)
}
return xerrors.Errorf("backup error: %w", err)
}
if err := out.Close(); err != nil {
return xerrors.Errorf("closing backup file: %w", err)
}
return nil
}
var onlineBackup = func(cctx *cli.Context) error {
api, closer, err := getApi(cctx)
if err != nil {
return xerrors.Errorf("getting api: %w (if the node isn't running you can use the --offline flag)", err)
}
defer closer()
err = api.CreateBackup(ReqContext(cctx), cctx.Args().First())
if err != nil {
return err
}
fmt.Println("Success")
return nil
}
return &cli.Command{
Name: "backup",
Usage: "Create node metadata backup",
Description: `The backup command writes a copy of node metadata under the specified path
Online backups:
For security reasons, the daemon must be have LOTUS_BACKUP_BASE_PATH env var set
to a path where backup files are supposed to be saved, and the path specified in
this command must be within this base path`,
Flags: []cli.Flag{
&cli.BoolFlag{
Name: "offline",
Usage: "create backup without the node running",
},
},
ArgsUsage: "[backup file path]",
Action: func(cctx *cli.Context) error {
if cctx.Args().Len() != 1 {
return xerrors.Errorf("expected 1 argument")
}
if cctx.Bool("offline") {
return offlineBackup(cctx)
}
return onlineBackup(cctx)
},
}
}