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operator_migrate.go
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/
operator_migrate.go
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package command
import (
"context"
"fmt"
"io/ioutil"
"os"
"sort"
"strings"
"time"
"github.com/hashicorp/errwrap"
log "github.com/hashicorp/go-hclog"
"github.com/hashicorp/hcl"
"github.com/hashicorp/hcl/hcl/ast"
"github.com/hashicorp/vault/command/server"
"github.com/hashicorp/vault/helper/logging"
"github.com/hashicorp/vault/physical"
"github.com/hashicorp/vault/vault"
"github.com/mitchellh/cli"
"github.com/pkg/errors"
"github.com/posener/complete"
)
var _ cli.Command = (*OperatorMigrateCommand)(nil)
var _ cli.CommandAutocomplete = (*OperatorMigrateCommand)(nil)
var errAbort = errors.New("Migration aborted")
type OperatorMigrateCommand struct {
*BaseCommand
PhysicalBackends map[string]physical.Factory
flagConfig string
flagStart string
flagReset bool
logger log.Logger
ShutdownCh chan struct{}
}
type migratorConfig struct {
StorageSource *server.Storage `hcl:"-"`
StorageDestination *server.Storage `hcl:"-"`
}
func (c *OperatorMigrateCommand) Synopsis() string {
return "Migrates Vault data between storage backends"
}
func (c *OperatorMigrateCommand) Help() string {
helpText := `
Usage: vault operator migrate [options]
This command starts a storage backend migration process to copy all data
from one backend to another. This operates directly on encrypted data and
does not require a Vault server, nor any unsealing.
Start a migration with a configuration file:
$ vault operator migrate -config=migrate.hcl
For more information, please see the documentation.
` + c.Flags().Help()
return strings.TrimSpace(helpText)
}
func (c *OperatorMigrateCommand) Flags() *FlagSets {
set := NewFlagSets(c.UI)
f := set.NewFlagSet("Command Options")
f.StringVar(&StringVar{
Name: "config",
Target: &c.flagConfig,
Completion: complete.PredictOr(
complete.PredictFiles("*.hcl"),
),
Usage: "Path to a configuration file. This configuration file should " +
"contain only migrator directives.",
})
f.StringVar(&StringVar{
Name: "start",
Target: &c.flagStart,
Usage: "Only copy keys lexicographically at or after this value.",
})
f.BoolVar(&BoolVar{
Name: "reset",
Target: &c.flagReset,
Usage: "Reset the migration lock. No migration will occur.",
})
return set
}
func (c *OperatorMigrateCommand) AutocompleteArgs() complete.Predictor {
return nil
}
func (c *OperatorMigrateCommand) AutocompleteFlags() complete.Flags {
return c.Flags().Completions()
}
func (c *OperatorMigrateCommand) Run(args []string) int {
c.logger = logging.NewVaultLogger(log.Info)
f := c.Flags()
if err := f.Parse(args); err != nil {
c.UI.Error(err.Error())
return 1
}
if c.flagConfig == "" {
c.UI.Error("Must specify exactly one config path using -config")
return 1
}
config, err := c.loadMigratorConfig(c.flagConfig)
if err != nil {
c.UI.Error(fmt.Sprintf("Error loading configuration from %s: %s", c.flagConfig, err))
return 1
}
if err := c.migrate(config); err != nil {
if err == errAbort {
return 0
}
c.UI.Error(fmt.Sprintf("Error migrating: %s", err))
return 2
}
if c.flagReset {
c.UI.Output("Success! Migration lock reset (if it was set).")
} else {
c.UI.Output("Success! All of the keys have been migrated.")
}
return 0
}
// migrate attempts to instantiate the source and destinations backends,
// and then invoke the migration the the root of the keyspace.
func (c *OperatorMigrateCommand) migrate(config *migratorConfig) error {
from, err := c.newBackend(config.StorageSource.Type, config.StorageSource.Config)
if err != nil {
return errwrap.Wrapf("error mounting 'storage_source': {{err}}", err)
}
if c.flagReset {
if err := SetStorageMigration(from, false); err != nil {
return errwrap.Wrapf("error reseting migration lock: {{err}}", err)
}
return nil
}
to, err := c.newBackend(config.StorageDestination.Type, config.StorageDestination.Config)
if err != nil {
return errwrap.Wrapf("error mounting 'storage_destination': {{err}}", err)
}
migrationStatus, err := CheckStorageMigration(from)
if err != nil {
return errwrap.Wrapf("error checking migration status: {{err}}", err)
}
if migrationStatus != nil {
return fmt.Errorf("Storage migration in progress (started: %s).", migrationStatus.Start.Format(time.RFC3339))
}
if err := SetStorageMigration(from, true); err != nil {
return errwrap.Wrapf("error setting migration lock: {{err}}", err)
}
defer SetStorageMigration(from, false)
ctx, cancelFunc := context.WithCancel(context.Background())
doneCh := make(chan error)
go func() {
doneCh <- c.migrateAll(ctx, from, to)
}()
select {
case err := <-doneCh:
cancelFunc()
return err
case <-c.ShutdownCh:
c.UI.Output("==> Migration shutdown triggered\n")
cancelFunc()
<-doneCh
return errAbort
}
}
// migrateAll copies all keys in lexicographic order.
func (c *OperatorMigrateCommand) migrateAll(ctx context.Context, from physical.Backend, to physical.Backend) error {
return dfsScan(ctx, from, func(ctx context.Context, path string) error {
if path < c.flagStart || path == storageMigrationLock || path == vault.CoreLockPath {
return nil
}
entry, err := from.Get(ctx, path)
if err != nil {
return errwrap.Wrapf("error reading entry: {{err}}", err)
}
if entry == nil {
return nil
}
if err := to.Put(ctx, entry); err != nil {
return errwrap.Wrapf("error writing entry: {{err}}", err)
}
c.logger.Info("copied key", "path", path)
return nil
})
}
func (c *OperatorMigrateCommand) newBackend(kind string, conf map[string]string) (physical.Backend, error) {
factory, ok := c.PhysicalBackends[kind]
if !ok {
return nil, fmt.Errorf("no Vault storage backend named: %+q", kind)
}
return factory(conf, c.logger)
}
// loadMigratorConfig loads the configuration at the given path
func (c *OperatorMigrateCommand) loadMigratorConfig(path string) (*migratorConfig, error) {
fi, err := os.Stat(path)
if err != nil {
return nil, err
}
if fi.IsDir() {
return nil, fmt.Errorf("location is a directory, not a file")
}
d, err := ioutil.ReadFile(path)
if err != nil {
return nil, err
}
obj, err := hcl.ParseBytes(d)
if err != nil {
return nil, err
}
var result migratorConfig
if err := hcl.DecodeObject(&result, obj); err != nil {
return nil, err
}
list, ok := obj.Node.(*ast.ObjectList)
if !ok {
return nil, fmt.Errorf("error parsing: file doesn't contain a root object")
}
// Look for storage_* stanzas
for _, stanza := range []string{"storage_source", "storage_destination"} {
o := list.Filter(stanza)
if len(o.Items) != 1 {
return nil, fmt.Errorf("exactly one '%s' block is required", stanza)
}
if err := parseStorage(&result, o, stanza); err != nil {
return nil, errwrap.Wrapf("error parsing '%s': {{err}}", err)
}
}
return &result, nil
}
// parseStorage reuses the existing storage parsing that's part of the main Vault
// config processing, but only keeps the storage result.
func parseStorage(result *migratorConfig, list *ast.ObjectList, name string) error {
tmpConfig := new(server.Config)
if err := server.ParseStorage(tmpConfig, list, name); err != nil {
return err
}
switch name {
case "storage_source":
result.StorageSource = tmpConfig.Storage
case "storage_destination":
result.StorageDestination = tmpConfig.Storage
default:
return fmt.Errorf("unknown storage name: %s", name)
}
return nil
}
// dfsScan will invoke cb with every key from source.
// Keys will be traversed in lexicographic, depth-first order.
func dfsScan(ctx context.Context, source physical.Backend, cb func(ctx context.Context, path string) error) error {
dfs := []string{""}
for l := len(dfs); l > 0; l = len(dfs) {
key := dfs[len(dfs)-1]
if key == "" || strings.HasSuffix(key, "/") {
children, err := source.List(ctx, key)
if err != nil {
return errwrap.Wrapf("failed to scan for children: {{err}}", err)
}
sort.Strings(children)
// remove List-triggering key and add children in reverse order
dfs = dfs[:len(dfs)-1]
for i := len(children) - 1; i >= 0; i-- {
if children[i] != "" {
dfs = append(dfs, key+children[i])
}
}
} else {
err := cb(ctx, key)
if err != nil {
return err
}
dfs = dfs[:len(dfs)-1]
}
select {
case <-ctx.Done():
return nil
default:
}
}
return nil
}