func dump4(dataDir string) ([]raftpb.Entry, error) {
lf4 := logFile4(dataDir)
ents, err := migrate.DecodeLog4FromFile(lf4)
if err != nil {
return nil, err
}
return migrate.Entries4To2(ents)
}
func checkInternalVersionByDataDir4(dataDir string) (version, error) {
// check v0.4 snapshot
snap4, err := migrate.DecodeLatestSnapshot4FromDir(snapDir4(dataDir))
if err != nil {
return internalUnknown, err
}
if snap4 != nil {
st := &migrate.Store4{}
if err := json.Unmarshal(snap4.State, st); err != nil {
return internalUnknown, err
}
dir := st.Root.Children["_etcd"]
n, ok := dir.Children["next-internal-version"]
if ok && n.Value == "2" {
return internalV2, nil
}
}
// check v0.4 log
ents4, err := migrate.DecodeLog4FromFile(logFile4(dataDir))
if err != nil {
return internalUnknown, err
}
for _, e := range ents4 {
cmd, err := migrate.NewCommand4(e.GetCommandName(), e.GetCommand(), nil)
if err != nil {
return internalUnknown, err
}
setcmd, ok := cmd.(*migrate.SetCommand)
if !ok {
continue
}
if setcmd.Key == "/_etcd/next-internal-version" && setcmd.Value == "2" {
return internalV2, nil
}
}
return internalV1, nil
}