98 lines
2.6 KiB
Go
98 lines
2.6 KiB
Go
// Copyright 2015 CoreOS, Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package version
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import (
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"encoding/json"
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"log"
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"os"
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"path"
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"github.com/coreos/etcd/pkg/fileutil"
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"github.com/coreos/etcd/pkg/types"
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)
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var (
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// MinClusterVersion is the min cluster version this etcd binary is compatible with.
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MinClusterVersion = "2.0.0"
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Version = "2.1.0-alpha.0+git"
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)
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// WalVersion is an enum for versions of etcd logs.
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type DataDirVersion string
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const (
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DataDirUnknown DataDirVersion = "Unknown WAL"
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DataDir0_4 DataDirVersion = "0.4.x"
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DataDir2_0 DataDirVersion = "2.0.0"
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DataDir2_0Proxy DataDirVersion = "2.0 proxy"
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DataDir2_0_1 DataDirVersion = "2.0.1"
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)
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type Versions struct {
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Server string `json:"etcdserver"`
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// TODO: etcdcluster version
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// TODO: raft state machine version
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}
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// MarshalJSON returns the JSON encoding of Versions struct.
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func MarshalJSON() []byte {
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b, err := json.Marshal(Versions{Server: Version})
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if err != nil {
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log.Panicf("version: cannot marshal versions to json (%v)", err)
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}
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return b
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}
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func DetectDataDir(dirpath string) (DataDirVersion, error) {
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names, err := fileutil.ReadDir(dirpath)
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if err != nil {
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if os.IsNotExist(err) {
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err = nil
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}
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// Error reading the directory
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return DataDirUnknown, err
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}
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nameSet := types.NewUnsafeSet(names...)
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if nameSet.Contains("member") {
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ver, err := DetectDataDir(path.Join(dirpath, "member"))
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if ver == DataDir2_0 {
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return DataDir2_0_1, nil
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} else if ver == DataDir0_4 {
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// How in the blazes did it get there?
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return DataDirUnknown, nil
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}
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return ver, err
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}
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if nameSet.ContainsAll([]string{"snap", "wal"}) {
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// .../wal cannot be empty to exist.
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walnames, err := fileutil.ReadDir(path.Join(dirpath, "wal"))
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if err == nil && len(walnames) > 0 {
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return DataDir2_0, nil
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}
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}
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if nameSet.ContainsAll([]string{"proxy"}) {
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return DataDir2_0Proxy, nil
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}
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if nameSet.ContainsAll([]string{"snapshot", "conf", "log"}) {
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return DataDir0_4, nil
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}
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if nameSet.ContainsAll([]string{"standby_info"}) {
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return DataDir0_4, nil
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}
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return DataDirUnknown, nil
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}
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