mirror of
https://github.com/etcd-io/etcd.git
synced 2024-09-27 06:25:44 +00:00
94 lines
2.5 KiB
Go
94 lines
2.5 KiB
Go
/*
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Copyright 2014 CoreOS, Inc.
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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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http://www.apache.org/licenses/LICENSE-2.0
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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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*/
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package command
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import (
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"log"
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"math/rand"
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"os"
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"path"
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"time"
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"github.com/coreos/etcd/Godeps/_workspace/src/github.com/codegangsta/cli"
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"github.com/coreos/etcd/etcdserver"
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"github.com/coreos/etcd/etcdserver/etcdserverpb"
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"github.com/coreos/etcd/pkg/pbutil"
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"github.com/coreos/etcd/snap"
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"github.com/coreos/etcd/wal"
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)
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func NewBackupCommand() cli.Command {
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return cli.Command{
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Name: "backup",
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Usage: "backup an etcd directory",
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Flags: []cli.Flag{
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cli.StringFlag{Name: "data-dir", Value: "", Usage: "Path to the etcd data dir"},
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cli.StringFlag{Name: "backup-dir", Value: "", Usage: "Path to the backup dir"},
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},
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Action: handleBackup,
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}
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}
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// handleBackup handles a request that intends to do a backup.
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func handleBackup(c *cli.Context) {
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srcSnap := path.Join(c.String("data-dir"), "snap")
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destSnap := path.Join(c.String("backup-dir"), "snap")
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srcWAL := path.Join(c.String("data-dir"), "wal")
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destWAL := path.Join(c.String("backup-dir"), "wal")
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if err := os.MkdirAll(destSnap, 0700); err != nil {
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log.Fatalf("failed creating backup snapshot dir %v: %v", destSnap, err)
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}
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ss := snap.New(srcSnap)
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snapshot, err := ss.Load()
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if err != nil && err != snap.ErrNoSnapshot {
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log.Fatal(err)
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}
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var index uint64
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if snapshot != nil {
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index = snapshot.Metadata.Index
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newss := snap.New(destSnap)
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if err := newss.SaveSnap(*snapshot); err != nil {
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log.Fatal(err)
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}
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}
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w, err := wal.OpenNotInUse(srcWAL, index)
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if err != nil {
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log.Fatal(err)
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}
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defer w.Close()
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wmetadata, state, ents, err := w.ReadAll()
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if err != nil {
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log.Fatal(err)
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}
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var metadata etcdserverpb.Metadata
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pbutil.MustUnmarshal(&metadata, wmetadata)
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rand.Seed(time.Now().UnixNano())
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metadata.NodeID = etcdserver.GenID()
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metadata.ClusterID = etcdserver.GenID()
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neww, err := wal.Create(destWAL, pbutil.MustMarshal(&metadata))
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if err != nil {
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log.Fatal(err)
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}
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defer neww.Close()
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if err := neww.Save(state, ents); err != nil {
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log.Fatal(err)
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}
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}
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