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version.go
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version.go
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// Copyright 2014 CoreOS, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package registry
import (
"strconv"
etcd "github.com/coreos/fleet/Godeps/_workspace/src/github.com/coreos/etcd/client"
"github.com/coreos/fleet/Godeps/_workspace/src/github.com/coreos/go-semver/semver"
)
// LatestDaemonVersion attempts to retrieve the latest version of fleetd
// that has been registered in the Registry. It returns the version if
// it can be determined (or nil otherwise), and any error encountered.
func (r *EtcdRegistry) LatestDaemonVersion() (*semver.Version, error) {
machs, err := r.Machines()
if err != nil {
if isEtcdError(err, etcd.ErrorCodeKeyNotFound) {
err = nil
}
return nil, err
}
var lv *semver.Version
for _, m := range machs {
v, err := semver.NewVersion(m.Version)
if err != nil {
continue
} else if lv == nil || lv.LessThan(*v) {
lv = v
}
}
return lv, nil
}
// EngineVersion implements the ClusterRegistry interface
func (r *EtcdRegistry) EngineVersion() (int, error) {
res, err := r.kAPI.Get(r.ctx(), r.engineVersionPath(), nil)
if err != nil {
// no big deal, either the cluster is new or is just
// upgrading from old unversioned code
if isEtcdError(err, etcd.ErrorCodeKeyNotFound) {
err = nil
}
return 0, err
}
return strconv.Atoi(res.Node.Value)
}
// UpdateEngineVersion implements the ClusterRegistry interface
func (r *EtcdRegistry) UpdateEngineVersion(from, to int) error {
key := r.engineVersionPath()
strTo := strconv.Itoa(to)
strFrom := strconv.Itoa(from)
opts := &etcd.SetOptions{
PrevValue: strFrom,
}
_, err := r.kAPI.Set(r.ctx(), key, strTo, opts)
if err == nil {
return nil
} else if !isEtcdError(err, etcd.ErrorCodeKeyNotFound) {
return err
}
opts = &etcd.SetOptions{
PrevExist: etcd.PrevNoExist,
}
_, err = r.kAPI.Set(r.ctx(), key, strTo, opts)
return err
}
func (r *EtcdRegistry) engineVersionPath() string {
return r.prefixed("/engine/version")
}