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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 (
"path"
"strconv"
"github.com/coreos/go-semver/semver"
"github.com/coreos/fleet/etcd"
)
// 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 isKeyNotFound(err) {
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) {
req := etcd.Get{
Key: r.engineVersionPath(),
}
res, err := r.etcd.Do(&req)
if err != nil {
// no big deal, either the cluster is new or is just
// upgrading from old unversioned code
if isKeyNotFound(err) {
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)
var req etcd.Action
req = &etcd.Set{
Key: key,
Value: strTo,
PreviousValue: strFrom,
}
_, err := r.etcd.Do(req)
if err == nil {
return nil
} else if !isKeyNotFound(err) {
return err
}
req = &etcd.Create{
Key: key,
Value: strTo,
}
_, err = r.etcd.Do(req)
return err
}
func (r *EtcdRegistry) engineVersionPath() string {
return path.Join(r.keyPrefix, "/engine/version")
}