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/
manifest.go
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/
manifest.go
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// Copyright 2016 The rkt Authors
//
// 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.
//+build linux
package stage0
import (
"encoding/json"
"errors"
"fmt"
"io/ioutil"
"strconv"
"github.com/appc/spec/schema"
"github.com/hashicorp/errwrap"
"github.com/rkt/rkt/common"
)
const (
enterEntrypoint = "coreos.com/rkt/stage1/enter"
runEntrypoint = "coreos.com/rkt/stage1/run"
gcEntrypoint = "coreos.com/rkt/stage1/gc"
stopEntrypoint = "coreos.com/rkt/stage1/stop"
attachEntrypoint = "coreos.com/rkt/stage1/attach"
appAddEntrypoint = "coreos.com/rkt/stage1/app/add"
appRmEntrypoint = "coreos.com/rkt/stage1/app/rm"
appStartEntrypoint = "coreos.com/rkt/stage1/app/start"
appStopEntrypoint = "coreos.com/rkt/stage1/app/stop"
)
const (
interfaceVersion = "coreos.com/rkt/stage1/interface-version"
)
// supportsMutableEnvironment returns whether the given stage1 image supports mutable pod operations.
// It introspects the stage1 manifest and checks the presence of app* entrypoints.
func supportsMutableEnvironment(cdir string) (bool, error) {
b, err := ioutil.ReadFile(common.Stage1ManifestPath(cdir))
if err != nil {
return false, errwrap.Wrap(errors.New("error reading pod manifest"), err)
}
s1m := schema.ImageManifest{}
if err := json.Unmarshal(b, &s1m); err != nil {
return false, errwrap.Wrap(errors.New("error unmarshaling stage1 manifest"), err)
}
_, appRmOk := s1m.Annotations.Get(appRmEntrypoint)
_, appStartOk := s1m.Annotations.Get(appStartEntrypoint)
_, appStopOk := s1m.Annotations.Get(appStopEntrypoint)
return appRmOk && appStartOk && appStopOk, nil
}
// getStage1Entrypoint retrieves the named entrypoint from the stage1 manifest for a given pod
func getStage1Entrypoint(cdir string, entrypoint string) (string, error) {
b, err := ioutil.ReadFile(common.Stage1ManifestPath(cdir))
if err != nil {
return "", errwrap.Wrap(errors.New("error reading pod manifest"), err)
}
s1m := schema.ImageManifest{}
if err := json.Unmarshal(b, &s1m); err != nil {
return "", errwrap.Wrap(errors.New("error unmarshaling stage1 manifest"), err)
}
if ep, ok := s1m.Annotations.Get(entrypoint); ok {
return ep, nil
}
return "", fmt.Errorf("entrypoint %q not found", entrypoint)
}
// getStage1InterfaceVersion retrieves the interface version from the stage1
// manifest for a given pod
func getStage1InterfaceVersion(cdir string) (int, error) {
b, err := ioutil.ReadFile(common.Stage1ManifestPath(cdir))
if err != nil {
return -1, errwrap.Wrap(errors.New("error reading pod manifest"), err)
}
s1m := schema.ImageManifest{}
if err := json.Unmarshal(b, &s1m); err != nil {
return -1, errwrap.Wrap(errors.New("error unmarshaling stage1 manifest"), err)
}
if iv, ok := s1m.Annotations.Get(interfaceVersion); ok {
v, err := strconv.Atoi(iv)
if err != nil {
return -1, errwrap.Wrap(errors.New("error parsing interface version"), err)
}
return v, nil
}
// "interface-version" annotation not found, assume version 1
return 1, nil
}
func interfaceVersionSupportsHostname(version int) bool {
return version > 1
}
func interfaceVersionSupportsInsecureOptions(version int) bool {
return version > 2
}
// support --dns-mode and --hostentry
func interfaceVersionSupportsDNSConfMode(version int) bool {
return version > 3
}
func interfaceVersionSupportsGCLocalConfig(version int) bool {
return version >= 5
}
func interfaceVersionSupportsIPCMode(version int) bool {
return version >= 6
}