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entrypoint.go
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entrypoint.go
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// Copyright 2015 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"
"fmt"
"io/ioutil"
"github.com/coreos/rkt/Godeps/_workspace/src/github.com/appc/spec/schema"
"github.com/coreos/rkt/common"
)
const (
enterEntrypoint = "coreos.com/rkt/stage1/enter"
runEntrypoint = "coreos.com/rkt/stage1/run"
gcEntrypoint = "coreos.com/rkt/stage1/gc"
)
// 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 "", fmt.Errorf("error reading pod manifest: %v", err)
}
s1m := schema.ImageManifest{}
if err := json.Unmarshal(b, &s1m); err != nil {
return "", fmt.Errorf("error unmarshaling stage1 manifest: %v", err)
}
if ep, ok := s1m.Annotations.Get(entrypoint); ok {
return ep, nil
}
return "", fmt.Errorf("entrypoint %q not found", entrypoint)
}