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// Copyright 2018 The gVisor 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
//
// https://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 utils container miscellaneous utility function used by the shim.
package utils
import (
"encoding/json"
"io/ioutil"
"path/filepath"
specs "github.com/opencontainers/runtime-spec/specs-go"
)
const configFilename = "config.json"
// ReadSpec reads OCI spec from the bundle directory.
func ReadSpec(bundle string) (*specs.Spec, error) {
b, err := ioutil.ReadFile(filepath.Join(bundle, configFilename))
if err != nil {
return nil, err
}
var spec specs.Spec
if err := json.Unmarshal(b, &spec); err != nil {
return nil, err
}
return &spec, nil
}
// WriteSpec writes OCI spec to the bundle directory.
func WriteSpec(bundle string, spec *specs.Spec) error {
b, err := json.Marshal(spec)
if err != nil {
return err
}
return ioutil.WriteFile(filepath.Join(bundle, configFilename), b, 0666)
}
// IsSandbox checks whether a container is a sandbox container.
func IsSandbox(spec *specs.Spec) bool {
t, ok := spec.Annotations[ContainerTypeAnnotation]
return !ok || t == containerTypeSandbox
}
// UserLogPath gets user log path from OCI annotation.
func UserLogPath(spec *specs.Spec) string {
sandboxLogDir := spec.Annotations[sandboxLogDirAnnotation]
if sandboxLogDir == "" {
return ""
}
return filepath.Join(sandboxLogDir, "gvisor.log")
}
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