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/*
Copyright The containerd Authors.
Copyright 2018 Google LLC
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 proc
import (
"encoding/json"
"io"
"os"
"strings"
"time"
runsc "github.com/google/gvisor-containerd-shim/pkg/go-runsc"
)
const (
internalErrorCode = 128
bufferSize = 32
)
// ExitCh is the exit events channel for containers and exec processes
// inside the sandbox.
var ExitCh = make(chan Exit, bufferSize)
// TODO(random-liu): This can be a utility.
// TODO(mlaventure): move to runc package?
func getLastRuntimeError(r *runsc.Runsc) (string, error) {
if r.Log == "" {
return "", nil
}
f, err := os.OpenFile(r.Log, os.O_RDONLY, 0400)
if err != nil {
return "", err
}
var (
errMsg string
log struct {
Level string
Msg string
Time time.Time
}
)
dec := json.NewDecoder(f)
for err = nil; err == nil; {
if err = dec.Decode(&log); err != nil && err != io.EOF {
return "", err
}
if log.Level == "error" {
errMsg = strings.TrimSpace(log.Msg)
}
}
return errMsg, nil
}
func copyFile(to, from string) error {
ff, err := os.Open(from)
if err != nil {
return err
}
defer ff.Close()
tt, err := os.Create(to)
if err != nil {
return err
}
defer tt.Close()
p := bufPool.Get().(*[]byte)
defer bufPool.Put(p)
_, err = io.CopyBuffer(tt, ff, *p)
return err
}
func hasNoIO(r *CreateConfig) bool {
return r.Stdin == "" && r.Stdout == "" && r.Stderr == ""
}
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