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// Copyright 2018 The containerd Authors.
// 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 proc
import (
"encoding/json"
"io"
"os"
"strings"
"time"
"gvisor.dev/gvisor/pkg/shim/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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