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// Copyright 2019 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
//
// 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.
package cmd
import (
"encoding/json"
"fmt"
"io"
"os"
"time"
"github.com/google/subcommands"
"gvisor.dev/gvisor/pkg/log"
)
// ErrorLogger is where error messages should be written to. These messages are
// consumed by containerd and show up to users of command line tools,
// like docker/kubectl.
var ErrorLogger io.Writer
type jsonError struct {
Msg string `json:"msg"`
Level string `json:"level"`
Time time.Time `json:"time"`
}
// Errorf logs error to containerd log (--log), to stderr, and debug logs. It
// returns subcommands.ExitFailure for convenience with subcommand.Execute()
// methods:
// return Errorf("Danger! Danger!")
//
func Errorf(format string, args ...interface{}) subcommands.ExitStatus {
// If runsc is being invoked by docker or cri-o, then we might not have
// access to stderr, so we log a serious-looking warning in addition to
// writing to stderr.
log.Warningf("FATAL ERROR: "+format, args...)
fmt.Fprintf(os.Stderr, format+"\n", args...)
j := jsonError{
Msg: fmt.Sprintf(format, args...),
Level: "error",
Time: time.Now(),
}
b, err := json.Marshal(j)
if err != nil {
panic(err)
}
if ErrorLogger != nil {
ErrorLogger.Write(b)
}
return subcommands.ExitFailure
}
// Fatalf logs the same way as Errorf() does, plus *exits* the process.
func Fatalf(format string, args ...interface{}) {
Errorf(format, args...)
// Return an error that is unlikely to be used by the application.
os.Exit(128)
}
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