73 lines
2.0 KiB
Go
73 lines
2.0 KiB
Go
// Copyright 2019 The gVisor Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package cmd
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import (
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"encoding/json"
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"fmt"
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"io"
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"os"
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"time"
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"github.com/google/subcommands"
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"gvisor.dev/gvisor/pkg/log"
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)
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// ErrorLogger is where error messages should be written to. These messages are
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// consumed by containerd and show up to users of command line tools,
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// like docker/kubectl.
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var ErrorLogger io.Writer
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type jsonError struct {
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Msg string `json:"msg"`
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Level string `json:"level"`
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Time time.Time `json:"time"`
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}
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// Errorf logs error to containerd log (--log), to stderr, and debug logs. It
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// returns subcommands.ExitFailure for convenience with subcommand.Execute()
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// methods:
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// return Errorf("Danger! Danger!")
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//
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func Errorf(format string, args ...interface{}) subcommands.ExitStatus {
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// If runsc is being invoked by docker or cri-o, then we might not have
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// access to stderr, so we log a serious-looking warning in addition to
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// writing to stderr.
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log.Warningf("FATAL ERROR: "+format, args...)
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fmt.Fprintf(os.Stderr, format+"\n", args...)
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j := jsonError{
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Msg: fmt.Sprintf(format, args...),
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Level: "error",
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Time: time.Now(),
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}
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b, err := json.Marshal(j)
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if err != nil {
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panic(err)
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}
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if ErrorLogger != nil {
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ErrorLogger.Write(b)
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}
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return subcommands.ExitFailure
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}
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// Fatalf logs the same way as Errorf() does, plus *exits* the process.
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func Fatalf(format string, args ...interface{}) {
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Errorf(format, args...)
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// Return an error that is unlikely to be used by the application.
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os.Exit(128)
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}
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