mirror of
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78 lines
1.7 KiB
Go
78 lines
1.7 KiB
Go
// +build !windows
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/*
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Copyright The containerd Authors.
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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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http://www.apache.org/licenses/LICENSE-2.0
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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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*/
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package logging
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import (
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"context"
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"fmt"
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"io"
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"os"
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"os/signal"
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"golang.org/x/sys/unix"
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)
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// Config of the container logs
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type Config struct {
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ID string
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Namespace string
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Stdout io.Reader
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Stderr io.Reader
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}
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// LoggerFunc is implemented by custom v2 logging binaries
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type LoggerFunc func(context.Context, *Config, func() error) error
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// Run the logging driver
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func Run(fn LoggerFunc) {
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ctx, cancel := context.WithCancel(context.Background())
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config := &Config{
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ID: os.Getenv("CONTAINER_ID"),
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Namespace: os.Getenv("CONTAINER_NAMESPACE"),
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Stdout: os.NewFile(3, "CONTAINER_STDOUT"),
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Stderr: os.NewFile(4, "CONTAINER_STDERR"),
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}
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var (
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s = make(chan os.Signal, 32)
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errCh = make(chan error, 1)
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wait = os.NewFile(5, "CONTAINER_WAIT")
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)
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signal.Notify(s, unix.SIGTERM)
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go func() {
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if err := fn(ctx, config, wait.Close); err != nil {
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errCh <- err
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}
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errCh <- nil
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}()
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for {
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select {
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case <-s:
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cancel()
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case err := <-errCh:
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if err != nil {
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fmt.Fprintln(os.Stderr, err)
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os.Exit(1)
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}
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os.Exit(0)
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}
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}
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}
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