mirror of
https://github.com/k3s-io/k3s.git
synced 2024-06-07 19:41:36 +00:00
110 lines
2.2 KiB
Go
110 lines
2.2 KiB
Go
package cmds
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import (
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"flag"
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"fmt"
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"io"
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"os"
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"strconv"
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"sync"
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"time"
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"github.com/docker/docker/pkg/reexec"
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"github.com/natefinch/lumberjack"
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"github.com/rancher/k3s/pkg/version"
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"github.com/urfave/cli"
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)
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type Log struct {
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VLevel int
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VModule string
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LogFile string
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AlsoLogToStderr bool
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}
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var (
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LogConfig Log
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VLevel = cli.IntFlag{
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Name: "v",
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Usage: "(logging) Number for the log level verbosity",
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Destination: &LogConfig.VLevel,
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}
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VModule = cli.StringFlag{
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Name: "vmodule",
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Usage: "(logging) Comma-separated list of pattern=N settings for file-filtered logging",
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Destination: &LogConfig.VModule,
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}
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LogFile = cli.StringFlag{
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Name: "log,l",
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Usage: "(logging) Log to file",
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Destination: &LogConfig.LogFile,
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}
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AlsoLogToStderr = cli.BoolFlag{
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Name: "alsologtostderr",
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Usage: "(logging) Log to standard error as well as file (if set)",
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Destination: &LogConfig.AlsoLogToStderr,
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}
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logSetupOnce sync.Once
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)
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func InitLogging() error {
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var rErr error
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logSetupOnce.Do(func() {
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if LogConfig.LogFile != "" && os.Getenv("_K3S_LOG_REEXEC_") == "" {
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rErr = runWithLogging()
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return
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}
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if err := checkUnixTimestamp(); err != nil {
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rErr = err
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return
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}
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setupLogging()
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})
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return rErr
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}
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func checkUnixTimestamp() error {
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timeNow := time.Now()
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// check if time before 01/01/1980
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if timeNow.Before(time.Unix(315532800, 0)) {
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return fmt.Errorf("server time isn't set properly: %v", timeNow)
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}
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return nil
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}
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func runWithLogging() error {
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var (
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l io.Writer
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)
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l = &lumberjack.Logger{
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Filename: LogConfig.LogFile,
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MaxSize: 50,
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MaxBackups: 3,
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MaxAge: 28,
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Compress: true,
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}
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if LogConfig.AlsoLogToStderr {
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l = io.MultiWriter(l, os.Stderr)
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}
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args := append([]string{version.Program}, os.Args[1:]...)
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cmd := reexec.Command(args...)
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cmd.Env = os.Environ()
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cmd.Env = append(cmd.Env, "_K3S_LOG_REEXEC_=true")
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cmd.Stderr = l
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cmd.Stdout = l
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cmd.Stdin = os.Stdin
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return cmd.Run()
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}
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func setupLogging() {
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flag.Set("v", strconv.Itoa(LogConfig.VLevel))
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flag.Set("vmodule", LogConfig.VModule)
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flag.Set("alsologtostderr", strconv.FormatBool(Debug))
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flag.Set("logtostderr", strconv.FormatBool(!Debug))
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}
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