k3s/pkg/cli/cmds/log.go

101 lines
2.0 KiB
Go

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