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main.go
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main.go
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package main
import (
"flag"
"os"
"os/signal"
"syscall"
"github.com/golang/glog"
"github.com/jetstack/cert-manager/pkg/logs"
)
func main() {
logs.InitLogs()
defer logs.FlushLogs()
stopCh := SetupSignalHandler()
cmd := NewCommandStartController(stopCh)
cmd.Flags().AddGoFlagSet(flag.CommandLine)
flag.CommandLine.Parse([]string{})
if err := cmd.Execute(); err != nil {
glog.Fatal(err)
}
}
var shutdownSignals = []os.Signal{os.Interrupt, syscall.SIGTERM}
var onlyOneSignalHandler = make(chan struct{})
// SetupSignalHandler registered for SIGTERM and SIGINT. A stop channel is returned
// which is closed on one of these signals. If a second signal is caught, the program
// is terminated with exit code 1.
func SetupSignalHandler() (stopCh <-chan struct{}) {
close(onlyOneSignalHandler) // panics when called twice
stop := make(chan struct{})
c := make(chan os.Signal, 2)
signal.Notify(c, shutdownSignals...)
go func() {
<-c
close(stop)
<-c
os.Exit(1) // second signal. Exit directly.
}()
return stop
}