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main_daemon.go
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/
main_daemon.go
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package main
import (
"fmt"
"os"
"os/exec"
"os/signal"
"runtime/pprof"
"sync"
"syscall"
"time"
"github.com/lxc/lxd/shared"
"github.com/lxc/lxd/shared/logger"
)
func cmdDaemon() error {
// Only root should run this
if os.Geteuid() != 0 {
return fmt.Errorf("This must be run as root")
}
if *argCPUProfile != "" {
f, err := os.Create(*argCPUProfile)
if err != nil {
fmt.Printf("Error opening cpu profile file: %s\n", err)
return nil
}
pprof.StartCPUProfile(f)
defer pprof.StopCPUProfile()
}
if *argMemProfile != "" {
go memProfiler(*argMemProfile)
}
neededPrograms := []string{"dnsmasq", "setfacl", "rsync", "tar", "unsquashfs", "xz"}
for _, p := range neededPrograms {
_, err := exec.LookPath(p)
if err != nil {
return err
}
}
if *argPrintGoroutinesEvery > 0 {
go func() {
for {
time.Sleep(time.Duration(*argPrintGoroutinesEvery) * time.Second)
logger.Debugf(logger.GetStack())
}
}()
}
d := &Daemon{
group: *argGroup,
SetupMode: shared.PathExists(shared.VarPath(".setup_mode"))}
err := d.Init()
if err != nil {
if d != nil && d.db != nil {
d.db.Close()
}
return err
}
var ret error
var wg sync.WaitGroup
wg.Add(1)
go func() {
ch := make(chan os.Signal)
signal.Notify(ch, syscall.SIGPWR)
sig := <-ch
logger.Infof("Received '%s signal', shutting down containers.", sig)
containersShutdown(d)
ret = d.Stop()
wg.Done()
}()
go func() {
<-d.shutdownChan
logger.Infof("Asked to shutdown by API, shutting down containers.")
containersShutdown(d)
ret = d.Stop()
wg.Done()
}()
go func() {
ch := make(chan os.Signal)
signal.Notify(ch, syscall.SIGINT)
signal.Notify(ch, syscall.SIGQUIT)
signal.Notify(ch, syscall.SIGTERM)
sig := <-ch
logger.Infof("Received '%s signal', exiting.", sig)
ret = d.Stop()
wg.Done()
}()
wg.Wait()
return ret
}