Daemon updates, backgrounding, and CLI integration

internal/app/wwctl/server/start/main.go

@@ -7,5 +7,5 @@ import (
 
 func CobraRunE(cmd *cobra.Command, args []string) error {
 
-	return warewulfd.RunServer()
+	return warewulfd.DaemonStart()
 }

internal/app/wwctl/server/status/main.go

@@ -1,12 +1,11 @@
 package status
 
 import (
-	"fmt"
+	"github.com/hpcng/warewulf/internal/pkg/warewulfd"
 	"github.com/spf13/cobra"
 )
 
 func CobraRunE(cmd *cobra.Command, args []string) error {
-	fmt.Printf("Not implemented yet\n")
-
+	warewulfd.DaemonStatus()
 	return nil
 }

internal/app/wwctl/server/stop/main.go

@@ -1,11 +1,11 @@
 package stop
 
 import (
-	"fmt"
+	"github.com/hpcng/warewulf/internal/pkg/warewulfd"
 	"github.com/spf13/cobra"
 )
 
 func CobraRunE(cmd *cobra.Command, args []string) error {
-	fmt.Printf("Not implemented yet\n")
+	warewulfd.DaemonStop()
 	return nil
 }

internal/pkg/warewulfd/daemon.go

@@ -0,0 +1,113 @@
+package warewulfd
+
+import (
+	"fmt"
+	"github.com/hpcng/warewulf/internal/pkg/util"
+	"github.com/hpcng/warewulf/internal/pkg/wwlog"
+	"io/ioutil"
+	"os"
+	"os/exec"
+	"strconv"
+	"syscall"
+	"time"
+)
+
+const (
+	WAREWULFD_PIDFILE = "/tmp/warewulfd.pid"
+	WAREWULFD_LOGFILE = "/tmp/warewulfd.log"
+)
+
+func DaemonStart() error {
+
+	if os.Getenv("WAREWULFD_BACKGROUND") == "1" {
+		RunServer()
+
+	} else {
+		os.Setenv("WAREWULFD_BACKGROUND", "1")
+
+		f, err := os.OpenFile(WAREWULFD_LOGFILE, os.O_RDWR|os.O_CREATE|os.O_APPEND, 0644)
+		if err != nil {
+			return err
+		}
+
+		p, err := os.OpenFile(WAREWULFD_PIDFILE, os.O_RDWR|os.O_CREATE|os.O_TRUNC, 0644)
+		if err != nil {
+			return err
+		}
+
+		cmd := exec.Command(os.Args[0], "server", "start")
+		cmd.Stdout = f
+		cmd.Stderr = f
+		cmd.Start()
+		pid := cmd.Process.Pid
+
+		p.WriteString(fmt.Sprintf("%d", pid))
+		p.Close()
+
+		time.Sleep(1 * time.Second)
+
+		DaemonStatus()
+	}
+
+	return nil
+}
+
+func DaemonStatus() error {
+
+	if util.IsFile(WAREWULFD_PIDFILE) == false {
+		wwlog.Printf(wwlog.INFO, "Warewulf daemon process not running (%s)\n", WAREWULFD_PIDFILE)
+		return nil
+	}
+
+	dat, err := ioutil.ReadFile(WAREWULFD_PIDFILE)
+	if err != nil {
+		return err
+	}
+
+	pid, _ := strconv.Atoi(string(dat))
+	process, err := os.FindProcess(pid)
+	if err != nil {
+		fmt.Printf("Failed to find process: %s\n", err)
+		return err
+	} else {
+		err := process.Signal(syscall.Signal(0))
+		if err != nil {
+			fmt.Printf("SIGCONT on pid %d returned: %v\n", pid, err)
+			return err
+		} else {
+			fmt.Printf("Warewulf daemon is running at PID: %d\n", pid)
+		}
+	}
+
+	return nil
+}
+
+func DaemonStop() error {
+
+	if util.IsFile(WAREWULFD_PIDFILE) == false {
+		wwlog.Printf(wwlog.INFO, "Warewulf daemon process not running (%s)\n", WAREWULFD_PIDFILE)
+		return nil
+	}
+
+	dat, err := ioutil.ReadFile(WAREWULFD_PIDFILE)
+	if err != nil {
+		return err
+	}
+
+	pid, _ := strconv.Atoi(string(dat))
+	process, err := os.FindProcess(pid)
+	if err != nil {
+		fmt.Printf("Failed to find process: %s\n", err)
+	} else {
+		err := process.Signal(syscall.Signal(15))
+		if err != nil {
+			fmt.Printf("SIGCONT on pid %d returned: %v\n", pid, err)
+		} else {
+			fmt.Printf("Terminated Warewulf process at PID: %d\n", pid)
+		}
+	}
+
+	os.Remove(WAREWULFD_PIDFILE)
+
+	return nil
+}