Switch to syslog when running in the background

daemonize.go

@@ -2,10 +2,14 @@ package main
 
 import (
 	"fmt"
+	"log"
+	"log/syslog"
 	"os"
 	"os/exec"
 	"os/signal"
 	"syscall"
+
+	"github.com/rfjakob/gocryptfs/cryptfs"
 )
 
 // The child sends us USR1 if the mount was successful
@@ -22,8 +26,7 @@ func exitOnUsr1() {
 func forkChild() {
 	go exitOnUsr1()
 	name := os.Args[0]
-	notifyArg := fmt.Sprintf("-notifypid=%d", os.Getpid())
-	newArgs := []string{"-f", notifyArg}
+	newArgs := []string{"-f", fmt.Sprintf("-notifypid=%d", os.Getpid())}
 	newArgs = append(newArgs, os.Args[1:]...)
 	c := exec.Command(name, newArgs...)
 	c.Stdout = os.Stdout
@@ -47,3 +50,13 @@ func forkChild() {
 	// The child exited with 0 - let's do the same.
 	os.Exit(0)
 }
+
+// Switch one Logger to syslog
+func switchToSyslog(l *log.Logger, p syslog.Priority) {
+	w, err := syslog.New(p, PROGRAM_NAME)
+	if err != nil {
+		cryptfs.Warn.Printf("Cannot switch 0x%02x to syslog: %v", p, err)
+	} else {
+		l.SetOutput(w)
+	}
+}

main.go

@@ -5,6 +5,7 @@ import (
 	"flag"
 	"fmt"
 	"io/ioutil"
+	"log/syslog"
 	"os"
 	"os/exec"
 	"os/signal"
@@ -276,9 +277,17 @@ func main() {
 	cryptfs.Debug.Printf("cli args: %v", args)
 	srv := pathfsFrontend(masterkey, args, confFile)
 	cryptfs.Info.Println(colorGreen + "Filesystem mounted and ready." + colorReset)
-	// We are ready - send USR1 signal to our parent
+	// We are ready - send USR1 signal to our parent and switch to syslog
 	if args.notifypid > 0 {
 		sendUsr1(args.notifypid)
+
+		if !args.quiet {
+			switchToSyslog(cryptfs.Info, syslog.LOG_USER|syslog.LOG_INFO)
+		}
+		if args.debug {
+			switchToSyslog(cryptfs.Debug, syslog.LOG_USER|syslog.LOG_DEBUG)
+		}
+		switchToSyslog(cryptfs.Warn, syslog.LOG_USER|syslog.LOG_WARNING)
 	}
 	// Wait for SIGINT in the background and unmount ourselves if we get it.
 	// This prevents a dangling "Transport endpoint is not connected" mountpoint.