Merge pull request u-root#124 from systemboot/interactive

uinit: Add interactive mode

uinit/main.go

@@ -5,15 +5,17 @@ import (
 	"log"
 	"os"
 	"os/exec"
+	"os/signal"
 	"time"
 
 	"github.com/systemboot/systemboot/pkg/booter"
 )
 
 var (
-	doQuiet       = flag.Bool("q", false, "Disable verbose output")
-	interval      = flag.Int("I", 1, "Interval in seconds before looping to the next boot command")
-	noDefaultBoot = flag.Bool("nodefault", false, "Do not attempt default boot entries if regular ones fail")
+	allowInteractive = flag.Bool("i", true, "Allow user to interrupt boot process and run commands")
+	doQuiet          = flag.Bool("q", false, "Disable verbose output")
+	interval         = flag.Int("I", 1, "Interval in seconds before looping to the next boot command")
+	noDefaultBoot    = flag.Bool("nodefault", false, "Do not attempt default boot entries if regular ones fail")
 )
 
 var defaultBootsequence = [][]string{
@@ -32,13 +34,18 @@ func main() {
                     |____/ \__, |___/\__\___|_| |_| |_|_.__/ \___/ \___/ \__|
                            |___/
 `)
-	log.Printf("**************************************************************************")
-	log.Print("Starting boot sequence, press CTRL-C within 5 seconds to drop into a shell")
-	log.Printf("**************************************************************************")
-	time.Sleep(5 * time.Second)
 
 	sleepInterval := time.Duration(*interval) * time.Second
 
+	if *allowInteractive {
+		log.Printf("**************************************************************************")
+		log.Print("Starting boot sequence, press CTRL-C within 5 seconds to drop into a shell")
+		log.Printf("**************************************************************************")
+		time.Sleep(5 * time.Second)
+	} else {
+		signal.Ignore()
+	}
+
 	// Get and show boot entries
 	bootEntries := booter.GetBootEntries()
 	log.Printf("BOOT ENTRIES:")