[usr] Offer user a second chance to enter the shell on boot failure

src/core/main.c

 
 **************************************************************************/
 
+#include <stdio.h>
 #include <gpxe/init.h>
+#include <gpxe/features.h>
 #include <gpxe/shell.h>
 #include <gpxe/shell_banner.h>
 #include <usr/autoboot.h>
 
+#define NORMAL	"\033[0m"
+#define BOLD	"\033[1m"
+#define CYAN	"\033[36m"
+
+static struct feature features[0] __table_start ( struct feature, features );
+static struct feature features_end[0] __table_end ( struct feature, features );
+
 /**
  * Main entry point
  *
  * @ret rc		Return status code
  */
 __cdecl int main ( void ) {
+	struct feature *feature;
 
 	initialise();
 	startup();
 
-	if ( shell_banner() )
+	/* Print welcome banner */
+	printf ( NORMAL "\n\n\n" BOLD "gPXE " VERSION
+		 NORMAL " -- Open Source Boot Firmware -- "
+		 CYAN "http://etherboot.org" NORMAL "\n"
+		 "Features:" );
+	for ( feature = features ; feature < features_end ; feature++ )
+		printf ( " %s", feature->name );
+	printf ( "\n" );
+
+	/* Prompt for shell */
+	if ( shell_banner() ) {
+		/* User wants shell; just give them a shell */
 		shell();
-	else
+	} else {
+		/* User doesn't want shell; try booting.  If booting
+		 * fails, offer a second chance to enter the shell for
+		 * diagnostics.
+		 */
 		autoboot();
-	
+		if ( shell_banner() )
+			shell();
+	}
+
 	shutdown();
 
 	return 0;

src/hci/shell_banner.c

 
 #include <stdio.h>
 #include <console.h>
-#include <gpxe/features.h>
 #include <gpxe/timer.h>
 #include <gpxe/shell_banner.h>
 
 
 #define BANNER_TIMEOUT ( 2 * TICKS_PER_SEC )
 
-#define NORMAL	"\033[0m"
-#define BOLD	"\033[1m"
-#define CYAN	"\033[36m"
-
-static struct feature features[0] __table_start ( struct feature, features );
-static struct feature features_end[0] __table_end ( struct feature, features );
-
 /**
  * Print shell banner and prompt for shell entry
  *
  */
 int shell_banner ( void ) {
 	unsigned long timeout = ( currticks() + BANNER_TIMEOUT );
-	struct feature *feature;
-	int key;
 	int enter_shell = 0;
+	int key;
 
-	/* Print welcome banner */
-	printf ( NORMAL "\n\n\n" BOLD "gPXE " VERSION
-		 NORMAL " -- Open Source Boot Firmware -- "
-		 CYAN "http://etherboot.org" NORMAL "\n"
-		 "Features:" );
-	for ( feature = features ; feature < features_end ; feature++ ) {
-		printf ( " %s", feature->name );
-	}
 	printf ( "\nPress Ctrl-B for the gPXE command line..." );
 
 	/* Wait for key */