Allow "imgexec" with no arguments to boot the file that was loaded with

"kernel".

src/hci/commands/image_cmd.c

@@ -304,7 +304,7 @@ static int imgexec_exec ( int argc, char **argv ) {
 		{ NULL, 0, NULL, 0 },
 	};
 	struct image *image;
-	const char *name;
+	const char *name = NULL;
 	int c;
 	int rc;
 
@@ -320,19 +320,29 @@ static int imgexec_exec ( int argc, char **argv ) {
 		}
 	}
 
-	/* Need exactly one image name */
-	if ( optind != ( argc - 1 ) ) {
+	/* Need no more than one image name */
+	if ( optind != argc )
+		name = argv[optind++];
+	if ( optind != argc ) {
 		imgexec_syntax ( argv );
 		return 1;
 	}
-	name = argv[optind];
 	
 	/* Execute specified image */
-	image = find_image ( name );
-	if ( ! image ) {
-		printf ( "No such image: %s\n", name );
-		return 1;
+	if ( name ) {
+		image = find_image ( name );
+		if ( ! image ) {
+			printf ( "No such image: %s\n", name );
+			return 1;
+		}
+	} else {
+		image = imgautoselect();
+		if ( ! image ) {
+			printf ( "No loaded images\n" );
+			return 1;
+		}
 	}
+
 	if ( ( rc = imgexec ( image ) ) != 0 ) {
 		printf ( "Could not execute %s: %s\n", name, strerror ( rc ) );
 		return 1;
@@ -448,7 +458,6 @@ static int imgfree_exec ( int argc, char **argv ) {
 	return 0;
 }
 
-
 /** Image management commands */
 struct command image_commands[] __command = {
 	{

src/include/usr/imgmgmt.h

@@ -11,6 +11,7 @@ extern int imgfetch ( const char *filename, const char *name,
 		      struct image **new_image );
 extern int imgload ( struct image *image );
 extern int imgexec ( struct image *image );
+extern struct image * imgautoselect ( void );
 extern void imgstat ( struct image *image );
 extern void imgfree ( struct image *image );
 

src/usr/imgmgmt.c

@@ -90,6 +90,22 @@ int imgexec ( struct image *image ) {
 	return image_exec ( image );
 }
 
+/**
+ * Identify the first loaded image
+ *
+ * @ret image		Image, or NULL
+ */
+struct image * imgautoselect ( void ) {
+	struct image *image;
+
+	for_each_image ( image ) {
+		if ( image->flags & IMAGE_LOADED )
+			return image;
+	}
+
+	return NULL;
+}
+
 /**
  * Display status of an image
  *