cli: add modern hush as parser for run_command*()

Enables using, in code, modern hush as parser for run_command function family.
It also enables the command run to be used by CLI user of modern hush.

Reviewed-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Francis Laniel <francis.laniel@amarulasolutions.com>

common/cli.c

@@ -25,6 +25,14 @@
 #include <linux/errno.h>
 
 #ifdef CONFIG_CMDLINE
+
+static inline bool use_hush_old(void)
+{
+	return IS_ENABLED(CONFIG_HUSH_SELECTABLE) ?
+	gd->flags & GD_FLG_HUSH_OLD_PARSER :
+	IS_ENABLED(CONFIG_HUSH_OLD_PARSER);
+}
+
 /*
  * Run a command using the selected parser.
  *
@@ -43,15 +51,30 @@ int run_command(const char *cmd, int flag)
 		return 1;
 
 	return 0;
-#elif CONFIG_IS_ENABLED(HUSH_OLD_PARSER)
+#else
+	if (use_hush_old()) {
 		int hush_flags = FLAG_PARSE_SEMICOLON | FLAG_EXIT_FROM_LOOP;
 
 		if (flag & CMD_FLAG_ENV)
 			hush_flags |= FLAG_CONT_ON_NEWLINE;
 		return parse_string_outer(cmd, hush_flags);
-#else /* HUSH_MODERN_PARSER */
+	}
-	/* Not yet implemented. */
+	/*
-	return 1;
+	 * Possible values for flags are the following:
+	 * FLAG_EXIT_FROM_LOOP: This flags ensures we exit from loop in
+	 * parse_and_run_stream() after first iteration while normal
+	 * behavior, * i.e. when called from cli_loop(), is to loop
+	 * infinitely.
+	 * FLAG_PARSE_SEMICOLON: modern Hush parses ';' and does not stop
+	 * first time it sees one. So, I think we do not need this flag.
+	 * FLAG_REPARSING: For the moment, I do not understand the goal
+	 * of this flag.
+	 * FLAG_CONT_ON_NEWLINE: This flag seems to be used to continue
+	 * parsing even when reading '\n' when coming from
+	 * run_command(). In this case, modern Hush reads until it finds
+	 * '\0'. So, I think we do not need this flag.
+	 */
+	return parse_string_outer_modern(cmd, FLAG_EXIT_FROM_LOOP);
 #endif
 }
 
@@ -67,12 +90,23 @@ int run_command_repeatable(const char *cmd, int flag)
 #ifndef CONFIG_HUSH_PARSER
 	return cli_simple_run_command(cmd, flag);
 #else
+	int ret;
+
+	if (use_hush_old()) {
+		ret = parse_string_outer(cmd,
+					 FLAG_PARSE_SEMICOLON
+					 | FLAG_EXIT_FROM_LOOP);
+	} else {
+		ret = parse_string_outer_modern(cmd,
+					      FLAG_PARSE_SEMICOLON
+					      | FLAG_EXIT_FROM_LOOP);
+	}
+
 	/*
 	 * parse_string_outer() returns 1 for failure, so clean up
 	 * its result.
 	 */
-	if (parse_string_outer(cmd,
+	if (ret)
-			       FLAG_PARSE_SEMICOLON | FLAG_EXIT_FROM_LOOP))
 		return -1;
 
 	return 0;
@@ -111,12 +145,11 @@ int run_command_list(const char *cmd, int len, int flag)
 		buff[len] = '\0';
 	}
 #ifdef CONFIG_HUSH_PARSER
-#if CONFIG_IS_ENABLED(HUSH_OLD_PARSER)
+	if (use_hush_old()) {
 		rcode = parse_string_outer(buff, FLAG_PARSE_SEMICOLON);
-#else /* HUSH_MODERN_PARSER */
+	} else {
-	/* Not yet implemented. */
+		rcode = parse_string_outer_modern(buff, FLAG_PARSE_SEMICOLON);
-	rcode = 1;
+	}
-#endif
 #else
 	/*
 	 * This function will overwrite any \n it sees with a \0, which

common/cli_hush_upstream.c

@@ -8022,7 +8022,7 @@ static int parse_and_run_string(const char *s)
 }
 
 #ifdef __U_BOOT__
-int parse_string_outer(const char *cmd, int flags)
+int parse_string_outer_modern(const char *cmd, int flags)
 {
 	int ret;
 	int old_flags;

test/boot/bootflow.c

@@ -710,7 +710,21 @@ static int bootflow_scan_menu_boot(struct unit_test_state *uts)
 	ut_assert_skip_to_line("(2 bootflows, 2 valid)");
 
 	ut_assert_nextline("Selected: Armbian");
+
+	if (gd->flags & GD_FLG_HUSH_OLD_PARSER) {
+		/*
+		 * With old hush, despite booti failing to boot, i.e. returning
+		 * CMD_RET_FAILURE, run_command() returns 0 which leads bootflow_boot(), as
+		 * we are using bootmeth_script here, to return -EFAULT.
+		 */
 		ut_assert_skip_to_line("Boot failed (err=-14)");
+	} else if (gd->flags & GD_FLG_HUSH_MODERN_PARSER) {
+		/*
+		 * While with modern one, run_command() propagates CMD_RET_FAILURE returned
+		 * by booti, so we get 1 here.
+		 */
+		ut_assert_skip_to_line("Boot failed (err=1)");
+	}
 	ut_assertnonnull(std->cur_bootflow);
 	ut_assert_console_end();