cli: hush: Adjust 'run' command to run each line of the env var

The run command treats each argument an an environment variable. It gets the
value of each variable and executes it as a command. If an environment
variable contains a newline and the hush cli is used, it is supposed to
execute each line one after the other.

Normally a newline signals to hush to exit - this is used in normal command
line entry - after a command is entered we want to return to allow the user
to enter the next one. But environment variables obviously need to execute
to completion.

Add a special case for the execution of environment variables which
continues when a newline is seen, and add a few tests to check this
behaviour.

Note: it's not impossible that this may cause regressions in other areas.
I can't think of a case but with any change of behaviour with limited test
coverage there is always a risk. From what I can tell this behaviour has
been around since at least U-Boot 2011.03, although this pre-dates sandbox
and I have not tested it on real hardware.

Reported-by: Wolfgang Denk <wd@denx.de>
Signed-off-by: Simon Glass <sjg@chromium.org>

common/cli.c

@@ -36,8 +36,11 @@ int run_command(const char *cmd, int flag)
 
 	return 0;
 #else
-	return parse_string_outer(cmd,
-			FLAG_PARSE_SEMICOLON | FLAG_EXIT_FROM_LOOP);
+	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);
 #endif
 }
 
@@ -125,7 +128,7 @@ int do_run(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 			return 1;
 		}
 
-		if (run_command(arg, flag) != 0)
+		if (run_command(arg, flag | CMD_FLAG_ENV) != 0)
 			return 1;
 	}
 	return 0;

common/cli_hush.c

@@ -3170,7 +3170,8 @@ static int parse_stream_outer(struct in_str *inp, int flag)
 		update_ifs_map();
 		if (!(flag & FLAG_PARSE_SEMICOLON) || (flag & FLAG_REPARSING)) mapset((uchar *)";$&|", 0);
 		inp->promptmode=1;
-		rcode = parse_stream(&temp, &ctx, inp, '\n');
+		rcode = parse_stream(&temp, &ctx, inp,
+				     flag & FLAG_CONT_ON_NEWLINE ? -1 : '\n');
 #ifdef __U_BOOT__
 		if (rcode == 1) flag_repeat = 0;
 #endif

include/cli_hush.h

@@ -11,6 +11,7 @@
 #define FLAG_EXIT_FROM_LOOP 1
 #define FLAG_PARSE_SEMICOLON (1 << 1)	  /* symbol ';' is special for parser */
 #define FLAG_REPARSING       (1 << 2)	  /* >=2nd pass */
+#define FLAG_CONT_ON_NEWLINE (1 << 3)	  /* continue when we see \n */
 
 extern int u_boot_hush_start(void);
 extern int parse_string_outer(const char *, int);

include/command.h

@@ -147,6 +147,7 @@ int cmd_process(int flag, int argc, char * const argv[],
  */
 #define CMD_FLAG_REPEAT		0x0001	/* repeat last command		*/
 #define CMD_FLAG_BOOTD		0x0002	/* command is from bootd	*/
+#define CMD_FLAG_ENV		0x0004	/* command is from the environment */
 
 #ifdef CONFIG_AUTO_COMPLETE
 # define _CMD_COMPLETE(x) x,

test/command_ut.c

@@ -66,7 +66,21 @@ static int do_ut_cmd(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 	assert(run_command_list("false", -1, 0) == 1);
 	assert(run_command_list("echo", -1, 0) == 0);
 
+	run_command("setenv foo 'setenv monty 1; setenv python 2'", 0);
+	run_command("run foo", 0);
+	assert(getenv("monty") != NULL);
+	assert(!strcmp("1", getenv("monty")));
+	assert(getenv("python") != NULL);
+	assert(!strcmp("2", getenv("python")));
+
 #ifdef CONFIG_SYS_HUSH_PARSER
+	run_command("setenv foo 'setenv black 1\nsetenv adder 2'", 0);
+	run_command("run foo", 0);
+	assert(getenv("black") != NULL);
+	assert(!strcmp("1", getenv("black")));
+	assert(getenv("adder") != NULL);
+	assert(!strcmp("2", getenv("adder")));
+
 	/* Test the 'test' command */
 
 #define HUSH_TEST(name, expr, expected_result) \