Add --no-warn.

src/xz/args.c

@@ -46,7 +46,8 @@ parse_real(args_info *args, int argc, char **argv)
 		OPT_FILES0,
 	};
 
-	static const char short_opts[] = "cC:defF:hHlkM:qrS:tT:vVz0123456789";
+	static const char short_opts[]
+			= "cC:defF:hHlkM:qQrS:tT:vVz0123456789";
 
 	static const struct option long_opts[] = {
 		// Operation mode
@@ -94,6 +95,7 @@ parse_real(args_info *args, int argc, char **argv)
 		// Other options
 		{ "quiet",          no_argument,       NULL,  'q' },
 		{ "verbose",        no_argument,       NULL,  'v' },
+		{ "no-warn",        no_argument,       NULL,  'Q' },
 		{ "help",           no_argument,       NULL,  'h' },
 		{ "long-help",      no_argument,       NULL,  'H' },
 		{ "version",        no_argument,       NULL,  'V' },
@@ -195,6 +197,10 @@ parse_real(args_info *args, int argc, char **argv)
 			message_verbosity_decrease();
 			break;
 
+		case 'Q':
+			set_exit_no_warn();
+			break;
+
 		case 't':
 			opt_mode = MODE_TEST;
 			break;

src/xz/main.c

@@ -17,6 +17,10 @@
 /// Exit status to use. This can be changed with set_exit_status().
 static enum exit_status_type exit_status = E_SUCCESS;
 
+/// True if --no-warn is specified. When this is true, we don't set
+/// the exit status to E_WARNING when something worth a warning happens.
+static bool no_warn = false;
+
 
 extern void
 set_exit_status(enum exit_status_type new_status)
@@ -30,6 +34,14 @@ set_exit_status(enum exit_status_type new_status)
 }
 
 
+extern void
+set_exit_no_warn(void)
+{
+	no_warn = true;
+	return;
+}
+
+
 extern void
 my_exit(enum exit_status_type status)
 {
@@ -59,6 +71,11 @@ my_exit(enum exit_status_type status)
 			status = E_ERROR;
 	}
 
+	// Suppress the exit status indicating a warning if --no-warn
+	// was specified.
+	if (status == E_WARNING && no_warn)
+		status = E_SUCCESS;
+
 	// If we have got a signal, raise it to kill the program.
 	// Otherwise we just call exit().
 	signals_exit();

src/xz/main.h

@@ -24,6 +24,12 @@ enum exit_status_type {
 extern void set_exit_status(enum exit_status_type new_status);
 
 
+/// Use E_SUCCESS instead of E_WARNING if something worth a warning occurs
+/// but nothing worth an error has occurred. This is called when --no-warn
+/// is specified.
+extern void set_exit_no_warn(void);
+
+
 /// Exits the program using the given status. This takes care of closing
 /// stdin, stdout, and stderr and catches possible errors. If we had got
 /// a signal, this function will raise it so that to the parent process it

src/xz/message.c

@@ -1133,6 +1133,10 @@ message_help(bool long_help)
 "  -q, --quiet         suppress warnings; specify twice to suppress errors too\n"
 "  -v, --verbose       be verbose; specify twice for even more verbose"));
 
+	if (long_help)
+		puts(_(
+"  -Q, --no-warn       make warnings not affect the exit status"));
+
 	if (long_help)
 		puts(_(
 "\n"