[PATCH v2 4/4] mkimge: Reject signing-related flags without FIT_SIGNATURE

[Joel Stanley <joel@jms.id.au>]

When CONFIG_FIT_SIGNATURE=n the signing options are not available. If a
user is careful they will notice this when looking at the help output.

If they are not careful they will waste several hours wondering why
their FIT doesn't contain a /signature node, as mkimage will silently
ingore the signing related options.

Make it obvious that the commands don't work by removing them from the
getopt opt_string.

 $ mkimage -f machine.its -k keys -K u-boot-pubkey.dtb -r image.fit
 mkimage: invalid option -- 'k'
 Error: Invalid option

Signed-off-by: Joel Stanley <joel@jms.id.au>
--
v2: Leave padding related options in the CONFIG_FIT_SIGNATURE=y optargs
---
 tools/mkimage.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/tools/mkimage.c b/tools/mkimage.c
index 68d5206cb4fd..f7d3ac40e681 100644
--- a/tools/mkimage.c
+++ b/tools/mkimage.c
@@ -142,7 +142,11 @@ static int add_content(int type, const char *fname)
 	return 0;
 }
 
+#ifdef CONFIG_FIT_SIGNATURE
 #define OPT_STRING "a:A:b:B:c:C:d:D:e:Ef:Fk:i:K:ln:N:p:O:rR:qstT:vVx"
+#else
+#define OPT_STRING "a:A:b:B:C:d:D:e:Ef:i:ln:O:R:qstT:vVx"
+#endif
 static void process_args(int argc, char **argv)
 {
 	char *ptr;
@@ -150,8 +154,7 @@ static void process_args(int argc, char **argv)
 	char *datafile = NULL;
 	int opt;
 
-	while ((opt = getopt(argc, argv,
-		   "a:A:b:B:c:C:d:D:e:Ef:Fk:i:K:ln:N:p:O:rR:qstT:vVx")) != -1) {
+	while ((opt = getopt(argc, argv, OPT_STRING)) != -1) {
 		switch (opt) {
 		case 'a':
 			params.addr = strtoull(optarg, &ptr, 16);
-- 
2.29.2