[PATCH 8/9] commands: ln: accept -s option

[Sascha Hauer <s.hauer@pengutronix.de>]

All links barebox creates are symbolic links, but ln does not accept
the -s option, so the common 'ln -s SRC DEST' fails with a usage error.
Accept -s and ignore it, so that users and scripts can use the familiar
syntax.

While at it, add a help text for the command.

Assisted-by: Claude:claude-opus-5-5
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
---
 commands/ln.c | 30 +++++++++++++++++++++++++++---
 1 file changed, 27 insertions(+), 3 deletions(-)

diff --git a/commands/ln.c b/commands/ln.c
index 9206480300..c907b306c9 100644
--- a/commands/ln.c
+++ b/commands/ln.c
@@ -9,22 +9,46 @@
 #include <environment.h>
 #include <fs.h>
 #include <errno.h>
+#include <getopt.h>
 
 static int do_ln(int argc, char *argv[])
 {
-	if (argc != 3)
+	int opt;
+
+	while ((opt = getopt(argc, argv, "s")) > 0) {
+		switch (opt) {
+		case 's':
+			/* all links are symbolic, accept -s for compatibility */
+			break;
+		default:
+			return COMMAND_ERROR_USAGE;
+		}
+	}
+
+	argc -= optind;
+	argv += optind;
+
+	if (argc != 2)
 		return COMMAND_ERROR_USAGE;
 
-	if (symlink(argv[1], argv[2]) < 0) {
+	if (symlink(argv[0], argv[1]) < 0) {
 		perror("ln");
 		return 1;
 	}
 	return 0;
 }
 
+BAREBOX_CMD_HELP_START(ln)
+BAREBOX_CMD_HELP_TEXT("Create a symbolic link DEST pointing to SRC.")
+BAREBOX_CMD_HELP_TEXT("")
+BAREBOX_CMD_HELP_TEXT("Options:")
+BAREBOX_CMD_HELP_OPT("-s", "ignored, all links are symbolic links")
+BAREBOX_CMD_HELP_END
+
 BAREBOX_CMD_START(ln)
 	.cmd		= do_ln,
 	BAREBOX_CMD_DESC("create symlink (make a new name for a file)")
-	BAREBOX_CMD_OPTS("SRC DEST")
+	BAREBOX_CMD_OPTS("[-s] SRC DEST")
 	BAREBOX_CMD_GROUP(CMD_GRP_FILE)
+	BAREBOX_CMD_HELP(cmd_ln_help)
 BAREBOX_CMD_END

-- 
2.47.3