Improve error message for adding bitmap to a level that cannot support it.

Also give error on --build if no devices given.

1 files changed, 10 insertions, 0 deletions

diff --git a/mdadm.c b/mdadm.c
index 43620b71..069c6d6d 100644
--- a/mdadm.c
+++ b/mdadm.c
@@ -1141,6 +1141,11 @@ int main(int argc, char *argv[])
 			rv = 1;
 			break;
 		}
+		if (raiddisks == 0) {
+			fprintf(stderr, Name ": no raid-disks specified.\n");
+			rv = 1;
+			break;
+		}
 
 		if (bitmap_file) {
 			if (strcmp(bitmap_file, "internal")==0) {
@@ -1160,6 +1165,11 @@ int main(int argc, char *argv[])
 			rv = 1;
 			break;
 		}
+		if (raiddisks == 0) {
+			fprintf(stderr, Name ": no raid-disks specified.\n");
+			rv = 1;
+			break;
+		}
 
 		rv = Create(ss, devlist->devname, mdfd, chunk, level, layout, size<0 ? 0 : size,
 			    raiddisks, sparedisks, ident.name, homehost,