config: restore the possibility of a NULL homehost

As homehost defaults to the system name it is not possible to specify
a NULL homehost.

This patch restored this ability with either --homehost="" or
--homehost="<none>".

This allows the creation of v1.x arrays without a "hostname:"
prefix in the name.

Signed-off-by: NeilBrown <neilb@suse.de>

1 files changed, 5 insertions, 1 deletions

diff --git a/mdadm.c b/mdadm.c
index ec05e6e8..96d32b53 100644
--- a/mdadm.c
+++ b/mdadm.c
@@ -1167,12 +1167,16 @@ int main(int argc, char *argv[])
 
 	if (homehost == NULL)
 		homehost = conf_get_homehost(&require_homehost);
-	if (homehost == NULL || strcmp(homehost, "<system>")==0) {
+	if (homehost == NULL || strcasecmp(homehost, "<system>")==0) {
 		if (gethostname(sys_hostname, sizeof(sys_hostname)) == 0) {
 			sys_hostname[sizeof(sys_hostname)-1] = 0;
 			homehost = sys_hostname;
 		}
 	}
+	if (homehost && (!homehost[0] || strcasecmp(homehost, "<none>") == 0)) {
+		homehost = NULL;
+		require_homehost = 0;
+	}
 
 	if ((mode != MISC || devmode != 'E') &&
 	    geteuid() != 0) {