Make sure name matching for array assembly understand the possibility of a homehost

This "--assemble --name=foo" on host 'bar' will assemble an array named
'foo' or 'bar:foo'.

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

2 files changed, 26 insertions, 2 deletions

diff --git a/Assemble.c b/Assemble.c
index 1dc0ffc..d35aa5a 100644
--- a/Assemble.c
+++ b/Assemble.c
@@ -29,6 +29,26 @@
 
 #include	"mdadm.h"
 
+static int name_matches(char *found, char *required, char *homehost)
+{
+	/* See if the name found matches the required name, possibly
+	 * prefixed with 'homehost'
+	 */
+	char fnd[33];
+
+	strncpy(fnd, found, 32);
+	fnd[32] = 0;
+	if (strcmp(found, required)==0)
+		return 1;
+	if (homehost) {
+		int l = strlen(homehost);
+		if (l < 32 && fnd[l] == ':' &&
+		    strcmp(fnd+l+1, required)==0)
+			return 1;
+	}
+	return 0;
+}
+
 int Assemble(struct supertype *st, char *mddev, int mdfd,
 	     mddev_ident_t ident, char *conffile,
 	     mddev_dev_t devlist, char *backup_file,
@@ -226,7 +246,7 @@ int Assemble(struct supertype *st, char *mddev, int mdfd,
 			continue;
 		}
 		if (ident->name[0] && (!update || strcmp(update, "name")!= 0) &&
-		    (!super || strncmp(info.name, ident->name, 32)!=0)) {
+		    (!super || name_matches(info.name, ident->name, homehost)==0)) {
 			if ((inargv && verbose >= 0) || verbose > 0)
 				fprintf(stderr, Name ": %s has wrong name.\n",
 					devname);
diff --git a/mdadm.8 b/mdadm.8
index ebabaa4..a3d9dc5 100644
--- a/mdadm.8
+++ b/mdadm.8
@@ -595,7 +595,11 @@ will look for super blocks with a minor number of 0.
 .TP
 .BR -N ", " --name=
 Specify the name of the array to assemble.  This must be the name
-that was specified when creating the array.
+that was specified when creating the array.  It must either match
+then name stored in the superblock exactly, or it must match
+which the current
+.I homehost
+is added to the start of the given name.
 
 .TP
 .BR -f ", " --force