Handles spaces in array names better.

1/ When printing the "name=" entry for --brief output,
   enclose name in quotes if it contains spaces etc.
   Quotes are already supported for reading mdadm.conf

2/ When a name is used as a device name, translate spaces
   and tabs to '_', as well as the current translation of
   '/' to '-'.

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

Detail.c

@@ -206,8 +206,11 @@ int Detail(char *dev, struct context *c)
 			printf("MD_UUID=%s\n", nbuf+5);
 			mp = map_by_uuid(&map, info->uuid);
 			if (mp && mp->path &&
-			    strncmp(mp->path, "/dev/md/", 8) == 0)
-				printf("MD_DEVNAME=%s\n", mp->path+8);
+			    strncmp(mp->path, "/dev/md/", 8) == 0) {
+				printf("MD_DEVNAME=");
+				print_escape(mp->path+8);
+				putchar('\n');
+			}
 
 			if (st->ss->export_detail_super)
 				st->ss->export_detail_super(st);
@@ -220,8 +223,11 @@ int Detail(char *dev, struct context *c)
 				printf("MD_UUID=%s\n", nbuf+5);
 			}
 			if (mp && mp->path &&
-			    strncmp(mp->path, "/dev/md/", 8) == 0)
-				printf("MD_DEVNAME=%s\n", mp->path+8);
+			    strncmp(mp->path, "/dev/md/", 8) == 0) {
+				printf("MD_DEVNAME=");
+				print_escape(mp->path+8);
+				putchar('\n');
+			}
 		}
 		goto out;
 	}

lib.c

@@ -322,3 +322,71 @@ char *conf_word(FILE *file, int allow_key)
 	}
 	return word;
 }
+
+void print_quoted(char *str)
+{
+	/* Printf the string with surrounding quotes
+	 * iff needed.
+	 * If no space, tab, or quote - leave unchanged.
+	 * Else print surrounded by " or ', swapping quotes
+	 * when we find one that will cause confusion.
+	 */
+
+	char first_quote = 0, q;
+	char *c;
+
+	for (c = str; *c; c++) {
+		switch(*c) {
+		case '\'':
+		case '"':
+			first_quote = *c;
+			break;
+		case ' ':
+		case '\t':
+			first_quote = *c;
+			continue;
+		default:
+			continue;
+		}
+		break;
+	}
+	if (!first_quote) {
+		printf("%s", str);
+		return;
+	}
+
+	if (first_quote == '"')
+		q = '\'';
+	else
+		q = '"';
+	putchar(q);
+	for (c = str; *c; c++) {
+		if (*c == q) {
+			putchar(q);
+			q ^= '"' ^ '\'';
+			putchar(q);
+		}
+		putchar(*c);
+	}
+	putchar(q);
+}
+
+void print_escape(char *str)
+{
+	/* print str, but change space and tab to '_'
+	 * as is suitable for device names
+	 */
+	for (; *str ; str++) {
+		switch (*str) {
+		case ' ':
+		case '\t':
+			putchar('_');
+			break;
+		case '/':
+			putchar('-');
+			break;
+		default:
+			putchar(*str);
+		}
+	}
+}

mapfile.c

@@ -422,7 +422,7 @@ void RebuildMap(void)
 				 * an MD_DEVNAME for udev.
 				 * The name needs to be unique both in /dev/md/
 				 * and in this mapfile.
-				 * It needs to match watch -I or -As would come
+				 * It needs to match what -I or -As would come
 				 * up with.
 				 * That means:
 				 *   Check if array is in mdadm.conf 

mdadm.h

@@ -1196,6 +1196,8 @@ extern char *conf_get_program(void);
 extern char *conf_get_homehost(int *require_homehostp);
 extern char *conf_line(FILE *file);
 extern char *conf_word(FILE *file, int allow_key);
+extern void print_quoted(char *str);
+extern void print_escape(char *str);
 extern int conf_name_is_free(char *name);
 extern int conf_verify_devnames(struct mddev_ident *array_list);
 extern int devname_matches(char *name, char *match);

mdopen.c

@@ -286,8 +286,17 @@ int create_mddev(char *dev, char *name, int autof, int trustworthy,
 		int cnlen;
 		strncpy(cname, name, 200);
 		cname[200] = 0;
-		while ((cp = strchr(cname, '/')) != NULL)
-			*cp = '-';
+		for (cp = cname; *cp ; cp++)
+			switch (*cp) {
+			case '/':
+				*cp = '-';
+				break;
+			case ' ':
+			case '\t':
+				*cp = '_';
+				break;
+			}
+
 		if (trustworthy == LOCAL ||
 		    (trustworthy == FOREIGN && strchr(cname, ':') != NULL)) {
 			/* Only need suffix if there is a conflict */

super1.c

@@ -485,7 +485,12 @@ static void brief_examine_super1(struct supertype *st, int verbose)
 	else
 		nm = NULL;
 
-	printf("ARRAY%s%s", nm ? " /dev/md/":"", nm);
+	printf("ARRAY ");
+	if (nm) {
+		printf("/dev/md/");
+		print_escape(nm);
+		putchar(' ');
+	}
 	if (verbose && c)
 		printf(" level=%s", c);
 	sb_offset = __le64_to_cpu(sb->super_offset);
@@ -502,8 +507,10 @@ static void brief_examine_super1(struct supertype *st, int verbose)
 		if ((i&3)==0 && i != 0) printf(":");
 		printf("%02x", sb->set_uuid[i]);
 	}
-	if (sb->set_name[0])
-		printf(" name=%.32s", sb->set_name);
+	if (sb->set_name[0]) {
+		printf(" name=");
+		print_quoted(sb->set_name);
+	}
 	printf("\n");
 }
 
@@ -584,8 +591,10 @@ static void brief_detail_super1(struct supertype *st)
 	struct mdp_superblock_1 *sb = st->sb;
 	int i;
 
-	if (sb->set_name[0])
-		printf(" name=%.32s", sb->set_name);
+	if (sb->set_name[0]) {
+		printf(" name=");
+		print_quoted(sb->set_name);
+	}
 	printf(" UUID=");
 	for (i=0; i<16; i++) {
 		if ((i&3)==0 && i != 0) printf(":");