edd_id: check that EDD id is unique

The attached patch adds a check to edd_id.c to verify that the MBR
signature on the device node passed to the program is unique to only
that disk.

Signed-off-by: John Hull <john_hull@dell.com>

1 files changed, 15 insertions, 5 deletions

diff --git a/extras/edd_id/edd_id.c b/extras/edd_id/edd_id.c
index 504aac36..8ac50e98 100644
--- a/extras/edd_id/edd_id.c
+++ b/extras/edd_id/edd_id.c
@@ -63,6 +63,7 @@ int main(int argc, char *argv[])
 	int sysfs_fd;
 	DIR *dir = NULL;
 	int rc = 1;
+	char *match = NULL;
 
 	logging_init("edd_id");
 
@@ -165,14 +166,23 @@ int main(int argc, char *argv[])
 
 		sysfs_id = strtoul(sysfs_id_buf, NULL, 16);
 		if (disk_id == sysfs_id) {
+			if (!match) {
+				match = dent->d_name;
+			} else {
+				info("'%s' does not have a unique signature", node);
+				fprintf(stderr, "'%s' does not have a unique signature\n", node);
+				rc=10;
+				goto exit;
+			}
+		}
+
+	}
+
 			if (export)
-				printf("ID_EDD=%s\n", dent->d_name);
+		printf("ID_EDD=%s\n", match);
 			else
-				printf("%s\n", dent->d_name);
+		printf("%s\n", match);
 			rc = 0;
-			break;
-		}
-	}
 
 close:
 	close(disk_fd);