File efibootmgr-0.6.0-write-unique-id-once.diff of Package efibootmgr

From: Raymund Will <>
Subject: Don't let '--write-signature' overwrite unique signatures.
References: bnc#

Using '--write-signature' on an MBR-partitioned disk always overwrites
the previous signature, even if it was already unique.
While not using GPT is against the spec, it still works most of the time.
The issue is, that excessively writing new entries to NVRAM (and incidentally
breaking all old references to the partition in question) was found to
bring trouble to certain systems.

Signed-off-by: Raymund Will <>
 src/lib/disk.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/src/lib/disk.c
+++ b/src/lib/disk.c
@@ -353,7 +353,7 @@ msdos_disk_get_partition_info (int fd, l
-	else if (opts.write_signature) {
+	else if (!mbr->unique_mbr_signature && opts.write_signature) {
 		/* MBR Signatures must be unique for the 
 		   EFI Boot Manager
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