From 65ed7a61f1ad01da440f0e7e08bfc32b43deed73 Mon Sep 17 00:00:00 2001
From: Tobias Geerinckx-Rice <me@tobias.gr>
Date: Sun, 18 Jun 2023 02:00:00 +0200
Subject: [PATCH] uuid: Fix NTFS UUID stringification.

Previously, (ntfs-uuid->string (string->ntfs-uuid"5234ED0D34ECF53F"))
would yield "5234EDD34ECF53F".

Reported by sughosha in #guix.

* gnu/system/uuid.scm (ntfs-uuid->string): Pad hex bytes with zero when
needed.
---
 gnu/system/uuid.scm | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/gnu/system/uuid.scm b/gnu/system/uuid.scm
index a95dc1b7d1..8f967387ad 100644
--- a/gnu/system/uuid.scm
+++ b/gnu/system/uuid.scm
@@ -209,7 +209,7 @@ ISO9660 UUID representation."
 
 (define (ntfs-uuid->string uuid)
   "Convert NTFS UUID, a 8-byte bytevector, to its string representation."
-  (format #f "~{~:@(~x~)~}" (reverse (bytevector->u8-list uuid))))
+  (format #f "~{~:@(~2,'0x~)~}" (reverse (bytevector->u8-list uuid))))
 
 (define %ntfs-uuid-rx
   (make-regexp "^([[:xdigit:]]{16})$"))