From 2149aa86bc0b0484e2144c9c441926eab52bd102 Mon Sep 17 00:00:00 2001
From: "Richard W.M. Jones" <rjones@redhat.com>
Date: Thu, 5 Feb 2015 08:13:05 +0000
Subject: [PATCH] resize: Preserve GPT GUID so we don't break EFI bootloaders
 (RHBZ#1189284).

When copying disks that use EFI, we created a new partition table,
randomizing the GPT GUID of the first partition.  Since EFI may store
the GUID in its NVRAM variables, this could make the guest unbootable.

(cherry picked from commit f630677c14c7d5528e1ab39e4f805e0957b2ee3e)
---
 resize/resize.ml | 22 ++++++++++++++++++++--
 1 file changed, 20 insertions(+), 2 deletions(-)

diff --git a/resize/resize.ml b/resize/resize.ml
index 2090675..b581b39 100644
--- a/resize/resize.ml
+++ b/resize/resize.ml
@@ -50,6 +50,7 @@ type partition = {
   p_id : partition_id;           (* Partition (MBR/GPT) ID. *)
   p_type : partition_content;    (* Content type and content size. *)
   p_label : string option;       (* Label/name. *)
+  p_guid : string option;        (* Partition GUID (GPT only). *)
 
   (* What we're going to do: *)
   mutable p_operation : partition_operation;
@@ -93,6 +94,11 @@ let rec debug_partition p =
     (match p.p_label with
     | Some label -> label
     | None -> "(none)"
+    );
+  printf "\tGUID: %s\n"
+    (match p.p_guid with
+    | Some guid -> guid
+    | None -> "(none)"
     )
 and string_of_partition_content = function
   | ContentUnknown -> "unknown data"
@@ -478,10 +484,16 @@ read the man page virt-resize(1).
           let label =
             try Some (g#part_get_name "/dev/sda" part_num)
             with G.Error _ -> None in
+          let guid =
+            match parttype with
+            | MBR -> None
+            | GPT ->
+              try Some (g#part_get_gpt_guid "/dev/sda" part_num)
+              with G.Error _ -> None in
 
           { p_name = name; p_part = part;
             p_bootable = bootable; p_id = id; p_type = typ;
-            p_label = label;
+            p_label = label; p_guid = guid;
             p_operation = OpCopy; p_target_partnum = 0;
             p_target_start = 0L; p_target_end = 0L }
       ) parts in
@@ -1068,7 +1080,7 @@ read the man page virt-resize(1).
           p_part = { G.part_num = 0l; part_start = 0L; part_end = 0L;
                      part_size = 0L };
           p_bootable = false; p_id = No_ID; p_type = ContentUnknown;
-          p_label = None;
+          p_label = None; p_guid = None;
 
           (* Target information is meaningful. *)
           p_operation = OpIgnore;
@@ -1162,6 +1174,12 @@ read the man page virt-resize(1).
       | None -> ()
       );
 
+      (match p.p_guid with
+      | Some guid ->
+        g#part_set_gpt_guid "/dev/sdb" p.p_target_partnum guid;
+      | None -> ()
+      );
+
       match parttype, p.p_id with
       | GPT, GPT_Type gpt_type ->
         g#part_set_gpt_type "/dev/sdb" p.p_target_partnum gpt_type
-- 
1.8.3.1