From e036d5f7228d746c00783dc2de7909e92b2f423e Mon Sep 17 00:00:00 2001
From: Michael Hudson-Doyle <michael.hudson@canonical.com>
Date: Thu, 16 Apr 2020 23:24:12 +1200
Subject: [PATCH] fix prep edge case

---
 subiquity/controllers/filesystem.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/subiquity/controllers/filesystem.py b/subiquity/controllers/filesystem.py
index 974ebffa..44145156 100644
--- a/subiquity/controllers/filesystem.py
+++ b/subiquity/controllers/filesystem.py
@@ -399,7 +399,8 @@ class FilesystemController(SubiquityController):
 
     def create_filesystem(self, volume, spec):
         if spec['fstype'] is None:
-            volume.wipe = None
+            if getattr(volume, 'flag', None) != 'prep':
+                volume.wipe = None
             fstype = volume.original_fstype()
             if fstype is None:
                 return None