From 6c53b98346f2dd3e97fcfe30919362245ffe9745 Mon Sep 17 00:00:00 2001
From: Daniel Gröber <dxld@darkboxed.org>
Date: Sat, 27 Oct 2018 21:05:49 +0200
Subject: Fix getProjConfModTime: allow missing *.project.{local,freeze} files

---
 lib/Distribution/Helper.hs | 13 ++++++++++---
 1 file changed, 10 insertions(+), 3 deletions(-)

diff --git a/lib/Distribution/Helper.hs b/lib/Distribution/Helper.hs
index e98427e..97670de 100644
--- a/lib/Distribution/Helper.hs
+++ b/lib/Distribution/Helper.hs
@@ -196,12 +196,19 @@ getProjConfModTime ProjConfV1{pcV1CabalFile} =
   fmap ProjConfModTimes $ mapM getFileModTime
     [ pcV1CabalFile
     ]
-getProjConfModTime ProjConfV2{..} =
-  fmap ProjConfModTimes $ mapM getFileModTime
+getProjConfModTime ProjConfV2{..} = do
+  mandatory <- mapM getFileModTime $
     [ pcV2CabalProjFile
-    , pcV2CabalProjLocalFile
+    ]
+  optional <- mapM (traverse getFileModTime <=< mightExist)
+    [ pcV2CabalProjLocalFile
     , pcV2CabalProjFreezeFile
     ]
+  return $
+    ProjConfModTimes $
+      mandatory ++
+      catMaybes optional
+
 getProjConfModTime ProjConfStack{..} =
   fmap ProjConfModTimes $ mapM getFileModTime
     [ pcStackYaml
-- 
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