[pkg-haskell-tools] 04/05: make-all: Avoid rebuliding everything just because the list of packages changed

[Joachim Breitner]

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commit dd7dafc0a2ffb01f3f81906a09f34d30005ea4a3
Author: Joachim Breitner <mail at joachim-breitner.de>
Date:   Fri Aug 14 10:30:17 2015 +0200

    make-all: Avoid rebuliding everything just because the list of packages changed
---
 src/make-all.hs | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/make-all.hs b/src/make-all.hs
index 9b833e9..1e57bce 100644
--- a/src/make-all.hs
+++ b/src/make-all.hs
@@ -371,7 +371,9 @@ shakeMain conf@(Conf {..}) = do
 
         -- What files do we have built locally?
         -- Make sure the build uses only them
-        expectedDeps <- S.fromList <$> readFileLines (targetDir </> "cache" </> "all-binaries.txt")
+        -- Do not use readFileLines or readFile', lest we rebuild everything
+        -- if the set of packages changes.
+        expectedDeps <- S.fromList . lines <$> liftIO (readFile (targetDir </> "cache" </> "all-binaries.txt"))
         localDebs <-
             filter (`S.member` expectedDeps) .
             map (makeRelative targetDir) <$>

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