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-rw-r--r--src/Propellor/Protocol.hs6
1 files changed, 5 insertions, 1 deletions
diff --git a/src/Propellor/Protocol.hs b/src/Propellor/Protocol.hs
index bc8d9327..ae7e0404 100644
--- a/src/Propellor/Protocol.hs
+++ b/src/Propellor/Protocol.hs
@@ -53,7 +53,11 @@ sendMarked' h marker s = do
hFlush h
getMarked :: Handle -> Marker -> IO (Maybe String)
-getMarked h marker = go =<< catchMaybeIO (hGetLine h)
+getMarked h marker = do
+ -- Avoid buffering anything in Handle, so that the data after
+ -- the marker will be available to be read from the underlying Fd.
+ hSetBuffering stdin NoBuffering
+ go =<< catchMaybeIO (hGetLine h)
where
go Nothing = return Nothing
go (Just l) = case fromMarked marker l of