git.iko.soy/stackage
on a29ba67 help sign in
stackage/Stackage/CheckPlan.hs
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1module Stackage.CheckPlan
2 ( checkPlan
3 ) where
5import Control.Monad (unless, when)
6import Data.List (isPrefixOf, sort)
7import qualified Data.Map as Map
8import qualified Data.Set as Set
9import Stackage.CheckCabalVersion (checkCabalVersion)
10import Stackage.InstallInfo
11import Stackage.Types
12import Stackage.Util
13import System.Exit (ExitCode (ExitFailure, ExitSuccess),
14 exitWith)
15import System.Process (readProcessWithExitCode)
17data Mismatch = OnlyDryRun String | OnlySimpleList String
18 deriving Show
20checkPlan :: BuildPlan -> IO ()
21checkPlan bp = do
22 _ <- checkCabalVersion
24 putStrLn "Checking build plan"
25 (ec, dryRun', stderr) <- readProcessWithExitCode "cabal" (addCabalArgsOnlyGlobal $ "install":"--dry-run":bpPackageList bp) ""
26 when (ec /= ExitSuccess || "Warning:" `isPrefixOf` stderr) $ do
27 putStr stderr
28 putStr dryRun'
29 putStrLn "cabal returned a bad result, exiting"
30 exitWith ec
31 let dryRun = sort $ filter notOptionalCore $ map (takeWhile (/= ' ')) $ drop 2 $ lines dryRun'
32 let mismatches = getMismatches dryRun (filter notOptionalCore $ bpPackageList bp)
33 unless (null $ filter (not . acceptableMismatch) mismatches) $ do
34 putStrLn "Found the following mismatches"
35 mapM_ print mismatches
36 exitWith $ ExitFailure 1
37 putStrLn "Build plan checked, no mismatches"
38 where
39 optionalCore = Set.fromList $ map packageVersionString $ Map.toList $ bpOptionalCore bp
40 notOptionalCore s = not $ s `Set.member` optionalCore
42getMismatches :: [String] -> [String] -> [Mismatch]
43getMismatches =
44 go
45 where
46 go [] y = map OnlySimpleList y
47 go x [] = map OnlyDryRun x
48 go (x:xs) (y:ys) =
49 case compare x y of
50 EQ -> go xs ys
51 LT -> OnlyDryRun x : go xs (y:ys)
52 GT -> OnlySimpleList y : go (x:xs) ys
54-- | Some mismatches are going to be acceptable. The reasons are described
55-- below.
56acceptableMismatch :: Mismatch -> Bool
57acceptableMismatch m =
58 case m of
59 -- GHC 7.4 included extensible-extensions as a core package, and
60 -- therefore the HP at time of writing (2012.4.0.0) includes it in that
61 -- list. However, GHC 7.6 does /not/ include that package. As a result,
62 -- we get that package included in the dry run but not our list of
63 -- packages to build. See issue #57.
64 OnlyDryRun s | "extensible-exceptions-" `isPrefixOf` s -> True
65 _ -> False