Combine non-installable & non-upgradable packages

cabal-install-solver/src/Distribution/Solver/Modular.hs

@@ -60,7 +60,7 @@ import Distribution.Verbosity
 -- solver. Performs the necessary translations before and after.
 modularResolver :: SolverConfig -> DependencyResolver loc
 modularResolver sc (Platform arch os) cinfo iidx sidx pkgConfigDB pprefs pcs pns =
-  fmap (uncurry postprocess) $ -- convert install plan
+  uncurry postprocess <$> -- convert install plan
   solve' sc cinfo idx pkgConfigDB pprefs gcs pns
     where
       -- Indices have to be converted into solver-specific uniform index.
@@ -275,7 +275,7 @@ tryToMinimizeConflictSet runSolver sc cs cm =
                              ++ "conflict set: " ++ showCS cs') $
                   ExhaustiveSearch smallestKnownCS smallestKnownCM
             BackjumpLimitReached ->
-                failWith ("Reached backjump limit while minimizing conflict set.")
+                failWith "Reached backjump limit while minimizing conflict set."
                          BackjumpLimitReached
       where
         varStr = "\"" ++ showVar v ++ "\""

cabal-install-solver/src/Distribution/Solver/Modular/Solver.hs

@@ -67,6 +67,7 @@ data SolverConfig = SolverConfig {
   shadowPkgs             :: ShadowPkgs,
   strongFlags            :: StrongFlags,
   allowBootLibInstalls   :: AllowBootLibInstalls,
+  nonInstallablePackages :: [PackageName],
   onlyConstrained        :: OnlyConstrained,
   maxBackjumps           :: Maybe Int,
   enableBackjumping      :: EnableBackjumping,
@@ -142,7 +143,7 @@ solve sc cinfo idx pkgConfigDB userPrefs userConstraints userGoals =
     prunePhase       = (if asBool (avoidReinstalls sc) then P.avoidReinstalls (const True) else id) .
                        (if asBool (allowBootLibInstalls sc)
                         then id
-                        else P.requireInstalled (`elem` nonInstallable)) .
+                        else P.requireInstalled (`elem` nonInstallablePackages sc)) .
                        (case onlyConstrained sc of
                           OnlyConstrainedAll ->
                             P.onlyConstrained pkgIsExplicit
@@ -155,23 +156,6 @@ solve sc cinfo idx pkgConfigDB userPrefs userConstraints userGoals =
     pkgIsExplicit :: PN -> Bool
     pkgIsExplicit pn = S.member pn allExplicit
 
-    -- packages that can never be installed or upgraded
-    -- If you change this enumeration, make sure to update the list in
-    -- "Distribution.Client.Dependency" as well
-    nonInstallable :: [PackageName]
-    nonInstallable =
-        L.map mkPackageName
-             [ "base"
-             , "ghc-bignum"
-             , "ghc-prim"
-             , "ghc-boot"
-             , "ghc"
-             , "ghci"
-             , "integer-gmp"
-             , "integer-simple"
-             , "template-haskell"
-             ]
-
     -- When --reorder-goals is set, we use preferReallyEasyGoalChoices, which
     -- prefers (keeps) goals only if the have 0 or 1 enabled choice.
     --

cabal-install/src/Distribution/Client/Dependency.hs

@@ -395,24 +395,31 @@ dontUpgradeNonUpgradeablePackages params =
         (PackageConstraint (ScopeAnyQualifier pkgname) PackagePropertyInstalled)
         ConstraintSourceNonUpgradeablePackage
       | Set.notMember (mkPackageName "base") (depResolverTargets params)
-      -- If you change this enumeration, make sure to update the list in
-      -- "Distribution.Solver.Modular.Solver" as well
-      , pkgname <- [ mkPackageName "base"
-                   , mkPackageName "ghc-bignum"
-                   , mkPackageName "ghc-prim"
-                   , mkPackageName "ghc-boot"
-                   , mkPackageName "ghc"
-                   , mkPackageName "ghci"
-                   , mkPackageName "integer-gmp"
-                   , mkPackageName "integer-simple"
-                   , mkPackageName "template-haskell"
-                   ]
+      , pkgname <- nonUpgradeablePackages
       , isInstalled pkgname ]
 
     isInstalled = not . null
                 . InstalledPackageIndex.lookupPackageName
                                  (depResolverInstalledPkgIndex params)
 
+-- NOTE: the lists of non-upgradable and non-installable packages used to be
+-- respectively in this module and in `Distribution.Solver.Modular.Solver`.
+-- Since they were kept synced, they are now combined in the following list.
+--
+-- See: https://github.com/haskell/cabal/issues/8581
+nonUpgradeablePackages :: [PackageName]
+nonUpgradeablePackages =
+  [ mkPackageName "base"
+  , mkPackageName "ghc-bignum"
+  , mkPackageName "ghc-prim"
+  , mkPackageName "ghc-boot"
+  , mkPackageName "ghc"
+  , mkPackageName "ghci"
+  , mkPackageName "integer-gmp"
+  , mkPackageName "integer-simple"
+  , mkPackageName "template-haskell"
+  ]
+
 addSourcePackages :: [UnresolvedSourcePackage]
                   -> DepResolverParams -> DepResolverParams
 addSourcePackages pkgs params =
@@ -469,7 +476,7 @@ removeBounds  relKind relDeps            params =
     }
   where
     sourcePkgIndex' :: PackageIndex.PackageIndex UnresolvedSourcePackage
-    sourcePkgIndex' = fmap relaxDeps $ depResolverSourcePkgIndex params
+    sourcePkgIndex' = relaxDeps <$> depResolverSourcePkgIndex params
 
     relaxDeps :: UnresolvedSourcePackage -> UnresolvedSourcePackage
     relaxDeps srcPkg = srcPkg
@@ -710,7 +717,11 @@ resolveDependencies platform comp pkgConfigDB solver params =
   $ fmap (validateSolverResult platform comp indGoals)
   $ runSolver solver (SolverConfig reordGoals cntConflicts fineGrained minimize
                       indGoals noReinstalls
-                      shadowing strFlags allowBootLibs onlyConstrained_ maxBkjumps enableBj
+                      shadowing strFlags allowBootLibs
+                      -- See comment of nonUpgradeablePackages about
+                      -- non-installable and non-upgradable packages.
+                      nonUpgradeablePackages
+                      onlyConstrained_ maxBkjumps enableBj
                       solveExes order verbosity (PruneAfterFirstSuccess False))
                      platform comp installedPkgIndex sourcePkgIndex
                      pkgConfigDB preferences constraints targets