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diff --git a/src/CabalHelper/Compiletime/Types/Cabal.hs b/src/CabalHelper/Compiletime/Types/Cabal.hs
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+-- cabal-helper: Simple interface to Cabal's configuration state
+-- Copyright (C) 2020  Daniel Gröber <cabal-helper@dxld.at>
+--
+-- SPDX-License-Identifier: Apache-2.0
+--
+-- Licensed under the Apache License, Version 2.0 (the "License");
+-- you may not use this file except in compliance with the License.
+-- You may obtain a copy of the License at
+--
+--     http://www.apache.org/licenses/LICENSE-2.0
+
+{-|
+Module      : CabalHelper.Compiletime.Types.Cabal
+License     : Apache-2.0
+-}
+
+{-# LANGUAGE DeriveFunctor #-}
+
+module CabalHelper.Compiletime.Types.Cabal where
+
+import Data.Version
+
+-- | Cabal library version we're compiling the helper exe against.
+data CabalVersion' a
+    = CabalHEAD a
+    | CabalVersion { cvVersion :: Version }
+      deriving (Eq, Ord, Functor)
+
+newtype CommitId = CommitId { unCommitId :: String }
+
+type UnpackedCabalVersion = CabalVersion' (CommitId, CabalSourceDir)
+type ResolvedCabalVersion = CabalVersion' CommitId
+type CabalVersion = CabalVersion' ()
+
+data UnpackCabalVariant = Pristine | LatestRevision
+newtype CabalSourceDir = CabalSourceDir { unCabalSourceDir :: FilePath }
+
+
+unpackedToResolvedCabalVersion :: UnpackedCabalVersion -> ResolvedCabalVersion
+unpackedToResolvedCabalVersion (CabalHEAD (commit, _)) = CabalHEAD commit
+unpackedToResolvedCabalVersion (CabalVersion ver) = CabalVersion ver
+
+showUnpackedCabalVersion :: UnpackedCabalVersion -> String
+showUnpackedCabalVersion (CabalHEAD (commitid, _)) =
+  "HEAD-" ++ unCommitId commitid
+showUnpackedCabalVersion CabalVersion {cvVersion} =
+  showVersion cvVersion
+
+showResolvedCabalVersion :: ResolvedCabalVersion -> String
+showResolvedCabalVersion (CabalHEAD commitid) =
+  "HEAD-" ++ unCommitId commitid
+showResolvedCabalVersion CabalVersion {cvVersion} =
+  showVersion cvVersion
+
+showCabalVersion :: CabalVersion -> String
+showCabalVersion (CabalHEAD ()) =
+  "HEAD"
+showCabalVersion CabalVersion {cvVersion} =
+  showVersion cvVersion