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diff --git a/hadrian/src/Base.hs b/hadrian/src/Base.hs
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+module Base (
+    -- * General utilities
+    module Control.Applicative,
+    module Control.Monad.Extra,
+    module Data.List.Extra,
+    module Data.Maybe,
+    module Data.Semigroup,
+    module Hadrian.Utilities,
+
+    -- * Shake
+    module Development.Shake,
+    module Development.Shake.Classes,
+    module Development.Shake.FilePath,
+    module Development.Shake.Util,
+
+    -- * Basic data types
+    module Hadrian.Package,
+    module Stage,
+    module Way,
+
+    -- * Paths
+    hadrianPath, configPath, configFile, sourcePath, configH, shakeFilesDir,
+    generatedDir, inplaceBinPath, inplaceLibBinPath, inplaceLibPath,
+    inplaceLibCopyTargets, templateHscPath, stage0PackageDbDir,
+    inplacePackageDbPath, packageDbPath, packageDbStamp
+    ) where
+
+import Control.Applicative
+import Control.Monad.Extra
+import Control.Monad.Reader
+import Data.List.Extra
+import Data.Maybe
+import Data.Semigroup
+import Development.Shake hiding (parallel, unit, (*>), Normal)
+import Development.Shake.Classes
+import Development.Shake.FilePath
+import Development.Shake.Util
+import Hadrian.Utilities
+import Hadrian.Package
+
+import Stage
+import Way
+
+-- | Hadrian lives in the 'hadrianPath' directory of the GHC tree.
+hadrianPath :: FilePath
+hadrianPath = "hadrian"
+
+-- TODO: Move this to build directory?
+-- | Path to system configuration files, such as 'configFile'.
+configPath :: FilePath
+configPath = hadrianPath -/- "cfg"
+
+-- | Path to the system configuration file generated by the @configure@ script.
+configFile :: FilePath
+configFile = configPath -/- "system.config"
+
+-- | Path to source files of the build system, e.g. this file is located at
+-- @sourcePath -/- "Base.hs"@. We use this to track some of the source files.
+sourcePath :: FilePath
+sourcePath = hadrianPath -/- "src"
+
+-- TODO: Change @mk/config.h@ to @shake-build/cfg/config.h@.
+-- | Path to the generated @mk/config.h@ file.
+configH :: FilePath
+configH = "mk/config.h"
+
+-- | The directory in 'buildRoot' containing the Shake database and other
+-- auxiliary files generated by Hadrian.
+shakeFilesDir :: FilePath
+shakeFilesDir = "hadrian"
+
+-- | The directory in 'buildRoot' containing generated source files that are not
+-- package-specific, e.g. @ghcplatform.h@.
+generatedDir :: FilePath
+generatedDir = "generated"
+
+-- | The directory in 'buildRoot' containing the 'Stage0' package database.
+stage0PackageDbDir :: FilePath
+stage0PackageDbDir = "stage0/bootstrapping.conf"
+
+-- | Path to the inplace package database used in 'Stage1' and later.
+inplacePackageDbPath :: FilePath
+inplacePackageDbPath = "inplace/lib/package.conf.d"
+
+-- | Path to the package database used in a given 'Stage'.
+packageDbPath :: Stage -> Action FilePath
+packageDbPath Stage0 = buildRoot <&> (-/- stage0PackageDbDir)
+packageDbPath _      = return inplacePackageDbPath
+
+-- | We use a stamp file to track the existence of a package database.
+packageDbStamp :: FilePath
+packageDbStamp = ".stamp"
+
+-- | Directory for binaries that are built "in place".
+inplaceBinPath :: FilePath
+inplaceBinPath = "inplace/bin"
+
+-- | Directory for libraries that are built "in place".
+inplaceLibPath :: FilePath
+inplaceLibPath = "inplace/lib"
+
+-- | Directory for binary wrappers, and auxiliary binaries such as @touchy@.
+inplaceLibBinPath :: FilePath
+inplaceLibBinPath = "inplace/lib/bin"
+
+-- ref: ghc/ghc.mk:142
+-- ref: driver/ghc.mk
+-- ref: utils/hsc2hs/ghc.mk:35
+-- | Files that need to be copied over to 'inplaceLibPath'.
+inplaceLibCopyTargets :: [FilePath]
+inplaceLibCopyTargets = map (inplaceLibPath -/-)
+    [ "ghc-usage.txt"
+    , "ghci-usage.txt"
+    , "llvm-targets"
+    , "platformConstants"
+    , "settings"
+    , "template-hsc.h" ]
+
+-- | Path to hsc2hs template.
+templateHscPath :: FilePath
+templateHscPath = "inplace/lib/template-hsc.h"