Propellor now builds itself without needing the Makefile.

1 files changed, 42 insertions, 0 deletions

diff --git a/src/Propellor/Bootstrap.hs b/src/Propellor/Bootstrap.hs
new file mode 100644
index 00000000..7ad4bb1f
--- /dev/null
+++ b/src/Propellor/Bootstrap.hs
@@ -0,0 +1,42 @@
+module Propellor.Bootstrap (
+	buildPropellor
+) where
+
+import Propellor
+import Utility.SafeCommand
+
+import System.Posix.Files
+
+buildPropellor :: IO ()
+buildPropellor = unlessM (actionMessage "Propellor build" build) $
+	errorMessage "Propellor build failed!"
+
+-- Build propellor using cabal, and symlink propellor to where cabal
+-- leaves the built binary.
+--
+-- For speed, only runs cabal configure when it's not been run before.
+-- If the build fails cabal may need to have configure re-run.
+build :: IO Bool
+build = catchBoolIO $ do
+	make "dist/setup-config" ["propellor.cabal"] $
+		cabal ["configure"]
+	unlessM (cabal ["build"]) $ do
+		void $ cabal ["configure"]
+		unlessM (cabal ["build"]) $
+			error "cabal build failed"
+	nukeFile "propellor"
+	createSymbolicLink "dist/build/propellor-config/propellor-config" "propellor"
+	return True
+
+make :: FilePath -> [FilePath] -> IO Bool -> IO ()
+make dest srcs builder = do
+	dt <- getmtime dest
+	st <- mapM getmtime srcs
+	when (dt == Nothing || any (> dt) st) $
+		unlessM builder $
+			error $ "failed to make " ++ dest
+  where
+	getmtime = catchMaybeIO . getModificationTime
+
+cabal :: [String] -> IO Bool
+cabal = boolSystem "cabal" . map Param