1 files changed, 36 insertions, 0 deletions
diff --git a/src/Propellor/Debug.hs b/src/Propellor/Debug.hs
new file mode 100644
index 00000000..ac4a56cc
--- /dev/null
+++ b/src/Propellor/Debug.hs
@@ -0,0 +1,36 @@
+module Propellor.Debug where
+
+import Control.Applicative
+import Control.Monad.IfElse
+import System.IO
+import System.Directory
+import System.Log.Logger
+import System.Log.Formatter
+import System.Log.Handler (setFormatter)
+import System.Log.Handler.Simple
+
+import Utility.Monad
+import Utility.Env
+import Utility.Exception
+import Utility.Process
+
+debug :: [String] -> IO ()
+debug = debugM "propellor" . unwords
+
+checkDebugMode :: IO ()
+checkDebugMode = go =<< getEnv "PROPELLOR_DEBUG"
+  where
+	go (Just "1") = enableDebugMode
+	go (Just _) = noop
+	go Nothing = whenM (doesDirectoryExist ".git") $
+		whenM (elem "1" . lines <$> getgitconfig) enableDebugMode
+	getgitconfig = catchDefaultIO "" $
+		readProcess "git" ["config", "propellor.debug"]
+
+enableDebugMode :: IO ()
+enableDebugMode = do
+	f <- setFormatter
+		<$> streamHandler stderr DEBUG
+		<*> pure (simpleLogFormatter "[$time] $msg")
+	updateGlobalLogger rootLoggerName $ 
+		setLevel DEBUG .  setHandlers [f]