refactor

Git/Env.hs

@@ -0,0 +1,38 @@
+{- Adjusting the environment while running git commands.
+ -
+ - Copyright 2014-2016 Joey Hess <id@joeyh.name>
+ -
+ - Licensed under the GNU GPL version 3 or higher.
+ -}
+
+{-# LANGUAGE CPP #-}
+
+module Git.Env where
+
+import Git
+import Utility.Env
+
+{- Adjusts the gitEnv of a Repo. Copies the system environment if the repo
+ - does not have any gitEnv yet. -}
+adjustGitEnv :: Repo -> ([(String, String)] -> [(String, String)]) -> IO Repo
+adjustGitEnv g adj = do
+	e <- maybe copyenv return (gitEnv g)
+	let e' = adj e
+	return $ g { gitEnv = Just e' }
+  where
+	copyenv = do
+#ifdef __ANDROID__
+		{- This should not be necessary on Android, but there is some
+		 - weird getEnvironment breakage. See
+		 - https://github.com/neurocyte/ghc-android/issues/7
+		 - Use getEnv to get some key environment variables that
+		 - git expects to have. -}
+		let keyenv = words "USER PATH GIT_EXEC_PATH HOSTNAME HOME"
+		let getEnvPair k = maybe Nothing (\v -> Just (k, v)) <$> getEnv k
+		catMaybes <$> forM keyenv getEnvPair
+#else
+		getEnvironment
+#endif
+
+addGitEnv :: Repo -> String -> String -> IO Repo
+addGitEnv g var val = adjustGitEnv g (addEntry var val)