From 7c12f0ac9224246dac308e837bccb5b2157062ee Mon Sep 17 00:00:00 2001
From: Joey Hess <id@joeyh.name>
Date: Tue, 15 Dec 2015 17:47:59 -0700
Subject: Import git-repair_1.20151215.orig.tar.xz

[dgit import orig git-repair_1.20151215.orig.tar.xz]
---
 Git/Index.hs | 55 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 55 insertions(+)
 create mode 100644 Git/Index.hs

(limited to 'Git/Index.hs')

diff --git a/Git/Index.hs b/Git/Index.hs
new file mode 100644
index 0000000..551fd98
--- /dev/null
+++ b/Git/Index.hs
@@ -0,0 +1,55 @@
+{- git index file stuff
+ -
+ - Copyright 2011 Joey Hess <id@joeyh.name>
+ -
+ - Licensed under the GNU GPL version 3 or higher.
+ -}
+
+module Git.Index where
+
+import Common
+import Git
+import Utility.Env
+
+indexEnv :: String
+indexEnv = "GIT_INDEX_FILE"
+
+{- Forces git to use the specified index file.
+ -
+ - Returns an action that will reset back to the default
+ - index file.
+ -
+ - Warning: Not thread safe.
+ -}
+override :: FilePath -> IO (IO ())
+override index = do
+	res <- getEnv var
+	setEnv var index True
+	return $ reset res
+  where
+	var = "GIT_INDEX_FILE"
+	reset (Just v) = setEnv indexEnv v True
+	reset _ = unsetEnv var
+
+indexFile :: Repo -> FilePath
+indexFile r = localGitDir r </> "index"
+
+{- Git locks the index by creating this file. -}
+indexFileLock :: Repo -> FilePath
+indexFileLock r = indexFile r ++ ".lock"
+
+{- When the pre-commit hook is run, and git commit has been run with
+ - a file or files specified to commit, rather than committing the staged
+ - index, git provides the pre-commit hook with a "false index file".
+ -
+ - Changes made to this index will influence the commit, but won't
+ - affect the real index file.
+ -
+ - This detects when we're in this situation, using a heuristic, which
+ - might be broken by changes to git. Any use of this should have a test
+ - case to make sure it works.
+ -}
+haveFalseIndex :: IO Bool
+haveFalseIndex = maybe (False) check <$> getEnv indexEnv
+  where
+	check f = "next-index" `isPrefixOf` takeFileName f
-- 
cgit v1.2.3