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