76 lines
2.3 KiB
Haskell
76 lines
2.3 KiB
Haskell
{- git index file stuff
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-
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- Copyright 2011-2018 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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import Utility.Env.Set
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indexEnv :: String
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indexEnv = "GIT_INDEX_FILE"
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{- Gets value to set GIT_INDEX_FILE to. Input should be absolute path,
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- or relative to the CWD.
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-
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- When relative, GIT_INDEX_FILE is interpreted by git as being
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- relative to the top of the work tree of the git repository,
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- not to the CWD. Worse, other environment variables (GIT_WORK_TREE)
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- or git options (--work-tree) or configuration (core.worktree)
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- can change what the relative path is interpreted relative to.
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-
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- So, an absolute path is the only safe option for this to return.
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-}
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indexEnvVal :: FilePath -> IO String
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indexEnvVal = absPath
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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 -> Repo -> IO (IO ())
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override index _r = do
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res <- getEnv var
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val <- indexEnvVal index
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setEnv var val 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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{- The normal index file. Does not check GIT_INDEX_FILE. -}
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indexFile :: Repo -> FilePath
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indexFile r = localGitDir r </> "index"
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{- The index file git will currently use, checking GIT_INDEX_FILE. -}
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currentIndexFile :: Repo -> IO FilePath
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currentIndexFile r = fromMaybe (indexFile r) <$> getEnv indexEnv
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{- Git locks the index by creating this file. -}
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indexFileLock :: FilePath -> FilePath
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indexFileLock f = f ++ ".lock"
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{- When the pre-commit hook is run, and git commit has been run with
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- a file or files specified to commit, rather than committing the staged
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- index, git provides the pre-commit hook with a "false index file".
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-
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- Changes made to this index will influence the commit, but won't
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- affect the real index file.
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-
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- This detects when we're in this situation, using a heuristic, which
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- might be broken by changes to git. Any use of this should have a test
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- case to make sure it works.
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-}
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haveFalseIndex :: IO Bool
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haveFalseIndex = maybe (False) check <$> getEnv indexEnv
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where
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check f = "next-index" `isPrefixOf` takeFileName f
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