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|
{- The current git repository.
-
- Copyright 2012-2022 Joey Hess <id@joeyh.name>
-
- Licensed under the GNU AGPL version 3 or higher.
-}
{-# LANGUAGE OverloadedStrings #-}
module Git.CurrentRepo where
import Common
import Git
import Git.Types
import Git.Construct
import qualified Git.Config
import Utility.Env
import Utility.Env.Set
import qualified Utility.RawFilePath as R
import qualified Data.ByteString as B
import qualified System.FilePath.ByteString as P
{- Gets the current git repository.
-
- Honors GIT_DIR and GIT_WORK_TREE.
- Both environment variables are unset, to avoid confusing other git
- commands that also look at them. Instead, the Git module passes
- --work-tree and --git-dir to git commands it runs.
-
- When GIT_WORK_TREE or core.worktree are set, changes the working
- directory if necessary to ensure it is within the repository's work
- tree. While not needed for git commands, this is useful for anything
- else that looks for files in the worktree.
-
- Also works around a git bug when running some hooks. It
- runs the hooks in the top of the repository, but if GIT_WORK_TREE
- was relative (but not "."), it then points to the wrong directory.
- In this situation GIT_PREFIX contains the directory that
- GIT_WORK_TREE is relative to.
-}
get :: IO Repo
get = do
gd <- getpathenv "GIT_DIR"
r <- configure gd =<< fromCwd
prefix <- getpathenv "GIT_PREFIX"
wt <- maybe (worktree (location r)) Just
<$> getpathenvprefix "GIT_WORK_TREE" prefix
case wt of
Nothing -> relPath r
Just d -> do
curr <- R.getCurrentDirectory
unless (d `dirContains` curr) $
setCurrentDirectory (fromRawFilePath d)
relPath $ addworktree wt r
where
getpathenv s = do
v <- getEnv s
case v of
Just d -> do
unsetEnv s
return (Just (toRawFilePath d))
Nothing -> return Nothing
getpathenvprefix s (Just prefix) | not (B.null prefix) =
getpathenv s >>= \case
Nothing -> return Nothing
Just d
| d == "." -> return (Just d)
| otherwise -> Just
<$> absPath (prefix P.</> d)
getpathenvprefix s _ = getpathenv s
configure Nothing (Just r) = Git.Config.read r
configure (Just d) _ = do
absd <- absPath d
curr <- R.getCurrentDirectory
loc <- adjustGitDirFile $ Local
{ gitdir = absd
, worktree = Just curr
}
r <- Git.Config.read $ (newFrom loc)
{ gitDirSpecifiedExplicitly = True }
return $ if fromMaybe False (Git.Config.isBare r)
then r { location = (location r) { worktree = Nothing } }
else r
configure Nothing Nothing = giveup "Not in a git repository."
addworktree w r = changelocation r $ Local
{ gitdir = gitdir (location r)
, worktree = w
}
changelocation r l = r { location = l }
|
