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|
{- git repository handling
-
- This is written to be completely independant of git-annex and should be
- suitable for other uses.
-
- Copyright 2010-2012 Joey Hess <id@joeyh.name>
-
- Licensed under the GNU GPL version 3 or higher.
-}
{-# LANGUAGE CPP #-}
module Git (
Repo(..),
Ref(..),
fromRef,
Branch,
Sha,
Tag,
repoIsUrl,
repoIsSsh,
repoIsHttp,
repoIsLocal,
repoIsLocalBare,
repoIsLocalUnknown,
repoDescribe,
repoLocation,
repoPath,
localGitDir,
attributes,
attributesLocal,
hookPath,
assertLocal,
adjustPath,
relPath,
) where
import Network.URI (uriPath, uriScheme, unEscapeString)
#ifndef mingw32_HOST_OS
import System.Posix.Files
#endif
import Common
import Git.Types
#ifndef mingw32_HOST_OS
import Utility.FileMode
#endif
{- User-visible description of a git repo. -}
repoDescribe :: Repo -> String
repoDescribe Repo { remoteName = Just name } = name
repoDescribe Repo { location = Url url } = show url
repoDescribe Repo { location = Local { worktree = Just dir } } = dir
repoDescribe Repo { location = Local { gitdir = dir } } = dir
repoDescribe Repo { location = LocalUnknown dir } = dir
repoDescribe Repo { location = Unknown } = "UNKNOWN"
{- Location of the repo, either as a path or url. -}
repoLocation :: Repo -> String
repoLocation Repo { location = Url url } = show url
repoLocation Repo { location = Local { worktree = Just dir } } = dir
repoLocation Repo { location = Local { gitdir = dir } } = dir
repoLocation Repo { location = LocalUnknown dir } = dir
repoLocation Repo { location = Unknown } = error "unknown repoLocation"
{- Path to a repository. For non-bare, this is the worktree, for bare,
- it's the gitdir, and for URL repositories, is the path on the remote
- host. -}
repoPath :: Repo -> FilePath
repoPath Repo { location = Url u } = unEscapeString $ uriPath u
repoPath Repo { location = Local { worktree = Just d } } = d
repoPath Repo { location = Local { gitdir = d } } = d
repoPath Repo { location = LocalUnknown dir } = dir
repoPath Repo { location = Unknown } = error "unknown repoPath"
{- Path to a local repository's .git directory. -}
localGitDir :: Repo -> FilePath
localGitDir Repo { location = Local { gitdir = d } } = d
localGitDir _ = error "unknown localGitDir"
{- Some code needs to vary between URL and normal repos,
- or bare and non-bare, these functions help with that. -}
repoIsUrl :: Repo -> Bool
repoIsUrl Repo { location = Url _ } = True
repoIsUrl _ = False
repoIsSsh :: Repo -> Bool
repoIsSsh Repo { location = Url url }
| scheme == "ssh:" = True
-- git treats these the same as ssh
| scheme == "git+ssh:" = True
| scheme == "ssh+git:" = True
| otherwise = False
where
scheme = uriScheme url
repoIsSsh _ = False
repoIsHttp :: Repo -> Bool
repoIsHttp Repo { location = Url url }
| uriScheme url == "http:" = True
| uriScheme url == "https:" = True
| otherwise = False
repoIsHttp _ = False
repoIsLocal :: Repo -> Bool
repoIsLocal Repo { location = Local { } } = True
repoIsLocal _ = False
repoIsLocalBare :: Repo -> Bool
repoIsLocalBare Repo { location = Local { worktree = Nothing } } = True
repoIsLocalBare _ = False
repoIsLocalUnknown :: Repo -> Bool
repoIsLocalUnknown Repo { location = LocalUnknown { } } = True
repoIsLocalUnknown _ = False
assertLocal :: Repo -> a -> a
assertLocal repo action
| repoIsUrl repo = error $ unwords
[ "acting on non-local git repo"
, repoDescribe repo
, "not supported"
]
| otherwise = action
{- Path to a repository's gitattributes file. -}
attributes :: Repo -> FilePath
attributes repo
| repoIsLocalBare repo = attributesLocal repo
| otherwise = repoPath repo </> ".gitattributes"
attributesLocal :: Repo -> FilePath
attributesLocal repo = localGitDir repo </> "info" </> "attributes"
{- Path to a given hook script in a repository, only if the hook exists
- and is executable. -}
hookPath :: String -> Repo -> IO (Maybe FilePath)
hookPath script repo = do
let hook = localGitDir repo </> "hooks" </> script
ifM (catchBoolIO $ isexecutable hook)
( return $ Just hook , return Nothing )
where
#if mingw32_HOST_OS
isexecutable f = doesFileExist f
#else
isexecutable f = isExecutable . fileMode <$> getFileStatus f
#endif
{- Makes the path to a local Repo be relative to the cwd. -}
relPath :: Repo -> IO Repo
relPath = adjustPath torel
where
torel p = do
p' <- relPathCwdToFile p
if null p'
then return "."
else return p'
{- Adusts the path to a local Repo using the provided function. -}
adjustPath :: (FilePath -> IO FilePath) -> Repo -> IO Repo
adjustPath f r@(Repo { location = l@(Local { gitdir = d, worktree = w }) }) = do
d' <- f d
w' <- maybe (pure Nothing) (Just <$$> f) w
return $ r
{ location = l
{ gitdir = d'
, worktree = w'
}
}
adjustPath f r@(Repo { location = LocalUnknown d }) = do
d' <- f d
return $ r { location = LocalUnknown d' }
adjustPath _ r = pure r
|
