295 lines
8.4 KiB
Haskell
295 lines
8.4 KiB
Haskell
{- git repository handling
|
|
-
|
|
- This is written to be completely independant of git-annex and should be
|
|
- suitable for other uses.
|
|
-
|
|
-}
|
|
|
|
module GitRepo (
|
|
Repo,
|
|
repoFromCwd,
|
|
repoFromPath,
|
|
repoFromUrl,
|
|
repoIsUrl,
|
|
repoIsSsh,
|
|
repoDescribe,
|
|
workTree,
|
|
dir,
|
|
relative,
|
|
urlPath,
|
|
urlHost,
|
|
configGet,
|
|
configMap,
|
|
configRead,
|
|
run,
|
|
pipeRead,
|
|
attributes,
|
|
remotes,
|
|
remotesAdd,
|
|
repoRemoteName,
|
|
inRepo,
|
|
notInRepo
|
|
) where
|
|
|
|
import Directory
|
|
import System
|
|
import System.Directory
|
|
import System.Posix.Directory
|
|
import System.Path
|
|
import System.Cmd
|
|
import System.Cmd.Utils
|
|
import System.IO
|
|
import IO (bracket_)
|
|
import Data.String.Utils
|
|
import Data.Map as Map hiding (map, split)
|
|
import Network.URI
|
|
import Maybe
|
|
|
|
import Utility
|
|
|
|
{- There are two types of repositories; those on local disk and those
|
|
- accessed via an URL. -}
|
|
data Repo =
|
|
Repo {
|
|
top :: FilePath,
|
|
config :: Map String String,
|
|
remotes :: [Repo],
|
|
-- remoteName holds the name used for this repo in remotes
|
|
remoteName :: Maybe String
|
|
} | UrlRepo {
|
|
url :: URI,
|
|
config :: Map String String,
|
|
remotes :: [Repo],
|
|
remoteName :: Maybe String
|
|
} deriving (Show, Eq)
|
|
|
|
{- Local Repo constructor. -}
|
|
repoFromPath :: FilePath -> Repo
|
|
repoFromPath dir =
|
|
Repo {
|
|
top = dir,
|
|
config = Map.empty,
|
|
remotes = [],
|
|
remoteName = Nothing
|
|
}
|
|
|
|
{- Remote Repo constructor. Throws exception on invalid url. -}
|
|
repoFromUrl :: String -> Repo
|
|
repoFromUrl url =
|
|
UrlRepo {
|
|
url = fromJust $ parseURI url,
|
|
config = Map.empty,
|
|
remotes = [],
|
|
remoteName = Nothing
|
|
}
|
|
|
|
{- User-visible description of a git repo. -}
|
|
repoDescribe repo =
|
|
if (isJust $ remoteName repo)
|
|
then fromJust $ remoteName repo
|
|
else if (not $ repoIsUrl repo)
|
|
then top repo
|
|
else show (url repo)
|
|
|
|
{- Constructs and returns an updated version of a repo with
|
|
- different remotes list. -}
|
|
remotesAdd :: Repo -> [Repo] -> Repo
|
|
remotesAdd repo rs = repo { remotes = rs }
|
|
|
|
{- Returns the name of the remote that corresponds to the repo, if
|
|
- it is a remote. Otherwise, "" -}
|
|
repoRemoteName r =
|
|
if (isJust $ remoteName r)
|
|
then fromJust $ remoteName r
|
|
else ""
|
|
|
|
{- Some code needs to vary between URL and normal repos,
|
|
- or bare and non-bare, these functions help with that. -}
|
|
repoIsUrl repo = case (repo) of
|
|
UrlRepo {} -> True
|
|
Repo {} -> False
|
|
repoIsSsh repo = repoIsUrl repo && (uriScheme $ url repo) == "ssh:"
|
|
assertLocal repo action =
|
|
if (not $ repoIsUrl repo)
|
|
then action
|
|
else error $ "acting on URL git repo " ++ (repoDescribe repo) ++
|
|
" not supported"
|
|
assertUrl repo action =
|
|
if (repoIsUrl repo)
|
|
then action
|
|
else error $ "acting on local git repo " ++ (repoDescribe repo) ++
|
|
" not supported"
|
|
assertssh repo action =
|
|
if (repoIsSsh repo)
|
|
then action
|
|
else error $ "unsupported url " ++ (show $ url repo)
|
|
bare :: Repo -> Bool
|
|
bare repo =
|
|
if (member b (config repo))
|
|
then ("true" == fromJust (Map.lookup b (config repo)))
|
|
else error $ "it is not known if git repo " ++ (repoDescribe repo) ++
|
|
" is a bare repository; config not read"
|
|
where
|
|
b = "core.bare"
|
|
|
|
{- Path to a repository's gitattributes file. -}
|
|
attributes :: Repo -> String
|
|
attributes repo = assertLocal repo $ do
|
|
if (bare repo)
|
|
then (top repo) ++ "/info/.gitattributes"
|
|
else (top repo) ++ "/.gitattributes"
|
|
|
|
{- Path to a repository's .git directory, relative to its workTree. -}
|
|
dir :: Repo -> String
|
|
dir repo = if (bare repo) then "" else ".git"
|
|
|
|
{- Path to a repository's --work-tree, that is, its top.
|
|
-
|
|
- Note that for URL repositories, this is relative to the urlHost -}
|
|
workTree :: Repo -> FilePath
|
|
workTree repo =
|
|
if (not $ repoIsUrl repo)
|
|
then top repo
|
|
else urlPath repo
|
|
|
|
{- Given a relative or absolute filename in a repository, calculates the
|
|
- name to use to refer to the file relative to a git repository's top.
|
|
- This is the same form displayed and used by git. -}
|
|
relative :: Repo -> String -> String
|
|
relative repo file = drop (length absrepo) absfile
|
|
where
|
|
-- normalize both repo and file, so that repo
|
|
-- will be substring of file
|
|
absrepo = case (absNormPath "/" (top repo)) of
|
|
Just f -> f ++ "/"
|
|
Nothing -> error $ "bad repo" ++ (top repo)
|
|
absfile = case (secureAbsNormPath absrepo file) of
|
|
Just f -> f
|
|
Nothing -> error $ file ++ " is not located inside git repository " ++ absrepo
|
|
|
|
{- Hostname of an URL repo. (May include a username and/or port too.) -}
|
|
urlHost :: Repo -> String
|
|
urlHost repo = assertUrl repo $
|
|
(uriUserInfo a) ++ (uriRegName a) ++ (uriPort a)
|
|
where
|
|
a = fromJust $ uriAuthority $ url repo
|
|
|
|
{- Path of an URL repo. -}
|
|
urlPath :: Repo -> String
|
|
urlPath repo = assertUrl repo $
|
|
uriPath $ url repo
|
|
|
|
{- Constructs a git command line operating on the specified repo. -}
|
|
gitCommandLine :: Repo -> [String] -> [String]
|
|
gitCommandLine repo params = assertLocal repo $
|
|
-- force use of specified repo via --git-dir and --work-tree
|
|
["--git-dir="++(top repo)++"/"++(dir repo), "--work-tree="++(top repo)] ++ params
|
|
|
|
{- Runs git in the specified repo. -}
|
|
run :: Repo -> [String] -> IO ()
|
|
run repo params = assertLocal repo $ do
|
|
r <- safeSystem "git" (gitCommandLine repo params)
|
|
return ()
|
|
|
|
{- Runs a git subcommand and returns its output. -}
|
|
pipeRead :: Repo -> [String] -> IO String
|
|
pipeRead repo params = assertLocal repo $ do
|
|
pOpen ReadFromPipe "git" (gitCommandLine repo params) $ \h -> do
|
|
ret <- hGetContentsStrict h
|
|
return ret
|
|
|
|
{- Passed a location, recursively scans for all files that
|
|
- are checked into git at that location. -}
|
|
inRepo :: Repo -> FilePath -> IO [FilePath]
|
|
inRepo repo location = do
|
|
s <- pipeRead repo ["ls-files", "--cached", "--exclude-standard", location]
|
|
return $ lines s
|
|
|
|
{- Passed a location, recursively scans for all files that are not checked
|
|
- into git, and not gitignored. -}
|
|
notInRepo :: Repo -> FilePath -> IO [FilePath]
|
|
notInRepo repo location = do
|
|
s <- pipeRead repo ["ls-files", "--others", "--exclude-standard", location]
|
|
return $ lines s
|
|
|
|
{- Runs git config and populates a repo with its config. -}
|
|
configRead :: Repo -> IO Repo
|
|
configRead repo =
|
|
if (not $ repoIsUrl repo)
|
|
then do
|
|
{- Cannot use pipeRead because it relies on the config having
|
|
been already read. Instead, chdir to the repo. -}
|
|
cwd <- getCurrentDirectory
|
|
bracket_ (changeWorkingDirectory (top repo))
|
|
(\_ -> changeWorkingDirectory cwd) $
|
|
pOpen ReadFromPipe "git" ["config", "--list"] proc
|
|
else assertssh repo $ do
|
|
pOpen ReadFromPipe "ssh" [urlHost repo, sshcommand] proc
|
|
where
|
|
sshcommand = "cd " ++ (shellEscape $ urlPath repo) ++ " && git config --list"
|
|
proc h = do
|
|
val <- hGetContentsStrict h
|
|
let r = repo { config = configParse val }
|
|
return r { remotes = configRemotes r }
|
|
|
|
{- Calculates a list of a repo's configured remotes, by parsing its config. -}
|
|
configRemotes :: Repo -> [Repo]
|
|
configRemotes repo = map construct remotes
|
|
where
|
|
remotes = toList $ filter $ config repo
|
|
filter = filterWithKey (\k _ -> isremote k)
|
|
isremote k = (startswith "remote." k) && (endswith ".url" k)
|
|
remotename k = (split "." k) !! 1
|
|
construct (k,v) = (gen v) { remoteName = Just $ remotename k }
|
|
gen v = if (isURI v)
|
|
then repoFromUrl v
|
|
else repoFromPath v
|
|
|
|
{- Parses git config --list output into a config map. -}
|
|
configParse :: String -> Map.Map String String
|
|
configParse s = Map.fromList $ map pair $ lines s
|
|
where
|
|
pair l = (key l, val l)
|
|
key l = (keyval l) !! 0
|
|
val l = join sep $ drop 1 $ keyval l
|
|
keyval l = split sep l :: [String]
|
|
sep = "="
|
|
|
|
{- Returns a single git config setting, or a default value if not set. -}
|
|
configGet :: Repo -> String -> String -> String
|
|
configGet repo key defaultValue =
|
|
Map.findWithDefault defaultValue key (config repo)
|
|
|
|
{- Access to raw config Map -}
|
|
configMap :: Repo -> Map String String
|
|
configMap repo = config repo
|
|
|
|
{- Finds the current git repository, which may be in a parent directory. -}
|
|
repoFromCwd :: IO Repo
|
|
repoFromCwd = do
|
|
cwd <- getCurrentDirectory
|
|
top <- seekUp cwd isRepoTop
|
|
case top of
|
|
(Just dir) -> return $ repoFromPath dir
|
|
Nothing -> error "Not in a git repository."
|
|
|
|
seekUp :: String -> (String -> IO Bool) -> IO (Maybe String)
|
|
seekUp dir want = do
|
|
ok <- want dir
|
|
if ok
|
|
then return (Just dir)
|
|
else case (parentDir dir) of
|
|
"" -> return Nothing
|
|
d -> seekUp d want
|
|
|
|
isRepoTop dir = do
|
|
r <- isRepo dir
|
|
b <- isBareRepo dir
|
|
return (r || b)
|
|
where
|
|
isRepo dir = gitSignature dir ".git" ".git/config"
|
|
isBareRepo dir = gitSignature dir "objects" "config"
|
|
gitSignature dir subdir file = do
|
|
s <- (doesDirectoryExist (dir ++ "/" ++ subdir))
|
|
f <- (doesFileExist (dir ++ "/" ++ file))
|
|
return (s && f)
|