129 lines
3.7 KiB
Haskell
129 lines
3.7 KiB
Haskell
{- Linux library copier and binary shimmer
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-
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- Copyright 2013 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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{-# LANGUAGE CPP #-}
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module Main where
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import System.Environment
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import Data.Maybe
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import System.FilePath
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import System.Directory
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import Control.Monad
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import Data.List
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import System.Posix.Files
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import Control.Monad.IfElse
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import Control.Applicative
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import Prelude
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import Utility.LinuxMkLibs
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import Utility.Directory
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import Utility.Process
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import Utility.Monad
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import Utility.Path
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import Utility.FileMode
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import Utility.CopyFile
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main :: IO ()
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main = getArgs >>= go
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where
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go [] = error "specify LINUXSTANDALONE_DIST"
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go (top:_) = mklibs top
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mklibs :: FilePath -> IO ()
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mklibs top = do
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fs <- dirContentsRecursive top
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mapM_ symToHardLink fs
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exes <- filterM checkExe fs
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libs <- parseLdd <$> readProcess "ldd" exes
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glibclibs <- glibcLibs
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let libs' = nub $ libs ++ glibclibs
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libdirs <- nub . catMaybes <$> mapM (installLib installFile top) libs'
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-- Various files used by runshell to set up env vars used by the
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-- linker shims.
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writeFile (top </> "libdirs") (unlines libdirs)
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writeFile (top </> "gconvdir")
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(parentDir $ Prelude.head $ filter ("/gconv/" `isInfixOf`) glibclibs)
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let linker = Prelude.head $ filter ("ld-linux" `isInfixOf`) libs'
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mapM_ (installLinkerShim top linker) exes
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{- Installs a linker shim script around a binary.
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-
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- Note that each binary is put into its own separate directory,
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- to avoid eg git looking for binaries in its directory rather
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- than in PATH.
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-
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- The linker is symlinked to a file with the same basename as the binary,
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- since that looks better in ps than "ld-linux.so".
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-}
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installLinkerShim :: FilePath -> FilePath -> FilePath -> IO ()
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installLinkerShim top linker exe = do
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createDirectoryIfMissing True (top </> shimdir)
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createDirectoryIfMissing True (top </> exedir)
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renameFile exe exedest
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link <- relPathDirToFile (top </> exedir) (top ++ linker)
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unlessM (doesFileExist (top </> exelink)) $
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createSymbolicLink link (top </> exelink)
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writeFile exe $ unlines
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[ "#!/bin/sh"
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, "GIT_ANNEX_PROGRAMPATH=\"$0\""
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, "export GIT_ANNEX_PROGRAMPATH"
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#ifdef MIN_VERSION_GLASGOW_HASKELL
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#if ! MIN_VERSION_GLASGOW_HASKELL(7,10,0,0)
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#define NEED_LOCPATH_WORKAROUND
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#endif
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#else
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#define NEED_LOCPATH_WORKAROUND
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#endif
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#ifdef NEED_LOCPATH_WORKAROUND
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-- workaround for https://ghc.haskell.org/trac/ghc/ticket/7695
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, "LOCPATH=/dev/null"
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, "export LOCPATH"
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#endif
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, "exec \"$GIT_ANNEX_DIR/" ++ exelink ++ "\" --library-path \"$GIT_ANNEX_LD_LIBRARY_PATH\" \"$GIT_ANNEX_DIR/shimmed/" ++ base ++ "/" ++ base ++ "\" \"$@\""
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]
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modifyFileMode exe $ addModes executeModes
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where
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base = takeFileName exe
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shimdir = "shimmed" </> base
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exedir = "exe"
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exedest = top </> shimdir </> base
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exelink = exedir </> base
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{- Converting symlinks to hard links simplifies the binary shimming
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- process. -}
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symToHardLink :: FilePath -> IO ()
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symToHardLink f = whenM (isSymbolicLink <$> getSymbolicLinkStatus f) $ do
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l <- readSymbolicLink f
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let absl = absPathFrom (parentDir f) l
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nukeFile f
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createLink absl f
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installFile :: FilePath -> FilePath -> IO ()
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installFile top f = do
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createDirectoryIfMissing True destdir
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void $ copyFileExternal CopyTimeStamps f destdir
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where
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destdir = inTop top $ parentDir f
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checkExe :: FilePath -> IO Bool
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checkExe f
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| ".so" `isSuffixOf` f = return False
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| otherwise = ifM (isExecutable . fileMode <$> getFileStatus f)
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( checkFileExe <$> readProcess "file" [f]
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, return False
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)
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{- Check that file(1) thinks it's a Linux ELF executable, or possibly
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- a shared library (a few executables like ssh appear as shared libraries). -}
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checkFileExe :: String -> Bool
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checkFileExe s = and
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[ "ELF" `isInfixOf` s
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, "executable" `isInfixOf` s || "shared object" `isInfixOf` s
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]
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