152 lines
4.7 KiB
Haskell
152 lines
4.7 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 AGPL version 3 or higher.
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-}
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module Build.LinuxMkLibs (mklibs) where
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import Data.Maybe
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import System.FilePath
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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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mklibs :: FilePath -> a -> IO Bool
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mklibs top _installedbins = do
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fs <- dirContentsRecursive top
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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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let (linkers, otherlibs) = partition ("ld-linux" `isInfixOf`) libs'
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libdirs <- nub . catMaybes <$> mapM (installLib installFile top) otherlibs
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libdirs' <- consolidateUsrLib top libdirs
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gconvlibs <- gconvLibs
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mapM_ (installLib installFile top) gconvlibs
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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") (parentDir $ Prelude.head gconvlibs)
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mapM_ (installLib installFile top) linkers
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let linker = Prelude.head linkers
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mapM_ (installLinkerShim top linker) exes
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return (any hwcaplibdir libdirs)
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where
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-- hwcap lib dirs are things like foo/tls and foo/x86.
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-- Hard to know if a directory is, so this is a heuristic
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-- looking for things that are certianly not. If this heuristic
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-- fails, a minor optimisation will not happen, but there will be
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-- no bad results.
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hwcaplibdir d = not $ or
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[ "lib" == takeFileName d
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-- eg, "lib/x86_64-linux-gnu"
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, "-linux-" `isInfixOf` takeFileName d
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]
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{- If there are two libdirs that are the same except one is in
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- usr/lib and the other is in lib/, move the contents of the usr/lib one
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- into the lib/ one. This reduces the number of directories the linker
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- needs to look in, and so reduces the number of failed stats
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- and improves startup time.
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-}
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consolidateUsrLib :: FilePath -> [FilePath] -> IO [FilePath]
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consolidateUsrLib top libdirs = map reverse <$> go [] (map reverse libdirs)
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where
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go c [] = return c
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go c (x:[]) = return (x:c)
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go c (x:y:rest)
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| x == y ++ reverse ("/usr") = do
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let x' = reverse x
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let y' = reverse y
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fs <- getDirectoryContents (inTop top x')
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forM_ fs $ \f ->
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unless (dirCruft f) $
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renameFile
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(inTop top (x' </> f))
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(inTop top (y' </> f))
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go (y:c) rest
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| otherwise = do
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print (x,y)
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go (x:c) (y:rest)
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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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ifM (isSymbolicLink <$> getSymbolicLinkStatus exe)
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( do
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sl <- readSymbolicLink exe
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nukeFile exe
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nukeFile exedest
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-- Assume that for a symlink, the destination
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-- will also be shimmed.
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let sl' = ".." </> takeFileName sl </> takeFileName sl
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createSymbolicLink sl' exedest
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, renameFile exe exedest
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)
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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=\"$0\""
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, "export GIT_ANNEX_PROGRAMPATH"
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, "exec \"$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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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" ["-L", 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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