propellor/Propellor/Property/Docker/Shim.hs

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-- | Support for running propellor, as built outside a docker container,
-- inside the container.
--
-- Note: This is currently Debian specific, due to glibcLibs.
module Propellor.Property.Docker.Shim (setup, file) where
import Propellor
import Utility.LinuxMkLibs
import Utility.SafeCommand
import Utility.Path
import Utility.FileMode
import Data.List
import System.Posix.Files
-- | Sets up a shimmed version of the program, in a directory, and
-- returns its path.
setup :: FilePath -> FilePath -> IO FilePath
setup propellorbin dest = do
createDirectoryIfMissing True dest
libs <- parseLdd <$> readProcess "ldd" [propellorbin]
glibclibs <- glibcLibs
let libs' = nub $ libs ++ glibclibs
libdirs <- map (dest ++) . nub . catMaybes
<$> mapM (installLib installFile dest) libs'
let linker = (dest ++) $
fromMaybe (error "cannot find ld-linux linker") $
headMaybe $ filter ("ld-linux" `isInfixOf`) libs'
let linkerparams = ["--library-path", intercalate ":" libdirs ]
let shim = file propellorbin dest
writeFile shim $ unlines
[ "#!/bin/sh"
, "exec " ++ unwords (map shellEscape $ linker : linkerparams) ++
" " ++ shellEscape propellorbin ++ " \"$@\""
]
modifyFileMode shim (addModes executeModes)
return shim
file :: FilePath -> FilePath -> FilePath
file propellorbin dest = dest </> propellorbin
installFile :: FilePath -> FilePath -> IO ()
installFile top f = do
createDirectoryIfMissing True destdir
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nukeFile dest
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createLink f dest `catchIO` (const copy)
where
copy = void $ boolSystem "cp" [Param "-a", Param f, Param dest]
destdir = inTop top $ parentDir f
dest = inTop top f