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module FilenameDescr where
import Data.Char
import Data.Either
import Data.List
import BuildInfo
import Utils
import Tar
-- We can't just compare plain filenames, because versions numbers of GHC
-- and the libraries will vary. So we use FilenameDescr instead, which
-- abstracts out the version numbers.
type FilenameDescr = [FilenameDescrBit]
data FilenameDescrBit = VersionOf String
| HashOf String
| FP String
| Ways
deriving (Show, Eq, Ord)
normaliseDescr :: FilenameDescr -> FilenameDescr
normaliseDescr [] = []
normaliseDescr [x] = [x]
normaliseDescr (FP x1 : FP x2 : xs) = normaliseDescr (FP (x1 ++ x2) : xs)
normaliseDescr (x : xs) = x : normaliseDescr xs
-- Sanity check that the FilenameDescr matches the filename in the tar line
checkContent :: BuildInfo -> (FilenameDescr, TarLine) -> Errors
checkContent buildInfo (fd, tl)
= let fn = tlFileName tl
in case flattenFilenameDescr buildInfo fd of
Right fn' ->
if fn' == fn
then []
else if all isAscii fn
then ["checkContent: Can't happen: filename mismatch: "
++ show fn]
else [] -- Ugly kludge; don't worry too much if filepaths
-- containing non-ASCII chars have gone wrong
Left errs ->
errs
flattenFilenameDescr :: BuildInfo -> FilenameDescr
-> Either Errors FilePath
flattenFilenameDescr buildInfo fd = case partitionEithers (map f fd) of
([], strs) -> Right (concat strs)
(errs, _) -> Left (concat errs)
where f (FP fp) = Right fp
f (VersionOf thing)
= case lookup thing (biThingVersionMap buildInfo) of
Just v -> Right v
Nothing -> Left ["Can't happen: thing has no version in mapping"]
f (HashOf thing)
= case lookup thing (biThingHashMap buildInfo) of
Just v -> Right v
Nothing -> Left ["Can't happen: thing has no hash in mapping"]
f Ways = case biMaybeWays buildInfo of
Just ways -> Right $ intercalate "-" ways
Nothing -> Left ["Can't happen: No ways, but Ways is used"]
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