getting files via http working!

Annex.hs

@@ -14,6 +14,7 @@ module Annex (
 
 import System.Posix.Files
 import System.Directory
+import Data.String.Utils
 import GitRepo
 import Utility
 import Locations
@@ -23,9 +24,14 @@ import UUID
 import LocationLog
 import Types
 
-{- An annexed file's content is stored somewhere under .git/annex/ -}
+{- An annexed file's content is stored somewhere under .git/annex/,
+ - based on the key. Since the symlink is user-visible, the filename
+ - used should be as close to the key as possible, in case the key is a
+ - filename or url. Just escape "/" in the key name, to keep a flat
+ - tree of files and avoid issues with files ending with "/" etc. -}
 annexLocation :: GitRepo -> Key -> FilePath
-annexLocation repo key = gitDir repo ++ "/annex/" ++ key
+annexLocation repo key = gitDir repo ++ "/annex/" ++ (transform key)
+	where transform s = replace "/" "%" $ replace "%" "%%" s
 
 {- On startup, examine the git repo, prepare it, and record state for
  - later. -}

Backend.hs

@@ -102,7 +102,7 @@ lookupKey state backend file = do
 	k <- readFile (backendFile state backend file)
 	return $ chomp k
 	where
-		chomp s = if (endswith s "\n")
+		chomp s = if (endswith "\n" s)
 				then (reverse . (drop 1) . reverse) s
 				else s
 

BackendUrl.hs

@@ -3,6 +3,8 @@
 
 module BackendUrl (backend) where
 
+import System.Posix.Process
+import IO
 import Types
 
 backend = Backend {
@@ -17,11 +19,16 @@ backend = Backend {
 keyValue :: State -> FilePath -> IO (Maybe Key)
 keyValue repo file = return Nothing
 
--- cannot change urls
+-- cannot change url contents
 dummyStore :: State -> FilePath -> Key -> IO Bool
 dummyStore repo file url = return False
 dummyRemove :: State -> Key -> IO Bool
 dummyRemove state url = return False
 
 downloadUrl :: State -> Key -> FilePath -> IO Bool
-downloadUrl state url file = error "downloadUrl unimplemented"
+downloadUrl state url file = do
+	putStrLn $ "download: " ++ url
+	result <- try $ executeFile "curl" True ["-o", file, url] Nothing
+	case (result) of
+		Left _ -> return False
+		Right _ -> return True