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|
{- git-annex remote access with ssh
-
- Copyright 2011 Joey Hess <joey@kitenet.net>
-
- Licensed under the GNU GPL version 3 or higher.
-}
module Utility.Ssh where
import Control.Monad.State (liftIO)
import qualified Git
import Utility
import Types
import Config
{- Generates parameters to ssh to a repository's host and run a command.
- Caller is responsible for doing any neccessary shellEscaping of the
- passed command. -}
sshToRepo :: Git.Repo -> [CommandParam] -> Annex [CommandParam]
sshToRepo repo sshcmd = do
s <- getConfig repo "ssh-options" ""
let sshoptions = map Param (words s)
let sshport = case Git.urlPort repo of
Nothing -> []
Just p -> [Param "-p", Param (show p)]
let sshhost = Param $ Git.urlHostUser repo
return $ sshoptions ++ sshport ++ [sshhost] ++ sshcmd
{- Generates parameters to run a git-annex-shell command on a remote
- repository. -}
git_annex_shell :: Git.Repo -> String -> [CommandParam] -> Annex (Maybe (FilePath, [CommandParam]))
git_annex_shell r command params
| not $ Git.repoIsUrl r = return $ Just (shellcmd, shellopts)
| Git.repoIsSsh r = do
sshparams <- sshToRepo r [Param sshcmd]
return $ Just ("ssh", sshparams)
| otherwise = return Nothing
where
dir = Git.workTree r
shellcmd = "git-annex-shell"
shellopts = Param command : File dir : params
sshcmd = shellcmd ++ " " ++
unwords (map shellEscape $ toCommand shellopts)
{- Uses a supplied function (such as boolSystem) to run a git-annex-shell
- command on a remote.
-
- Or, if the remote does not support running remote commands, returns
- a specified error value. -}
onRemote
:: Git.Repo
-> (FilePath -> [CommandParam] -> IO a, a)
-> String
-> [CommandParam]
-> Annex a
onRemote r (with, errorval) command params = do
s <- git_annex_shell r command params
case s of
Just (c, ps) -> liftIO $ with c ps
Nothing -> return errorval
|
