91 lines
3 KiB
Haskell
91 lines
3 KiB
Haskell
{- git-annex assistant pairing remote creation
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-
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- Copyright 2012 Joey Hess <joey@kitenet.net>
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-
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- Licensed under the GNU GPL version 3 or higher.
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-}
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module Assistant.Pairing.MakeRemote where
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import Assistant.Common
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import Assistant.Ssh
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import Assistant.Pairing
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import Assistant.Pairing.Network
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import Assistant.MakeRemote
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import Config.Cost
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import Network.Socket
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import qualified Data.Text as T
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{- Authorized keys are set up before pairing is complete, so that the other
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- side can immediately begin syncing. -}
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setupAuthorizedKeys :: PairMsg -> FilePath -> IO ()
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setupAuthorizedKeys msg repodir = do
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validateSshPubKey pubkey
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unlessM (liftIO $ addAuthorizedKeys False repodir pubkey) $
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error "failed setting up ssh authorized keys"
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where
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pubkey = remoteSshPubKey $ pairMsgData msg
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{- When local pairing is complete, this is used to set up the remote for
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- the host we paired with. -}
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finishedLocalPairing :: PairMsg -> SshKeyPair -> Assistant ()
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finishedLocalPairing msg keypair = do
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sshdata <- liftIO $ setupSshKeyPair keypair =<< pairMsgToSshData msg
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{- Ensure that we know the ssh host key for the host we paired with.
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- If we don't, ssh over to get it. -}
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liftIO $ unlessM (knownHost $ sshHostName sshdata) $
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void $ sshTranscript
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[ sshOpt "StrictHostKeyChecking" "no"
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, sshOpt "NumberOfPasswordPrompts" "0"
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, "-n"
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, genSshHost (sshHostName sshdata) (sshUserName sshdata)
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, "git-annex-shell -c configlist " ++ T.unpack (sshDirectory sshdata)
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]
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Nothing
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void $ makeSshRemote False sshdata (Just semiExpensiveRemoteCost)
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{- Mostly a straightforward conversion. Except:
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- * Determine the best hostname to use to contact the host.
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- * Strip leading ~/ from the directory name.
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-}
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pairMsgToSshData :: PairMsg -> IO SshData
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pairMsgToSshData msg = do
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let d = pairMsgData msg
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hostname <- liftIO $ bestHostName msg
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let dir = case remoteDirectory d of
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('~':'/':v) -> v
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v -> v
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return SshData
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{ sshHostName = T.pack hostname
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, sshUserName = Just (T.pack $ remoteUserName d)
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, sshDirectory = T.pack dir
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, sshRepoName = genSshRepoName hostname dir
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, sshPort = 22
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, needsPubKey = True
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, rsyncOnly = False
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}
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{- Finds the best hostname to use for the host that sent the PairMsg.
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-
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- If remoteHostName is set, tries to use a .local address based on it.
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- That's the most robust, if this system supports .local.
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- Otherwise, looks up the hostname in the DNS for the remoteAddress,
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- if any. May fall back to remoteAddress if there's no DNS. Ugh. -}
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bestHostName :: PairMsg -> IO HostName
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bestHostName msg = case remoteHostName $ pairMsgData msg of
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Just h -> do
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let localname = h ++ ".local"
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addrs <- catchDefaultIO [] $
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getAddrInfo Nothing (Just localname) Nothing
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maybe fallback (const $ return localname) (headMaybe addrs)
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Nothing -> fallback
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where
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fallback = do
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let a = pairMsgAddr msg
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let sockaddr = case a of
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IPv4Addr addr -> SockAddrInet (PortNum 0) addr
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IPv6Addr addr -> SockAddrInet6 (PortNum 0) 0 addr 0
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fromMaybe (showAddr a)
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<$> catchDefaultIO Nothing
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(fst <$> getNameInfo [] True False sockaddr)
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