summaryrefslogtreecommitdiff
path: root/Remote/Hook.hs
blob: 03976fc70913fa0117ec641c5ed98dc81e0ba639 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
{- A remote that provides hooks to run shell commands.
 -
 - Copyright 2011 Joey Hess <joey@kitenet.net>
 -
 - Licensed under the GNU GPL version 3 or higher.
 -}

module Remote.Hook (remote) where

import qualified Data.ByteString.Lazy.Char8 as L
import qualified Data.Map as M
import System.Exit

import Common.Annex
import Types.Remote
import qualified Git
import Config
import Annex.Content
import Remote.Helper.Special
import Remote.Helper.Encryptable
import Crypto

remote :: RemoteType Annex
remote = RemoteType {
	typename = "hook",
	enumerate = findSpecialRemotes "hooktype",
	generate = gen,
	setup = hookSetup
}

gen :: Git.Repo -> UUID -> Maybe RemoteConfig -> Annex (Remote Annex)
gen r u c = do
	hooktype <- getConfig r "hooktype" (error "missing hooktype")
	cst <- remoteCost r expensiveRemoteCost
	return $ encryptableRemote c
		(storeEncrypted hooktype)
		(retrieveEncrypted hooktype)
		Remote {
			uuid = u,
			cost = cst,
			name = Git.repoDescribe r,
 			storeKey = store hooktype,
			retrieveKeyFile = retrieve hooktype,
			removeKey = remove hooktype,
			hasKey = checkPresent r hooktype,
			hasKeyCheap = False,
			config = Nothing,
			repo = r
		}

hookSetup :: UUID -> RemoteConfig -> Annex RemoteConfig
hookSetup u c = do
	let hooktype = fromMaybe (error "Specify hooktype=") $
		M.lookup "hooktype" c
	c' <- encryptionSetup c
	gitConfigSpecialRemote u c' "hooktype" hooktype
	return c'

hookEnv :: Key -> Maybe FilePath -> Maybe [(String, String)]
hookEnv k f = Just $ fileenv f ++ keyenv
	where
		env s v = ("ANNEX_" ++ s, v)
		keyenv =
			[ env "KEY" (show k)
			, env "HASH_1" hash_1
			, env "HASH_2" hash_2
			]
		fileenv Nothing = []
		fileenv (Just file) =  [env "FILE" file]
		[hash_1, hash_2, _rest] =
			map takeDirectory $ splitPath $ hashDirMixed k

lookupHook :: String -> String -> Annex (Maybe String)
lookupHook hooktype hook =do
	g <- gitRepo
	command <- getConfig g hookname ""
	if null command
		then do
			warning $ "missing configuration for " ++ hookname
			return Nothing
		else return $ Just command
	where
		hookname =  hooktype ++ "-" ++ hook ++ "-hook"

runHook :: String -> String -> Key -> Maybe FilePath -> Annex Bool -> Annex Bool
runHook hooktype hook k f a = maybe (return False) run =<< lookupHook hooktype hook
	where
		run command = do
			showOutput -- make way for hook output
			res <- liftIO $ boolSystemEnv
				"sh" [Param "-c", Param command] $ hookEnv k f
			if res
				then a
				else do
					warning $ hook ++ " hook exited nonzero!"
					return res

store :: String -> Key -> Annex Bool
store h k = do
	src <- fromRepo $ gitAnnexLocation k
	runHook h "store" k (Just src) $ return True

storeEncrypted :: String -> (Cipher, Key) -> Key -> Annex Bool
storeEncrypted h (cipher, enck) k = withTmp enck $ \tmp -> do
	src <- fromRepo $ gitAnnexLocation k
	liftIO $ withEncryptedContent cipher (L.readFile src) $ L.writeFile tmp
	runHook h "store" enck (Just tmp) $ return True

retrieve :: String -> Key -> FilePath -> Annex Bool
retrieve h k f = runHook h "retrieve" k (Just f) $ return True

retrieveEncrypted :: String -> (Cipher, Key) -> FilePath -> Annex Bool
retrieveEncrypted h (cipher, enck) f = withTmp enck $ \tmp ->
	runHook h "retrieve" enck (Just tmp) $ liftIO $ catchBoolIO $ do
		withDecryptedContent cipher (L.readFile tmp) $ L.writeFile f
		return True

remove :: String -> Key -> Annex Bool
remove h k = runHook h "remove" k Nothing $ return True

checkPresent :: Git.Repo -> String -> Key -> Annex (Either String Bool)
checkPresent r h k = do
	showAction $ "checking " ++ Git.repoDescribe r
	v <- lookupHook h "checkpresent"
	liftIO $ catchMsgIO $ check v
	where
		findkey s = show k `elem` lines s
		env = hookEnv k Nothing
		check Nothing = error "checkpresent hook misconfigured"
		check (Just hook) = do
			(frompipe, topipe) <- createPipe
			pid <- forkProcess $ do
				_ <- dupTo topipe stdOutput
				closeFd frompipe
				executeFile "sh" True ["-c", hook] env
			closeFd topipe
			fromh <- fdToHandle frompipe
			reply <- hGetContentsStrict fromh
			hClose fromh
			s <- getProcessStatus True False pid
			case s of
				Just (Exited ExitSuccess) -> return $ findkey reply
				_ -> error "checkpresent hook failed"