summaryrefslogtreecommitdiff
path: root/Remote/Hook.hs
blob: 338d95ce7ae172c7c95d241f1eb0650d540063e6 (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
144
145
146
147
148
149
150
151
152
153
154
155
{- 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 as L
import qualified Data.Map as M
import System.Environment

import Common.Annex
import Types.Remote
import Types.Key
import qualified Git
import Config
import Config.Cost
import Annex.Content
import Remote.Helper.Special
import Remote.Helper.Encryptable
import Crypto
import Utility.Metered

type Action = String
type HookName = String

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

gen :: Git.Repo -> UUID -> RemoteConfig -> RemoteGitConfig -> Annex Remote
gen r u c gc = do
	cst <- remoteCost gc expensiveRemoteCost
	return $ encryptableRemote c
		(storeEncrypted hooktype $ getGpgEncParams (c,gc))
		(retrieveEncrypted hooktype)
		Remote {
			uuid = u,
			cost = cst,
			name = Git.repoDescribe r,
			storeKey = store hooktype,
			retrieveKeyFile = retrieve hooktype,
			retrieveKeyFileCheap = retrieveCheap hooktype,
			removeKey = remove hooktype,
			hasKey = checkPresent r hooktype,
			hasKeyCheap = False,
			whereisKey = Nothing,
			config = M.empty,
			localpath = Nothing,
			repo = r,
			gitconfig = gc,
			readonly = False,
			globallyAvailable = False,
			remotetype = remote
		}
  where
	hooktype = fromMaybe (error "missing hooktype") $ remoteAnnexHookType gc	

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 :: Action -> Key -> Maybe FilePath -> IO (Maybe [(String, String)])
hookEnv action k f = Just <$> mergeenv (fileenv f ++ keyenv)
  where
	mergeenv l = M.toList . M.union (M.fromList l) 
		<$> M.fromList <$> getEnvironment
	env s v = ("ANNEX_" ++ s, v)
	keyenv = catMaybes
		[ Just $ env "KEY" (key2file k)
		, Just $ env "ACTION" action
		, env "HASH_1" <$> headMaybe hashbits
		, env "HASH_2" <$> headMaybe (drop 1 hashbits)
		]
	fileenv Nothing = []
	fileenv (Just file) =  [env "FILE" file]
	hashbits = map takeDirectory $ splitPath $ hashDirMixed k

lookupHook :: HookName -> Action -> Annex (Maybe String)
lookupHook hookname action = do
	command <- getConfig (annexConfig hook) ""
	if null command
		then do
			fallback <- getConfig (annexConfig $ hookfallback) ""
			if null fallback
				then do
					warning $ "missing configuration for " ++ hook ++ " or " ++ hookfallback
					return Nothing
				else return $ Just fallback
		else return $ Just command
  where
	hook = hookname ++ "-" ++ action ++ "-hook"
	hookfallback = hookname ++ "-hook"

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

store :: HookName -> Key -> AssociatedFile -> MeterUpdate -> Annex Bool
store h k _f _p = sendAnnex k (void $ remove h k) $ \src ->
	runHook h "store" k (Just src) $ return True

storeEncrypted :: HookName -> [CommandParam] -> (Cipher, Key) -> Key -> MeterUpdate -> Annex Bool
storeEncrypted h gpgOpts (cipher, enck) k _p = withTmp enck $ \tmp ->
	sendAnnex k (void $ remove h enck) $ \src -> do
		liftIO $ encrypt gpgOpts cipher (feedFile src) $
			readBytes $ L.writeFile tmp
		runHook h "store" enck (Just tmp) $ return True

retrieve :: HookName -> Key -> AssociatedFile -> FilePath -> MeterUpdate -> Annex Bool
retrieve h k _f d _p = runHook h "retrieve" k (Just d) $ return True

retrieveCheap :: HookName -> Key -> FilePath -> Annex Bool
retrieveCheap _ _ _ = return False

retrieveEncrypted :: HookName -> (Cipher, Key) -> Key -> FilePath -> MeterUpdate -> Annex Bool
retrieveEncrypted h (cipher, enck) _ f _p = withTmp enck $ \tmp ->
	runHook h "retrieve" enck (Just tmp) $ liftIO $ catchBoolIO $ do
		decrypt cipher (feedFile tmp) $
			readBytes $ L.writeFile f
		return True

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

checkPresent :: Git.Repo -> HookName -> Key -> Annex (Either String Bool)
checkPresent r h k = do
	showAction $ "checking " ++ Git.repoDescribe r
	v <- lookupHook h action
	liftIO $ catchMsgIO $ check v
  where
  	action = "checkpresent"
	findkey s = key2file k `elem` lines s
	check Nothing = error $ action ++ " hook misconfigured"
	check (Just hook) = do
		env <- hookEnv action k Nothing
		findkey <$> readProcessEnv "sh" ["-c", hook] env