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
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
|
{- git-annex-shell main program
-
- Copyright 2010-2012 Joey Hess <joey@kitenet.net>
-
- Licensed under the GNU GPL version 3 or higher.
-}
module CmdLine.GitAnnexShell where
import System.Environment
import System.Console.GetOpt
import Common.Annex
import qualified Git.Construct
import CmdLine
import Command
import Annex.UUID
import Annex (setField)
import CmdLine.GitAnnexShell.Fields
import Utility.UserInfo
import Remote.GCrypt (getGCryptUUID)
import qualified Annex
import Annex.Init
import qualified Command.ConfigList
import qualified Command.InAnnex
import qualified Command.DropKey
import qualified Command.RecvKey
import qualified Command.SendKey
import qualified Command.TransferInfo
import qualified Command.Commit
import qualified Command.NotifyChanges
import qualified Command.GCryptSetup
cmds_readonly :: [Command]
cmds_readonly = concat
[ gitAnnexShellCheck Command.ConfigList.cmd
, gitAnnexShellCheck Command.InAnnex.cmd
, gitAnnexShellCheck Command.SendKey.cmd
, gitAnnexShellCheck Command.TransferInfo.cmd
, gitAnnexShellCheck Command.NotifyChanges.cmd
]
cmds_notreadonly :: [Command]
cmds_notreadonly = concat
[ gitAnnexShellCheck Command.RecvKey.cmd
, gitAnnexShellCheck Command.DropKey.cmd
, gitAnnexShellCheck Command.Commit.cmd
, Command.GCryptSetup.cmd
]
cmds :: [Command]
cmds = map adddirparam $ cmds_readonly ++ cmds_notreadonly
where
adddirparam c = c { cmdparamdesc = "DIRECTORY " ++ cmdparamdesc c }
options :: [OptDescr (Annex ())]
options = commonOptions ++
[ Option [] ["uuid"] (ReqArg checkUUID paramUUID) "local repository uuid"
]
where
checkUUID expected = getUUID >>= check
where
check u | u == toUUID expected = noop
check NoUUID = checkGCryptUUID expected
check u = unexpectedUUID expected u
checkGCryptUUID expected = check =<< getGCryptUUID True =<< gitRepo
where
check (Just u) | u == toUUID expected = noop
check Nothing = unexpected expected "uninitialized repository"
check (Just u) = unexpectedUUID expected u
unexpectedUUID expected u = unexpected expected $ "UUID " ++ fromUUID u
unexpected expected s = error $
"expected repository UUID " ++ expected ++ " but found " ++ s
header :: String
header = "git-annex-shell [-c] command [parameters ...] [option ...]"
run :: [String] -> IO ()
run [] = failure
-- skip leading -c options, passed by eg, ssh
run ("-c":p) = run p
-- a command can be either a builtin or something to pass to git-shell
run c@(cmd:dir:params)
| cmd `elem` builtins = builtin cmd dir params
| otherwise = external c
run c@(cmd:_)
-- Handle the case of being the user's login shell. It will be passed
-- a single string containing all the real parameters.
| "git-annex-shell " `isPrefixOf` cmd = run $ drop 1 $ shellUnEscape cmd
| cmd `elem` builtins = failure
| otherwise = external c
builtins :: [String]
builtins = map cmdname cmds
builtin :: String -> String -> [String] -> IO ()
builtin cmd dir params = do
checkNotReadOnly cmd
checkDirectory $ Just dir
let (params', fieldparams, opts) = partitionParams params
fields = filter checkField $ parseFields fieldparams
cmds' = map (newcmd $ unwords opts) cmds
dispatch False (cmd : params') cmds' options fields header $
Git.Construct.repoAbsPath dir >>= Git.Construct.fromAbsPath
where
addrsyncopts opts seek k = setField "RsyncOptions" opts >> seek k
newcmd opts c = c { cmdseek = addrsyncopts opts (cmdseek c) }
external :: [String] -> IO ()
external params = do
{- Normal git-shell commands all have the directory as their last
- parameter. -}
let lastparam = lastMaybe =<< shellUnEscape <$> lastMaybe params
(params', _, _) = partitionParams params
checkDirectory lastparam
checkNotLimited
unlessM (boolSystem "git-shell" $ map Param $ "-c":params') $
error "git-shell failed"
{- Split the input list into 3 groups separated with a double dash --.
- Parameters between two -- markers are field settings, in the form:
- field=value field=value
-
- Parameters after the last -- are the command itself and its arguments e.g.,
- rsync --bandwidth=100.
-}
partitionParams :: [String] -> ([String], [String], [String])
partitionParams ps = case segment (== "--") ps of
params:fieldparams:rest -> ( params, fieldparams, intercalate ["--"] rest )
[params] -> (params, [], [])
_ -> ([], [], [])
parseFields :: [String] -> [(String, String)]
parseFields = map (separate (== '='))
{- Only allow known fields to be set, ignore others.
- Make sure that field values make sense. -}
checkField :: (String, String) -> Bool
checkField (field, value)
| field == fieldName remoteUUID = fieldCheck remoteUUID value
| field == fieldName associatedFile = fieldCheck associatedFile value
| field == fieldName direct = fieldCheck direct value
| otherwise = False
failure :: IO ()
failure = error $ "bad parameters\n\n" ++ usage header cmds
checkNotLimited :: IO ()
checkNotLimited = checkEnv "GIT_ANNEX_SHELL_LIMITED"
checkNotReadOnly :: String -> IO ()
checkNotReadOnly cmd
| cmd `elem` map cmdname cmds_readonly = noop
| otherwise = checkEnv "GIT_ANNEX_SHELL_READONLY"
checkDirectory :: Maybe FilePath -> IO ()
checkDirectory mdir = do
v <- catchMaybeIO $ getEnv "GIT_ANNEX_SHELL_DIRECTORY"
case (v, mdir) of
(Nothing, _) -> noop
(Just d, Nothing) -> req d Nothing
(Just d, Just dir)
| d `equalFilePath` dir -> noop
| otherwise -> do
home <- myHomeDir
d' <- canondir home d
dir' <- canondir home dir
if d' `equalFilePath` dir'
then noop
else req d' (Just dir')
where
req d mdir' = error $ unwords
[ "Only allowed to access"
, d
, maybe "and could not determine directory from command line" ("not " ++) mdir'
]
{- A directory may start with ~/ or in some cases, even /~/,
- or could just be relative to home, or of course could
- be absolute. -}
canondir home d
| "~/" `isPrefixOf` d = return d
| "/~/" `isPrefixOf` d = return $ drop 1 d
| otherwise = relHome $ absPathFrom home d
checkEnv :: String -> IO ()
checkEnv var = do
v <- catchMaybeIO $ getEnv var
case v of
Nothing -> noop
Just "" -> noop
Just _ -> error $ "Action blocked by " ++ var
{- Modifies a Command to check that it is run in either a git-annex
- repository, or a repository with a gcrypt-id set. -}
gitAnnexShellCheck :: [Command] -> [Command]
gitAnnexShellCheck = map $ addCheck okforshell . dontCheck repoExists
where
okforshell = unlessM (isInitialized <||> isJust . gcryptId <$> Annex.getGitConfig) $
error "Not a git-annex or gcrypt repository."
|
