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
|
{- git-annex uuids
-
- Each git repository used by git-annex has an annex.uuid setting that
- uniquely identifies that repository.
-
- UUIDs of remotes are cached in git config, using keys named
- remote.<name>.annex-uuid
-
- Copyright 2010 Joey Hess <joey@kitenet.net>
-
- Licensed under the GNU GPL version 3 or higher.
-}
module UUID (
UUID,
getUUID,
getUncachedUUID,
prepUUID,
genUUID,
describeUUID,
uuidMap,
uuidLog
) where
import qualified Data.Map as M
import Common.Annex
import qualified Git
import qualified Annex.Branch
import Types.UUID
import qualified Build.SysConfig as SysConfig
import Config
configkey :: String
configkey = "annex.uuid"
{- Filename of uuid.log. -}
uuidLog :: FilePath
uuidLog = "uuid.log"
{- Generates a UUID. There is a library for this, but it's not packaged,
- so use the command line tool. -}
genUUID :: IO UUID
genUUID = liftIO $ pOpen ReadFromPipe command params $ \h -> hGetLine h
where
command = SysConfig.uuid
params = if command == "uuid"
-- request a random uuid be generated
then ["-m"]
-- uuidgen generates random uuid by default
else []
{- Looks up a repo's UUID. May return "" if none is known.
-}
getUUID :: Git.Repo -> Annex UUID
getUUID r = do
g <- gitRepo
let c = cached g
let u = getUncachedUUID r
if c /= u && u /= ""
then do
updatecache g u
return u
else return c
where
cached g = Git.configGet g cachekey ""
updatecache g u = when (g /= r) $ setConfig cachekey u
cachekey = "remote." ++ fromMaybe "" (Git.repoRemoteName r) ++ ".annex-uuid"
getUncachedUUID :: Git.Repo -> UUID
getUncachedUUID r = Git.configGet r configkey ""
{- Make sure that the repo has an annex.uuid setting. -}
prepUUID :: Annex ()
prepUUID = do
u <- getUUID =<< gitRepo
when ("" == u) $ do
uuid <- liftIO genUUID
setConfig configkey uuid
{- Records a description for a uuid in the uuidLog. -}
describeUUID :: UUID -> String -> Annex ()
describeUUID uuid desc = Annex.Branch.change uuidLog $
serialize . M.insert uuid desc . parse
where
serialize m = unlines $ map (\(u, d) -> u++" "++d) $ M.toList m
{- Read the uuidLog into a Map -}
uuidMap :: Annex (M.Map UUID String)
uuidMap = parse <$> Annex.Branch.get uuidLog
parse :: String -> M.Map UUID String
parse = M.fromList . map pair . lines
where
pair l
| null ws = ("", "")
| otherwise = (head ws, unwords $ drop 1 ws)
where
ws = words l
|
