blob: 15ea32401a8a83b56d4568f58bbba6d06c29213a (
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
|
{- git-annex transitions log
-
- This is used to record transitions that have been performed on the
- git-annex branch, and when the transition was first started.
-
- We can quickly detect when the local branch has already had an transition
- done that is listed in the remote branch by checking that the local
- branch contains the same transition, with the same or newer start time.
-
- Copyright 2013 Joey Hess <joey@kitenet.net>
-
- Licensed under the GNU GPL version 3 or higher.
-}
module Logs.Transitions where
import Data.Time.Clock.POSIX
import Data.Time
import System.Locale
import qualified Data.Set as S
import Common.Annex
transitionsLog :: FilePath
transitionsLog = "transitions.log"
data Transition
= ForgetGitHistory
| ForgetDeadRemotes
deriving (Show, Ord, Eq, Read)
data TransitionLine = TransitionLine
{ transitionStarted :: POSIXTime
, transition :: Transition
} deriving (Show, Ord, Eq)
type Transitions = S.Set TransitionLine
describeTransition :: Transition -> String
describeTransition ForgetGitHistory = "forget git history"
describeTransition ForgetDeadRemotes = "forget dead remotes"
noTransitions :: Transitions
noTransitions = S.empty
addTransition :: POSIXTime -> Transition -> Transitions -> Transitions
addTransition ts t = S.insert $ TransitionLine ts t
showTransitions :: Transitions -> String
showTransitions = unlines . map showTransitionLine . S.elems
{- If the log contains new transitions we don't support, returns Nothing. -}
parseTransitions :: String -> Maybe Transitions
parseTransitions = check . map parseTransitionLine . lines
where
check l
| all isJust l = Just $ S.fromList $ catMaybes l
| otherwise = Nothing
parseTransitionsStrictly :: String -> String -> Transitions
parseTransitionsStrictly source = fromMaybe badsource . parseTransitions
where
badsource = error $ "unknown transitions listed in " ++ source ++ "; upgrade git-annex!"
showTransitionLine :: TransitionLine -> String
showTransitionLine (TransitionLine ts t) = unwords [show t, show ts]
parseTransitionLine :: String -> Maybe TransitionLine
parseTransitionLine s = TransitionLine <$> pdate ds <*> readish ts
where
ws = words s
ts = Prelude.head ws
ds = unwords $ Prelude.tail ws
pdate = utcTimeToPOSIXSeconds <$$> parseTime defaultTimeLocale "%s%Qs"
combineTransitions :: [Transitions] -> Transitions
combineTransitions = S.unions
transitionList :: Transitions -> [Transition]
transitionList = map transition . S.elems
{- Typically ran with Annex.Branch.change, but we can't import Annex.Branch
- here since it depends on this module. -}
recordTransitions :: (FilePath -> (String -> String) -> Annex ()) -> Transitions -> Annex ()
recordTransitions changer t = changer transitionsLog $
showTransitions . S.union t . parseTransitionsStrictly "local"
|
