add "unused" preferred content expression
With a really nice optimisation that keeps it from having any overhead in normal operation! This commit was sponsored by Ulises Vitulli.
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7 changed files with 41 additions and 13 deletions
3
Annex.hs
3
Annex.hs
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@ -46,6 +46,7 @@ import Git.CheckAttr
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import Git.CheckIgnore
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import Git.SharedRepository
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import qualified Git.Queue
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import Types.Key
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import Types.Backend
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import Types.GitConfig
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import qualified Types.Remote
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@ -112,6 +113,7 @@ data AnnexState = AnnexState
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, inodeschanged :: Maybe Bool
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, useragent :: Maybe String
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, errcounter :: Integer
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, unusedkeys :: Maybe (S.Set Key)
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}
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newState :: GitConfig -> Git.Repo -> AnnexState
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@ -148,6 +150,7 @@ newState c r = AnnexState
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, inodeschanged = Nothing
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, useragent = Nothing
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, errcounter = 0
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, unusedkeys = Nothing
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}
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{- Makes an Annex state object for the specified git repo.
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@ -65,6 +65,7 @@ parseToken checkpresent checkpreferreddir groupmap t
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| t `elem` tokens = Right $ token t
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| t == "present" = use checkpresent
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| t == "inpreferreddir" = use checkpreferreddir
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| t == "unused" = Right (Operation limitUnused)
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| otherwise = maybe (Left $ "near " ++ show t) use $ M.lookup k $
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M.fromList
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[ ("include", limitInclude)
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10
Limit.hs
10
Limit.hs
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@ -30,6 +30,7 @@ import Types.Group
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import Types.FileMatcher
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import Types.Limit
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import Logs.Group
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import Logs.Unused
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import Utility.HumanTime
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import Utility.DataUnits
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@ -199,6 +200,15 @@ limitLackingCopies approx want = case readish want of
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return $ numcopies - length us >= needed
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approxNumCopies = fromMaybe defaultNumCopies <$> getGlobalNumCopies
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{- Match keys that are unused.
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-
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- This has a nice optimisation: When a file exists,
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- its key is obviously not unused.
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-}
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limitUnused :: MatchFiles
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limitUnused _ (MatchingFile _) = return False
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limitUnused _ (MatchingKey k) = S.member k <$> unusedKeys
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{- Adds a limit to skip files not believed to be present in all
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- repositories in the specified group. -}
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addInAllGroup :: String -> Annex ()
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@ -21,14 +21,17 @@ module Logs.Unused (
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readUnusedLog,
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readUnusedMap,
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unusedKeys,
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unusedKeys'
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) where
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import qualified Data.Map as M
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import qualified Data.Set as S
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import Data.Time.Clock.POSIX
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import Data.Time
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import System.Locale
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import Common.Annex
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import qualified Annex
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import Types.Key
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import Utility.Tmp
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@ -84,5 +87,16 @@ readUnusedLog prefix = do
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readUnusedMap :: FilePath -> Annex UnusedMap
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readUnusedMap = log2map <$$> readUnusedLog
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unusedKeys :: Annex [Key]
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unusedKeys = M.keys <$> readUnusedLog ""
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{- Set of unused keys. This is cached for speed. -}
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unusedKeys :: Annex (S.Set Key)
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unusedKeys = maybe (setUnusedKeys =<< unusedKeys') return
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=<< Annex.getState Annex.unusedkeys
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unusedKeys' :: Annex [Key]
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unusedKeys' = M.keys <$> readUnusedLog ""
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setUnusedKeys :: [Key] -> Annex (S.Set Key)
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setUnusedKeys ks = do
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let v = S.fromList ks
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Annex.changeState $ \s -> s { Annex.unusedkeys = Just v }
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return v
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4
Seek.hs
4
Seek.hs
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@ -133,9 +133,9 @@ withKeyOptions keyop fallbackop params = do
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auto <- Annex.getState Annex.auto
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case (allkeys || bare , unused, auto ) of
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(True , False , False) -> go loggedKeys
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(False , True , False) -> go unusedKeys
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(False , True , False) -> go unusedKeys'
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(True , True , _ )
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| bare && not allkeys -> go unusedKeys
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| bare && not allkeys -> go unusedKeys'
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| otherwise -> error "Cannot use --all with --unused."
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(False , False , _ ) -> fallbackop params
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(_ , _ , True )
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3
debian/changelog
vendored
3
debian/changelog
vendored
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@ -14,7 +14,8 @@ git-annex (5.20140118) UNRELEASED; urgency=medium
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command is used to set the global number of copies, any annex.numcopies
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git configs will be ignored.
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* assistant: Make the prefs page set the global numcopies.
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* Add lackingcopies and approxlackingcopies preferred content expressions.
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* Add lackingcopies, approxlackingcopies, and unused to
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preferred content expressions.
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* Client, transfer, incremental backup, and archive repositories
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now want to get content that does not yet have enough copies.
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* repair: Check git version at run time.
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@ -39,17 +39,16 @@ Finally, how to specify a feature request for git-annex?
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> So, let's spec out a design.
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>
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> * Add preferred content terminal to configure whether a repository wants
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> to hang on to unused content.
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> Something like "unused=true" I suppose, because not having a parameter
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> would complicate preferred content parsing, and I cannot think
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> of a useful parameter. (It cannot be a timestamp, because there's
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> no way repos can agree on about when a key became unused.)
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> to hang on to unused content. Simply `unused`.
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> (It cannot include a timestamp, because there's
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> no way repos can agree on about when a key became unused.) **done**
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> * In order to quickly match that terminal, the Annex monad will need
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> to keep a Set of unused Keys. This should only be loaded on demand.
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> **done**
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> NB: There is some potential for a great many unused Keys to cause
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> memory usage to balloon.
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> * Client repositories will end their preferred content with
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> `and unused=false`. Transfer repositories too, because typically
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> `and (not unused)`. Transfer repositories too, because typically
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> only client repos connect to them, and so otherwise unused files
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> would build up there. Backup repos would want unused files. I
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> think that archive repos would too.
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@ -90,7 +89,7 @@ Finally, how to specify a feature request for git-annex?
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> client directly edits it, or deletes it, it loses the old version,
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> but the other client will still be storing that old version.
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>
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> ## Stability analysis for unused= in preferred content expressions
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> ## Stability analysis for unused in preferred content expressions
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>
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> This is tricky, because two repos that are otherwise entirely
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> in sync may have differing opinons about whether a key is unused,
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