treat "not present" in preferred content as invalid
Detect when a preferred content expression contains "not present", which would lead to repeatedly getting and then dropping files, and make it never match. This also applies to "not balanced" and "not sizebalanced". --explain will tell the user when this happens Note that getMatcher calls matchMrun' and does not check for unstable negated limits. While there is no --present anyway, if there was, it would not make sense for --not --present to complain about instability and fail to match.
This commit is contained in:
Joey Hess
parent
8b2bd42540
commit
340bdd0dac
8 changed files with 121 additions and 47 deletions
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@ -95,10 +95,26 @@ checkMatcher' (matcher, (MatcherDesc matcherdesc)) mi lu notpresent =
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go = do
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(matches, desc) <- runWriterT $ matchMrun' matcher $ \op ->
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matchAction op lu notpresent mi
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explain (mkActionItem mi) $ UnquotedString <$>
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describeMatchResult matchDesc desc
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((if matches then "matches " else "does not match ") ++ matcherdesc ++ ": ")
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return matches
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let descmsg = UnquotedString <$>
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describeMatchResult
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(\o -> matchDesc o . Just) desc
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((if matches then "matches " else "does not match ") ++ matcherdesc ++ ": ")
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let unstablenegated = filter matchNegationUnstable (findNegated matcher)
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if null unstablenegated
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then do
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explain (mkActionItem mi) descmsg
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return matches
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else do
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let s = concat
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[ ", but that expression is not stable due to negated use of "
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, unwords $ nub $
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map (fromMatchDesc . flip matchDesc Nothing)
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unstablenegated
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, ", so will not be used"
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]
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explain (mkActionItem mi) $ Just $
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fromMaybe mempty descmsg <> UnquotedString s
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return False
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fileMatchInfo :: RawFilePath -> Maybe Key -> Annex MatchInfo
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fileMatchInfo file mkey = do
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@ -282,6 +298,7 @@ call desc (Right sub) = Right $ Operation $ MatchFiles
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, matchNeedsKey = any matchNeedsKey sub
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, matchNeedsLocationLog = any matchNeedsLocationLog sub
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, matchNeedsLiveRepoSize = any matchNeedsLiveRepoSize sub
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, matchNegationUnstable = any matchNegationUnstable sub
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, matchDesc = matchDescSimple desc
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}
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call _ (Left err) = Left err
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@ -1,6 +1,10 @@
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git-annex (10.20240832) UNRELEASED; urgency=medium
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* Fix --debug display of onlyingroup preferred content expression.
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* Detect when a preferred content expression contains "not present",
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which would lead to repeatedly getting and then dropping files,
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and make it never match. This also applies to
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"not balanced" and "not sizebalanced".
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* Fix --explain display of onlyingroup preferred content expression.
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-- Joey Hess <id@joeyh.name> Tue, 03 Sep 2024 12:38:42 -0400
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57
Limit.hs
57
Limit.hs
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@ -69,7 +69,8 @@ getMatcher = run <$> getMatcher'
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Utility.Matcher.matchMrun' matcher $ \o ->
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matchAction o NoLiveUpdate S.empty i
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explain (mkActionItem i) $ UnquotedString <$>
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Utility.Matcher.describeMatchResult matchDesc desc
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Utility.Matcher.describeMatchResult
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(\o -> matchDesc o . Just) desc
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(if match then "matches:" else "does not match:")
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return match
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@ -115,6 +116,7 @@ limitInclude glob = Right $ MatchFiles
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, matchNeedsKey = False
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, matchNeedsLocationLog = False
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, matchNeedsLiveRepoSize = False
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, matchNegationUnstable = False
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, matchDesc = "include" =? glob
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}
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@ -130,6 +132,7 @@ limitExclude glob = Right $ MatchFiles
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, matchNeedsKey = False
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, matchNeedsLocationLog = False
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, matchNeedsLiveRepoSize = False
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, matchNegationUnstable = False
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, matchDesc = "exclude" =? glob
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}
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@ -156,6 +159,7 @@ limitIncludeSameContent glob = Right $ MatchFiles
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, matchNeedsKey = False
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, matchNeedsLocationLog = False
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, matchNeedsLiveRepoSize = False
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, matchNegationUnstable = False
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, matchDesc = "includesamecontent" =? glob
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}
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@ -172,6 +176,7 @@ limitExcludeSameContent glob = Right $ MatchFiles
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, matchNeedsKey = False
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, matchNeedsLocationLog = False
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, matchNeedsLiveRepoSize = False
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, matchNegationUnstable = False
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, matchDesc = "excludesamecontent" =? glob
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}
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@ -249,6 +254,7 @@ matchMagic limitname querymagic selectprovidedinfo selectuserprovidedinfo (Just
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, matchNeedsKey = False
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, matchNeedsLocationLog = False
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, matchNeedsLiveRepoSize = False
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, matchNegationUnstable = False
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, matchDesc = limitname =? glob
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}
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where
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@ -277,6 +283,7 @@ addUnlocked = addLimit $ Right $ MatchFiles
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, matchNeedsKey = False
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, matchNeedsLocationLog = False
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, matchNeedsLiveRepoSize = False
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, matchNegationUnstable = False
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, matchDesc = matchDescSimple "unlocked"
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}
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@ -288,6 +295,7 @@ addLocked = addLimit $ Right $ MatchFiles
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, matchNeedsKey = False
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, matchNeedsLocationLog = False
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, matchNeedsLiveRepoSize = False
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, matchNegationUnstable = False
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, matchDesc = matchDescSimple "locked"
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}
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@ -324,6 +332,7 @@ addIn s = do
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, matchNeedsKey = True
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, matchNeedsLocationLog = not inhere
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, matchNeedsLiveRepoSize = False
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, matchNegationUnstable = False
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, matchDesc = "in" =? s
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}
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checkinuuid u notpresent key
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@ -355,6 +364,7 @@ addExpectedPresent = do
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, matchNeedsKey = True
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, matchNeedsLocationLog = True
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, matchNeedsLiveRepoSize = False
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, matchNegationUnstable = True
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, matchDesc = matchDescSimple "expected-present"
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}
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@ -373,6 +383,7 @@ limitPresent u = MatchFiles
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, matchNeedsKey = True
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, matchNeedsLocationLog = not (isNothing u)
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, matchNeedsLiveRepoSize = False
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, matchNegationUnstable = True
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, matchDesc = matchDescSimple "present"
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}
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@ -385,6 +396,7 @@ limitInDir dir desc = MatchFiles
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, matchNeedsKey = False
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, matchNeedsLocationLog = False
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, matchNeedsLiveRepoSize = False
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, matchNegationUnstable = False
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, matchDesc = matchDescSimple desc
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}
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where
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@ -418,6 +430,7 @@ limitCopies want = case splitc ':' want of
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, matchNeedsKey = True
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, matchNeedsLocationLog = True
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, matchNeedsLiveRepoSize = False
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, matchNegationUnstable = False
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, matchDesc = "copies" =? want
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}
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go' n good notpresent key = do
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@ -444,6 +457,7 @@ limitLackingCopies desc approx want = case readish want of
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, matchNeedsKey = True
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, matchNeedsLocationLog = True
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, matchNeedsLiveRepoSize = False
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, matchNegationUnstable = False
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, matchDesc = matchDescSimple desc
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}
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Nothing -> Left "bad value for number of lacking copies"
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@ -475,6 +489,7 @@ limitUnused = MatchFiles
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, matchNeedsKey = True
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, matchNeedsLocationLog = False
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, matchNeedsLiveRepoSize = False
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, matchNegationUnstable = False
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, matchDesc = matchDescSimple "unused"
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}
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where
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@ -499,6 +514,7 @@ limitAnything = MatchFiles
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, matchNeedsKey = False
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, matchNeedsLocationLog = False
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, matchNeedsLiveRepoSize = False
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, matchNegationUnstable = False
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, matchDesc = matchDescSimple "anything"
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}
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@ -515,6 +531,7 @@ limitNothing = MatchFiles
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, matchNeedsKey = False
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, matchNeedsLocationLog = False
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, matchNeedsLiveRepoSize = False
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, matchNegationUnstable = False
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, matchDesc = matchDescSimple "nothing"
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}
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@ -539,6 +556,7 @@ limitInAllGroup getgroupmap groupname = Right $ MatchFiles
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, matchNeedsKey = True
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, matchNeedsLocationLog = True
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, matchNeedsLiveRepoSize = False
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, matchNegationUnstable = False
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, matchDesc = "inallgroup" =? groupname
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}
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where
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@ -565,6 +583,7 @@ limitOnlyInGroup getgroupmap groupname = Right $ MatchFiles
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, matchNeedsKey = True
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, matchNeedsLocationLog = True
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, matchNeedsLiveRepoSize = False
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, matchNegationUnstable = False
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, matchDesc = "onlyingroup" =? groupname
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}
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where
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@ -585,6 +604,7 @@ limitBalanced' termname fullybalanced mu groupname = do
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then groupname
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else groupname ++ ":1"
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let present = limitPresent mu
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let combo f = f present || f fullybalanced || f copies
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Right $ MatchFiles
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{ matchAction = \lu a i ->
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ifM (Annex.getRead Annex.rebalance)
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@ -594,26 +614,16 @@ limitBalanced' termname fullybalanced mu groupname = do
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<&&> matchAction fullybalanced lu a i
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)
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)
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, matchNeedsFileName =
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matchNeedsFileName present ||
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matchNeedsFileName fullybalanced ||
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matchNeedsFileName copies
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, matchNeedsFileContent =
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matchNeedsFileContent present ||
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matchNeedsFileContent fullybalanced ||
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matchNeedsFileContent copies
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, matchNeedsKey =
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matchNeedsKey present ||
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matchNeedsKey fullybalanced ||
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matchNeedsKey copies
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, matchNeedsLocationLog =
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matchNeedsLocationLog present ||
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matchNeedsLocationLog fullybalanced ||
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matchNeedsLocationLog copies
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, matchNeedsFileName = combo matchNeedsFileName
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, matchNeedsFileContent = combo matchNeedsFileContent
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, matchNeedsKey = combo matchNeedsKey
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, matchNeedsLocationLog = combo matchNeedsLocationLog
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, matchNeedsLiveRepoSize = True
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, matchNegationUnstable = combo matchNegationUnstable
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, matchDesc = termname =? groupname
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}
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limitFullyBalanced :: Maybe UUID -> Annex GroupMap -> MkLimit Annex
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limitFullyBalanced = limitFullyBalanced' "fullybalanced"
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@ -697,6 +707,7 @@ limitFullyBalanced''' filtercandidates termname mu getgroupmap g n want = Right
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, matchNeedsKey = True
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, matchNeedsLocationLog = False
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, matchNeedsLiveRepoSize = True
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, matchNegationUnstable = False
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, matchDesc = termname =? want
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}
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@ -757,6 +768,7 @@ limitInBackend name = Right $ MatchFiles
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, matchNeedsKey = True
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, matchNeedsLocationLog = False
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, matchNeedsLiveRepoSize = False
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, matchNegationUnstable = False
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, matchDesc = "inbackend" =? name
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}
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where
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@ -775,6 +787,7 @@ limitSecureHash = MatchFiles
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, matchNeedsKey = True
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, matchNeedsLocationLog = False
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, matchNeedsLiveRepoSize = False
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, matchNegationUnstable = False
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, matchDesc = matchDescSimple "securehash"
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}
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@ -797,6 +810,7 @@ limitSize lb desc vs s = case readSize dataUnits s of
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, matchNeedsKey = False
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, matchNeedsLocationLog = False
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, matchNeedsLiveRepoSize = False
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, matchNegationUnstable = False
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, matchDesc = desc =? s
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}
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where
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@ -828,6 +842,7 @@ limitMetaData s = case parseMetaDataMatcher s of
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, matchNeedsKey = True
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, matchNeedsLocationLog = False
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, matchNeedsLiveRepoSize = False
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, matchNegationUnstable = False
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, matchDesc = "metadata" =? s
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}
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where
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@ -845,6 +860,7 @@ addAccessedWithin duration = do
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, matchNeedsKey = False
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, matchNeedsLocationLog = False
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, matchNeedsLiveRepoSize = False
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, matchNegationUnstable = False
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, matchDesc = "accessedwithin" =? fromDuration duration
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}
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where
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@ -866,9 +882,10 @@ checkKey a (MatchingFile fi) = lookupFileKey fi >>= maybe (return False) a
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checkKey a (MatchingInfo p) = maybe (return False) a (providedKey p)
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checkKey a (MatchingUserInfo p) = a =<< getUserInfo (userProvidedKey p)
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matchDescSimple :: String -> (Bool -> Utility.Matcher.MatchDesc)
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matchDescSimple s b = Utility.Matcher.MatchDesc $ s ++
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matchDescSimple :: String -> (Maybe Bool -> Utility.Matcher.MatchDesc)
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matchDescSimple s (Just b) = Utility.Matcher.MatchDesc $ s ++
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if b then "[TRUE]" else "[FALSE]"
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matchDescSimple s Nothing = Utility.Matcher.MatchDesc s
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(=?) :: String -> String -> (Bool -> Utility.Matcher.MatchDesc)
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(=?) :: String -> String -> (Maybe Bool -> Utility.Matcher.MatchDesc)
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k =? v = matchDescSimple (k ++ "=" ++ v)
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|
|
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@ -41,6 +41,7 @@ addPreferredContentLimit desc a = do
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nk <- introspectPreferredRequiredContent matchNeedsKey Nothing
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nl <- introspectPreferredRequiredContent matchNeedsLocationLog Nothing
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lsz <- introspectPreferredRequiredContent matchNeedsLiveRepoSize Nothing
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nu <- introspectPreferredRequiredContent matchNegationUnstable Nothing
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addLimit $ Right $ MatchFiles
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{ matchAction = const $ const a
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, matchNeedsFileName = nfn
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@ -48,6 +49,7 @@ addPreferredContentLimit desc a = do
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, matchNeedsKey = nk
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, matchNeedsLocationLog = nl
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, matchNeedsLiveRepoSize = lsz
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, matchNegationUnstable = nu
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, matchDesc = matchDescSimple desc
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}
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|
|
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@ -98,7 +98,9 @@ data MatchFiles a = MatchFiles
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-- ^ does the matchAction look at the location log?
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, matchNeedsLiveRepoSize :: Bool
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-- ^ does the matchAction need live repo size information?
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, matchDesc :: Bool -> MatchDesc
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, matchNegationUnstable :: Bool
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-- ^ does negating the matchAction lead to unstable behavior?
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, matchDesc :: Maybe Bool -> MatchDesc
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-- ^ displayed to the user to describe whether it matched or not
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}
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|
|
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@ -31,6 +31,7 @@ module Utility.Matcher (
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matchMrun,
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matchMrun',
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isEmpty,
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findNegated,
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combineMatchers,
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introspect,
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describeMatchResult,
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@ -54,7 +55,7 @@ data Matcher op = MAny
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| MOp op
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deriving (Show, Eq, Foldable)
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newtype MatchDesc = MatchDesc String
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newtype MatchDesc = MatchDesc { fromMatchDesc :: String }
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data MatchResult op
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= MatchedOperation Bool op
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|
@ -223,6 +224,19 @@ isEmpty :: Matcher a -> Bool
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isEmpty MAny = True
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isEmpty _ = False
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{- Finds terms within the matcher that are negated.
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- Terms that are doubly negated are not returned. -}
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findNegated :: Matcher op -> [op]
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findNegated = go False []
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where
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go _ c MAny = c
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go n c (MAnd a b) = go n (go n c a) b
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go n c (MOr a b) = go n (go n c a) b
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go n c (MNot m) = go (not n) c m
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go n c (MOp o)
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| n = (o:c)
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| otherwise = c
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{- Combines two matchers, yielding a matcher that will match anything
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- both do. But, if one matcher contains no limits, yield the other one. -}
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combineMatchers :: Matcher a -> Matcher a -> Matcher a
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|
|
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|
@ -172,9 +172,11 @@ elsewhere to allow removing it).
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settings from affecting a subdirectory. For example:
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`auto/* or (include=ad-hoc/* and present)`
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|
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Note that `not present` is a very bad thing to put in a preferred content
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expression. It'll make it want to get content that's not present, and
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drop content that is present! Don't go there..
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Note that `not present` is not a reasonable thing to put in a preferred
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content expression. It says to get content that's not present, but then
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drop it! If that somehow gets into a preferred content expression,
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git-annex will recognize that the preferred content expression is not stable,
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and make it never match.
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* `inpreferreddir`
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|
@ -304,8 +306,8 @@ elsewhere to allow removing it).
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a lot of files. When this causes git-annex to do a lot of work, it will
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display "(calculating repository sizes)".
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Note that `not balanced` is a bad thing to put in a preferred content
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expression for the same reason `not present` is.
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Note that `not balanced` not a reasonable thing to use in a preferred
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content expression for the same reasons as `not present`.
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* `fullybalanced=groupname[:number]`
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|
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|
@ -365,6 +367,9 @@ elsewhere to allow removing it).
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will make repositories want to move files around as necessary in order to
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get fully balanced.
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|
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Note that `not sizebalanced` not a reasonable thing to use in a preferred
|
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content expression for the same reasons as `not present`.
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|
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* `fullysizebalanced=groupname:number`
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|
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This is like `sizebalanced`, but allows moving content between repositories
|
||||
|
|
|
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|
|
@ -10,19 +10,17 @@ It would be very handy to provide some way to prove things about behavior
|
|||
of preferred content expressions, or a way to simulate the behavior of a
|
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network of git-annex repositories with a given preferred content configuration
|
||||
|
||||
For example, consider two reposities A and B. A is in group M and B is in
|
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group N. A has preferred content `not inallgroup=N` and B has `not inallgroup=M`.
|
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|
||||
If A contains a file, then B will want to also get a copy. And things
|
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stabilize there. But if the file is removed from A, then B also wants to
|
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remove it. And once B has removed it, A wants a copy of it. And then B also
|
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wants a copy of it. So the result is that the file got transferred twice,
|
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to end up right back where we started.
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|
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The worst case of this is `not present`, where the file gets dropped and
|
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transferred over and over again. The docs warn against using that one. But
|
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they can't warn about every bad preferred content expression.
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|
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Mostly, git-annex manages to keep things stable that seem like they would
|
||||
not be. Consider repo A that is not in group foo, and B is in group foo. A
|
||||
has preferred content "onlyingroup=foo". This will make A want a file that
|
||||
is in B. And once it has it, it will not want to drop it. That's because
|
||||
when dropping, it considers if it would be preferred content after the
|
||||
drop. In this case it would, so it doesn't drop it.
|
||||
|
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## balanced preferred content
|
||||
|
||||
When [[design/balanced_preferred_content]] is added, a whole new level of
|
||||
|
|
@ -35,7 +33,7 @@ matter the sizes of the underlying repositories, but balanced preferred
|
|||
content does take repository fullness into account, which further
|
||||
complicates fully understanding the behavior.
|
||||
|
||||
Notice that `fullbalanced()` is not stable when used
|
||||
Notice that `fullybalanced()` is not stable when used
|
||||
on its own, and so `balanced()` adds an "or present" to stabilize it.
|
||||
And so `not balanced()` includes `not present`, which is bad!
|
||||
|
||||
|
|
@ -53,16 +51,31 @@ would be good if git-annex warned and/or refused to set such an expression
|
|||
if it could detect it. Similarly `not groupwanted` could be detected as a
|
||||
problem when the group's preferred content expression contains `present`.
|
||||
|
||||
Is there is a more general purpose and not expensive way to detect such
|
||||
problematic expressions, that can find problems such as the
|
||||
`not inallgroup=N` example above?
|
||||
> This is now detected and such an unstable expression never matches.
|
||||
> --debug explains why too.
|
||||
>
|
||||
> Note that the detection will not be trigged by `"not (not present)"`,
|
||||
> but it will by `"include=* or (not present)"` even though that is always
|
||||
> stable, because `"include=*"` always matches and so what it's ORed with
|
||||
> doesn't matter. Probably noone will set something like that in real life
|
||||
> though.
|
||||
>
|
||||
> It's problimatic to make `git-annex wanted` warn about it. Consider
|
||||
> if in one repository, groupwanted is set to "present". In another
|
||||
> repository, which is disconnected, wanted is set to "not groupwanted".
|
||||
> Both operations are ok, but upon merging the two repositories,
|
||||
> the combined effect is that "not present" has been set.
|
||||
>
|
||||
> So while it could warn sometimes on setting "not present",
|
||||
> it would sometimes not be able to. Better to not warn inconsistently.
|
||||
> --[[Joey]]
|
||||
|
||||
## simulation
|
||||
|
||||
Simulation seems fairly straightforward, just simulate the network of
|
||||
git-annex repositories with random files with different sizes and
|
||||
metadata. Be sure to enforce invariants like numcopies the same as
|
||||
git-annex does.
|
||||
metadata. Or use the current files and metadata.
|
||||
Be sure to enforce invariants like numcopies the same as git-annex does.
|
||||
|
||||
Since users can write preferred content expressions, this should be
|
||||
targeted at being used by end users.
|
||||
|
|
|
|||
Loading…
Add table
Add a link
Reference in a new issue