New annex.largefiles setting, which configures which files git annex add and the assistant add to the annex.

I would have sort of liked to put this in .gitattributes, but it seems
it does not support multi-word attribute values. Also, making this a single
config setting makes it easy to only parse the expression once.

A natural next step would be to make the assistant `git add` files that
are not annex.largefiles. OTOH, I don't think `git annex add` should
`git add` such files, because git-annex command line tools are
not in the business of wrapping git command line tools.

Annex/FileMatcher.hs

@@ -0,0 +1,86 @@
+{- git-annex file matching
+ -
+ - Copyright 2012, 2013 Joey Hess <joey@kitenet.net>
+ -
+ - Licensed under the GNU GPL version 3 or higher.
+ -}
+
+module Annex.FileMatcher where
+
+import qualified Data.Map as M
+
+import Common.Annex
+import Limit
+import Utility.Matcher
+import Types.Group
+import Logs.Group
+import Annex.UUID
+import qualified Annex
+import Git.FilePath
+
+import Data.Either
+import qualified Data.Set as S
+
+type FileMatcher = Matcher MatchFiles
+
+checkFileMatcher :: FileMatcher -> FilePath -> Annex Bool
+checkFileMatcher matcher file = checkFileMatcher' matcher file S.empty True
+
+checkFileMatcher' :: FileMatcher -> FilePath -> AssumeNotPresent -> Bool -> Annex Bool
+checkFileMatcher' matcher file notpresent def
+	| isEmpty matcher = return def
+	| otherwise = do
+		matchfile <- getTopFilePath <$> inRepo (toTopFilePath file)
+		let fi = Annex.FileInfo
+			{ Annex.matchFile = matchfile
+			, Annex.relFile = file
+			}
+		matchMrun matcher $ \a -> a notpresent fi
+
+matchAll :: FileMatcher
+matchAll = generate []
+
+parsedToMatcher :: [Either String (Token MatchFiles)] -> Either String FileMatcher
+parsedToMatcher parsed = case partitionEithers parsed of
+	([], vs) -> Right $ generate vs
+	(es, _) -> Left $ unwords $ map ("Parse failure: " ++) es
+
+parseToken :: MkLimit -> GroupMap -> String -> Either String (Token MatchFiles)
+parseToken checkpresent groupmap t
+	| any (== t) Utility.Matcher.tokens = Right $ Utility.Matcher.token t
+	| t == "present" = use checkpresent
+	| otherwise = maybe (Left $ "near " ++ show t) use $ M.lookup k $
+		M.fromList
+			[ ("include", limitInclude)
+			, ("exclude", limitExclude)
+			, ("copies", limitCopies)
+			, ("inbackend", limitInBackend)
+			, ("largerthan", limitSize (>))
+			, ("smallerthan", limitSize (<))
+			, ("inallgroup", limitInAllGroup groupmap)
+			]
+  where
+	(k, v) = separate (== '=') t
+	use a = Utility.Matcher.Operation <$> a v
+
+{- This is really dumb tokenization; there's no support for quoted values.
+ - Open and close parens are always treated as standalone tokens;
+ - otherwise tokens must be separated by whitespace. -}
+tokenizeMatcher :: String -> [String]
+tokenizeMatcher = filter (not . null ) . concatMap splitparens . words
+  where
+	splitparens = segmentDelim (`elem` "()")
+
+{- Generates a matcher for files large enough (or meeting other criteria)
+ - to be added to the annex, rather than directly to git. -}
+largeFilesMatcher :: Annex FileMatcher
+largeFilesMatcher = go =<< annexLargeFiles <$> Annex.getGitConfig
+  where
+  	go Nothing = return $ matchAll
+	go (Just expr) = do
+		m <- groupMap
+		u <- getUUID
+		either badexpr return $ parsedToMatcher $
+			map (parseToken (limitPresent $ Just u) m)
+				(tokenizeMatcher expr)
+	badexpr e = error $ "bad annex.largefiles configuration: " ++ e

Assistant/Threads/Watcher.hs

@@ -35,6 +35,7 @@ import Annex.Direct
 import Annex.Content.Direct
 import Annex.CatFile
 import Annex.Link
+import Annex.FileMatcher
 import Git.Types
 import Config
 import Utility.ThreadScheduler
@@ -77,8 +78,9 @@ watchThread = namedThread "Watcher" $
 runWatcher :: Assistant ()
 runWatcher = do
 	startup <- asIO1 startupScan
+	matcher <- liftAnnex $ largeFilesMatcher
 	direct <- liftAnnex isDirect
-	addhook <- hook $ if direct then onAddDirect else onAdd
+	addhook <- hook $ if direct then onAddDirect matcher else onAdd matcher
 	delhook <- hook onDel
 	addsymlinkhook <- hook $ onAddSymlink direct
 	deldirhook <- hook onDelDir
@@ -166,16 +168,22 @@ runHandler handler file filestatus = void $ do
 			liftAnnex $ Annex.Queue.flushWhenFull
 			recordChange change
 
-onAdd :: Handler
-onAdd file filestatus
-	| maybe False isRegularFile filestatus = pendingAddChange file
+checkAdd :: FileMatcher -> FilePath -> Assistant (Maybe Change)
+checkAdd matcher file = ifM (liftAnnex $ checkFileMatcher matcher file)
+	( pendingAddChange file
+	, noChange
+	)
+
+onAdd :: FileMatcher -> Handler
+onAdd matcher file filestatus
+	| maybe False isRegularFile filestatus = checkAdd matcher file
 	| otherwise = noChange
 
 {- In direct mode, add events are received for both new files, and
  - modified existing files. Or, in some cases, existing files that have not
  - really been modified. -}
-onAddDirect :: Handler
-onAddDirect file fs = do
+onAddDirect :: FileMatcher -> Handler
+onAddDirect matcher file fs = do
 	debug ["add direct", file]
 	v <- liftAnnex $ catKeyFile file
 	case (v, fs) of
@@ -184,9 +192,9 @@ onAddDirect file fs = do
 				( noChange
 				, do
 					liftAnnex $ changedDirect key file
-					pendingAddChange file
+					checkAdd matcher file
 				)
-		_ -> pendingAddChange file
+		_ -> checkAdd matcher file
 
 {- A symlink might be an arbitrary symlink, which is just added.
  - Or, if it is a git-annex symlink, ensure it points to the content

Command/Add.hs

@@ -1,6 +1,6 @@
 {- git-annex command
  -
- - Copyright 2010 Joey Hess <joey@kitenet.net>
+ - Copyright 2010, 2013 Joey Hess <joey@kitenet.net>
  -
  - Licensed under the GNU GPL version 3 or higher.
  -}
@@ -27,6 +27,7 @@ import Utility.Touch
 import Utility.FileMode
 import Config
 import Utility.InodeCache
+import Annex.FileMatcher
 
 def :: [Command]
 def = [notBareRepo $ command "add" paramPaths seek SectionCommon
@@ -37,10 +38,16 @@ def = [notBareRepo $ command "add" paramPaths seek SectionCommon
  - In direct mode, it acts on any files that have changed. -}
 seek :: [CommandSeek]
 seek =
-	[ withFilesNotInGit start
-	, whenNotDirect $ withFilesUnlocked start
-	, whenDirect $ withFilesMaybeModified start
+	[ go withFilesNotInGit
+	, whenNotDirect $ go withFilesUnlocked
+	, whenDirect $ go withFilesMaybeModified
 	]
+  where
+  	go a = withValue largeFilesMatcher $ \matcher ->
+		a $ \file -> ifM (checkFileMatcher matcher file)
+			( start file
+			, stop
+			)
 
 {- The add subcommand annexes a file, generating a key for it using a
  - backend, and then moving it into the annex directory and setting up

Limit.hs

@@ -204,10 +204,15 @@ addSmallerThan = addLimit . limitSize (<)
 limitSize :: (Maybe Integer -> Maybe Integer -> Bool) -> MkLimit
 limitSize vs s = case readSize dataUnits s of
 	Nothing -> Left "bad size"
-	Just sz -> Right $ const $ lookupFile >=> check sz
+	Just sz -> Right $ go sz
   where
-	check _ Nothing = return False
-	check sz (Just (key, _)) = return $ keySize key `vs` Just sz
+  	go sz _ fi = lookupFile fi >>= check fi sz
+	check _ sz (Just (key, _)) = return $ keySize key `vs` Just sz
+	check fi sz Nothing = do
+		filesize <- liftIO $ catchMaybeIO $
+			fromIntegral . fileSize
+				<$> getFileStatus (Annex.relFile fi)
+		return $ filesize `vs` Just sz
 
 addTimeLimit :: String -> Annex ()
 addTimeLimit s = do

Logs/PreferredContent.hs

@@ -27,8 +27,8 @@ import qualified Annex
 import Logs.UUIDBased
 import Limit
 import qualified Utility.Matcher
+import Annex.FileMatcher
 import Annex.UUID
-import Git.FilePath
 import Types.Group
 import Logs.Group
 import Types.StandardGroups
@@ -50,19 +50,11 @@ preferredContentSet NoUUID _ = error "unknown UUID; cannot modify"
  - (or the current repository if none is specified). -}
 isPreferredContent :: Maybe UUID -> AssumeNotPresent -> FilePath -> Bool -> Annex Bool
 isPreferredContent mu notpresent file def = do
-	matchfile <- getTopFilePath <$> inRepo (toTopFilePath file)
-	let fi = Annex.FileInfo
-		{ Annex.matchFile = matchfile
-		, Annex.relFile = file
-		}
 	u <- maybe getUUID return mu
 	m <- preferredContentMap
 	case M.lookup u m of
 		Nothing -> return def
-		Just matcher
-			| Utility.Matcher.isEmpty matcher -> return def
-			| otherwise -> Utility.Matcher.matchMrun matcher $ 
-				\a -> a notpresent fi
+		Just matcher -> checkFileMatcher' matcher file notpresent def
 
 {- The map is cached for speed. -}
 preferredContentMap :: Annex Annex.PreferredContentMap
@@ -87,56 +79,30 @@ preferredContentMapRaw = simpleMap . parseLog Just
  - because the configuration is shared amoung repositories and newer
  - versions of git-annex may add new features. Instead, parse errors
  - result in a Matcher that will always succeed. -}
-makeMatcher :: GroupMap -> UUID -> String -> Utility.Matcher.Matcher MatchFiles
+makeMatcher :: GroupMap -> UUID -> String -> FileMatcher
 makeMatcher groupmap u s
 	| s == "standard" = standardMatcher groupmap u
 	| null (lefts tokens) = Utility.Matcher.generate $ rights tokens
 	| otherwise = matchAll
   where
-	tokens = map (parseToken (Just u) groupmap) (tokenizeMatcher s)
+	tokens = map (parseToken (limitPresent $ Just u) groupmap) (tokenizeMatcher s)
 
 {- Standard matchers are pre-defined for some groups. If none is defined,
  - or a repository is in multiple groups with standard matchers, match all. -}
-standardMatcher :: GroupMap -> UUID -> Utility.Matcher.Matcher MatchFiles
+standardMatcher :: GroupMap -> UUID -> FileMatcher
 standardMatcher m u = maybe matchAll (makeMatcher m u . preferredContent) $
 	getStandardGroup =<< u `M.lookup` groupsByUUID m
 
-matchAll :: Utility.Matcher.Matcher MatchFiles
-matchAll = Utility.Matcher.generate []
-
 {- Checks if an expression can be parsed, if not returns Just error -}
 checkPreferredContentExpression :: String -> Maybe String
 checkPreferredContentExpression s
 	| s == "standard" = Nothing
-	| otherwise = case lefts $ map (parseToken Nothing emptyGroupMap) (tokenizeMatcher s) of
-		[] -> Nothing
-		l -> Just $ unwords $ map ("Parse failure: " ++) l
-
-parseToken :: (Maybe UUID) -> GroupMap -> String -> Either String (Utility.Matcher.Token MatchFiles)
-parseToken mu groupmap t
-	| any (== t) Utility.Matcher.tokens = Right $ Utility.Matcher.token t
-	| t == "present" = use $ limitPresent mu
-	| otherwise = maybe (Left $ "near " ++ show t) use $ M.lookup k $
-		M.fromList
-			[ ("include", limitInclude)
-			, ("exclude", limitExclude)
-			, ("copies", limitCopies)
-			, ("inbackend", limitInBackend)
-			, ("largerthan", limitSize (>))
-			, ("smallerthan", limitSize (<))
-			, ("inallgroup", limitInAllGroup groupmap)
-			]
+	| otherwise = case parsedToMatcher vs of
+		Left e -> Just e
+		Right _ -> Nothing
   where
-	(k, v) = separate (== '=') t
-	use a = Utility.Matcher.Operation <$> a v
-
-{- This is really dumb tokenization; there's no support for quoted values.
- - Open and close parens are always treated as standalone tokens;
- - otherwise tokens must be separated by whitespace. -}
-tokenizeMatcher :: String -> [String]
-tokenizeMatcher = filter (not . null ) . concatMap splitparens . words
-  where
-	splitparens = segmentDelim (`elem` "()")
+	vs = map (parseToken (limitPresent Nothing) emptyGroupMap)
+		(tokenizeMatcher s)
 
 {- Puts a UUID in a standard group, and sets its preferred content to use
  - the standard expression for that group, unless something is already set. -}

Types/GitConfig.hs

@@ -37,6 +37,7 @@ data GitConfig = GitConfig
 	, annexAutoCommit :: Bool
 	, annexWebOptions :: [String]
 	, annexCrippledFileSystem :: Bool
+	, annexLargeFiles :: Maybe String
 	, coreSymlinks :: Bool
 	}
 
@@ -59,6 +60,7 @@ extractGitConfig r = GitConfig
 	, annexAutoCommit = getbool (annex "autocommit") True
 	, annexWebOptions = getwords (annex "web-options")
 	, annexCrippledFileSystem = getbool (annex "crippledfilesystem") False
+	, annexLargeFiles = getmaybe (annex "largefiles")
 	, coreSymlinks = getbool "core.symlinks" True
 	}
   where

debian/changelog

@@ -10,6 +10,8 @@ git-annex (4.20130324) UNRELEASED; urgency=low
   * webapp: Run ssh server probes in a way that will work when the
     login shell is a monstrosity that should have died 25 years ago,
     such as csh.
+  * New annex.largefiles setting, which configures which files
+    `git annex add` and the assistant add to the annex.
 
  -- Joey Hess <joeyh@debian.org>  Mon, 25 Mar 2013 10:21:46 -0400
 

doc/git-annex.mdwn

@@ -735,6 +735,23 @@ file contents are present at either of two repositories.
 
   Closes a group of file matching options.
 
+# PREFERRED CONTENT
+
+Each repository has a preferred content setting, which specifies content
+that the repository wants to have present. These settings can be configured
+using `git annex vicfg`. They are used by the `--auto` option, and
+by the git-annex assistant.
+
+The preferred content settings are similar, but not identical to
+the file matching options specified above, just without the dashes.
+For example:
+
+	exclude=archive/* and (include=*.mp3 or smallerthan=1mb)
+
+The main differences are that `exclude=` and `include=` always
+match relative to the top of the git repository, and that there is
+no equivilant to --in.
+
 # CONFIGURATION
 
 Like other git commands, git-annex is configured via `.git/config`.
@@ -765,6 +782,19 @@ Here are all the supported configuration settings.
 
   The default reserve is 1 megabyte.
 
+* `annex.largefiles`
+
+  Allows configuring which files `git annex add` and the assistant consider
+  to be large enough to need to be added to the annex. By default,
+  all files are added to the annex.
+
+  The value is a preferred content expression. See PREFERRED CONTENT
+  for details.
+
+  Example:
+
+	annex.largefiles = largerthan=100kb or include=*.mp3
+
 * `annex.queuesize`
 
   git-annex builds a queue of git commands, in order to combine similar
@@ -790,10 +820,6 @@ Here are all the supported configuration settings.
   the accuracy will make `git annex unused` consume more memory;
   run `git annex status` for memory usage numbers.
 
-* `annex.version`
-
-  Automatically maintained, and used to automate upgrades between versions.
-
 * `annex.sshcaching`
 
   By default, git-annex caches ssh connections
@@ -819,6 +845,10 @@ Here are all the supported configuration settings.
   Set to false to prevent the git-annex assistant from automatically
   committing changes to files in the repository.
 
+* `annex.version`
+
+  Automatically maintained, and used to automate upgrades between versions.
+
 * `annex.direct`
 
   Set to true when the repository is in direct mode. Should not be set