annex.maxextensions configuration

Controls how many filename extensions to preserve.

Sponsored-by: the NIH-funded NICEMAN (ReproNim TR&D3) project

Annex/View.hs

@@ -387,7 +387,7 @@ prop_view_roundtrips (AssociatedFile Nothing) _ _ = True
 prop_view_roundtrips (AssociatedFile (Just f)) metadata visible = or
 	[ B.null (P.takeFileName f) && B.null (P.takeDirectory f)
 	, viewTooLarge view
-	, all hasfields (viewedFiles view (viewedFileFromReference' Nothing) (fromRawFilePath f) metadata)
+	, all hasfields (viewedFiles view (viewedFileFromReference' Nothing Nothing) (fromRawFilePath f) metadata)
 	]
   where
 	view = View (Git.Ref "foo") $

Annex/View/ViewedFile.hs

@@ -1,6 +1,6 @@
 {- filenames (not paths) used in views
  -
- - Copyright 2014-2023 Joey Hess <id@joeyh.name>
+ - Copyright 2014-2024 Joey Hess <id@joeyh.name>
  -
  - Licensed under the GNU AGPL version 3 or higher.
  -}
@@ -19,6 +19,7 @@ module Annex.View.ViewedFile (
 
 import Annex.Common
 import Utility.QuickCheck
+import Backend.Utilities (maxExtensions)
 
 import qualified Data.ByteString as S
 
@@ -37,10 +38,12 @@ type MkViewedFile = FilePath -> ViewedFile
  - So, from dir/subdir/file.foo, generate file_%dir%subdir%.foo
  -}
 viewedFileFromReference :: GitConfig -> MkViewedFile
-viewedFileFromReference g = viewedFileFromReference' (annexMaxExtensionLength g)
+viewedFileFromReference g = viewedFileFromReference'
+	(annexMaxExtensionLength g)
+	(annexMaxExtensions g)
 
-viewedFileFromReference' :: Maybe Int -> MkViewedFile
-viewedFileFromReference' maxextlen f = concat $
+viewedFileFromReference' :: Maybe Int -> Maybe Int -> MkViewedFile
+viewedFileFromReference' maxextlen maxextensions f = concat $
 	[ escape (fromRawFilePath base')
 	, if null dirs then "" else "_%" ++ intercalate "%" (map escape dirs) ++ "%"
 	, escape $ fromRawFilePath $ S.concat extensions'
@@ -51,11 +54,12 @@ viewedFileFromReference' maxextlen f = concat $
 	(base, extensions) = case maxextlen of
 		Nothing -> splitShortExtensions (toRawFilePath basefile')
 		Just n -> splitShortExtensions' (n+1) (toRawFilePath basefile')
-	{- Limit to two extensions maximum. -}
+	{- Limit number of extensions. -}
+	maxextensions' = fromMaybe maxExtensions maxextensions
 	(base', extensions')
-		| length extensions <= 2 = (base, extensions)
+		| length extensions <= maxextensions' = (base, extensions)
 		| otherwise = 
-			let (es,more) = splitAt 2 (reverse extensions)
+			let (es,more) = splitAt maxextensions' (reverse extensions)
 			in (base <> mconcat (reverse more), reverse es)
 	{- On Windows, if the filename looked like "dir/c:foo" then
 	 - basefile would look like it contains a drive letter, which will
@@ -101,7 +105,8 @@ prop_viewedFile_roundtrips tf
 	-- Relative filenames wanted, not directories.
 	| any (isPathSeparator) (end f ++ beginning f) = True
 	| isAbsolute f || isDrive f = True
-	| otherwise = dir == dirFromViewedFile (viewedFileFromReference' Nothing f)
+	| otherwise = dir == dirFromViewedFile 
+		(viewedFileFromReference' Nothing Nothing f)
   where
 	f = fromTestableFilePath tf
 	dir = joinPath $ beginning $ splitDirectories f

Backend/Hash.hs

@@ -170,11 +170,14 @@ needsUpgrade key = or
 	]
 
 trivialMigrate :: Key -> Backend -> AssociatedFile -> Bool -> Annex (Maybe Key)
-trivialMigrate oldkey newbackend afile _inannex = trivialMigrate' oldkey newbackend afile
-	<$> (annexMaxExtensionLength <$> Annex.getGitConfig)
+trivialMigrate oldkey newbackend afile _inannex = do
+	c <- Annex.getGitConfig
+	return $ trivialMigrate' oldkey newbackend afile
+		(annexMaxExtensionLength c)
+		(annexMaxExtensions c)
 
-trivialMigrate' :: Key -> Backend -> AssociatedFile -> Maybe Int -> Maybe Key
-trivialMigrate' oldkey newbackend afile maxextlen
+trivialMigrate' :: Key -> Backend -> AssociatedFile -> Maybe Int -> Maybe Int -> Maybe Key
+trivialMigrate' oldkey newbackend afile maxextlen maxexts
 	{- Fast migration from hashE to hash backend. -}
 	| migratable && hasExt oldvariety = Just $ alterKey oldkey $ \d -> d
 		{ keyName = S.toShort (keyHash oldkey)
@@ -185,7 +188,7 @@ trivialMigrate' oldkey newbackend afile maxextlen
 		AssociatedFile Nothing -> Nothing
 		AssociatedFile (Just file) -> Just $ alterKey oldkey $ \d -> d
 			{ keyName = S.toShort $ keyHash oldkey 
-				<> selectExtension maxextlen file
+				<> selectExtension maxextlen maxexts file
 			, keyVariety = newvariety
 			}
 	{- Upgrade to fix bad previous migration that created a

Backend/Utilities.hs

@@ -45,20 +45,24 @@ genKeyName s
  - file that the key was generated from.  -}
 addE :: KeySource -> (KeyVariety -> KeyVariety) -> Key -> Annex Key
 addE source sethasext k = do
-	maxlen <- annexMaxExtensionLength <$> Annex.getGitConfig
-	let ext = selectExtension maxlen (keyFilename source)
+	c <- Annex.getGitConfig
+	let ext = selectExtension
+		(annexMaxExtensionLength c)
+		(annexMaxExtensions c)
+		(keyFilename source)
 	return $ alterKey k $ \d -> d
 		{ keyName = keyName d <> S.toShort ext
 		, keyVariety = sethasext (keyVariety d)
 		}
 
-selectExtension :: Maybe Int -> RawFilePath -> S.ByteString
-selectExtension maxlen f
+selectExtension :: Maybe Int -> Maybe Int -> RawFilePath -> S.ByteString
+selectExtension maxlen maxextensions f
 	| null es = ""
 	| otherwise = S.intercalate "." ("":es)
   where
 	es = filter (not . S.null) $ reverse $
-		take 2 $ filter (S.all validInExtension) $
+		take (fromMaybe maxExtensions maxextensions) $
+		filter (S.all validInExtension) $
 		takeWhile shortenough $
 		reverse $ S.split (fromIntegral (ord '.')) (P.takeExtensions f')
 	shortenough e = S.length e <= fromMaybe maxExtensionLen maxlen
@@ -75,3 +79,6 @@ validInExtension c
 
 maxExtensionLen :: Int
 maxExtensionLen = 4 -- long enough for "jpeg"
+
+maxExtensions :: Int
+maxExtensions = 2 -- include both extensions of "tar.gz"

CHANGELOG

@@ -18,6 +18,8 @@ git-annex (10.20240228) UNRELEASED; urgency=medium
   * Added rclone special remote, which can be used without needing
     to install the git-annex-remote-rclone program. This needs
     a new version of rclone, which supports "rclone gitannex".
+  * annex.maxextensions configuration controls how many filename
+    extensions to preserve.
 
  -- Joey Hess <id@joeyh.name>  Tue, 27 Feb 2024 13:07:10 -0400
 

Types/GitConfig.hs

@@ -136,6 +136,7 @@ data GitConfig = GitConfig
 	, annexAllowedIPAddresses :: String
 	, annexAllowUnverifiedDownloads :: Bool
 	, annexMaxExtensionLength :: Maybe Int
+	, annexMaxExtensions :: Maybe Int
 	, annexJobs :: Concurrency
 	, annexCacheCreds :: Bool
 	, annexAutoUpgradeRepository :: Bool
@@ -244,6 +245,7 @@ extractGitConfig configsource r = GitConfig
 	, annexAllowUnverifiedDownloads = (== Just "ACKTHPPT") $
 		getmaybe (annexConfig "security.allow-unverified-downloads")
 	, annexMaxExtensionLength = getmayberead (annexConfig "maxextensionlength")
+	, annexMaxExtensions = getmayberead (annexConfig "maxextensions")
 	, annexJobs = fromMaybe NonConcurrent $ 
 		parseConcurrency =<< getmaybe (annexConfig "jobs")
 	, annexCacheCreds = getbool (annexConfig "cachecreds") True

doc/git-annex.mdwn

@@ -873,8 +873,16 @@ repository, using [[git-annex-config]]. See its man page for a list.)
   and also when generating a view branch.
 
   The default length is 4, which allows extensions like "jpeg". The dot before
-  the extension is not counted part of its length. At most two extensions
-  at the end of a filename will be preserved, e.g. .gz or .tar.gz .
+  the extension is not counted part of its length.
+
+* `annex.maxextensions`
+
+  Maximum number of filename extensions to preserve when using a backend
+  that preserves filename extensions, and also when generating a view
+  branch.
+
+  The default is 2, which allows for compound extensions like ".tar.gz".
+  When set to 1, it will only preserve the last extension, eg ".gz".
 
 * `annex.diskreserve`
 

doc/todo/way_to_instruct_on_how_to_decide_on_extension__63__.mdwn

@@ -12,3 +12,5 @@ Just throwing against the wall to see if sticks
 
 [[!meta author=yoh]]
 [[!tag projects/repronim]]
+
+> added annex.maxextensions config, [[done]] --[[Joey]]

doc/todo/way_to_instruct_on_how_to_decide_on_extension__63__/comment_1_b3e9fcb09b6455301a5f7a9bf50a8a49._comment

@@ -9,7 +9,7 @@ extension. For a .mkv file, I'd guess most video players don't care about
 the extension.
 
 annex.maxextensionlength won't help here, but I think it makes sense to add
-an analagous annex.maxextensioncount which would default to 2 (as it
+an analagous annex.maxextensions which would default to 2 (as it
 currently does to handle .tar.gz) but you could set to 1.
 
 It might also be a reasonable argument that filename extensions are not