avoid sometimes expensive operations when annex.supportunlocked = false

This will mostly just avoid a DB lookup, so things get marginally
faster. But in cases where there are many files using the same key, it
can be a more significant speedup.

Added overhead is one MVar lookup per call, which should be small
enough, since this happens after transferring or ingesting a file,
which is always a lot more work than that. It would be nice, though,
to move getGitConfig to AnnexRead, which there is an open todo about.

Annex/Content.hs

@@ -340,12 +340,13 @@ moveAnnex key af src = ifM (checkSecureHashes' key)
 			liftIO $ moveFile
 				(fromRawFilePath src)
 				(fromRawFilePath dest)
-			g <- Annex.gitRepo 
-			fs <- map (`fromTopFilePath` g)
-				<$> Database.Keys.getAssociatedFiles key
-			unless (null fs) $ do
-				ics <- mapM (populatePointerFile (Restage True) key dest) fs
-				Database.Keys.storeInodeCaches' key [dest] (catMaybes ics)
+			whenM (annexSupportUnlocked <$> Annex.getGitConfig) $ do
+				g <- Annex.gitRepo 
+				fs <- map (`fromTopFilePath` g)
+					<$> Database.Keys.getAssociatedFiles key
+				unless (null fs) $ do
+					ics <- mapM (populatePointerFile (Restage True) key dest) fs
+					Database.Keys.storeInodeCaches' key [dest] (catMaybes ics)
 		)
 	alreadyhave = liftIO $ R.removeLink src
 
@@ -502,10 +503,11 @@ removeAnnex (ContentRemovalLock key) = withObjectLoc key $ \file ->
 	cleanObjectLoc key $ do
 		secureErase file
 		liftIO $ removeWhenExistsWith R.removeLink file
-		g <- Annex.gitRepo 
-		mapM_ (\f -> void $ tryIO $ resetpointer $ fromTopFilePath f g)
-			=<< Database.Keys.getAssociatedFiles key
-		Database.Keys.removeInodeCaches key
+		whenM (annexSupportUnlocked <$> Annex.getGitConfig) $ do
+			g <- Annex.gitRepo 
+			mapM_ (\f -> void $ tryIO $ resetpointer $ fromTopFilePath f g)
+				=<< Database.Keys.getAssociatedFiles key
+			Database.Keys.removeInodeCaches key
   where
 	-- Check associated pointer file for modifications, and reset if
 	-- it's unmodified.

Annex/Ingest.hs

@@ -225,14 +225,15 @@ finishIngestUnlocked' key source restage = do
 
 {- Copy to any unlocked files using the same key. -}
 populateUnlockedFiles :: Key -> KeySource -> Restage -> Annex ()
-populateUnlockedFiles key source restage = do
-	obj <- calcRepo (gitAnnexLocation key)
-	g <- Annex.gitRepo
-	ingestedf <- flip fromTopFilePath g
-		<$> inRepo (toTopFilePath (keyFilename source))
-	afs <- map (`fromTopFilePath` g) <$> Database.Keys.getAssociatedFiles key
-	forM_ (filter (/= ingestedf) afs) $
-		populatePointerFile restage key obj
+populateUnlockedFiles key source restage = 
+	whenM (annexSupportUnlocked <$> Annex.getGitConfig) $ do
+		obj <- calcRepo (gitAnnexLocation key)
+		g <- Annex.gitRepo
+		ingestedf <- flip fromTopFilePath g
+			<$> inRepo (toTopFilePath (keyFilename source))
+		afs <- map (`fromTopFilePath` g) <$> Database.Keys.getAssociatedFiles key
+		forM_ (filter (/= ingestedf) afs) $
+			populatePointerFile restage key obj
 
 cleanCruft :: KeySource -> Annex ()
 cleanCruft source = when (contentLocation source /= keyFilename source) $

doc/bugs/significant_performance_regression_impacting_datal/comment_28_0d6a37f823cd9cb3ed1e6e90066ebd2c._comment

@@ -0,0 +1,9 @@
+[[!comment format=mdwn
+ username="joey"
+ subject="""comment 28"""
+ date="2021-06-14T16:31:26Z"
+ content="""
+@Ilya sure can be skipped when annex.supportunlocked=false.
+I've implemented that. (And also for several other cases that have similar
+behavior, like dropping a key.)
+"""]]

doc/todo/move_readonly_values_to_AnnexRead.mdwn

@@ -5,8 +5,8 @@ moved to AnnexRead for a performance win and also to make clean how it's
 used. --[[Joey]]
 
 The easy things have been moved now, but some things like Annex.force and
-Annex.fast would be good to move. Moving those would involve running
-argument processing outside the Annex monad. The main reason argument
-processing runs in the Annex monad is to set those values, but there may be
-other reasons too, so this will be a large set of changes that need to all
-happen together. --[[Joey]]
+Annex.fast and Annex.getGitConfig would be good to move. Moving those would
+involve running argument processing outside the Annex monad. The main
+reason argument processing runs in the Annex monad is to set those values,
+but there may be other reasons too, so this will be a large set of changes
+that need to all happen together. --[[Joey]]