don't count clusters as copies

Since the cluster UUID is inserted into the location log when the
location log lists a node as containing content.

Also avoid trying to lock content on cluster remotes. The cluster nodes
are also proxied, so that content can be locked on individual nodes, and
locking content on a cluster as a whole probably won't be implemented.

And made git-annex whereis use numcopies machinery for displaying its
count, so it won't count cluster UUIDs redundantly to nodes.
Other commands, like git-annex info that also display numcopies
information already used the numcopies machinery.

There is more to be done, fromNumCopies is sometimes used to get a
number that is compared with a list of UUIDs. And limitCopies doesn't
use numcopies machinery.

Annex/NumCopies.hs

@@ -1,6 +1,6 @@
 {- git-annex numcopies configuration and checking
  -
- - Copyright 2014-2021 Joey Hess <id@joeyh.name>
+ - Copyright 2014-2024 Joey Hess <id@joeyh.name>
  -
  - Licensed under the GNU AGPL version 3 or higher.
  -}
@@ -20,6 +20,7 @@ module Annex.NumCopies (
 	defaultNumCopies,
 	numCopiesCheck,
 	numCopiesCheck',
+	numCopiesCount,
 	verifyEnoughCopiesToDrop,
 	verifiableCopies,
 	UnVerifiedCopy(..),
@@ -30,6 +31,7 @@ import qualified Annex
 import Types.NumCopies
 import Logs.NumCopies
 import Logs.Trust
+import Types.Cluster
 import Annex.CheckAttr
 import qualified Remote
 import qualified Types.Remote as Remote
@@ -198,12 +200,19 @@ numCopiesCheck file key vs = do
 numCopiesCheck' :: RawFilePath -> (Int -> Int -> v) -> [UUID] -> Annex v
 numCopiesCheck' file vs have = do
 	needed <- fromNumCopies . fst <$> getFileNumMinCopies file
-	let nhave = length have
+	let nhave = numCopiesCount have
 	explain (ActionItemTreeFile file) $ Just $ UnquotedString $
 		"has " ++ show nhave ++ " " ++ pluralCopies nhave ++ 
 		", and the configured annex.numcopies is " ++ show needed
 	return $ nhave `vs` needed
 
+{- When a key is logged as present in a node of the cluster,
+ - the cluster's UUID will also be in the list, but is not a
+ - distinct copy.
+ -}
+numCopiesCount :: [UUID] -> Int
+numCopiesCount = length . filter (not . isClusterUUID)
+
 data UnVerifiedCopy = UnVerifiedRemote Remote | UnVerifiedHere
 	deriving (Ord, Eq)
 
@@ -239,12 +248,17 @@ verifyEnoughCopiesToDrop nolocmsg key removallock neednum needmin skip preverifi
 				Left stillhave -> helper bad missing stillhave (c:cs) lockunsupported
 		| otherwise = case c of
 			UnVerifiedHere -> lockContentShared key contverified
-			UnVerifiedRemote r -> checkremote r contverified $
-				let lockunsupported' = r : lockunsupported
-				in Remote.hasKey r key >>= \case
-					Right True  -> helper bad missing (mkVerifiedCopy RecentlyVerifiedCopy r : have) cs lockunsupported'
-					Left _      -> helper (r:bad) missing have cs lockunsupported'
-					Right False -> helper bad (Remote.uuid r:missing) have cs lockunsupported'
+			UnVerifiedRemote r
+				-- Skip cluster uuids because locking is
+				-- not supported with them, instead will
+				-- lock individual nodes.
+				| isClusterUUID (Remote.uuid r) -> helper bad missing have cs lockunsupported
+				| otherwise -> checkremote r contverified $
+					let lockunsupported' = r : lockunsupported
+					in Remote.hasKey r key >>= \case
+						Right True  -> helper bad missing (mkVerifiedCopy RecentlyVerifiedCopy r : have) cs lockunsupported'
+						Left _      -> helper (r:bad) missing have cs lockunsupported'
+						Right False -> helper bad (Remote.uuid r:missing) have cs lockunsupported'
 		  where
 			contverified vc = helper bad missing (vc : have) cs lockunsupported
 
@@ -312,13 +326,16 @@ pluralCopies _ = "copies"
  - The return lists also exclude any repositories that are untrusted,
  - since those should not be used for verification.
  -
+ - Cluster UUIDs are also excluded since locking on a cluster is done by
+ - locking on individual nodes.
+ -
  - The UnVerifiedCopy list is cost ordered.
  - The VerifiedCopy list contains repositories that are trusted to
  - contain the key.
  -}
 verifiableCopies :: Key -> [UUID] -> Annex ([UnVerifiedCopy], [VerifiedCopy])
 verifiableCopies key exclude = do
-	locs <- Remote.keyLocations key
+	locs <- filter (not . isClusterUUID) <$> Remote.keyLocations key
 	(remotes, trusteduuids) <- Remote.remoteLocations (Remote.IncludeIgnored False) locs
 		=<< trustGet Trusted
 	untrusteduuids <- trustGet UnTrusted

Command/Whereis.hs

@@ -15,6 +15,7 @@ import Logs.Trust
 import Logs.Web
 import Remote.Web (getWebUrls)
 import Annex.UUID
+import Annex.NumCopies
 import qualified Utility.Format
 import qualified Command.Find
 
@@ -86,7 +87,7 @@ perform o remotemap key ai = do
 	(untrustedlocations, safelocations) <- trustPartition UnTrusted locations
 	case formatOption o of
 		Nothing -> do
-			let num = length safelocations
+			let num = numCopiesCount safelocations
 			showNote $ UnquotedString $ show num ++ " " ++ copiesplural num
 			pp <- ppwhereis "whereis" safelocations urls
 			unless (null safelocations) $