add annex-ignore-command and annex-sync-command configs

Added remote configuration settings annex-ignore-command and
annex-sync-command, which are dynamic equivilants of the annex-ignore
and annex-sync configurations.

For this I needed a new DynamicConfig infrastructure. Its implementation
should be as fast as before when there is no dynamic config, and it caches
so shell commands are only run once.

Note that annex-ignore-command exits nonzero when the remote should be ignored.
While that may seem backwards, it allows using the same command for it as
for annex-sync-command when you want to disable both.

This commit was sponsored by Trenton Cronholm on Patreon.

Command/EnableRemote.hs

@@ -20,6 +20,8 @@ import qualified Remote.Git
 import Logs.UUID
 import Annex.UUID
 import Config
+import Config.DynamicConfig
+import Types.GitConfig
 
 import qualified Data.Map as M
 
@@ -76,7 +78,9 @@ startSpecialRemote name config (Just (u, c)) = do
 	let fullconfig = config `M.union` c	
 	t <- either giveup return (Annex.SpecialRemote.findType fullconfig)
 	showStart "enableremote" name
-	gc <- maybe def Remote.gitconfig <$> Remote.byUUID u
+	gc <- maybe (liftIO dummyRemoteGitConfig) 
+		(return . Remote.gitconfig)
+		=<< Remote.byUUID u
 	next $ performSpecialRemote t u fullconfig gc
 
 performSpecialRemote :: RemoteType -> UUID -> R.RemoteConfig -> RemoteGitConfig -> CommandPerform
@@ -109,5 +113,6 @@ unknownNameError prefix = do
   where
 	isdisabled r = anyM id
 		[ (==) NoUUID <$> getRepoUUID r
-		, remoteAnnexIgnore <$> Annex.getRemoteGitConfig r
+		, liftIO . getDynamicConfig . remoteAnnexIgnore
+			=<< Annex.getRemoteGitConfig r
 		]

Command/InitRemote.hs

@@ -15,6 +15,7 @@ import qualified Remote
 import qualified Logs.Remote
 import qualified Types.Remote as R
 import Logs.UUID
+import Types.GitConfig
 
 cmd :: Command
 cmd = command "initremote" SectionSetup
@@ -46,7 +47,8 @@ start (name:ws) = ifM (isJust <$> findExisting name)
 
 perform :: RemoteType -> String -> R.RemoteConfig -> CommandPerform
 perform t name c = do
-	(c', u) <- R.setup t R.Init cu Nothing c def
+	dummycfg <- liftIO dummyRemoteGitConfig
+	(c', u) <- R.setup t R.Init cu Nothing c dummycfg
 	next $ cleanup u name c'
   where
 	cu = case M.lookup "uuid" c of

Command/Sync.hs

@@ -40,6 +40,7 @@ import qualified Git
 import qualified Remote.Git
 import Config
 import Config.GitConfig
+import Config.DynamicConfig
 import Config.Files
 import Annex.Wanted
 import Annex.Content
@@ -152,8 +153,8 @@ seek o = allowConcurrentOutput $ do
 
 	remotes <- syncRemotes (syncWith o)
 	let gitremotes = filter Remote.gitSyncableRemote remotes
-	let dataremotes = filter (\r -> Remote.uuid r /= NoUUID) $ 
-		filter (not . remoteAnnexIgnore . Remote.gitconfig) remotes
+	dataremotes <- filter (\r -> Remote.uuid r /= NoUUID)
+		<$> filterM (not <$$> liftIO . getDynamicConfig . remoteAnnexIgnore . Remote.gitconfig) remotes
 
 	-- Syncing involves many actions, any of which can independently
 	-- fail, without preventing the others from running.
@@ -247,10 +248,15 @@ remoteBranch remote = Git.Ref.underBase $ "refs/remotes/" ++ Remote.name remote
 -- Do automatic initialization of remotes when possible when getting remote
 -- list.
 syncRemotes :: [String] -> Annex [Remote]
-syncRemotes ps = syncRemotes' ps =<< Remote.remoteList' True
+syncRemotes ps = do
+	remotelist <- Remote.remoteList' True
+	available <- filterM (liftIO . getDynamicConfig . remoteAnnexSync . Remote.gitconfig)
+		(filter (not . Remote.isXMPPRemote) remotelist)
+	syncRemotes' ps available
 
 syncRemotes' :: [String] -> [Remote] -> Annex [Remote]
-syncRemotes' ps remotelist = ifM (Annex.getState Annex.fast) ( nub <$> pickfast , wanted )
+syncRemotes' ps available = 
+	ifM (Annex.getState Annex.fast) ( nub <$> pickfast , wanted )
   where
 	pickfast = (++) <$> listed <*> (filterM good (fastest available))
 	
@@ -260,9 +266,6 @@ syncRemotes' ps remotelist = ifM (Annex.getState Annex.fast) ( nub <$> pickfast
 	
 	listed = concat <$> mapM Remote.byNameOrGroup ps
 	
-	available = filter (remoteAnnexSync . Remote.gitconfig)
-		$ filter (not . Remote.isXMPPRemote) remotelist
-	
 	good r
 		| Remote.gitSyncableRemote r = Remote.Git.repoAvail $ Remote.repo r
 		| otherwise = return True