enableremote: Can now be used to explicitly enable git-annex to use git remotes. Using the command this way prevents other git-annex commands from probing new git remotes to auto-enable them.

CHANGELOG

@@ -19,6 +19,9 @@ git-annex (6.20160512) UNRELEASED; urgency=medium
     when in a subdirectory of the repository. This affected git annex view.
   * Fix crash when entering/changing view in a subdirectory of a repo that
     has a dotfile in its root.
+  * enableremote: Can now be used to explicitly enable git-annex to use
+    git remotes. Using the command this way prevents other git-annex
+    commands from probing new git remotes to auto-enable them.
   * Support building with ghc 8.0.1.
   * Pass the various gnupg-options configs to gpg in several cases where
     they were not before. Most notably, gnupg-decrypt-options is now

Command/EnableRemote.hs

@@ -1,6 +1,6 @@
 {- git-annex command
  -
- - Copyright 2013 Joey Hess <id@joeyh.name>
+ - Copyright 2013-2016 Joey Hess <id@joeyh.name>
  -
  - Licensed under the GNU GPL version 3 or higher.
  -}
@@ -8,18 +8,22 @@
 module Command.EnableRemote where
 
 import Command
+import qualified Annex
 import qualified Logs.Remote
 import qualified Types.Remote as R
+import qualified Git.Types as Git
 import qualified Annex.SpecialRemote
 import qualified Remote
 import qualified Types.Remote as Remote
+import qualified Remote.Git
 import Logs.UUID
+import Annex.UUID
 
 import qualified Data.Map as M
 
 cmd :: Command
 cmd = command "enableremote" SectionSetup
-	"enables use of an existing special remote"
+	"enables git-annex to use a remote"
 	(paramPair paramName $ paramOptional $ paramRepeating paramKeyValue)
 	(withParams seek)
 
@@ -27,43 +31,62 @@ seek :: CmdParams -> CommandSeek
 seek = withWords start
 
 start :: [String] -> CommandStart
-start [] = unknownNameError "Specify the special remote to enable."
-start (name:ws) = go =<< Annex.SpecialRemote.findExisting name
+start [] = unknownNameError "Specify the remote to enable."
+start (name:rest) = go =<< filter matchingname <$> Annex.fromRepo Git.remotes
   where
-	config = Logs.Remote.keyValToConfig ws
-	
-	go Nothing = do
-		m <- Annex.SpecialRemote.specialRemoteMap
-		confm <- Logs.Remote.readRemoteLog
-		v <- Remote.nameToUUID' name
-		case v of
-			Right u | u `M.member` m ->
-				go (Just (u, fromMaybe M.empty (M.lookup u confm)))
-			_ -> unknownNameError "Unknown special remote."
-	go (Just (u, c)) = do
-		let fullconfig = config `M.union` c	
-		t <- either error return (Annex.SpecialRemote.findType fullconfig)
-		showStart "enableremote" name
-		gc <- maybe def Remote.gitconfig <$> Remote.byUUID u
-		next $ perform t u fullconfig gc
+	matchingname r = Git.remoteName r == Just name
+	go [] = startSpecialRemote name (Logs.Remote.keyValToConfig rest)
+		=<< Annex.SpecialRemote.findExisting name
+	go (r:_) = startNormalRemote name r
+
+type RemoteName = String
+
+startNormalRemote :: RemoteName -> Git.Repo -> CommandStart
+startNormalRemote name r = do
+	showStart "enableremote" name
+	next $ next $ do
+		r' <- Remote.Git.configRead False r
+		u <- getRepoUUID r'
+		return (u /= NoUUID)
+
+startSpecialRemote :: RemoteName -> Remote.RemoteConfig -> Maybe (UUID, Remote.RemoteConfig) -> CommandStart
+startSpecialRemote name config Nothing = do
+	m <- Annex.SpecialRemote.specialRemoteMap
+	confm <- Logs.Remote.readRemoteLog
+	v <- Remote.nameToUUID' name
+	case v of
+		Right u | u `M.member` m ->
+			startSpecialRemote name config $
+				Just (u, fromMaybe M.empty (M.lookup u confm))
+		_ -> unknownNameError "Unknown remote name."
+startSpecialRemote name config (Just (u, c)) = do
+	let fullconfig = config `M.union` c	
+	t <- either error return (Annex.SpecialRemote.findType fullconfig)
+	showStart "enableremote" name
+	gc <- maybe def Remote.gitconfig <$> Remote.byUUID u
+	next $ performSpecialRemote t u fullconfig gc
+
+performSpecialRemote :: RemoteType -> UUID -> R.RemoteConfig -> RemoteGitConfig -> CommandPerform
+performSpecialRemote t u c gc = do
+	(c', u') <- R.setup t (Just u) Nothing c gc
+	next $ cleanupSpecialRemote u' c'
+
+cleanupSpecialRemote :: UUID -> R.RemoteConfig -> CommandCleanup
+cleanupSpecialRemote u c = do
+	Logs.Remote.configSet u c
+	return True
 
 unknownNameError :: String -> Annex a
 unknownNameError prefix = do
 	m <- Annex.SpecialRemote.specialRemoteMap
 	descm <- M.unionWith Remote.addName <$> uuidMap <*> pure m
-	msg <- if M.null m
+	specialmsg <- if M.null m
 			then pure "(No special remotes are currently known; perhaps use initremote instead?)"
 			else Remote.prettyPrintUUIDsDescs
 				"known special remotes"
 				descm (M.keys m)
-	error $ prefix ++ "\n" ++ msg
-
-perform :: RemoteType -> UUID -> R.RemoteConfig -> RemoteGitConfig -> CommandPerform
-perform t u c gc = do
-	(c', u') <- R.setup t (Just u) Nothing c gc
-	next $ cleanup u' c'
-
-cleanup :: UUID -> R.RemoteConfig -> CommandCleanup
-cleanup u c = do
-	Logs.Remote.configSet u c
-	return True
+	nouuids <- filterM (\r -> (==) NoUUID <$> getRepoUUID r)
+		=<< Annex.fromRepo Git.remotes
+	let nouuidmsg = unlines $ map ("\t" ++) $
+		mapMaybe Git.remoteName nouuids
+	error $ concat $ filter (not . null) [prefix ++ "\n", nouuidmsg, specialmsg]

doc/git-annex-enableremote.mdwn

@@ -1,6 +1,6 @@
 # NAME
 
-git-annex enableremote - enables use of an existing special remote
+git-annex enableremote - enables git-annex to use a remote
 
 # SYNOPSIS
 
@@ -8,15 +8,22 @@ git annex enableremote `name|uuid|desc [param=value ...]`
 
 # DESCRIPTION
 
-Enables use of an existing special remote in the current repository,
-which may be a different repository than the one in which it was
-originally created with the initremote command.
+Enables use of an existing remote in the current repository.
 
-The name of the remote is the same name used when originally
+This is often used to enable use of a special (non-git) remote, by
+a different repository than the one in which it was
+originally created with the initremote command. 
+
+It can also be used to explicitly enable a git remote,
+so that git-annex can store the contents of files there. First
+run `git remote add`, and then `git annex enableremote` with the name of
+the remote.
+
+When enabling a special remote, specify the same name used when originally
 creating that remote with `git annex initremote`. Run 
 `git annex enableremote` without any name to get a list of
 special remote names. Or you can specify the uuid or description of the
-remote.
+special remote.
   
 Some special remotes may need parameters to be specified every time they are
 enabled. For example, the directory special remote requires a directory=