Better error message when trying to use a git remote that has annex.ignore set.

Config.hs

@@ -18,6 +18,9 @@ import Config.Cost
 type UnqualifiedConfigKey = String
 data ConfigKey = ConfigKey String
 
+instance Show ConfigKey where
+	show (ConfigKey s) = s
+
 {- Looks up a setting in git config. -}
 getConfig :: ConfigKey -> String -> Annex String
 getConfig (ConfigKey key) def = fromRepo $ Git.Config.get key def

Remote.hs

@@ -55,6 +55,7 @@ import Logs.UUID
 import Logs.Trust
 import Logs.Location hiding (logStatus)
 import Remote.List
+import Config
 
 {- Map from UUIDs of Remotes to a calculated value. -}
 remoteMap :: (Remote -> a) -> Annex (M.Map UUID a)
@@ -81,13 +82,16 @@ byName (Just n) = either error Just <$> byName' n
 
 {- Like byName, but the remote must have a configured UUID. -}
 byNameWithUUID :: Maybe String -> Annex (Maybe Remote)
-byNameWithUUID n = do
-	v <- byName n
-	return $ checkuuid <$> v
+byNameWithUUID = checkuuid <=< byName
   where
-	checkuuid r
-		| uuid r == NoUUID = error $ "cannot determine uuid for " ++ name r
-		| otherwise = r
+  	checkuuid Nothing = return Nothing
+	checkuuid (Just r)
+		| uuid r == NoUUID = do
+			let e = "cannot determine uuid for " ++ name r
+			if remoteAnnexIgnore (gitconfig r)
+				then error $ e ++ " (" ++ show (remoteConfig (repo r) "ignore") ++ " is set)"
+				else error e
+		| otherwise = return $ Just r
 
 byName' :: String -> Annex (Either String Remote)
 byName' "" = return $ Left "no remote specified"

debian/changelog

@@ -10,6 +10,8 @@ git-annex (4.20130816) UNRELEASED; urgency=low
   * Set --clobber when running wget to ensure resuming works properly.
   * unused: Pay attention to symlinks that are not yet staged in the index.
   * Unescape characters in 'file://...' URIs. (Thanks, guilhem for the patch.)
+  * Better error message when trying to use a git remote that has annex.ignore
+    set.
 
  -- Joey Hess <joeyh@debian.org>  Thu, 15 Aug 2013 15:47:52 +0200
 

doc/bugs/cannot_determine_uuid_for_origin.mdwn

@@ -120,3 +120,16 @@ Update: it seems te problem was that I had the following in my `.git/config`:
             fetch = +refs/heads/*:refs/remotes/marcos-bare/*
 
 I have *no* idea how that `annex-ignore` got there, but that was the root of my problem. Removing it it allowed my to do `git annex copy`. I really don't know how this happened, but I guess this is [[done]], although I believe this error message is really confusing and could be improved.
+
+> `annex-ignore` is set automatically by git-annex if it fails to query
+> the uuid of a remote the first time it tries to use it. It will say
+> when it does that. The assumption
+> is that a remote whose uuid cannot be looked up is a git remote
+> on a server w/o git-annex support (like github) and it would be annoying
+> to constantly be trying and failing to get that uuid.
+> 
+> So, I've improved the error message. Now when annex-ignore is set
+> for a remote, the error you got will mention that.
+> 
+> (Also, there is not currently anything lacking in git-annex's support
+> for bare repositories.) --[[Joey]]