git-annex-shell: Make configlist automatically initialize a remote git repository, as long as a git-annex branch has been pushed to it, to simplify setup of remote git repositories, including via gitolite.

Command/ConfigList.hs

@@ -1,6 +1,6 @@
 {- git-annex command
  -
- - Copyright 2010 Joey Hess <joey@kitenet.net>
+ - Copyright 2010-2014 Joey Hess <joey@kitenet.net>
  -
  - Licensed under the GNU GPL version 3 or higher.
  -}
@@ -10,6 +10,8 @@ module Command.ConfigList where
 import Common.Annex
 import Command
 import Annex.UUID
+import Annex.Init
+import qualified Annex.Branch
 import qualified Git.Config
 import Remote.GCrypt (coreGCryptId)
 
@@ -22,9 +24,23 @@ seek = withNothing start
 
 start :: CommandStart
 start = do
-	u <- getUUID
+	u <- findOrGenUUID
 	showConfig "annex.uuid" $ fromUUID u
 	showConfig coreGCryptId =<< fromRepo (Git.Config.get coreGCryptId "")
 	stop
   where
   	showConfig k v = liftIO $ putStrLn $ k ++ "=" ++ v
+
+{- The repository may not yet have a UUID; automatically initialize it
+ - when there's a git-annex branch available. -}
+findOrGenUUID :: Annex UUID
+findOrGenUUID = do
+	u <- getUUID
+	if u /= NoUUID
+		then return u
+		else ifM Annex.Branch.hasSibling
+			( do
+				initialize Nothing
+				getUUID
+			, return NoUUID
+			)