Improve startup time for commands that do not operate on remotes

And for tab completion, by not unnessessarily statting paths to remotes,
which used to cause eg, spin-up of removable drives.

Got rid of the remotes member of Git.Repo. This was a bit painful.

Remote.Git modifies the list of remotes as it reads their configs,
so still need a persistent list of remotes. So, put it in as
Annex.gitremotes. It's only populated by getGitRemotes, so commands
like examinekey that don't care about remotes won't do so.

This commit was sponsored by Jake Vosloo on Patreon.

Git/Config.hs

@@ -13,8 +13,8 @@ import Data.Char
 import Common
 import Git
 import Git.Types
-import qualified Git.Construct
 import qualified Git.Command
+import qualified Git.Construct
 import Utility.UserInfo
 
 {- Returns a single git config setting, or a default value if not set. -}
@@ -89,12 +89,10 @@ hRead repo h = do
 store :: String -> Repo -> IO Repo
 store s repo = do
 	let c = parse s
-	repo' <- updateLocation $ repo
+	updateLocation $ repo
 		{ config = (M.map Prelude.head c) `M.union` config repo
 		, fullconfig = M.unionWith (++) c (fullconfig repo)
 		}
-	rs <- Git.Construct.fromRemotes repo'
-	return $ repo' { remotes = rs }
 
 {- Updates the location of a repo, based on its configuration.
  -

Git/Construct.hs

@@ -127,8 +127,7 @@ fromRemotes repo = mapM construct remotepairs
   where
 	filterconfig f = filter f $ M.toList $ config repo
 	filterkeys f = filterconfig (\(k,_) -> f k)
-	remotepairs = filterkeys isremote
-	isremote k = "remote." `isPrefixOf` k && ".url" `isSuffixOf` k
+	remotepairs = filterkeys isRemoteKey
 	construct (k,v) = remoteNamedFromKey k $ fromRemoteLocation v repo
 
 {- Sets the name of a remote when constructing the Repo to represent it. -}
@@ -140,10 +139,7 @@ remoteNamed n constructor = do
 {- Sets the name of a remote based on the git config key, such as
  - "remote.foo.url". -}
 remoteNamedFromKey :: String -> IO Repo -> IO Repo
-remoteNamedFromKey k = remoteNamed basename
-  where
-	basename = intercalate "." $ 
-		reverse $ drop 1 $ reverse $ drop 1 $ splitc '.' k
+remoteNamedFromKey = remoteNamed . remoteKeyToRemoteName
 
 {- Constructs a new Repo for one of a Repo's remotes using a given
  - location (ie, an url). -}
@@ -233,7 +229,6 @@ newFrom l = Repo
 	{ location = l
 	, config = M.empty
 	, fullconfig = M.empty
-	, remotes = []
 	, remoteName = Nothing
 	, gitEnv = Nothing
 	, gitEnvOverridesGitDir = False

Git/Remote.hs

@@ -20,6 +20,15 @@ import Network.URI
 import Git.FilePath
 #endif
 
+{- Is a git config key one that specifies the location of a remote? -}
+isRemoteKey :: String -> Bool
+isRemoteKey k = "remote." `isPrefixOf` k && ".url" `isSuffixOf` k
+
+{- Get a remote's name from the config key that specifies its location. -}
+remoteKeyToRemoteName :: String -> RemoteName
+remoteKeyToRemoteName k = intercalate "." $
+	reverse $ drop 1 $ reverse $ drop 1 $ splitc '.' k
+
 {- Construct a legal git remote name out of an arbitrary input string.
  -
  - There seems to be no formal definition of this in the git source,

Git/Repair.hs

@@ -11,7 +11,6 @@ module Git.Repair (
 	removeBadBranches,
 	successfulRepair,
 	cleanCorruptObjects,
-	retrieveMissingObjects,
 	resetLocalBranches,
 	checkIndex,
 	checkIndexFast,
@@ -102,10 +101,11 @@ retrieveMissingObjects missing referencerepo r
 		unlessM (boolSystem "git" [Param "init", File tmpdir]) $
 			error $ "failed to create temp repository in " ++ tmpdir
 		tmpr <- Config.read =<< Construct.fromAbsPath tmpdir
-		stillmissing <- pullremotes tmpr (remotes r) fetchrefstags missing
+		rs <- Construct.fromRemotes r
+		stillmissing <- pullremotes tmpr rs fetchrefstags missing
 		if S.null (knownMissing stillmissing)
 			then return stillmissing
-			else pullremotes tmpr (remotes r) fetchallrefs stillmissing
+			else pullremotes tmpr rs fetchallrefs stillmissing
   where
 	pullremotes tmpr [] fetchrefs stillmissing = case referencerepo of
 		Nothing -> return stillmissing

Git/Types.hs

@@ -34,8 +34,8 @@ data Repo = Repo
 	, config :: M.Map String String
 	-- a given git config key can actually have multiple values
 	, fullconfig :: M.Map String [String]
-	, remotes :: [Repo]
-	-- remoteName holds the name used for this repo in remotes
+	-- remoteName holds the name used for this repo in some other
+	-- repo's list of remotes, when this repo is such a remote
 	, remoteName :: Maybe RemoteName
 	-- alternate environment to use when running git commands
 	, gitEnv :: Maybe [(String, String)]