add SetupStage parameter to RemoteType.setup

Most remotes have an idempotent setup that can be reused for
enableremote, but in a few cases, it needs to tell which, and whether
a UUID was provided to setup was used.

This is groundwork for making initremote be able to provide a UUID.
It should not change any behavior.

Note that it would be nice to make the UUID always be provided to setup,
and make setup not need to generate and return a UUID. What prevented
this simplification is Remote.Git.gitSetup, which needs to reuse the
UUID of the git remote when setting it up, and so has to return that
UUID.

This commit was sponsored by Thom May on Patreon.

Types/Remote.hs

@@ -14,6 +14,7 @@ module Types.Remote
 	, RemoteConfig
 	, RemoteTypeA(..)
 	, RemoteA(..)
+	, SetupStage(..)
 	, Availability(..)
 	, Verification(..)
 	, unVerified
@@ -38,8 +39,12 @@ import Utility.SafeCommand
 import Utility.Url
 
 type RemoteConfigKey = String
+
 type RemoteConfig = M.Map RemoteConfigKey String
 
+data SetupStage = Init | Enable
+	deriving (Eq)
+
 {- There are different types of remotes. -}
 data RemoteTypeA a = RemoteType {
 	-- human visible type name
@@ -49,8 +54,8 @@ data RemoteTypeA a = RemoteType {
 	enumerate :: Bool -> a [Git.Repo],
 	-- generates a remote of this type
 	generate :: Git.Repo -> UUID -> RemoteConfig -> RemoteGitConfig -> a (Maybe (RemoteA a)),
-	-- initializes or changes a remote
-	setup :: Maybe UUID -> Maybe CredPair -> RemoteConfig -> RemoteGitConfig -> a (RemoteConfig, UUID)
+	-- initializes or enables a remote
+	setup :: SetupStage -> Maybe UUID -> Maybe CredPair -> RemoteConfig -> RemoteGitConfig -> a (RemoteConfig, UUID)
 }
 
 instance Eq (RemoteTypeA a) where