unpack-trees: don't respect submodule.update

The 'submodule.update' config was historically used and respected by the
'submodule update' command because update handled a variety of different
ways it updated a submodule.  As we begin teaching other commands about
submodules it makes more sense for the different settings of
'submodule.update' to be handled by the individual commands themselves
(checkout, rebase, merge, etc) so it shouldn't be respected by the
native checkout command.

Also remove the overlaying of the repository's config (via using
'submodule_config()') from the commands which use the unpack-trees
logic (checkout, read-tree, reset).

Signed-off-by: Brandon Williams <bmwill@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

3 files changed, 9 insertions, 32 deletions

diff --git a/builtin/checkout.c b/builtin/checkout.c
index 9661e1bcba..246e0cd166 100644
--- a/builtin/checkout.c
+++ b/builtin/checkout.c
@@ -858,7 +858,7 @@ static int git_checkout_config(const char *var, const char *value, void *cb)
 	}
 
 	if (starts_with(var, "submodule."))
-		return submodule_config(var, value, NULL);
+		return git_default_submodule_config(var, value, NULL);
 
 	return git_xmerge_config(var, value, NULL);
 }
diff --git a/submodule.c b/submodule.c
index a32043893b..f913c23415 100644
--- a/submodule.c
+++ b/submodule.c
@@ -235,7 +235,6 @@ void load_submodule_cache(void)
 		return;
 
 	gitmodules_config();
-	git_config(submodule_config, NULL);
 }
 
 static int gitmodules_cb(const char *var, const char *value, void *data)
diff --git a/unpack-trees.c b/unpack-trees.c
index 05335fe5bf..5dce7ff7d4 100644
--- a/unpack-trees.c
+++ b/unpack-trees.c
@@ -255,28 +255,17 @@ static int check_submodule_move_head(const struct cache_entry *ce,
 {
 	unsigned flags = SUBMODULE_MOVE_HEAD_DRY_RUN;
 	const struct submodule *sub = submodule_from_ce(ce);
+
 	if (!sub)
 		return 0;
 
 	if (o->reset)
 		flags |= SUBMODULE_MOVE_HEAD_FORCE;
 
-	switch (sub->update_strategy.type) {
-	case SM_UPDATE_UNSPECIFIED:
-	case SM_UPDATE_CHECKOUT:
-		if (submodule_move_head(ce->name, old_id, new_id, flags))
-			return o->gently ? -1 :
-				add_rejected_path(o, ERROR_WOULD_LOSE_SUBMODULE, ce->name);
-		return 0;
-	case SM_UPDATE_NONE:
-		return 0;
-	case SM_UPDATE_REBASE:
-	case SM_UPDATE_MERGE:
-	case SM_UPDATE_COMMAND:
-	default:
-		warning(_("submodule update strategy not supported for submodule '%s'"), ce->name);
-		return -1;
-	}
+	if (submodule_move_head(ce->name, old_id, new_id, flags))
+		return o->gently ? -1 :
+				   add_rejected_path(o, ERROR_WOULD_LOSE_SUBMODULE, ce->name);
+	return 0;
 }
 
 static void reload_gitmodules_file(struct index_state *index,
@@ -293,7 +282,6 @@ static void reload_gitmodules_file(struct index_state *index,
 				submodule_free();
 				checkout_entry(ce, state, NULL);
 				gitmodules_config();
-				git_config(submodule_config, NULL);
 			} else
 				break;
 		}
@@ -308,19 +296,9 @@ static void unlink_entry(const struct cache_entry *ce)
 {
 	const struct submodule *sub = submodule_from_ce(ce);
 	if (sub) {
-		switch (sub->update_strategy.type) {
-		case SM_UPDATE_UNSPECIFIED:
-		case SM_UPDATE_CHECKOUT:
-		case SM_UPDATE_REBASE:
-		case SM_UPDATE_MERGE:
-			/* state.force is set at the caller. */
-			submodule_move_head(ce->name, "HEAD", NULL,
-					    SUBMODULE_MOVE_HEAD_FORCE);
-			break;
-		case SM_UPDATE_NONE:
-		case SM_UPDATE_COMMAND:
-			return; /* Do not touch the submodule. */
-		}
+		/* state.force is set at the caller. */
+		submodule_move_head(ce->name, "HEAD", NULL,
+				    SUBMODULE_MOVE_HEAD_FORCE);
 	}
 	if (!check_leading_path(ce->name, ce_namelen(ce)))
 		return;