[PATCH 1/2] submodule.c: convert submodule_move_head new argument to object id

[Stefan Beller <sbeller@google.com>]

All callers use oid_to_hex to convert the desired oid to a string before
calling submodule_move_head. Defer the conversion to the
submodule_move_head as it will turn out to be useful in a bit.

Signed-off-by: Stefan Beller <sbeller@google.com>
---

This is also part of the other series sent out yesterday, 
https://public-inbox.org/git/20180904230149.180332-5-sbeller@google.com/

 entry.c        |  6 +++---
 submodule.c    | 12 ++++++------
 submodule.h    |  2 +-
 unpack-trees.c | 13 +++++--------
 4 files changed, 15 insertions(+), 18 deletions(-)

diff --git a/entry.c b/entry.c
index 2a2ab6c8394..0b676f997b2 100644
--- a/entry.c
+++ b/entry.c
@@ -358,7 +358,7 @@ static int write_entry(struct cache_entry *ce,
 		sub = submodule_from_ce(ce);
 		if (sub)
 			return submodule_move_head(ce->name,
-				NULL, oid_to_hex(&ce->oid),
+				NULL, &ce->oid,
 				state->force ? SUBMODULE_MOVE_HEAD_FORCE : 0);
 		break;
 
@@ -439,10 +439,10 @@ int checkout_entry(struct cache_entry *ce,
 					unlink_or_warn(ce->name);
 
 				return submodule_move_head(ce->name,
-					NULL, oid_to_hex(&ce->oid), 0);
+					NULL, &ce->oid, 0);
 			} else
 				return submodule_move_head(ce->name,
-					"HEAD", oid_to_hex(&ce->oid),
+					"HEAD", &ce->oid,
 					state->force ? SUBMODULE_MOVE_HEAD_FORCE : 0);
 		}
 
diff --git a/submodule.c b/submodule.c
index 50cbf5f13ed..da2ed8696f5 100644
--- a/submodule.c
+++ b/submodule.c
@@ -1597,9 +1597,9 @@ static void submodule_reset_index(const char *path)
  * pass NULL for old or new respectively.
  */
 int submodule_move_head(const char *path,
-			 const char *old_head,
-			 const char *new_head,
-			 unsigned flags)
+			const char *old_head,
+			const struct object_id *new_oid,
+			unsigned flags)
 {
 	int ret = 0;
 	struct child_process cp = CHILD_PROCESS_INIT;
@@ -1679,7 +1679,7 @@ int submodule_move_head(const char *path,
 	if (!(flags & SUBMODULE_MOVE_HEAD_FORCE))
 		argv_array_push(&cp.args, old_head ? old_head : empty_tree_oid_hex());
 
-	argv_array_push(&cp.args, new_head ? new_head : empty_tree_oid_hex());
+	argv_array_push(&cp.args, new_oid ? oid_to_hex(new_oid) : empty_tree_oid_hex());
 
 	if (run_command(&cp)) {
 		ret = error(_("Submodule '%s' could not be updated."), path);
@@ -1687,7 +1687,7 @@ int submodule_move_head(const char *path,
 	}
 
 	if (!(flags & SUBMODULE_MOVE_HEAD_DRY_RUN)) {
-		if (new_head) {
+		if (new_oid) {
 			child_process_init(&cp);
 			/* also set the HEAD accordingly */
 			cp.git_cmd = 1;
@@ -1696,7 +1696,7 @@ int submodule_move_head(const char *path,
 
 			prepare_submodule_repo_env(&cp.env_array);
 			argv_array_pushl(&cp.args, "update-ref", "HEAD",
-					 "--no-deref", new_head, NULL);
+					 "--no-deref", oid_to_hex(new_oid), NULL);
 
 			if (run_command(&cp)) {
 				ret = -1;
diff --git a/submodule.h b/submodule.h
index 7d476cefa7e..ef34d5a7ca8 100644
--- a/submodule.h
+++ b/submodule.h
@@ -124,7 +124,7 @@ int submodule_to_gitdir(struct strbuf *buf, const char *submodule);
 #define SUBMODULE_MOVE_HEAD_FORCE   (1<<1)
 int submodule_move_head(const char *path,
 			const char *old,
-			const char *new_head,
+			const struct object_id *new_oid,
 			unsigned flags);
 
 void submodule_unset_core_worktree(const struct submodule *sub);
diff --git a/unpack-trees.c b/unpack-trees.c
index f25089b878a..75d1b294ade 100644
--- a/unpack-trees.c
+++ b/unpack-trees.c
@@ -256,7 +256,7 @@ static void display_error_msgs(struct unpack_trees_options *o)
 
 static int check_submodule_move_head(const struct cache_entry *ce,
 				     const char *old_id,
-				     const char *new_id,
+				     const struct object_id *new_id,
 				     struct unpack_trees_options *o)
 {
 	unsigned flags = SUBMODULE_MOVE_HEAD_DRY_RUN;
@@ -1517,7 +1517,7 @@ static int verify_uptodate_1(const struct cache_entry *ce,
 
 		if (submodule_from_ce(ce)) {
 			int r = check_submodule_move_head(ce,
-				"HEAD", oid_to_hex(&ce->oid), o);
+				"HEAD", &ce->oid, o);
 			if (r)
 				return o->gently ? -1 :
 					add_rejected_path(o, error_type, ce->name);
@@ -1591,8 +1591,7 @@ static int verify_clean_submodule(const char *old_sha1,
 	if (!submodule_from_ce(ce))
 		return 0;
 
-	return check_submodule_move_head(ce, old_sha1,
-					 oid_to_hex(&ce->oid), o);
+	return check_submodule_move_head(ce, old_sha1, &ce->oid, o);
 }
 
 static int verify_clean_subdirectory(const struct cache_entry *ce,
@@ -1836,8 +1835,7 @@ static int merged_entry(const struct cache_entry *ce,
 
 		if (submodule_from_ce(ce)) {
 			int ret = check_submodule_move_head(ce, NULL,
-							    oid_to_hex(&ce->oid),
-							    o);
+							    &ce->oid, o);
 			if (ret)
 				return ret;
 		}
@@ -1865,8 +1863,7 @@ static int merged_entry(const struct cache_entry *ce,
 
 		if (submodule_from_ce(ce)) {
 			int ret = check_submodule_move_head(ce, oid_to_hex(&old->oid),
-							    oid_to_hex(&ce->oid),
-							    o);
+							    &ce->oid, o);
 			if (ret)
 				return ret;
 		}
-- 
2.19.0.rc2.392.g5ba43deb5a-goog