[PATCH 13/18] unpack-trees: pass old oid to verify_clean_submodule

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The check (which uses the old oid) is yet to be implemented, but this part
is just a refactor, so it can go separately first.

Signed-off-by: Stefan Beller <sbeller@xxxxxxxxxx>
---
 unpack-trees.c | 17 ++++++++++-------
 1 file changed, 10 insertions(+), 7 deletions(-)

diff --git a/unpack-trees.c b/unpack-trees.c
index 3a8ee19fe8..616a0ae4b2 100644
--- a/unpack-trees.c
+++ b/unpack-trees.c
@@ -1407,7 +1407,8 @@ static void invalidate_ce_path(const struct cache_entry *ce,
  * Currently, git does not checkout subprojects during a superproject
  * checkout, so it is not going to overwrite anything.
  */
-static int verify_clean_submodule(const struct cache_entry *ce,
+static int verify_clean_submodule(const char *old_sha1,
+				  const struct cache_entry *ce,
 				  enum unpack_trees_error_types error_type,
 				  struct unpack_trees_options *o)
 {
@@ -1427,16 +1428,18 @@ static int verify_clean_subdirectory(const struct cache_entry *ce,
 	struct dir_struct d;
 	char *pathbuf;
 	int cnt = 0;
-	unsigned char sha1[20];
 
-	if (S_ISGITLINK(ce->ce_mode) &&
-	    resolve_gitlink_ref(ce->name, "HEAD", sha1) == 0) {
-		/* If we are not going to update the submodule, then
+	if (S_ISGITLINK(ce->ce_mode)) {
+		unsigned char sha1[20];
+		int sub_head = resolve_gitlink_ref(ce->name, "HEAD", sha1);
+		/*
+		 * If we are not going to update the submodule, then
 		 * we don't care.
 		 */
-		if (!hashcmp(sha1, ce->oid.hash))
+		if (!sub_head && !hashcmp(sha1, ce->oid.hash))
 			return 0;
-		return verify_clean_submodule(ce, error_type, o);
+		return verify_clean_submodule(sub_head ? NULL : sha1_to_hex(sha1),
+					      ce, error_type, o);
 	}
 
 	/*
-- 
2.12.0.rc1.52.ge239d7e709.dirty




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