Merge branch 'issue-4203'

src/merge.c

@@ -3243,7 +3243,7 @@ int git_merge(
 	git_reference *our_ref = NULL;
 	git_checkout_options checkout_opts;
 	git_annotated_commit *our_head = NULL, *base = NULL;
-	git_index *index = NULL;
+	git_index *repo_index = NULL, *index = NULL;
 	git_indexwriter indexwriter = GIT_INDEXWRITER_INIT;
 	unsigned int checkout_strategy;
 	int error = 0;
@@ -3266,6 +3266,10 @@ int git_merge(
 		&checkout_strategy)) < 0)
 		goto done;
 
+	if ((error = git_repository_index(&repo_index, repo) < 0) ||
+	    (error = git_index_read(repo_index, 0) < 0))
+		goto done;
+
 	/* Write the merge setup files to the repository. */
 	if ((error = git_annotated_commit_from_head(&our_head, repo)) < 0 ||
 		(error = git_merge__setup(repo, our_head, their_heads,
@@ -3299,6 +3303,7 @@ done:
 	git_annotated_commit_free(our_head);
 	git_annotated_commit_free(base);
 	git_reference_free(our_ref);
+	git_index_free(repo_index);
 
 	return error;
 }

tests/merge/workdir/simple.c

@@ -168,6 +168,35 @@ void test_merge_workdir_simple__automerge(void)
 	git_index_free(index);
 }
 
+void test_merge_workdir_simple__index_reload(void)
+{
+	git_repository *tmp_repo;
+	git_annotated_commit *their_heads[1];
+	git_oid their_oid;
+	git_index_entry entry = {{0}};
+	git_index *tmp_index;
+
+	cl_git_pass(git_repository_open(&tmp_repo, git_repository_workdir(repo)));
+	cl_git_pass(git_repository_index(&tmp_index, tmp_repo));
+	cl_git_pass(git_index_read(repo_index, 0));
+
+	entry.mode = GIT_FILEMODE_BLOB;
+	cl_git_pass(git_oid_fromstr(&entry.id, "11deab00b2d3a6f5a3073988ac050c2d7b6655e2"));
+	entry.path = "automergeable.txt";
+	cl_git_pass(git_index_add(repo_index, &entry));
+
+	cl_git_pass(git_index_add_bypath(tmp_index, "automergeable.txt"));
+	cl_git_pass(git_index_write(tmp_index));
+
+	cl_git_pass(git_oid_fromstr(&their_oid, THEIRS_SIMPLE_OID));
+	cl_git_pass(git_annotated_commit_lookup(&their_heads[0], repo, &their_oid));
+	cl_git_pass(git_merge(repo, (const git_annotated_commit **)their_heads, 1, NULL, NULL));
+
+	git_index_free(tmp_index);
+	git_repository_free(tmp_repo);
+	git_annotated_commit_free(their_heads[0]);
+}
+
 void test_merge_workdir_simple__automerge_crlf(void)
 {
 #ifdef GIT_WIN32