thodg/libgit2

diff --git a/src/branch.c b/src/branch.c
index c7651c6..133d6f6 100644
--- a/src/branch.c
+++ b/src/branch.c
@@ -59,8 +59,9 @@ int git_branch_create(
 	const char *log_message)
 {
 	git_reference *branch = NULL;
-	git_buf canonical_branch_name = GIT_BUF_INIT;
-	int error = 0;
+	git_buf canonical_branch_name = GIT_BUF_INIT,
+			  log_message_buf = GIT_BUF_INIT;
+	int error = -1;
 
 	assert(branch_name && commit && ref_out);
 	assert(git_object_owner((const git_object *)commit) == repository);
@@ -68,12 +69,19 @@ int git_branch_create(
 	if (git_buf_joinpath(&canonical_branch_name, GIT_REFS_HEADS_DIR, branch_name) < 0)
 		goto cleanup;
 
-	if (!(error = git_reference_create(&branch, repository,
-		git_buf_cstr(&canonical_branch_name), git_commit_id(commit), force, signature, log_message)))
+	if (git_buf_sets(&log_message_buf, log_message ? log_message : "Branch: created") < 0)
+		goto cleanup;
+
+	error = git_reference_create(&branch, repository,
+		git_buf_cstr(&canonical_branch_name), git_commit_id(commit), force, signature,
+		git_buf_cstr(&log_message_buf));
+
+	if (!error)
 		*ref_out = branch;
 
 cleanup:
 	git_buf_free(&canonical_branch_name);
+	git_buf_free(&log_message_buf);
 	return error;
 }
 
@@ -195,8 +203,9 @@ int git_branch_move(
 	const char *log_message)
 {
 	git_buf new_reference_name = GIT_BUF_INIT,
-		old_config_section = GIT_BUF_INIT,
-		new_config_section = GIT_BUF_INIT;
+	        old_config_section = GIT_BUF_INIT,
+	        new_config_section = GIT_BUF_INIT,
+	        log_message_buf = GIT_BUF_INIT;
 	int error;
 
 	assert(branch && new_branch_name);
@@ -204,15 +213,23 @@ int git_branch_move(
 	if (!git_reference_is_branch(branch))
 		return not_a_local_branch(git_reference_name(branch));
 
-	error = git_buf_joinpath(&new_reference_name, GIT_REFS_HEADS_DIR, new_branch_name);
-	if (error < 0)
+	if ((error = git_buf_joinpath(&new_reference_name, GIT_REFS_HEADS_DIR, new_branch_name)) < 0)
 		goto done;
 
+	if (log_message) {
+		if ((error = git_buf_sets(&log_message_buf, log_message)) < 0)
+			goto done;
+	} else {
+		if ((error = git_buf_printf(&log_message_buf, "Branch: renamed %s to %s",
+						git_reference_name(branch), git_buf_cstr(&new_reference_name))) < 0)
+			goto done;
+	}
+
 	/* first update ref then config so failure won't trash config */
 
 	error = git_reference_rename(
 		out, branch, git_buf_cstr(&new_reference_name), force,
-		signature, log_message);
+		signature, git_buf_cstr(&log_message_buf));
 	if (error < 0)
 		goto done;
 
@@ -229,6 +246,7 @@ done:
 	git_buf_free(&new_reference_name);
 	git_buf_free(&old_config_section);
 	git_buf_free(&new_config_section);
+	git_buf_free(&log_message_buf);
 
 	return error;
 }
diff --git a/tests/refs/branches/create.c b/tests/refs/branches/create.c
index 0c0fdb0..32e17d6 100644
--- a/tests/refs/branches/create.c
+++ b/tests/refs/branches/create.c
@@ -86,4 +86,21 @@ void test_refs_branches_create__creation_creates_new_reflog(void)
 	cl_assert_equal_i(1, git_reflog_entrycount(log));
 	entry = git_reflog_entry_byindex(log, 0);
 	cl_assert_equal_s("create!", git_reflog_entry_message(entry));
+
+	git_reflog_free(log);
+}
+
+void test_refs_branches_create__default_reflog_message(void)
+{
+	git_reflog *log;
+	const git_reflog_entry *entry;
+
+	retrieve_known_commit(&target, repo);
+	cl_git_pass(git_branch_create(&branch, repo, NEW_BRANCH_NAME, target, false, NULL, NULL));
+	cl_git_pass(git_reflog_read(&log, repo, "refs/heads/" NEW_BRANCH_NAME));
+
+	entry = git_reflog_entry_byindex(log, 0);
+	cl_assert_equal_s("Branch: created", git_reflog_entry_message(entry));
+
+	git_reflog_free(log);
 }
diff --git a/tests/refs/branches/move.c b/tests/refs/branches/move.c
index 0bdb58a..622921d 100644
--- a/tests/refs/branches/move.c
+++ b/tests/refs/branches/move.c
@@ -205,3 +205,24 @@ void test_refs_branches_move__updates_the_reflog(void)
 	git_reference_free(new_branch);
 	git_reflog_free(log);
 }
+
+void test_refs_branches_move__default_reflog_message(void)
+{
+	git_reference *branch;
+	git_reference *new_branch;
+	git_reflog *log;
+	const git_reflog_entry *entry;
+
+	cl_git_pass(git_reference_lookup(&branch, repo, "refs/heads/master"));
+	cl_git_pass(git_branch_move(&new_branch, branch, "master2", 0, NULL, NULL));
+
+	cl_git_pass(git_reflog_read(&log, repo, git_reference_name(new_branch)));
+	entry = git_reflog_entry_byindex(log, 0);
+	cl_assert_equal_s("Branch: renamed refs/heads/master to refs/heads/master2",
+			git_reflog_entry_message(entry));
+
+	git_reference_free(branch);
+	git_reference_free(new_branch);
+	git_reflog_free(log);
+
+}