#6422: handle dangling symbolic refs gracefully

src/libgit2/revwalk.c

@@ -121,8 +121,12 @@ int git_revwalk__push_ref(git_revwalk *walk, const char *refname, const git_revw
 {
 	git_oid oid;
 
-	if (git_reference_name_to_id(&oid, walk->repo, refname) < 0)
+	int error = git_reference_name_to_id(&oid, walk->repo, refname);
+	if (opts->from_glob && (error == GIT_ENOTFOUND || error == GIT_EINVALIDSPEC || error == GIT_EPEEL)) {
+		return 0;
+	} else if (error < 0) {
 		return -1;
+	}
 
 	return git_revwalk__push_commit(walk, &oid, opts);
 }

tests/libgit2/revwalk/basic.c

@@ -180,6 +180,23 @@ void test_revwalk_basic__glob_heads_with_invalid(void)
 	cl_assert_equal_i(20, i);
 }
 
+void test_revwalk_basic__glob_invalid_symbolic_ref(void)
+{
+	int i;
+	git_oid oid;
+
+	revwalk_basic_setup_walk("testrepo");
+
+	cl_git_mkfile("testrepo/.git/refs/heads/broken-sym-ref", "ref: refs/heads/does-not-exist");
+	cl_git_pass(git_revwalk_push_glob(_walk, "heads"));
+
+	for (i = 0; !git_revwalk_next(&oid, _walk); ++i)
+		/* walking */;
+
+	/* git log --branches --oneline | wc -l => 16 */
+	cl_assert_equal_i(20, i);
+}
+
 void test_revwalk_basic__push_head(void)
 {
 	int i = 0;