revparse: properly handle refnames containing a @

Fix #994

src/revparse.c

@@ -795,20 +795,24 @@ int git_revparse_single(git_object **out, git_repository *repo, const char *spec
 
 		case '@':
 		{
-			git_object *temp_object = NULL;
+			if (spec[pos+1] == '{') {
+				git_object *temp_object = NULL;
 
-			if ((error = extract_curly_braces_content(&buf, spec, &pos)) < 0)
-				goto cleanup;
+				if ((error = extract_curly_braces_content(&buf, spec, &pos)) < 0)
+					goto cleanup;
 
-			if ((error = ensure_base_rev_is_not_known_yet(base_rev, spec)) < 0)
-				goto cleanup;
+				if ((error = ensure_base_rev_is_not_known_yet(base_rev, spec)) < 0)
+					goto cleanup;
 
-			if ((error = handle_at_syntax(&temp_object, &reference, spec, identifier_len, repo, git_buf_cstr(&buf))) < 0)
-				goto cleanup;
+				if ((error = handle_at_syntax(&temp_object, &reference, spec, identifier_len, repo, git_buf_cstr(&buf))) < 0)
+					goto cleanup;
 
-			if (temp_object != NULL)
-				base_rev = temp_object;
-			break;
+				if (temp_object != NULL)
+					base_rev = temp_object;
+				break;
+			} else {
+				/* Fall through */
+			}
 		}
 
 		default:

tests-clar/refs/isvalidname.c

@@ -20,4 +20,5 @@ void test_refs_isvalidname__wont_hopefully_choke_on_valid_formats(void)
 	cl_assert_equal_i(true, git_reference_is_valid_name("HEAD"));
 	cl_assert_equal_i(true, git_reference_is_valid_name("ONE_LEVEL"));
 	cl_assert_equal_i(true, git_reference_is_valid_name("refs/stash"));
+	cl_assert_equal_i(true, git_reference_is_valid_name("refs/remotes/origin/bim_with_3d@11296"));
 }

tests-clar/refs/revparse.c

@@ -451,3 +451,37 @@ void test_refs_revparse__a_too_short_objectid_returns_EAMBIGUOUS(void)
 	
 	cl_assert_equal_i(GIT_EAMBIGUOUS, result);
 }
+
+void test_refs_revparse__issue_994(void)
+{
+	git_repository *repo;
+	git_reference *head, *with_at;
+	git_object *target;
+	
+	repo = cl_git_sandbox_init("testrepo.git");
+
+	cl_assert_equal_i(GIT_ENOTFOUND,
+		git_revparse_single(&target, repo, "origin/bim_with_3d@11296"));
+
+	cl_assert_equal_i(GIT_ENOTFOUND,
+		git_revparse_single(&target, repo, "refs/remotes/origin/bim_with_3d@11296"));
+
+
+	cl_git_pass(git_repository_head(&head, repo));
+	cl_git_pass(git_reference_create_oid(
+		&with_at,
+		repo,
+		"refs/remotes/origin/bim_with_3d@11296",
+		git_reference_oid(head),
+		0));
+
+	cl_git_pass(git_revparse_single(&target, repo, "origin/bim_with_3d@11296"));
+	git_object_free(target);
+
+	cl_git_pass(git_revparse_single(&target, repo, "refs/remotes/origin/bim_with_3d@11296"));
+	git_object_free(target);
+
+	git_reference_free(with_at);
+	git_reference_free(head);
+	cl_git_sandbox_cleanup();
+}