From a3835f508d4a441c64156d4669378e080064d4bf Mon Sep 17 00:00:00 2001
From: Scott Worley <scottworley@scottworley.com>
Date: Mon, 3 Jun 2024 02:29:13 -0700
Subject: [PATCH 1/1] Use a specific Exception type

---
 Changelog    | 1 +
 git_cache.py | 7 ++++++-
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/Changelog b/Changelog
index 8569763..eeaebfb 100644
--- a/Changelog
+++ b/Changelog
@@ -1,4 +1,5 @@
 ## [Unreleased]
+- Use a specific Exception type
 
 
 ## [1.4.3] - 2023-05-24
diff --git a/git_cache.py b/git_cache.py
index a34c329..8171b48 100644
--- a/git_cache.py
+++ b/git_cache.py
@@ -24,6 +24,11 @@ from typing import Iterator, NamedTuple, Optional, TypeVar, Tuple, Union
 
 import backoff
 
+
+class GitCacheError(Exception):
+    pass
+
+
 Path = str   # eg: "/home/user/.cache/git-cache/v1"
 Repo = str   # eg: "https://github.com/NixOS/nixpkgs.git"
 Ref = str    # eg: "master" or "v1.0.0"
@@ -85,7 +90,7 @@ def verify_ancestry(
         ancestor: RefOrRev,
         force: bool = False) -> None:
     if not force and not is_ancestor(repo, descendant, ancestor):
-        raise Exception(f'{ancestor} is not an ancestor of {descendant}')
+        raise GitCacheError(f'{ancestor} is not an ancestor of {descendant}')
 
 
 def _read_fetch_log(repo: Repo) -> Iterator[_LogEntry]:
-- 
2.44.1