chore: update vendored libghostty-vt

refs #276

2 files changed, 46 insertions, 4 deletions

diff --git a/scripts/test_vendor_libghostty_vt.py b/scripts/test_vendor_libghostty_vt.py
index 9dcdbb2d..ad5c8d5e 100644
--- a/scripts/test_vendor_libghostty_vt.py
+++ b/scripts/test_vendor_libghostty_vt.py
@@ -8,7 +8,11 @@ import unittest
 from pathlib import Path
 from unittest import mock
 
-from scripts.vendor_libghostty_vt import ensure_dist_archive, parse_archive_root
+from scripts.vendor_libghostty_vt import (
+    ensure_dist_archive,
+    parse_archive_root,
+    require_clean_checkout,
+)
 
 
 class VendorLibghosttyVtTests(unittest.TestCase):
@@ -30,16 +34,44 @@ class VendorLibghosttyVtTests(unittest.TestCase):
             dist.mkdir(parents=True)
             (dist / "libghostty-vt-1.3.2-main-+deadbeef0.tar.gz").write_bytes(b"stale")
 
+            def git_output(command: list[str], **_kwargs: object) -> str:
+                if command[1] == "status":
+                    return ""
+                return "0123456789abcdef\n"
+
             with (
                 mock.patch("scripts.vendor_libghostty_vt.subprocess.run"),
                 mock.patch(
                     "scripts.vendor_libghostty_vt.subprocess.check_output",
-                    return_value="0123456789abcdef\n",
+                    side_effect=git_output,
                 ),
             ):
                 with self.assertRaisesRegex(FileNotFoundError, "HEAD 012345678"):
                     ensure_dist_archive(repo)
 
+    def test_require_clean_checkout_rejects_tracked_and_untracked_changes(self) -> None:
+        with tempfile.TemporaryDirectory() as temp_dir:
+            repo = Path(temp_dir)
+            with mock.patch(
+                "scripts.vendor_libghostty_vt.subprocess.check_output",
+                return_value=" M src/terminal.zig\n?? local.patch\n",
+            ):
+                with self.assertRaisesRegex(ValueError, "refusing to vendor from dirty checkout"):
+                    require_clean_checkout(repo)
+
+    def test_ensure_dist_archive_rejects_checkout_dirtied_by_build(self) -> None:
+        with tempfile.TemporaryDirectory() as temp_dir:
+            repo = Path(temp_dir)
+            with (
+                mock.patch("scripts.vendor_libghostty_vt.subprocess.run"),
+                mock.patch(
+                    "scripts.vendor_libghostty_vt.subprocess.check_output",
+                    side_effect=["", "0123456789abcdef\n", " M generated.txt\n"],
+                ),
+            ):
+                with self.assertRaisesRegex(ValueError, "refusing to vendor from dirty checkout"):
+                    ensure_dist_archive(repo)
+
     def test_vendored_tree_contains_required_upstream_files(self) -> None:
         root = Path(__file__).resolve().parent.parent / "vendor" / "libghostty-vt"
         required = [
diff --git a/scripts/vendor_libghostty_vt.py b/scripts/vendor_libghostty_vt.py
index b493de03..7bd234d4 100644
--- a/scripts/vendor_libghostty_vt.py
+++ b/scripts/vendor_libghostty_vt.py
@@ -12,7 +12,6 @@ from pathlib import Path
 
 @dataclass
 class VendorMetadata:
-    source_repo: str
     source_commit: str
     dist_archive: str
     extracted_dir: str
@@ -34,13 +33,25 @@ def git_head(repo: Path) -> str:
     return subprocess.check_output(["git", "rev-parse", "HEAD"], cwd=repo, text=True).strip()
 
 
+def require_clean_checkout(repo: Path) -> None:
+    status = subprocess.check_output(
+        ["git", "status", "--porcelain", "--untracked-files=all"],
+        cwd=repo,
+        text=True,
+    ).strip()
+    if status:
+        raise ValueError(f"refusing to vendor from dirty checkout {repo}:\n{status}")
+
+
 def ensure_dist_archive(source_repo: Path) -> Path:
+    require_clean_checkout(source_repo)
     head = git_head(source_repo)[:9]
     subprocess.run(
         ["zig", "build", "dist", "-Demit-lib-vt", "-Doptimize=ReleaseFast"],
         cwd=source_repo,
         check=True,
     )
+    require_clean_checkout(source_repo)
     dist_dir = source_repo / "zig-out" / "dist"
     archives = sorted(dist_dir.glob(f"libghostty-vt-*+{head}.tar.gz"))
     if not archives:
@@ -69,7 +80,6 @@ def vendor_libghostty_vt(source_repo: Path, destination: Path) -> VendorMetadata
         shutil.copytree(extracted, destination)
 
     return VendorMetadata(
-        source_repo=str(source_repo),
         source_commit=git_head(source_repo),
         dist_archive=archive.name,
         extracted_dir=root,