Validate LF line endings in release builds

Replaces the removed normalize_line_endings rewriter: release.py now
fails listing any text file containing CRLF instead of silently
rewriting it. .gitattributes (eol=lf) remains the preventive half.

.gitattributes

@@ -0,0 +1 @@
+* text=auto eol=lf

.gitignore

@@ -8,5 +8,6 @@
 /src/aeg/_aegis*.pyd
 __pycache__
 !.gitignore
+!.gitattributes
 !.gitea/
 !.gitmodules

setup.py

@@ -14,8 +14,10 @@ if sys.maxsize <= 2**32:
         "aeg does not support 32-bit platforms; build with a 64-bit Python"
     )
 
-libaegis_static = ROOT / "libaegis/zig-out/lib" / (
+libaegis_static = (
-    "aegis.lib" if sys.platform == "win32" else "libaegis.a"
+    ROOT
+    / "libaegis/zig-out/lib"
+    / ("aegis.lib" if sys.platform == "win32" else "libaegis.a")
 )
 
 ffibuilder = FFI()

tools/generate.py

@@ -73,6 +73,42 @@ def format_declaration(decl: str, max_width: int = 100) -> str:
     return decl
 
 
+def _ruff_format_source(content: str, filename: str) -> str:
+    """Format Python source in memory (ruff format via stdin, no file writes)."""
+    result = subprocess.run(
+        ["uv", "run", "ruff", "format", "--stdin-filename", filename, "-"],
+        input=content,
+        capture_output=True,
+        text=True,
+        check=True,
+    )
+    return result.stdout
+
+
+def _is_up_to_date(path: pathlib.Path, content: str, check: bool) -> bool:
+    """True if writing content to path would leave it unchanged. In check mode,
+    Python content is compared in its ruff-formatted form, matching what a
+    write + format pass would produce."""
+    if not path.exists():
+        return False
+    if check and path.suffix == ".py":
+        content = _ruff_format_source(content, path.name)
+    return path.read_text(encoding="utf-8") == content
+
+
+def _sync_file(
+    path: pathlib.Path, content: str, check: bool, stale: list[pathlib.Path]
+) -> None:
+    """Write content to path, or in check mode record it as stale instead."""
+    if _is_up_to_date(path, content, check):
+        print(f"  - No changes to {path.name}", file=sys.stderr)
+    elif check:
+        stale.append(path)
+    else:
+        path.write_bytes(content.encode())
+        print(f"  - Updated {path}", file=sys.stderr)
+
+
 def generate_cdef(include_dir: pathlib.Path) -> str:
     # cffi pre-defines uint8_t, size_t, etc. with the correct platform sizes.
     # Do not typedef them here: "unsigned long" matches size_t on LP64 but is
@@ -240,6 +276,7 @@ def generate_python_modules(
     template_path: pathlib.Path,
     output_dir: pathlib.Path,
     constants: dict[str, dict[str, int]],
+    check: bool = False,
 ) -> tuple[list[pathlib.Path], list[pathlib.Path]]:
     if not template_path.exists():
         raise FileNotFoundError(f"Template not found: {template_path}")
@@ -287,10 +324,11 @@ def generate_python_modules(
         else:
             new_content = generate_variant(template_src, variant, const_dict)
 
-        if dst.exists() and dst.read_text(encoding="utf-8") == new_content:
+        if _is_up_to_date(dst, new_content, check):
             unchanged.append(dst)
         else:
-            dst.write_bytes(new_content.encode())
+            if not check:
+                dst.write_bytes(new_content.encode())
             updated.append(dst)
 
     return updated, unchanged
@@ -313,7 +351,9 @@ def generate_ciphers_module(constants: dict[str, dict[str, int]]) -> str:
     return "\n".join(lines) + "\n"
 
 
-def main() -> int:
+def main(check: bool = False) -> int:
+    """Regenerate files from the C sources. With check=True, only verify the
+    committed files are up to date; nothing is written."""
     root = pathlib.Path(__file__).parent.parent
     libaegis_src_dir = root / "libaegis" / "src"
     include_dir = libaegis_src_dir / "include"
@@ -333,36 +373,26 @@ def main() -> int:
         print("Error: No constants extracted", file=sys.stderr)
         return 1
 
-    print("Step 2: Generating CFFI cdef header...", file=sys.stderr)
+    stale: list[pathlib.Path] = []
-    pyaegis_dir.mkdir(exist_ok=True)
-    cdef_path = pyaegis_dir / "aegis_cdef.h"
-    cdef_content = generate_cdef(include_dir)
 
-    if cdef_path.exists() and cdef_path.read_text(encoding="utf-8") == cdef_content:
+    print("Step 2: Generating CFFI cdef header...", file=sys.stderr)
-        print(f"  - No changes to {cdef_path}", file=sys.stderr)
+    if not check:
-    else:
+        pyaegis_dir.mkdir(exist_ok=True)
-        cdef_path.write_bytes(cdef_content.encode())
+    _sync_file(pyaegis_dir / "aegis_cdef.h", generate_cdef(include_dir), check, stale)
-        print(f"  - Updated {cdef_path}", file=sys.stderr)
 
     print("Step 3: Generating _ciphers.py...", file=sys.stderr)
-    ciphers_path = pyaegis_dir / "_ciphers.py"
+    _sync_file(
-    ciphers_content = generate_ciphers_module(constants)
+        pyaegis_dir / "_ciphers.py", generate_ciphers_module(constants), check, stale
-
+    )
-    if (
-        ciphers_path.exists()
-        and ciphers_path.read_text(encoding="utf-8") == ciphers_content
-    ):
-        print(f"  - No changes to {ciphers_path.name}", file=sys.stderr)
-    else:
-        ciphers_path.write_bytes(ciphers_content.encode())
-        print(f"  - Updated {ciphers_path.name}", file=sys.stderr)
 
     print("Step 4: Generating Python modules...", file=sys.stderr)
     try:
         updated, unchanged = generate_python_modules(
-            pyaegis_dir / "aegis256x4.py", pyaegis_dir, constants
+            pyaegis_dir / "aegis256x4.py", pyaegis_dir, constants, check=check
         )
-        if updated:
+        if check:
+            stale.extend(updated)
+        else:
             for p in updated:
                 print(f"  - {p.relative_to(root)}", file=sys.stderr)
         if unchanged:
@@ -377,6 +407,19 @@ def main() -> int:
         print(f"Error generating Python modules: {e}", file=sys.stderr)
         return 1
 
+    if check:
+        for p in stale:
+            print(f"  - Out of date: {p.relative_to(root)}", file=sys.stderr)
+        if stale:
+            print(
+                "✗ Generated files are out of date; "
+                "run tools/generate.py and commit the result",
+                file=sys.stderr,
+            )
+            return 1
+        print("All generated files are up to date.", file=sys.stderr)
+        return 0
+
     print("Step 5: Formatting generated files with ruff...", file=sys.stderr)
     result = subprocess.run(
         ["uv", "run", "ruff", "format", str(pyaegis_dir)],
@@ -392,4 +435,4 @@ def main() -> int:
 
 
 if __name__ == "__main__":
-    raise SystemExit(main())
+    raise SystemExit(main(check="--check" in sys.argv))

tools/release.py

@@ -129,27 +129,29 @@ def get_build_env():
     return env
 
 
-def normalize_line_endings(repo_root: Path):
+# Text files that must have LF line endings (.gitattributes enforces this on
-    """Normalize all text files to LF line endings."""
+# checkout; release validation fails instead of rewriting)
-    # Patterns for files to normalize
+LINE_ENDING_PATTERNS = [
-    patterns = [
+    "src/aeg/**/*.py",
-        "src/aeg/**/*.py",
+    "src/aeg/**/*.h",
-        "src/aeg/**/*.h",
+    "tests/**/*.py",
-        "tests/**/*.py",
+    "tools/**/*.py",
-        "tools/**/*.py",
+    "*.py",
-        "*.py",
+    "*.md",
-        "*.md",
+    "*.txt",
-        "*.txt",
+    "*.toml",
-        "*.toml",
+    "*.in",
-        "*.in",
+]
-    ]
+
-    for pattern in patterns:
+
+def find_crlf_files(repo_root: Path) -> list[Path]:
+    """Return text files containing CRLF line endings."""
+    bad = []
+    for pattern in LINE_ENDING_PATTERNS:
         for file_path in repo_root.glob(pattern):
-            if file_path.is_file():
+            if file_path.is_file() and b"\r\n" in file_path.read_bytes():
-                content = file_path.read_bytes()
+                bad.append(file_path)
-                if b"\r\n" in content:
+    return bad
-                    content = content.replace(b"\r\n", b"\n")
-                    file_path.write_bytes(content)
 
 
 def get_wheel_pattern(py_version: str, abi3: bool = False) -> str:
@@ -317,29 +319,38 @@ def main():
     repo_root = Path(__file__).parent.parent
     dist_dir = repo_root / "dist"
 
-    # Generate CFFI definitions and Python modules
+    # The repository must already contain up-to-date generated code and
+    # lint-clean sources: a release build never writes to tracked files.
+    # Line endings must be LF (.gitattributes enforces this on checkout).
     print(f"\n{'=' * 70}")
-    print("Code generation from C headers (tools/generate.py)")
+    print("Validating generated files (tools/generate.py --check)")
     print(f"{'=' * 70}")
-    if generate.main() != 0:
+    if generate.main(check=True) != 0:
-        print("✗ Code generation failed", file=sys.stderr)
         return 1
 
-    # Run ruff to check and fix any issues
     print(f"\n{'=' * 70}")
-    print("Linting and formatting")
+    print("Lint and format validation")
     print(f"{'=' * 70}")
-    if not run_command(["uv", "run", "ruff", "check", "--fix", "."]):
+    if not run_command(["uv", "run", "ruff", "check", "."]):
-        print("✗ Ruff check failed", file=sys.stderr)
+        print("✗ Ruff check failed; fix and commit before releasing", file=sys.stderr)
         return 1
 
-    # Run ruff format
+    if not run_command(["uv", "run", "ruff", "format", "--check", "."]):
-    if not run_command(["uv", "run", "ruff", "format", "."]):
+        print(
-        print("✗ Ruff format failed", file=sys.stderr)
+            "✗ Ruff format check failed; run 'uv run ruff format .' and commit",
+            file=sys.stderr,
+        )
         return 1
 
-    # Normalize all line endings to LF (important for consistent builds)
+    if crlf_files := find_crlf_files(repo_root):
-    normalize_line_endings(repo_root)
+        print("✗ CRLF line endings found in:", file=sys.stderr)
+        for p in crlf_files:
+            print(f"  - {p.relative_to(repo_root)}", file=sys.stderr)
+        print(
+            "Convert to LF and commit (.gitattributes enforces eol=lf).",
+            file=sys.stderr,
+        )
+        return 1
 
     # Get version from git repo
     version = get_version_from_scm()
@@ -347,6 +358,33 @@ def main():
         return 1
     is_release = is_release_version(version)
 
+    # On a tagged commit the version must be a clean release (e.g. 0.10.6).
+    # A dev/dirty version means the checkout itself is dirty (PyPI rejects
+    # such versions), so fail before building.
+    head_tags = subprocess.run(
+        ["git", "tag", "--points-at", "HEAD", "--list", "v*"],
+        capture_output=True,
+        text=True,
+        check=False,
+    ).stdout.split()
+    if head_tags and not is_release:
+        print(
+            f"✗ HEAD is tagged ({', '.join(head_tags)}) but the version resolved "
+            f"to {version}, not a clean release.",
+            file=sys.stderr,
+        )
+        dirty = subprocess.run(
+            ["git", "status", "--porcelain"],
+            capture_output=True,
+            text=True,
+            check=False,
+        ).stdout
+        if dirty.strip():
+            print("Working copy is dirty:", file=sys.stderr)
+            print(dirty, file=sys.stderr, end="")
+        print("Commit the changes, re-tag, and run again.", file=sys.stderr)
+        return 1
+
     # Main header for the packaging process
     print(f"\n{'=' * 70}")
     print(