Verify SHA1 checksum

tools/configure.py

@@ -179,6 +179,12 @@ def main():
         )
         n.newline()
 
+        n.rule(
+            name="sha1",
+            command=f"{PYTHON} tools/sha1.py $in -c $sha1_file"
+        )
+        n.newline()
+
         game_build = build_path / game_version
         game_extract = extract_path / game_version
 
@@ -249,6 +255,16 @@ def add_mwld_and_rom_builds(n: ninja_syntax.Writer, game_build: Path, game_confi
     )
     n.newline()
 
+    n.build(
+        inputs=rom_file,
+        rule="sha1",
+        variables={
+            "sha1_file": str(Path(rom_file).with_suffix(".sha1"))
+        },
+        outputs="sha1",
+    )
+    n.newline()
+
 
 def add_mwcc_builds(n: ninja_syntax.Writer, game_version: str, game_build: Path, mwcc_implicit: list[Path]):
     for source_file in get_c_cpp_files([src_path, libs_path]):

tools/sha1.py

@@ -0,0 +1,29 @@
+#!/usr/bin/env python
+
+from pathlib import Path
+import argparse
+import hashlib
+import sys
+
+def eprint(*args, **kwargs):
+    print(*args, file=sys.stderr, **kwargs)
+
+parser = argparse.ArgumentParser(description="Computes and verifies a SHA1 checksum")
+parser.add_argument('file', help="Input file to verify")
+parser.add_argument('-c', type=str, dest='checksum_file', required=False, help='Checksum file')
+args = parser.parse_args()
+
+file_path = Path(args.file)
+checksum_path = Path(args.checksum_file)
+
+with checksum_path.open('r') as file:
+    target_sha1, _ = file.readline().split(' ', 1)
+
+with file_path.open('rb') as file:
+    file_sha1 = hashlib.sha1(file.read()).hexdigest()
+
+if target_sha1 != file_sha1:
+    eprint(f"{file_path}: FAILED")
+    exit(1)
+else:
+    eprint(f"{file_path}: OK")