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from __future__ import annotations
import unittest
from scripts.nix_cargo_hash import (
NixCargoHashError,
check_cargo_hash,
find_cargo_hash_assignment,
parse_got_hash,
replace_cargo_hash_assignment,
)
PACKAGE_TEXT = """
rustPlatform.buildRustPackage {
pname = "herdr";
cargoHash = "sha256-oldHash=";
}
"""
class NixCargoHashTests(unittest.TestCase):
def test_find_cargo_hash_assignment_reads_single_hash(self) -> None:
self.assertEqual(find_cargo_hash_assignment(PACKAGE_TEXT), '"sha256-oldHash="')
def test_replace_cargo_hash_assignment_updates_single_hash(self) -> None:
updated = replace_cargo_hash_assignment(PACKAGE_TEXT, '"sha256-newHash="')
self.assertIn('cargoHash = "sha256-newHash=";', updated)
self.assertNotIn("sha256-oldHash", updated)
def test_replace_cargo_hash_assignment_accepts_fake_hash(self) -> None:
updated = replace_cargo_hash_assignment(PACKAGE_TEXT, "lib.fakeHash")
self.assertIn("cargoHash = lib.fakeHash;", updated)
def test_replace_cargo_hash_assignment_rejects_missing_hash(self) -> None:
with self.assertRaisesRegex(NixCargoHashError, "found 0"):
replace_cargo_hash_assignment('pname = "herdr";\n', "lib.fakeHash")
def test_replace_cargo_hash_assignment_rejects_multiple_hashes(self) -> None:
text = PACKAGE_TEXT + PACKAGE_TEXT
with self.assertRaisesRegex(NixCargoHashError, "found 2"):
replace_cargo_hash_assignment(text, "lib.fakeHash")
def test_parse_got_hash_reads_nix_hash_mismatch(self) -> None:
output = """
specified: sha256-oldHash=
got: sha256-newHash123+/=
"""
self.assertEqual(parse_got_hash(output), "sha256-newHash123+/=")
def test_parse_got_hash_rejects_missing_hash(self) -> None:
with self.assertRaisesRegex(NixCargoHashError, "found 0"):
parse_got_hash("error: no hash here")
def test_parse_got_hash_rejects_multiple_hashes(self) -> None:
output = "got: sha256-one=\ngot: sha256-two=\n"
with self.assertRaisesRegex(NixCargoHashError, "found 2"):
parse_got_hash(output)
def test_check_cargo_hash_restores_file_on_failure(self) -> None:
import contextlib
import io
import tempfile
from pathlib import Path
from unittest import mock
with tempfile.TemporaryDirectory() as temp_dir:
package = Path(temp_dir) / "package.nix"
package.write_text(PACKAGE_TEXT, encoding="utf-8")
with mock.patch("scripts.nix_cargo_hash.shutil.which", return_value="/nix/bin/nix"):
with mock.patch("scripts.nix_cargo_hash.run_capture") as run_capture:
run_capture.side_effect = [
mock.Mock(returncode=0, stdout="x86_64-linux"),
mock.Mock(returncode=1, stdout="error without got hash"),
]
with contextlib.redirect_stdout(io.StringIO()):
with self.assertRaisesRegex(NixCargoHashError, "found 0"):
check_cargo_hash(package)
self.assertIn("--no-link", run_capture.call_args_list[1].args[0])
self.assertEqual(package.read_text(encoding="utf-8"), PACKAGE_TEXT)
if __name__ == "__main__":
unittest.main()
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