Support a SOURCE_DATE_EPOCH prior to 1980

Author: branchvincent

backend/src/hatchling/builders/wheel.py

@@ -88,7 +88,9 @@ def __init__(self, project_id: str, *, reproducible: bool) -> None:
     def get_reproducible_time_tuple() -> TIME_TUPLE:
         from datetime import datetime, timezone
 
-        d = datetime.fromtimestamp(get_reproducible_timestamp(), timezone.utc)
+        # `zipfile.ZipInfo` does not support timestamps before 1980
+        min_ts = 315532800  # 1980-01-01T00:00:00Z
+        d = datetime.fromtimestamp(max(get_reproducible_timestamp(), min_ts), timezone.utc)
         return d.year, d.month, d.day, d.hour, d.minute, d.second
 
     def add_file(self, included_file: IncludedFile) -> tuple[str, str, str]:

tests/backend/builders/test_wheel.py

@@ -786,7 +786,14 @@ def test_default_auto_detection(self, hatch, helpers, temp_dir, config_file):
             zip_info = zip_archive.getinfo(f"{metadata_directory}/WHEEL")
             assert zip_info.date_time == (2020, 2, 2, 0, 0, 0)
 
-    def test_default_reproducible_timestamp(self, hatch, helpers, temp_dir, config_file):
+    @pytest.mark.parametrize(
+        ("epoch", "expected_date_time"),
+        [
+            ("0", (1980, 1, 1, 0, 0, 0)),
+            ("1580601700", (2020, 2, 2, 0, 1, 40)),
+        ],
+    )
+    def test_default_reproducible_timestamp(self, hatch, helpers, temp_dir, config_file, epoch, expected_date_time):
         config_file.model.template.plugins["default"]["src-layout"] = False
         config_file.save()
 
@@ -812,7 +819,7 @@ def test_default_reproducible_timestamp(self, hatch, helpers, temp_dir, config_f
         build_path = project_path / "dist"
         build_path.mkdir()
 
-        with project_path.as_cwd(env_vars={"SOURCE_DATE_EPOCH": "1580601700"}):
+        with project_path.as_cwd(env_vars={"SOURCE_DATE_EPOCH": epoch}):
             artifacts = list(builder.build(directory=str(build_path)))
 
         assert len(artifacts) == 1
@@ -837,7 +844,7 @@ def test_default_reproducible_timestamp(self, hatch, helpers, temp_dir, config_f
 
         with zipfile.ZipFile(str(expected_artifact), "r") as zip_archive:
             zip_info = zip_archive.getinfo(f"{metadata_directory}/WHEEL")
-            assert zip_info.date_time == (2020, 2, 2, 0, 1, 40)
+            assert zip_info.date_time == expected_date_time
 
     def test_default_no_reproducible(self, hatch, helpers, temp_dir, config_file):
         config_file.model.template.plugins["default"]["src-layout"] = False