override exclude-newer-package for groundhog only

src/groundhog_hpc/templates/shell_command.sh.jinja

@@ -37,10 +37,12 @@ mkdir -p "$UV_CACHE_DIR" "$UV_PYTHON_INSTALL_DIR"
 {% if log_level %}
 # Local override - use value from dispatching environment
 export GROUNDHOG_LOG_LEVEL="{{ log_level }}"
+export RUST_LOG=uv="${{GROUNDHOG_LOG_LEVEL}}"
 {% else %}
 {% raw %}
 # Respect remote environment if set, otherwise default to WARNING
 export GROUNDHOG_LOG_LEVEL="${{GROUNDHOG_LOG_LEVEL:-WARNING}}"
+export RUST_LOG=uv="${{GROUNDHOG_LOG_LEVEL:-WARNING}}"
 {% endraw %}
 {% endif %}
 
@@ -57,6 +59,7 @@ cat > {{ script_name }}.in << 'PAYLOAD_EOF'
 PAYLOAD_EOF
 
 "$UV_BIN" run --with {{ version_spec }} \
+  --exclude-newer-package groundhog-hpc={{ groundhog_timestamp }} \
   {{ runner_name }}.py
 
 echo "__GROUNDHOG_RESULT__"

src/groundhog_hpc/templating.py

@@ -10,6 +10,7 @@
 import logging
 import os
 import uuid
+from datetime import datetime, timezone
 from hashlib import sha1
 from pathlib import Path
 
@@ -74,6 +75,10 @@ def template_shell_command(script_path: str, function_name: str, payload: str) -
     version_spec = get_groundhog_version_spec()
     logger.debug(f"Using groundhog version spec: {version_spec}")
 
+    # Generate timestamp for groundhog-hpc exclude-newer override
+    # This allows groundhog to bypass user's exclude-newer restrictions
+    groundhog_timestamp = datetime.now(timezone.utc).strftime("%Y-%m-%dT%H:%M:%SZ")
+
     # Load runner template
     templates_dir = Path(__file__).parent / "templates"
     jinja_env = Environment(loader=FileSystemLoader(templates_dir))
@@ -106,6 +111,7 @@ def template_shell_command(script_path: str, function_name: str, payload: str) -
         version_spec=version_spec,
         payload=payload,
         log_level=local_log_level,
+        groundhog_timestamp=groundhog_timestamp,
     )
 
     logger.debug(f"Generated shell command ({len(shell_command_string)} chars)")

tests/test_templating.py

@@ -342,6 +342,41 @@ def func2():
         # They should have different hashes since content differs
         assert command1 != command2
 
+    def test_includes_exclude_newer_package_flag(self, tmp_path):
+        """Test that shell command always includes --exclude-newer-package for groundhog-hpc.
+
+        This prevents user's exclude-newer settings from blocking groundhog installation.
+        """
+        script_path = tmp_path / "script.py"
+        script_content = """# /// script
+# requires-python = ">=3.12"
+# dependencies = []
+#
+# [tool.uv]
+# exclude-newer = "2020-01-01T00:00:00Z"
+# ///
+
+import groundhog_hpc as hog
+
+@hog.function()
+def func():
+    return 1
+"""
+        script_path.write_text(script_content)
+
+        shell_command = template_shell_command(str(script_path), "func", "test_payload")
+
+        # Should include the package-specific exclude-newer override
+        assert "--exclude-newer-package groundhog-hpc=" in shell_command
+        # Timestamp should be in ISO format (basic validation)
+        import re
+
+        match = re.search(
+            r"--exclude-newer-package groundhog-hpc=(\d{4}-\d{2}-\d{2}T\d{2}:\d{2}:\d{2}Z)",
+            shell_command,
+        )
+        assert match, "exclude-newer-package timestamp should be in ISO 8601 format"
+
 
 class TestDottedQualnames:
     """Test that templating handles dotted qualnames (class methods)."""