fix: ensure linter works when python_min is set via jinja2

conda_smithy/utils.py

@@ -1,6 +1,7 @@
 import datetime
 import json
 import os
+import re
 import shutil
 import tempfile
 import time
@@ -18,6 +19,7 @@
 
 RATTLER_BUILD = "rattler-build"
 CONDA_BUILD = "conda-build"
+SET_PYTHON_MIN_RE = re.compile(r"{%\s+set\s+python_min\s+=")
 
 
 def _get_metadata_from_feedstock_dir(
@@ -118,6 +120,15 @@ def stub_subpackage_pin(*args, **kwargs):
     return f"subpackage_pin {args[0]}"
 
 
+def _munge_python_min(text):
+    new_lines = []
+    for line in text.splitlines(keepends=True):
+        if SET_PYTHON_MIN_RE.match(line):
+            line = "{% set python_min = '9999' %}\n"
+        new_lines.append(line)
+    return "".join(new_lines)
+
+
 def render_meta_yaml(text):
     env = jinja2.sandbox.SandboxedEnvironment(undefined=NullUndefined)
 
@@ -146,7 +157,7 @@ def render_meta_yaml(text):
     mockos = MockOS()
     py_ver = "3.7"
     context = {"os": mockos, "environ": mockos.environ, "PY_VER": py_ver}
-    content = env.from_string(text).render(context)
+    content = env.from_string(_munge_python_min(text)).render(context)
     return content
 
 

news/2132-more-noarch-bugs.rst

@@ -0,0 +1,23 @@
+**Added:**
+
+* <news item>
+
+**Changed:**
+
+* <news item>
+
+**Deprecated:**
+
+* <news item>
+
+**Removed:**
+
+* <news item>
+
+**Fixed:**
+
+* Fixed bug when linting for ``noarch: python`` syntax and using jinja2 set statements. (#2132)
+
+**Security:**
+
+* <news item>

tests/test_lint_recipe.py

@@ -3176,6 +3176,30 @@ def test_hint_pip_no_build_backend(
             ),
             ["python >={{ python_min }}"],
         ),
+        (
+            textwrap.dedent(
+                """
+                {% set python_min = '3.7' %}
+
+                package:
+                  name: python
+
+                build:
+                  noarch: python
+
+                requirements:
+                  host:
+                    - python {{ python_min }}
+                  run:
+                    - python >={{ python_min }}
+
+                test:
+                  requires:
+                    - python {{ python_min }}
+                """
+            ),
+            [],
+        ),
     ],
 )
 def test_hint_noarch_python_use_python_min(