fix: catch CondaBuildUserError w/ SystemExit (#5538)

* fix: catch user errors in `distribute_variants`

* fix: catch a few more SystemExits

* test: add test to ensure undefine jinja2 is OK

* doc: add news

conda_build/metadata.py

@@ -2579,7 +2579,7 @@ def get_output_metadata_set(
                     ref_metadata.parse_until_resolved(
                         allow_no_other_outputs=True, bypass_env_check=True
                     )
-                except SystemExit:
+                except (SystemExit, CondaBuildUserError):
                     pass
                 outputs = get_output_dicts_from_metadata(ref_metadata)
 
@@ -2611,7 +2611,7 @@ def get_output_metadata_set(
                         ref_metadata.other_outputs = out_metadata.other_outputs = (
                             all_output_metadata
                         )
-                except SystemExit:
+                except (SystemExit, CondaBuildUserError):
                     if not permit_undefined_jinja:
                         raise
                     output_tuples = []

conda_build/render.py

@@ -34,7 +34,7 @@
 
 from . import environ, exceptions, source, utils
 from .config import CondaPkgFormat
-from .exceptions import DependencyNeedsBuildingError
+from .exceptions import CondaBuildUserError, DependencyNeedsBuildingError
 from .index import get_build_index
 from .metadata import MetaData, MetaDataTuple, combine_top_level_metadata_with_output
 from .utils import (
@@ -894,7 +894,7 @@ def distribute_variants(
                 allow_no_other_outputs=allow_no_other_outputs,
                 bypass_env_check=bypass_env_check,
             )
-        except SystemExit:
+        except (SystemExit, CondaBuildUserError):
             pass
         need_source_download = not mv.needs_source_for_render or not mv.source_provided
 

news/5538-sysexit-vs-cdusererror

@@ -0,0 +1,20 @@
+### Enhancements
+
+* <news item>
+
+### Bug fixes
+
+* Fixed a bug where some ``CondaBuildUserError`` exceptions that were formally ``SystemExit`` exceptions
+  were not being caught properly. (#5538)
+
+### Deprecations
+
+* <news item>
+
+### Docs
+
+* <news item>
+
+### Other
+
+* <news item>

tests/test_api_render.py

@@ -7,6 +7,7 @@
 
 import os
 import re
+import textwrap
 from itertools import count, islice
 
 import pytest
@@ -15,6 +16,7 @@
 from conda.common.compat import on_win
 
 from conda_build import api, render
+from conda_build.exceptions import CondaBuildUserError
 from conda_build.variants import validate_spec
 
 from .utils import metadata_dir, variants_dir
@@ -341,3 +343,46 @@ def create_variants():
         recipe, config=testing_config, channels=[], variants=create_variants()
     )
     assert len(metadata_tuples) == 11 - 3  # omits libarrow-all, pyarrow, pyarrow-tests
+
+
+def test_api_render_missing_jinja2(testing_config, testing_workdir):
+    with open(os.path.join(testing_workdir, "meta.yaml"), "w") as f:
+        f.write(
+            textwrap.dedent(
+                """
+            package:
+              name: blah-{{ foo }}
+              version: 0.1
+
+            build:
+              number: 0
+
+            requirements:
+              host:
+                - python {{ python_min }}
+              run:
+                - python
+            """
+            )
+        )
+
+    meta = api.render(
+        testing_workdir,
+        finalize=False,
+        bypass_env_check=True,
+        trim_skip=False,
+    )
+    assert meta is not None
+    assert any("python" in val for val in meta[0][0].get_value("requirements/host"))
+    assert not any(
+        "{{ python_min }}" in val for val in meta[0][0].get_value("requirements/run")
+    )
+    assert meta[0][0].get_value("package/name") == "blah-"
+
+    with pytest.raises(CondaBuildUserError):
+        api.render(
+            testing_workdir,
+            finalize=True,
+            bypass_env_check=True,
+            trim_skip=False,
+        )