use index in offline mode when called from conda-build

conda_libmamba_solver/index.py

@@ -409,3 +409,10 @@ def _process_query_result(
 
 # for conda-build
 _CachedLibMambaIndexHelper = lru_cache(maxsize=None)(LibMambaIndexHelper)
+
+
+# conda-build needs to operate offline for the index
+def _LibMambaIndexHelperOffline(*args, **kwargs):
+    with context._override("offline", True):
+        helper = _CachedLibMambaIndexHelper(*args, **kwargs)
+        return helper

conda_libmamba_solver/solver.py

@@ -49,7 +49,7 @@
 
 from . import __version__
 from .exceptions import LibMambaUnsatisfiableError
-from .index import LibMambaIndexHelper, _CachedLibMambaIndexHelper
+from .index import LibMambaIndexHelper, _LibMambaIndexHelperOffline
 from .mamba_utils import init_api_context, mamba_version
 from .state import SolverInputState, SolverOutputState
 from .utils import is_channel_available
@@ -175,7 +175,7 @@ def solve_final_state(
                 rec.channel: None for rec in self._index if rec.channel.scheme == "file"
             }
             # Cache indices for conda-build, it gets heavy otherwise
-            IndexHelper = _CachedLibMambaIndexHelper
+            IndexHelper = _LibMambaIndexHelperOffline
         else:
             IndexHelper = LibMambaIndexHelper
             conda_bld_channels = ()

tests/data/conda_build_recipes/stackvana/meta.yaml

@@ -1,4 +1,4 @@
-{% set name = "stackvana-core" %}
+{% set name = "stackvana-split" %}
 {% set version = "0.2021.43" %}
 {% set eups_product = "lsst_distrib" %}