apacheGH-41964: [CI][C++] Clear cache for mamba on AppVeyor (apache#4…

…1977) ### Rationale for this change It seems that mamba may use invalid download URL when there are invalid caches. ### What changes are included in this PR? Clear caches explicitly. ### Are these changes tested? Yes. ### Are there any user-facing changes? No. * GitHub Issue: apache#41964 Authored-by: Sutou Kouhei <[email protected]> Signed-off-by: Antoine Pitrou <[email protected]>
pitrou · Jun 6, 2024 · 67c6df1 · 67c6df1
1 parent cea7323
commit 67c6df1
Showing 1 changed file with 3 additions and 0 deletions.
diff --git a/ci/appveyor-cpp-setup.bat b/ci/appveyor-cpp-setup.bat
@@ -66,6 +66,9 @@ set CONDA_PACKAGES=%CONDA_PACKAGES% --file=ci\conda_env_cpp.txt
 @rem Force conda to use conda-forge
 conda config --add channels conda-forge
 conda config --remove channels defaults
+@rem Ensure using the latest information. If there are invalid caches,
+@rem mamba may use invalid download URL.
+mamba clean --all -y
 @rem Arrow conda environment
 mamba create -n arrow -y -c conda-forge ^
   --file=ci\conda_env_python.txt ^