Merge pull request #373 from minrk/rm-history

remove conda-meta/history

repo2docker/buildpacks/conda/install-miniconda.bash

@@ -57,8 +57,12 @@ if [[ -f /tmp/kernel-environment.yml ]]; then
 
     conda env create -n kernel -f /tmp/kernel-environment.yml
     ${CONDA_DIR}/envs/kernel/bin/ipython kernel install --prefix "${CONDA_DIR}"
+    rm -f ${CONDA_DIR}/envs/kernel/conda-meta/history
 fi
-
+# remove conda history file,
+# which seems to result in some effective pinning of packages in the initial env,
+# which we don't intend
+rm -f ${CONDA_DIR}/conda-meta/history
 # Clean things out!
 conda clean -tipsy
 

tests/external/reproductions.repos.yaml

@@ -24,3 +24,9 @@
   url: https://github.com/binder-examples/requirements
   ref: test
   verify: python -c 'import matplotlib'
+# Test that custom channels and downgrades don't
+# get blocked by pinning
+- name: Xeus-Cling
+  url: https://github.com/QuantStack/xeus-cling
+  ref: 0.4.5
+  verify: jupyter kernelspec list