Download Conda package tarballs needed to create an environment

conda-download.sh

#!/bin/bash -l                                                                                                                                  
# use tmp dir to avoid name conflicts
tmp=$(mktemp -d)

# solve environment, ignoring existing cache
CONDA_PKGS_DIRS=$tmp conda create -dp $tmp/0 --json "$@" |\
    # filter to tarball URLs
    grep '"url"' | grep -oE 'https[^"]+' |\
    # download locally
    xargs wget -c

# clean up
rm -r $tmp