Create a Conda environment.lock.yml for macOS while running on Linux

condalock.sh

#!/bin/bash

# This script creates both
# - environment.osx.lock.yml and
# - environment.linux.lock.yml
# regardless of the operating system it is running on. The trick is
# temporarily setting the subdir and subdirs keys in .condarc to
# what would be appropriate for the other operating system.
#
# It assumes that there exists a (manually managed) environment.yml file
# that contains the abstract dependencies.
# When creating the test environment, the .lock.yml files are used in order
# to ensure reproducibility.

set -euo pipefail

# We need to temporarily move away the user's .condarc if it exists.
if [[ -e ~/.condarc ]]; then
    mv ~/.condarc ~/.condarc.condalock.bak
    trap "mv ~/.condarc.condalock.bak ~/.condarc" EXIT
else
    trap "rm ~/.condarc" EXIT
fi

for os in linux osx; do
    env=temporary-environment-$os
    env_yml=environment.$os.lock.yml
    printf "subdir: %s-64\nsubdirs:\n  - %s-64\n  - noarch\n" $os $os >> ~/.condarc
    conda env create -n $env -f environment.yml
    conda env export -n $env | grep -Ev '^(name|prefix):' > ${env_yml}
    conda env remove -n $env
    echo "Created ${env_yml}"
done

# The original .condarc will be restored by the exit trap

This script is outdated, use https://github.com/conda-incubator/conda-lock instead