I want to execute a python script to set some environment variables in GitHub actions. I want to use those environment variables later in my GitHub actions steps. My python script looks like:
new_ver = get_version_from_commit(commit_msg)
if new_ver:
if new_ver == "false":
os.environ["SHOULD_PUSH"] = "0"
print("Not pushing the image to k8s")
exit(0)
else:
new_tag = app_name + ":" + str(new_ver)
os.environ["DOCKER_IMAGE_TAG"] = new_tag
os.environ["SHOULD_PUSH"] = "1"
print("New tag: " + new_tag)
exit(0)
Part of my GitHub actions file, after the execution of the above python script looks like:
- name: Print env var
run: echo ${{ env.DOCKER_IMAGE_TAG }}
- name: Build and push
id: docker_build
uses: docker/build-push-action@v2
with:
push: true
tags: ${{ secrets.DOCKER_REGISTRY }}/${{ env.DOCKER_IMAGE_TAG }}
But using os.environ won't expose the environment variable outside of the python process. How can I fix this ?
You cannot set environment variables directly. Instead, you need to write your environment variables into a file, whose name you can get via $GITHUB_ENV.
In a simple workflow step, you can append it to the file like so (from the docs):
echo "{name}={value}" >> $GITHUB_ENV
In python, you can do it like so:
import os
env_file = os.getenv('GITHUB_ENV')
with open(env_file, "a") as myfile:
myfile.write("MY_VAR=MY_VALUE")
Given this python script, you can set and use your new environment variable like the following:
- run: python write-env.py
- run: echo ${{ env.MY_VAR }}
I asked me how to set two or more environment variables. You have te seperate these variables with a linebreak. Here is an example:
import os
env_file = os.getenv('GITHUB_ENV')
with open(env_file, "a") as myfile:
myfile.write("MY_VAR1=MY_VALUE1\n")
myfile.write("MY_VAR2=MY_VALUE2")