Viper does not properly read environment variables

[gadgethm]

I've been having trouble getting environment variables to work for passing the api token to ddns. I've tried both within an arm64 docker container (built using the repo's dockerfile + arm64 release binary, v4.0.3) and also with direct execution of the ddns binary on my arm64 machine. In both cases, the environment variable "DDNS_TOKEN" is not recognized, and ddns simply reports that a token is required. I also tried with different environment variables as specified in the README, but none of those seem to work either.

Perhaps this is related to this stack overflow issue? https://stackoverflow.com/questions/67608629/viper-automatic-environment-does-not-read-from-environment

[skibish]

Hi @gadgethm ,

thanks for reporting this! will try to take a look into this at the end of this week

[skibish]

May I ask you to share an example of how do you set the environment variables?

[gadgethm]

@skibish, sure thing! I use ansible for my deployment, here's the ansible docker-container invocation I'm using:

- name: Start/update ddns container
  community.docker.docker_container:
    name: ddns
    image: skibish/ddns:latest
    env:
      DDNS_TOKEN: "{{ digital_ocean_api_token }}"
    volumes:
      - "/srv/docker/ddns/ddns.yml:/ddns.yml"
    restart_policy: unless-stopped

And here's the contents of /srv/docker/ddns/ddns.yml:

# DDNS configuration file.

checkPeriod: "5m"
requestTimeout: "10s"
ipv6: true

# List of domains and their records to update.
domains:
  "hollandmoritz.net":
  - type: "A"
    name: "@"
  - type: "A"
    name: "*"
  - type: "AAAA"
    name: "@"
  - type: "AAAA"
    name: "*"

The log messages from the ddns container are the following:

time="2022-05-31T23:33:29Z" level=debug msg="using the following configuration file: /ddns.yml"
time="2022-05-31T23:33:29Z" level=fatal msg="token can't be empty"

I was also able to confirm using docker inspect that the container has the environment variable 'DDNS_TOKEN` set to my digital ocean api key.