[jira] [Created] (AIRFLOW-694) Empty env vars do not overwrite non-empty config values

["Rolf Schroeder (JIRA)" <ji...@apache.org>]

Rolf Schroeder created AIRFLOW-694:
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             Summary: Empty env vars do not overwrite non-empty config values
                 Key: AIRFLOW-694
                 URL: https://issues.apache.org/jira/browse/AIRFLOW-694
             Project: Apache Airflow
          Issue Type: Bug
          Components: core
    Affects Versions: Airflow 1.7.1.3
            Reporter: Rolf Schroeder
            Priority: Minor


Setting an empty environment variable, ex:

export AIRFLOW__SMTP__SMTP_PASSWORD=""

will not overwrite any config variable which is not empty, ex

smtp_password = airflow

I know that I could simply modify the values in aiflow.cfg. However, my expectation (according to the docs) was that env vars always overwrite default values. This is clearly not the case.

[see airflow/configuration.py]
    def get(self, section, key, **kwargs):
        section = str(section).lower()
        key = str(key).lower()

        # first check environment variables
        option = self._get_env_var_option(section, key)
        if option: ## !!!!! empty string will evaluate to False !!!!!
            return option

        # ...then the config file
        if self.has_option(section, key):
            return expand_env_var(
                ConfigParser.get(self, section, key, **kwargs))


If the env var is empty, it will not get used.



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