Ability to parse environment variable in config.yaml

[deviarchscs]

Problem

I have a scenario where I have to use the same script multiple times with different parameters. (ie: I have to count emails number in several mailboxes). The script_exporter is able to do that well but it is insecure and cumbersome to do this since I have to hardcode passwords directly in the config file. Ssee example below:

    scripts:
      - name: myemail_1
        command: java
        args:
          - -jar
          - /usr/src/CountMail.jar
        env:
          EMAIL: myemail_1@domain.com
          EMAIL_USERNAME: my_username_1
          EMAIL_PASSWORD: my_password_1
      - name: myemail_2
        command: java
        args:
          - -jar
          - /usr/src/CountMail.jar
        env:
          EMAIL: myemail_2@domain.com
          EMAIL_USERNAME: my_username_2
          EMAIL_PASSWORD: my_password_2
      - name: myemail_3
        command: java
        args:
          - -jar
          - /usr/src/CountMail.jar
        env:
          EMAIL: myemail_3@domain.com
          EMAIL_USERNAME: my_username_3
          EMAIL_PASSWORD: my_password_3

Solution

The script exporter should be able to parse environment variables written in the "args" and "env" section of a script inside the config.yaml file. This way, no sensitive information would be written onto the config file (and it will also improve readability IMO)

Example:

Prerequisites existing environment variables:

MYEMAIL_1 MYEMAIL_USERNAME_1 MYEMAIL_PASSWORD_1 MYEMAIL_2 MYEMAIL_USERNAME_2 MYEMAIL_PASSWORD_2 MYEMAIL_3 MYEMAIL_USERNAME_3 MYEMAIL_PASSWORD_3

    scripts:
      - name: myemail_1
        command: java
        args:
          - -jar
          - CountMail.jar
        env:
          EMAIL: ${MYEMAIL_1} 
          EMAIL_USERNAME: ${MYEMAIL_USERNAME_1}
          EMAIL_PASSWORD: ${MYEMAIL_PASSWORD_1}
      - name: myemail_2
        command: java
        args:
          - -jar
          - /usr/src/CountMail.jar
        env:
          EMAIL: ${MYEMAIL_2}
          EMAIL_USERNAME: ${MYEMAIL_USERNAME_2}
          EMAIL_PASSWORD: ${MYEMAIL_PASSWORD_2}
      - name: myemail_3
        command: java
        args:
          - -jar
          - /usr/src/CountMail.jar
        env:
          EMAIL: ${MYEMAIL_3}
          EMAIL_USERNAME: ${MYEMAIL_USERNAME_3}
          EMAIL_PASSWORD: ${MYEMAIL_PASSWORD_3}

[deviarchscs]

@ricoberger any thoughts? Thank you!

[ricoberger]

Hi @deviarchscs, I like the idea and this should be supported once #110 is merged.

Once it is merged, I will publish a new version. Please let me know if sth. isn't working as expected.