Doka

This tool adds new features to Dockerfiles. It does not reimplement parts of the Docker API nor it replaces Dockerfile functionalities, it’s just a preprocessor that generates a Dockerfile from various instructions.

Usage

When running the doka command, it will try to get the Dokafile file in the current working directory. If a Dokafile doesn’t exist, you can specify a custom path with --file/-f option or create one in the current working directory.

Variables

Variables can be specified using --var/-v option.

doka -v my_var1=value1 -v my_var2=value2

You can also let doka fetch the value of a variable from the environment by not manually giving a value.

doka -v MY_ENV_VAR

Variables are called using $my_var syntax in Dokafiles.

By default, os and arch variables are set depending on the current system.

!IF preprocessor

!IF preprocessor is used to conditionally include or not instructions. Right now you can use it to compare variables and values between them.

!IF $my_var == "value1"
    RUN echo "Hi there"
END

!IF $var1 != $var2
    RUN echo "var1 is not equal to var2"
END

You can nest !IF instructions if wanted.

Examples

Optionally installing curl

# Dokafile
FROM ubuntu:18.04

WORKDIR /home/ubuntu

!IF $enable_curl == "1"
    RUN apt-get update && apt-get install -y curl
!END

COPY main.py /usr
CMD ["python3", "main.py"]

GitHub

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