Dockerfile

The Dockerfile defines the environment for the application. Below is a detailed explanation of the Dockerfile used for setting up the development environment.

# syntax=docker/dockerfile:1

ARG PYTHON_VERSION=3.12
FROM python:${PYTHON_VERSION}

WORKDIR /src
COPY . .

ARG VERSION=0.0.0.dev0
RUN --mount=type=cache,target=/cache/pip \
    PIP_CACHE_DIR=/cache/pip \
    SETUPTOOLS_SCM_PRETEND_VERSION=${VERSION} \
    pip install .[ssh]

Breakdown of the Dockerfile

• ARG PYTHON_VERSION=3.12: Sets a build-time variable for the Python version, which can be overridden.

• FROM python:${PYTHON_VERSION}: Specifies the base image using the provided Python version.

• WORKDIR /src: Sets the working directory inside the container to /src.

• COPY . .: Copies the content of the current directory into the working directory of the container.

• ARG VERSION=0.0.0.dev0: Also sets another build-time variable for the version of the application.

• RUN –mount=type=cache,target=/cache/pip: Uses a cache mount for the pip cache directory, improving performance by reusing previously downloaded packages.

• PIP_CACHE_DIR=/cache/pip: Sets an environment variable for pip to use the cached directory.

• SETUPTOOLS_SCM_PRETEND_VERSION=${VERSION}: Uses the provided version for setuptools, which helps in versioning during development.

• pip install .[ssh]: Installs the application along with the SSH extra dependencies.

Makefile

The Makefile orchestrates various tasks in the development environment. Below is a detailed breakdown of its functions.

Available functions in Makefile: test, SETUPTOOLS_SCM_PRETEND_VERSION_DOCKER ?= $(shell git describe --match '[0-9]*' --dirty='.m' --always --tags 2>/dev/null | sed -r 's/-([0-9]+)/.dev\1/' | sed 's/-/+/')

ifeq ($(SETUPTOOLS_SCM_PRETEND_VERSION_DOCKER),)
    SETUPTOOLS_SCM_PRETEND_VERSION_DOCKER = "0.0.0.dev0"
endif

.PHONY: shell integration-dind-ssh setup-network ruff unit-test build-dind-ssh docs integration-test integration-dind-ssl build build-dind-certs integration-dind clean all build-docs 

Breakdown of the Makefile

• Available functions: Lists the functions that can be invoked through the Makefile, like test.

• SETUPTOOLS_SCM_PRETEND_VERSION_DOCKER ?= …: This line determines the version of the application using git describe. If there is no version available, it defaults to 0.0.0.dev0.

• ifeq: Checks if the SETUPTOOLS_SCM_PRETEND_VERSION_DOCKER is empty and assigns the default version if true.

• .PHONY: Declares the listed targets as phony, ensuring that they will always run when invoked, regardless of whether a file with the same name exists.

Usage in Development

To utilize the Dockerfile and Makefile effectively in a development environment, follow these key steps:

1. Build the Docker Image

   Trigger the Docker build with the command:

   docker build -t your-image-name .
   

2. Run the Docker Container

   Start a container based on the built image:

   docker run -it --rm your-image-name
   

3. Test the Application

   You can execute the various Makefile functions to manage your development tasks:

   make test
   

4. Run Shell Access

   If you need shell access inside the container, use:

   make shell
   

5. Clean Up

   To remove any unused images or containers, run the clean task:

   make clean
   

This structured approach facilitates a smooth development workflow, leveraging the capabilities of Docker while streamlining the setup and execution processes.

The information provided here is based on the contents of the files “Dockerfile” and “Makefile”.