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build.py
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#!/usr/bin/env python3
"""Update script for dockerfiles."""
import os
import click
import logging
from datetime import date
from generate import templates
from generate import generate_dockerfiles as gen
TODAY = date.today()
USER = "althack"
log = logging.getLogger(__name__)
def should_push():
"""Set whether or not to push from environment variables.
Env:
push: $DOCKER_PUSH
"""
return os.getenv("DOCKER_PUSH")
def should_clean():
"""Set whether or not to clean images from environment variables.
Env:
push: $DOCKER_CLEAN
"""
return os.getenv("DOCKER_CLEAN")
class Docker(object):
"""Managed docker class to hide complexity with logging output."""
def __init__(self):
"""Initialize docker container from environment."""
def build(self, context, dockerfile, repository, tag, target, labels):
"""Build the specified container.
Args:
context: The path to the context
dockerfile: The relative path to the dockerfile from the context
repository: The name of the repository to build
tag: The tag for the build
target: The target to build in a multi-stage docker
labels: Extra label to add to the image
"""
build_tag = f"{repository}:{tag}"
log.info(f"Building {context}{dockerfile} {target} as {build_tag}")
dockerfile = os.path.join(context, dockerfile)
ret = os.system(
f"docker build "
f"--file {dockerfile} "
f"--target {target} "
f"--tag {build_tag} "
f"--pull {context}"
)
if ret != 0:
raise Exception("Error building docker image")
log.info(f"Done building {build_tag}")
def tag(self, repository, prev_tag, new_tag):
"""Tag a built image."""
image = f"{repository}:{prev_tag}"
log.info(f"Taging {image} --> {repository}:{new_tag}")
ret = os.system(f"docker tag {image} {repository}:{new_tag}")
if ret != 0:
raise Exception("Error tagging docker image")
def push(self, repository, tag):
"""Push a built repository:tag to a registry.
Format: repository:tag
Args:
repository: The name of the repository.
tag: The name of the tag.
"""
log.info(f"Pushing {repository}:{tag}")
ret = os.system(f"docker push {repository}:{tag}")
if ret != 0:
raise Exception("Error pushing docker image")
log.info(f"Done pushing {repository}:{tag}")
def prune(self):
"""Prune dangling images."""
ret = os.system("docker system prune -f")
if ret != 0:
raise Exception("Error pruning docker images")
def rmi(self, repository, tag):
"""Remove image by repository and tag."""
image = f"{repository}:{tag}"
ret = os.system(f"docker rmi {image}")
if ret != 0:
raise Exception("Error removing docker image")
def build(image, target, push, clean):
"""Build the docker images."""
builds = templates.images(eol=True)
if image != "all":
builds = {image: templates.images()[image]}
# Build docker images.
dockerpy = Docker()
path_to_script = os.path.dirname(os.path.abspath(__file__))
for name in builds:
folder = builds[name]["repository"]
repository = f"{USER}/{folder}"
targets = builds[name]["targets"] if not target else [target]
context = f"{path_to_script}/{folder}/"
dockerfile = f"{name}.Dockerfile"
labels = {"version": f"{TODAY}"}
for target in targets:
latest_tag = f"{name}-{target}"
dated_tag = f"{latest_tag}-{TODAY}"
dockerpy.build(
context=context,
dockerfile=dockerfile,
repository=repository,
tag=latest_tag,
target=target,
labels=labels,
)
dockerpy.tag(
repository=repository, prev_tag=latest_tag, new_tag=dated_tag
)
if push or should_push():
dockerpy.push(repository=repository, tag=latest_tag)
dockerpy.push(repository=repository, tag=dated_tag)
if clean or should_clean():
dockerpy.rmi(repository=repository, tag=dated_tag)
dockerpy.prune()
@click.command()
@click.option(
"--generate/--no-generate", default=True, help="Generate docker files."
)
@click.option(
"--push/--no-push",
default=False,
help="Push generated images to DockerHub.",
)
@click.option(
"--clean/--no-clean",
default=True,
help="Clean dated content and old images.",
)
@click.option("--target", default="", help="The target to build")
@click.argument("image", type=click.Choice(list(templates.images()) + ["all"]))
def main(generate, push, clean, image, target):
"""Set up logging and trigger build."""
log.setLevel(logging.DEBUG)
formatter = logging.Formatter("%(message)s")
ch = logging.StreamHandler()
ch.setLevel(logging.DEBUG)
ch.setFormatter(formatter)
log.addHandler(ch)
if generate:
gen(log)
build(image, target, push, clean)
if __name__ == "__main__":
# pylint: disable=no-value-for-parameter
main()