173 lines
4.7 KiB
Python
Executable File
173 lines
4.7 KiB
Python
Executable File
"""
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Platydock is a helper script that allows you to automatically create a
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Dockerfile for Platypush starting from a configuration file.
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"""
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import argparse
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from enum import Enum
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import inspect
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import os
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import pathlib
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import sys
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from typing import Iterable
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from platypush.config import Config
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from platypush.utils.manifest import Dependencies, InstallContext, PackageManagers
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class BaseImage(Enum):
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"""
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Supported base images for Dockerfiles.
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"""
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ALPINE = 'alpine'
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DEBIAN = 'debian'
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UBUNTU = 'ubuntu'
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def __str__(self) -> str:
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"""
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Explicit __str__ override for argparse purposes.
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"""
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return self.value
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# pylint: disable=too-few-public-methods
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class DockerfileGenerator:
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"""
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Generate a Dockerfile from on a configuration file.
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:param cfgfile: Path to the configuration file.
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:param image: The base image to use.
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"""
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_pkg_manager_by_base_image = {
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BaseImage.ALPINE: PackageManagers.APK,
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BaseImage.DEBIAN: PackageManagers.APT,
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BaseImage.UBUNTU: PackageManagers.APT,
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}
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def __init__(self, cfgfile: str, image: BaseImage) -> None:
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self.cfgfile = os.path.abspath(os.path.expanduser(cfgfile))
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self.image = image
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def generate(self) -> str:
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"""
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Generate a Dockerfile based on a configuration file.
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:param cfgfile: Path to the configuration file.
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:return: The content of the generated Dockerfile.
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"""
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import platypush
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Config.init(self.cfgfile)
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new_file_lines = []
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ports = self._get_exposed_ports()
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pkg_manager = self._pkg_manager_by_base_image[self.image]
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deps = Dependencies.from_config(
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self.cfgfile,
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pkg_manager=pkg_manager,
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install_context=InstallContext.DOCKER,
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)
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is_after_expose_cmd = False
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base_file = os.path.join(
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str(pathlib.Path(inspect.getfile(platypush)).parent),
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'install',
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'docker',
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f'{self.image}.Dockerfile',
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)
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with open(base_file, 'r') as f:
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file_lines = [line.rstrip() for line in f.readlines()]
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for line in file_lines:
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if line.startswith('RUN cd /install '):
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for new_line in deps.before:
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new_file_lines.append('RUN ' + new_line)
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for new_line in deps.to_pkg_install_commands():
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new_file_lines.append('RUN ' + new_line)
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elif line == 'RUN rm -rf /install':
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for new_line in deps.to_pip_install_commands():
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new_file_lines.append('RUN ' + new_line)
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for new_line in deps.after:
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new_file_lines.append('RUN' + new_line)
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elif line.startswith('EXPOSE ') and ports:
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if not is_after_expose_cmd:
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new_file_lines.extend([f'EXPOSE {port}' for port in ports])
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is_after_expose_cmd = True
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continue
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new_file_lines.append(line)
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return '\n'.join(new_file_lines)
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@staticmethod
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def _get_exposed_ports() -> Iterable[int]:
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"""
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:return: The listen ports used by the backends enabled in the configuration
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file.
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"""
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backends_config = Config.get_backends()
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return {
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int(port)
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for port in (
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backends_config.get('http', {}).get('port'),
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backends_config.get('tcp', {}).get('port'),
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)
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if port
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}
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def main():
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"""
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Generates a Dockerfile based on the configuration file.
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"""
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parser = argparse.ArgumentParser(
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prog='platydock',
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add_help=False,
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description='Create a Platypush Dockerfile from a config.yaml.',
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)
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parser.add_argument(
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'-h', '--help', dest='show_usage', action='store_true', help='Show usage'
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)
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parser.add_argument(
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'cfgfile', type=str, nargs='?', help='The path to the configuration file.'
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)
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parser.add_argument(
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'--image',
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'-i',
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dest='image',
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required=False,
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type=BaseImage,
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choices=list(BaseImage),
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default=BaseImage.ALPINE,
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help='Base image to use for the Dockerfile.',
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)
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opts, _ = parser.parse_known_args(sys.argv[1:])
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if opts.show_usage:
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parser.print_help()
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return 0
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if not opts.cfgfile:
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print(
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f'Please specify a configuration file.\nRun {sys.argv[0]} --help to get the available options.',
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file=sys.stderr,
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)
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return 1
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dockerfile = DockerfileGenerator(opts.cfgfile, image=opts.image).generate()
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print(dockerfile)
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return 0
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if __name__ == '__main__':
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sys.exit(main())
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# vim:sw=4:ts=4:et:
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