publish_images.py

#!/usr/bin/env python
from glob import glob
import subprocess as sp
import sys
import time

REGISTRY_URL = 'docker.km3net.de'


def get_changed_dockerfiles():
    """Checks the last Git commit and returns a list of changed Dockefiles"""
    diff_cmd = "git diff-tree --no-commit-id --name-only -r HEAD"
    child = sp.Popen(diff_cmd, shell=True, stdout=sp.PIPE, stderr=sp.PIPE)
    out, _ = child.communicate()

    changed_files = [l.decode().rstrip() for l in out.split(b'\n')]
    changed_dockerfiles = [f for f in changed_files if f.startswith("base/")]
    return changed_dockerfiles


def main():
    changed_dockerfiles = get_changed_dockerfiles()
    n_files = len(changed_dockerfiles)

    if n_files == 0:
        print("Nothing to do!")
        exit(0)

    print("Processing {} dockerfile{}...".format(n_files,
                                                 's' if n_files > 1 else ''))
    for idx, fname in enumerate(changed_dockerfiles):
        progress = "({}/{})".format(idx + 1, n_files)

        steps = [("Building",
                  "docker build --pull -t {0}/{1} -f {1} . ".format(
                      REGISTRY_URL, fname)),
                 ("Pushing", "docker push {0}/{1}".format(REGISTRY_URL,
                                                          fname))]

        print('-' * 79)

        for step, cmd in steps:
            print("{} {} '{}'".format(progress, step, fname))
            child = sp.Popen(
                cmd, shell=True, stdout=sys.stdout, stderr=sys.stderr)
            child.communicate()


if __name__ == '__main__':
    main()