def patch_dockerfile(dockerfile, images):
"""
Patch an existing Dockerfile to replace FROM image statements
by their local images with digests. It supports multi-stage images
This is needed to avoid retrieving remote images before checking current img state
Bug https://github.com/genuinetools/img/issues/206
"""
assert os.path.exists(dockerfile), "Missing dockerfile {}".format(
dockerfile)
assert isinstance(images, list)
if not images:
return
def _find_replacement(original):
# Replace an image name by its local version
# when it exists
repo, tag = parse_image_name(original)
for image in images:
if image["repository"] == repo and image["tag"] == tag:
if image["registry"]:
local = "{}/{}@sha256:{}".format(image["registry"],
image["repository"],
image["digest"])
else:
local = "{}@sha256:{}".format(image["repository"],
image["digest"])
logger.info("Replacing image {} by {}".format(original, local))
return local
return original
# Parse the given dockerfile and update its parent images
# with local version given by current img state
# The FROM statement parsing & replacement is provided
# by the DockerfileParser
parser = DockerfileParser()
parser.dockerfile_path = dockerfile
parser.content = open(dockerfile).read()
logger.info("Initial parent images: {}".format(" & ".join(
parser.parent_images)))
parser.parent_images = list(map(_find_replacement, parser.parent_images))
def get_image_base(self, image, tag):
abs_image_path = self.get_abs_image_dockerfile(image, tag)
doc = DockerfileParser()
doc.dockerfile_path = abs_image_path
return doc.baseimage
def get_image_base(self, image, tag):
abs_image_path = self.get_abs_image_dockerfile(image, tag)
doc = DockerfileParser()
doc.dockerfile_path = abs_image_path
return doc.baseimage
