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__init__.py
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__init__.py
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import json
import logging
import os
import subprocess
from typing import Any, Dict, List, Optional, Tuple, Union
from dockerpycreds.utils import find_executable # type: ignore
import requests
from wandb.docker import auth
from wandb.docker import www_authenticate
from wandb.errors import DockerError
entrypoint = os.path.join(
os.path.dirname(os.path.abspath(__file__)), "wandb-entrypoint.sh"
)
auth_config = auth.load_config()
log = logging.getLogger(__name__)
def shell(cmd: List[str]) -> Optional[str]:
"""Simple wrapper for calling docker,
returning None on error and the output on success"""
try:
return (
subprocess.check_output(["docker"] + cmd, stderr=subprocess.STDOUT)
.decode("utf8")
.strip()
)
except subprocess.CalledProcessError as e:
print(e)
return None
_buildx_installed = None
def is_buildx_installed() -> bool:
"""Returns `True` if docker buildx is installed and working."""
global _buildx_installed
if _buildx_installed is not None:
return _buildx_installed # type: ignore
if not find_executable("docker"):
_buildx_installed = False
else:
help_output = shell(["buildx", "--help"])
_buildx_installed = help_output is not None and "buildx" in help_output
return _buildx_installed
def build(tags: List[str], file: str, context_path: str) -> str:
command = ["buildx", "build"] if is_buildx_installed() else ["build"]
build_tags = []
for tag in tags:
build_tags += ["-t", tag]
run(
["docker"] + command + build_tags + ["-f", file, context_path],
capture_stderr=False,
capture_stdout=False,
)
return tags[0]
def run(
args: List[Any],
capture_stdout: bool = True,
capture_stderr: bool = True,
input: bytes = None,
return_stderr: bool = False,
env: Optional[Dict[str, str]] = None,
) -> Union[str, Tuple[str, str]]:
args = [str(x) for x in args]
subprocess_env = dict(os.environ)
subprocess_env.update(env or {})
if args[1] == "buildx":
subprocess_env["DOCKER_CLI_EXPERIMENTAL"] = "enabled"
stdout_dest: Optional[int] = subprocess.PIPE if capture_stdout else None
stderr_dest: Optional[int] = subprocess.PIPE if capture_stderr else None
completed_process = subprocess.run(
args, input=input, stdout=stdout_dest, stderr=stderr_dest, env=subprocess_env
)
if completed_process.returncode != 0:
raise DockerError(
args,
completed_process.returncode,
completed_process.stdout,
completed_process.stderr,
)
if return_stderr:
return (
_post_process_stream(completed_process.stdout),
_post_process_stream(completed_process.stderr),
)
else:
return _post_process_stream(completed_process.stdout)
def _post_process_stream(stream: Optional[bytes]) -> str:
if stream is None:
return ""
decoded_stream = stream.decode()
if len(decoded_stream) != 0 and decoded_stream[-1] == "\n":
decoded_stream = decoded_stream[:-1]
return decoded_stream
def default_image(gpu: bool = False) -> str:
tag = "all"
if not gpu:
tag += "-cpu"
return "wandb/deepo:%s" % tag
def parse_repository_tag(repo_name: str) -> Tuple[str, Optional[str]]:
parts = repo_name.rsplit("@", 1)
if len(parts) == 2:
return parts[0], parts[1]
parts = repo_name.rsplit(":", 1)
if len(parts) == 2 and "/" not in parts[1]:
return parts[0], parts[1]
return repo_name, None
def parse(image_name: str) -> Tuple[str, str, str]:
repository, tag = parse_repository_tag(image_name)
registry, repo_name = auth.resolve_repository_name(repository)
if registry == "docker.io":
registry = "index.docker.io"
return registry, repo_name, (tag or "latest")
def auth_token(registry: str, repo: str) -> Dict[str, str]:
"""Makes a request to the root of a v2 docker registry to get the auth url.
Always returns a dictionary, if there's no token key we couldn't authenticate
"""
# TODO: Cache tokens?
auth_info = auth_config.resolve_authconfig(registry)
if auth_info:
normalized = {k.lower(): v for k, v in auth_info.items()}
normalized_auth_info: Optional[Tuple[str, str]] = ( # type: ignore
normalized.get("username"),
normalized.get("password"),
)
else:
normalized_auth_info = None
response = requests.get(f"https://{registry}/v2/", timeout=3)
if response.headers.get("www-authenticate"):
try:
info: Dict = www_authenticate.parse(response.headers["www-authenticate"])
except ValueError:
info = {}
else:
log.error(
"Received {} when attempting to authenticate with {}".format(
response, registry
)
)
info = {}
if info.get("bearer"):
res = requests.get(
info["bearer"]["realm"]
+ "?service={}&scope=repository:{}:pull".format(
info["bearer"]["service"], repo
),
auth=normalized_auth_info,
timeout=3,
)
res.raise_for_status()
result_json: Dict[str, str] = res.json()
return result_json
return {}
def image_id_from_registry(image_name: str) -> Optional[str]:
"""Get the docker id from a public or private registry"""
registry, repository, tag = parse(image_name)
res = None
try:
token = auth_token(registry, repository).get("token")
# dockerhub is crazy
if registry == "index.docker.io":
registry = "registry-1.docker.io"
res = requests.head(
f"https://{registry}/v2/{repository}/manifests/{tag}",
headers={
"Authorization": f"Bearer {token}",
"Accept": "application/vnd.docker.distribution.manifest.v2+json",
},
timeout=5,
)
res.raise_for_status()
except requests.RequestException:
log.error(f"Received {res} when attempting to get digest for {image_name}")
return None
return "@".join([registry + "/" + repository, res.headers["Docker-Content-Digest"]])
def image_id(image_name: str) -> Optional[str]:
"""Retreve the image id from the local docker daemon or remote registry"""
if "@sha256:" in image_name:
return image_name
else:
digests = shell(["inspect", image_name, "--format", "{{json .RepoDigests}}"])
try:
if digests is None:
raise ValueError()
im_id: str = json.loads(digests)[0]
return im_id
except (ValueError, IndexError):
return image_id_from_registry(image_name)
def get_image_uid(image_name: str) -> int:
"""Retrieve the image default uid through brute force"""
image_uid = shell(["run", image_name, "id", "-u"])
return int(image_uid) if image_uid else -1
def push(image: str, tag: str) -> Optional[str]:
"""Push an image to a remote registry"""
return shell(["push", f"{image}:{tag}"])
def login(username: str, password: str, registry: str) -> Optional[str]:
"""Login to a registry"""
return shell(["login", "--username", username, "--password", password, registry])
def tag(image_name: str, tag: str) -> Optional[str]:
"""Tag an image"""
return shell(["tag", image_name, tag])
__all__ = [
"shell",
"build",
"run",
"image_id",
"image_id_from_registry",
"auth_token",
"parse",
"parse_repository_tag",
"default_image",
"get_image_uid",
"push",
"login",
"tag",
]